- ver. 3.50c

[packages/povray.git] / povray-pvm.patch

diff -Naur source.ori/optin.c source/optin.c
--- source.ori/optin.c	Sat Jun 30 01:49:21 2001
+++ source/optin.c	Sat Jun 30 10:01:28 2001
@@ -30,7 +30,8 @@
 *
 *  Written by CEY 4/94 based on existing code and INI code from CDW.
 *
-*  ---
+*  Modified Oct. 96 by Deischi for PVM
+*  Modified Jun 2001 by Agaran for conditional PVM build
 *
 * Modification by Thomas Willhalm, March 1999, used with permission.
 *
@@ -56,7 +57,9 @@
 #include "targa.h"
 #include "userio.h"
 #include "png_pov.h"
-
+#ifdef USE_PVM
+#include "pvm.h"
+#endif
 
 
 /*****************************************************************************
@@ -187,7 +190,23 @@
 
   { BITS_PER_COLOR_OP, "Bits_Per_Color" },
   { BITS_PER_COLOUR_OP, "Bits_Per_Colour" },
+#ifdef USE_PVM
+ { INCLUDE_INI_OP, "Include_Ini" },
+
+ /* new options for PVM-Pov */
+ { PVM_TASKS_OP, "PVM_Tasks" },
+ { PVM_WIDTH_OP, "PVM_Width" },
+ { PVM_HEIGHT_OP, "PVM_Height" },
+ { PVM_SLAVE_OP, "PVM_Slave" },
+ { PVM_ARCH_OP, "PVM_Arch" },
+ { PVM_NICE_OP, "PVM_Nice" },
+ { PVM_WD_OP, "PVM_WD" },
+ { PVM_HOSTS_OP, "PVM_Hosts" },
+ { PVM_USE_OP, "PVM" }
+
+#else
   { INCLUDE_INI_OP, "Include_Ini" }
+#endif
 };
 
 static char temp_string[3]="\0\0";
@@ -229,7 +248,8 @@
 *
 * CHANGES
 *
-*   -
+*   Oct. 1996: Added options for PVMPOV [Deischi]
+*   jun 2001: conditional pvm
 *
 ******************************************************************************/
 
@@ -560,6 +580,44 @@
     case INCLUDE_INI_OP:
       value[0] = '\0';
       return value;
+#ifdef USE_PVM
+     /*
+      * PVM Options
+      */
+    case PVM_TASKS_OP:
+        sprintf(value, "%d", PvmTasks);
+        return value;
+    case PVM_WIDTH_OP:
+        sprintf(value, "%d", PvmChunkWidth);
+        return value;
+    case PVM_HEIGHT_OP:
+        sprintf(value, "%d", PvmChunkHeight);
+        return value;
+    case PVM_SLAVE_OP:
+        strncpy(value, PvmSlavename ? PvmSlavename : "", 128);
+        return value;
+    case PVM_ARCH_OP:
+        sprintf(value, "%s", PvmArch);
+        return value;
+    case PVM_NICE_OP:
+        sprintf(value, "%d", PvmNice);
+        return value;
+    case PVM_WD_OP:
+        strncpy(value, PvmWorkingDir, PATH_MAX);
+        return value;
+    case PVM_HOSTS_OP:
+        if(PvmHosts) {
+ 	   int i;
+ 	   for(i=0; i < PvmHostsN; i++) {
+ 	       strncat(value, PvmHosts[i], 128);
+ 	       strncat(value, ",", 128);
+ 	   }
+        }
+        return value;
+    case PVM_USE_OP:
+        sprintf(value, "%s", (PvmTasks || PvmSlave) ? "On" : "Off");
+        return value;
+#endif
 
     default:
       Error("Unknown INI option in Write_INI.");
@@ -602,6 +660,8 @@
 *   Sep 1994 : Added options for union splitting, vista/light buffer. [DB]
 *   Jan 1995 : Added options for histogram grid. [CJC]
 *   Feb 1995 : Added options for console/file redirection and .INI writing [SCD]
+*   Oct 1996 : Added options for PVMPOV [Deischi]
+*   jun 2001 : added condititional build for pvm
 *
 ******************************************************************************/
 
@@ -1024,13 +1084,67 @@
       break;
 
     /*  "N" option flag is used by networking (multi-processor) options.
-
-    case 'N':
-    case 'n':
-
-      break;
-
      */
+#ifdef USE_PVM
+       /* 
+        * PVM-POV 
+        *
+        */
+   case 'N': /* switches used for PVMPOV */
+   case 'n':
+       switch( Option_String[1]) {
+       case '\0':	/* Start one slave/available PVM host */
+ 	  process_variable(PVM_USE_OP, Add_Option ? "On" : "Off");
+ 	  break;
+       case 'a': /* Select a particular architecture to run the slaves on */
+       case 'A':
+ 	  process_variable(PVM_ARCH_OP, Option_String+2);
+ 	  break;
+       case 'n': /* Sets the niceness (priority) level */
+       case 'N':
+ 	  process_variable(PVM_NICE_OP, Option_String+2);
+ 	  break;
+       case 't': /* Sets the number of tasks to run.  Default is 1 per host */
+       case 'T':
+ 	  process_variable(PVM_TASKS_OP, Option_String+2);
+ 	  break;
+       case 'h': /* The height of a single grid block, in pixels */
+       case 'H':
+ 	  process_variable(PVM_HEIGHT_OP, Option_String+2);
+ 	  break;
+       case 'w': /* The width of a single grid block, in pixels */
+       case 'W':
+ 	  process_variable(PVM_WIDTH_OP, Option_String+2);
+ 	  break;	  
+       case 's': /* specify the name of the slave */
+       case 'S':
+ 	  process_variable(PVM_SLAVE_OP, Option_String+2);
+ 	  break;
+       case 'd': /* specify working directory for the slaves */
+       case 'D':
+	   process_variable(PVM_WD_OP, Option_String+2);
+	   break;
+ 	  /* Internal sub-option "-nI" indicates a PVM slave task.
+ 	   * This will be appended to current argv string, so it will override
+ 	   * the previous -nxx options. */
+       case 'i':
+       case 'I':
+ 	  PvmTasks = 1;
+ 	  PvmSlave = 1;
+ 	  
+ 	  if (chdir(&Option_String[2]) < 0) {
+ 	      fprintf(stderr, "Slave cannot cd to %s.\n", &Option_String[2]);
+ 	      exit(1);
+ 	  }
+ 	  break;
+ 	  
+       default:
+ 	  fprintf(stderr, "Illegal +N%c switch setting\n", Option_String[1]);
+ 	  break;
+       } /* switch */
+       break;
+#endif
+     
 
     case 'O':
     case 'o':
@@ -1262,7 +1376,8 @@
 *
 * CHANGES
 *
-*   -
+*   Oct 1996 : Added options for PVMPOV [Deischi]
+*   jun 2001 : conditional build for pvm
 *
 ******************************************************************************/
 
@@ -1445,21 +1560,36 @@
       return;
 
     case END_COLUMN_OP:
+#ifdef USE_PVM
+       /* tw */
+      if (sscanf (value, DBL_FORMAT_STRING, &floatval) != SCANF_EOF) {
+#else
       { /* tw */
       if (sscanf (value, DBL_FORMAT_STRING, &floatval) != SCANF_EOF)
+#endif
         if(floatval > 0.0 && floatval <= 1.0)
         {
           opts.Last_Column = -1;
           opts.Last_Column_Percent = floatval;
         }
+#ifdef USE_PVM
+        else {
+	  opts.Last_Column = (int) floatval; }
+#else
         else
           opts.Last_Column = (int) floatval;
+#endif
       } /* tw */
       return;
 
     case END_ROW_OP:
+#ifdef USE_PVM
+       /* tw */
+      if (sscanf (value, DBL_FORMAT_STRING, &floatval) != SCANF_EOF) {
+#else
       { /* tw */ 
       if (sscanf (value, DBL_FORMAT_STRING, &floatval) != SCANF_EOF)
+#endif
         if(floatval > 0.0 && floatval <= 1.0)
         {
           opts.Last_Line = -1;
@@ -1831,6 +1961,86 @@
         Error ("Could not open Include_Ini='%s'.\n", value);
       }
       return;
+
+#ifdef USE_PVM
+      /* 
+       * Options for PVMPOV
+       */
+   case PVM_TASKS_OP:
+       if (sscanf(value, "%d", &PvmTasks) != 1 || PvmTasks < 1) { 
+ 	  PvmTasks = 9999;   /* Try to start one slave/available PVM host */
+       } 
+       return;
+ 
+   case PVM_WIDTH_OP:
+       if (sscanf(value, "%d", &PvmChunkWidth) != 1 || PvmChunkWidth < 4)
+ 	  PvmChunkWidth = PVM_DEFAULT_GRID_WIDTH;
+       return;
+ 
+   case PVM_HEIGHT_OP:
+       if (sscanf(value, "%d", &PvmChunkHeight) != 1 || PvmChunkHeight < 4)
+ 	  PvmChunkHeight = PVM_DEFAULT_GRID_HEIGHT;
+       return;
+ 	  
+   case PVM_SLAVE_OP:
+       PvmSlavename = POV_MALLOC( sizeof(char)*(strlen(value)+1), 
+ 				 "PVM Slavename");
+       strcpy(PvmSlavename, value);
+       return;
+ 	  
+   case PVM_ARCH_OP:
+       strncpy(PvmArch,value,19);
+       PvmArch[19] = '\0';
+ 	  
+       if (PvmTasks < 1)
+ 	  PvmTasks = 9999;   /* Try to start one slave/available PVM host */
+       return;
+ 
+   case PVM_NICE_OP:
+       if (sscanf(value, "%d", &PvmNice) != 1 || PvmNice < 0) {
+ 	  PvmNice = PVM_DEFAULT_NICE;
+       }
+       return;
+
+   case PVM_WD_OP:
+       strncpy(PvmWorkingDir, value, PATH_MAX);
+       return;
+
+   case PVM_HOSTS_OP: {
+       char * c = value;
+       char * c2;
+       int n;
+
+       PvmHostsN = 1;			/* count number of names */
+       while((c = strchr(c, ',')) != NULL) {
+	   c ++;
+	   PvmHostsN ++;
+       }
+       PvmHosts = (char**)POV_MALLOC( sizeof(char*) * PvmHostsN, "PvmHosts");
+
+       c = value;
+       c2 = strchr(c,',');
+       for(i=0; i < PvmHostsN; i++) {
+	   n = (c2) ? c2 - c : strlen(c);
+	   PvmHosts[i] = (char*)POV_MALLOC( sizeof(char) * (n + 1), "PvmHosts[i]");
+	   strncpy(PvmHosts[i], c, n);
+	   PvmHosts[i][n] = '\0';
+
+	   if(c2) c = c2 + 1;
+	   c2 = strchr(c, ',');
+       }
+
+       PvmTasks = PvmHostsN;
+
+       return;
+
+   }
+   case PVM_USE_OP:
+       PvmTasks = istrue(value) ? 9999 : 0;
+       return;
+
+#endif 
+
 
     default:
       Warning(0.0,"Unimplemented INI '%s'.\n",Option_Variable[variable].Token_Name);
diff -Naur source.ori/optin.h source/optin.h
--- source.ori/optin.h	Sat Jun 30 01:49:21 2001
+++ source/optin.h	Sat Jun 30 03:43:53 2001
@@ -19,6 +19,10 @@
 * DKBTrace was originally written by David K. Buck.
 * DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
 *
+*
+* Oct 1996 : Added options for PVMPOV [Deischi]
+* Jun 2001 : Added conditional build for PVM Support [Agaran]
+*
 *****************************************************************************/
 
 
@@ -131,6 +135,19 @@
   BITS_PER_COLOR_OP,
   BITS_PER_COLOUR_OP,
   INCLUDE_INI_OP,
+
+#ifdef USE_PVM
+  /* new options for PVMPOV */
+  PVM_TASKS_OP,
+  PVM_WIDTH_OP,
+  PVM_HEIGHT_OP,
+  PVM_SLAVE_OP,
+  PVM_ARCH_OP,
+  PVM_NICE_OP,
+  PVM_WD_OP,
+  PVM_HOSTS_OP,
+  PVM_USE_OP,
+#endif
 
   MAX_OPTION
 } INI_OP;
diff -Naur source.ori/optout.c source/optout.c
--- source.ori/optout.c	Sat Jun 30 01:49:21 2001
+++ source/optout.c	Sat Jun 30 09:25:02 2001
@@ -19,6 +19,9 @@
 * DKBTrace was originally written by David K. Buck.
 * DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
 *
+* Oct 1996 : Added options for PVMPOV [Deischi]
+* jun 2001 : added conditional build for pvm
+*
 *****************************************************************************/
 
 #include <ctype.h>
@@ -65,8 +68,9 @@
 #include "povray.h"
 #include "optin.h"
 #include "optout.h"
-
-
+#ifdef USE_PVM
+#include "pvm.h"
+#endif
 
 /*****************************************************************************
 * Local preprocessor defines
@@ -611,6 +615,9 @@
 *   Dec 1994 : Changed to show options depending on parameter n. [DB]
 *
 *   Feb 1995 : Changed to terminate only if f != 0. [DB]
+*   
+*   Oct 1996 : Added options from PVMPOV [Deischi]
+*   Jun 2001 : conditional build for pvm
 *
 ******************************************************************************/
 
@@ -640,7 +647,12 @@
       Banner("    4     Output Options - file related\n");
       Banner("    5     Tracing Options\n");
       Banner("    6     Animation Options\n");
+#ifdef USE_PVM
+      Banner("    7     PVM Options\n");
+      Banner("    8     Redirecting Options\n");
+#else
       Banner("    7     Redirecting Options\n");
+#endif
 
       break;
 
@@ -767,6 +779,40 @@
 
       break;
 
+#ifdef USE_PVM
+    /* PVM options. */
+
+    case 7:
+
+      Banner("\n");
+      Banner("PVM options\n");
+      Banner("\n");
+      Banner("  N         = Turn on PVM\n");
+      Banner("  NTnnn     = Spawn number of tasks\n");
+      Banner("  NAs       = Spawn only on architecture\n");
+      Banner("  NWnnn     = Width of each chunk\n");
+      Banner("  NHnnn     = Height of each chunk\n");
+      Banner("  NNnnn     = Niceness of slaves\n");
+      Banner("  NSs       = Name of slaves (executable)\n");
+      Banner("  NDnnn     = Name of the working directory\n");
+      Banner("  pvm_hosts = n,n,..  = List of hostnames to use\n");
+      Banner("\n");
+
+    /* Redirecting options. */
+
+      Banner("\n");
+      Banner("Redirecting options\n");
+      Banner("\n");
+      Banner("  GI<name>= write all .INI parameters to file name\n");
+      Banner("  Gx<name>= write stream x to console and/or file name\n");
+      Banner("            GA - All streams (except status)\n");
+      Banner("            GD - Debug stream\n");
+      Banner("            GF - Fatal stream\n");
+      Banner("            GR - Render stream\n");
+      Banner("            GS - Statistics stream\n");
+      Banner("            GW - Warning stream\n");
+#else 
+
     /* Redirecting options. */
 
     case 7:
@@ -782,6 +828,7 @@
       Banner("            GR - Render stream\n");
       Banner("            GS - Statistics stream\n");
       Banner("            GW - Warning stream\n");
+#endif
 
       break;
 
@@ -867,7 +914,8 @@
 *
 * CHANGES
 *
-*   -
+*   Oct 1996 : Added options from PVMPOV [Deischi]
+*   Jun 2001 : Added conditional build for PVM Support [Agaran]
 *
 ******************************************************************************/
 
@@ -1089,6 +1137,26 @@
   }
 
   Render_Info("\n");
+#if USE_PVM
+  if(PvmTasks) {
+      int i;
+      Render_Info("PVM Options\n");
+      Render_Info("  Block Width....%8d", PvmChunkWidth);
+      Render_Info("  Block Height...%8d\n", PvmChunkHeight);
+      Render_Info("  PVM Tasks......%8d\n", PvmTasks);
+      Render_Info("  PVM Nice.......%8d\n", PvmNice);
+      Render_Info("  PVM Arch....... %s\n", PvmArch);
+      Render_Info("  PVM Slave...... %s\n", PvmSlavename ? PvmSlavename : "");
+      Render_Info("  PVM WorkingDir. %s\n", PvmWorkingDir);
+      if(PvmHosts) {
+        Render_Info("  Pvm Hosts......");
+        for(i=0; i < PvmHostsN; i++) {
+            Render_Info(" %s", PvmHosts[i]);
+        }
+        Render_Info("\n");
+      }
+  }
+#endif
 
   /* Print redirecting options. */
 
diff -Naur source.ori/optout.h source/optout.h
--- source.ori/optout.h	Sat Jun 30 01:49:21 2001
+++ source/optout.h	Sat Jun 30 02:17:45 2001
@@ -19,6 +19,10 @@
 * DKBTrace was originally written by David K. Buck.
 * DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
 *
+* Oct 1996 : Added options for PVMPOV [Deischi]
+* May 1999 : Changed code to work with POVRAY 3.1e [Flierl]
+* Jun 2001 : conditional build for PVM [agaran]
+*
 *****************************************************************************/
 
 
@@ -36,12 +40,19 @@
 #define POV_RAY_VERSION "3.1g"
 
 #define DISTRIBUTION_MESSAGE_1 "This is an unofficial version compiled by:"
+#ifdef USE_PVM
+#define DISTRIBUTION_MESSAGE_2 "Jakob Flierl <flierl@luga.de> - PVMPOV Version 3.1e.2"
+#else
 #define DISTRIBUTION_MESSAGE_2 "FILL IN NAME HERE........................."
+#endif
 #define DISTRIBUTION_MESSAGE_3 "The POV-Ray Team(tm) is not responsible for supporting this version."
 
 /* Number of help pages (numbered 0 to MAX_HELP_PAGE). */
-
+#ifdef USE_PVM
+#define MAX_HELP_PAGE 8
+#else
 #define MAX_HELP_PAGE 7
+#endif
 
 
 
diff -Naur source.ori/povray.c source/povray.c
--- source.ori/povray.c	Sat Jun 30 01:49:21 2001
+++ source/povray.c	Sat Jun 30 09:55:32 2001
@@ -20,6 +20,10 @@
 * DKBTrace was originally written by David K. Buck.
 * DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
 *
+* Oct 1996 : Added options for PVMPOV [Deischi]
+* May 1999 : Changed code to work with POVRAY 3.1e [Flierl]
+* Jun 2001 : Added conditional build for PVM [Agaran]
+*
 *****************************************************************************/
 
 #include <ctype.h>
@@ -69,7 +73,9 @@
 #include "userio.h"     /*Error,Warning,Init_Text_Streams*/
 #include "lbuffer.h"
 #include "vbuffer.h"
-
+#ifdef USE_PVM
+#include "pvm.h"
+#endif
 
 /*****************************************************************************
 * Local preprocessor defines
@@ -157,9 +163,15 @@
 static void fix_up_rendering_window (void);
 static void fix_up_animation_values (void);
 static void fix_up_scene_name (void);
+#ifdef USE_PVM
+void set_output_file_handle (void);
+void setup_output_file_name (void);
+void open_output_file (void);
+#else
 static void set_output_file_handle (void);
 static void setup_output_file_name (void);
 static void open_output_file (void);
+#endif
 static void FrameRender (void);
 static void init_statistics (COUNTER *);
 static void sum_statistics (COUNTER *, COUNTER *);
@@ -192,7 +204,8 @@
 *
 * CHANGES
 *
-*   -
+*   Oct 1996 : Added PVM Support [Deischi]
+*   Jun 2001 : Added conditional build for PVM Support [Agaran]
 *
 ******************************************************************************/
 
@@ -262,17 +275,31 @@
   }
 #endif
 
+#ifdef USE_PVM
+  /* If slave, turn off certain optiongs */
+  if ( PvmSlave)
+      opts.Options &= ~(DISPLAY | VERBOSE);
+#endif
+
   /* Strip path and extension off input name to create scene name */
   fix_up_scene_name ();
   
   /* Redirect text streams [SCD 2/95] */
   Open_Text_Streams();
 
+#ifdef USE_PVM
+  if ( !PvmSlave) {
+      /* Write .INI file [SCD 2/95] */
+      Write_INI_File();
+
+      ALT_WRITE_INI_FILE
+  }
+#else
   /* Write .INI file [SCD 2/95] */
   Write_INI_File();
   
   ALT_WRITE_INI_FILE
-
+#endif
   /* Make sure clock is okay, validate animation parameters */
   fix_up_animation_values();
 
@@ -282,9 +309,18 @@
   /* Set output file handle for options screen. */
   set_output_file_handle();
 
+#ifdef USE_PVM
+  /* Initialize PVM master */
+  if ( !PvmSlave && PvmTasks)
+      Pvm_Master_Init(argc, argv);
+
+  /* Print options used. */
+  if ( !PvmSlave)
+      Print_Options();
+#else
   /* Print options used. */
   Print_Options();
-  
+#endif
   /* BEGIN SECTION */
   /* VARIOUS INITIALIZATION THAT ONLY NEEDS TO BE DONE 1/EXECUTION */
 
@@ -306,6 +342,32 @@
 
   /* END SECTION */
 
+#ifdef USE_PVM
+  /* PVM Slave */
+  if (PvmSlave ) {
+      if( Pvm_Slave_Init() < 0)
+        return;
+
+      Pvm_Slave_Control();            /* get the first block to do */
+      while(PvmNextFrame <= opts.FrameSeq.FinalFrame) {
+        /* set frame number */
+        opts.FrameSeq.FrameNumber = PvmNextFrame;
+        /* calculate clock value */
+        opts.FrameSeq.Clock_Value = opts.FrameSeq.InitialClock +
+            ((DBL)(opts.FrameSeq.FrameNumber - opts.FrameSeq.InitialFrame)) *
+            Clock_Delta;
+
+        FrameRender();
+      }
+
+      Pvm_Slave_Exit();
+
+      Terminate_POV(0);
+
+      MAIN_RETURN_STATEMENT
+  }
+#endif
+
   /* Execute the first shell-out command */
   Pre_Scene_Result=(POV_SHELLOUT_CAST)POV_SHELLOUT(PRE_SCENE_SHL);
 
@@ -314,6 +376,26 @@
   if (Pre_Scene_Result != ALL_SKIP_RET)
   {
      if (Pre_Scene_Result != SKIP_ONCE_RET)
+#ifdef USE_PVM
+       if(!PvmSlave && PvmTasks) {
+           START_TIME
+           Pvm_Master_Control();     /* distribute work,
+                                        and collect results,
+                                        call shellout commands */
+           STOP_TIME
+           trender = TIME_ELAPSED
+
+           PRINT_STATS(totalstats);
+       } else {
+         for (opts.FrameSeq.FrameNumber = opts.FrameSeq.InitialFrame,
+              opts.FrameSeq.Clock_Value = opts.FrameSeq.InitialClock;
+
+              opts.FrameSeq.FrameNumber <= opts.FrameSeq.FinalFrame;
+
+              opts.FrameSeq.FrameNumber++,
+              opts.FrameSeq.Clock_Value += Clock_Delta)
+       {
+#else
      {
        for (opts.FrameSeq.FrameNumber = opts.FrameSeq.InitialFrame,
             opts.FrameSeq.Clock_Value = opts.FrameSeq.InitialClock;
@@ -323,6 +405,7 @@
             opts.FrameSeq.FrameNumber++,
             opts.FrameSeq.Clock_Value += Clock_Delta)
        {
+#endif
          setup_output_file_name();
 
          /* Execute a shell-out command before tracing */
@@ -348,7 +431,6 @@
            }
          }
        }
-
        /* Print total stats ... */
  
        if(opts.FrameSeq.FrameType==FT_MULTIPLE_FRAME)
@@ -399,6 +481,8 @@
 * CHANGES
 *
 *   Feb 1996: Make sure we are displaying when doing a mosaic preview [AED]
+*   Oct 1996: Added PVM support [Deischi]
+*   Jun 2001: Added conditional build for PVM Support [agaran]
 *
 ******************************************************************************/
 
@@ -483,6 +567,30 @@
   /* Save variable values. */
   variable_store(STORE);
 
+#ifdef USE_PVM
+  if( !PvmSlave) {
+
+  /* Open output file and if we are continuing an interrupted trace,
+   * read in the previous file settings and any data there.  This has to
+   * be done before any image-size related allocations, since the settings
+   * in a resumed file take precedence over that specified by the user. [AED]
+   */
+    open_output_file();
+
+    /* Start the display. */
+    if (opts.Options & DISPLAY)
+    {
+      Status_Info ("\nDisplaying...");
+
+      POV_DISPLAY_INIT(Frame.Screen_Width, Frame.Screen_Height);
+
+      Display_Started = TRUE;
+
+      /* Display vista tree. */
+      Draw_Vista_Buffer();
+    }
+  } /* !PvmTasks */
+#else
   /* Open output file and if we are continuing an interrupted trace,
    * read in the previous file settings and any data there.  This has to
    * be done before any image-size related allocations, since the settings
@@ -502,15 +610,45 @@
     /* Display vista tree. */
     Draw_Vista_Buffer();
   }
-
+#endif
   /* Get things ready for ray tracing (misc init, mem alloc) */
   Initialize_Renderer();
+#ifdef USE_PVM
+  /* If a PVM slave, re-assign Write_Line to PVM */
+  if (PvmSlave) {
+      Output_File_Handle->Write_Line_p = Pvm_Write_Line;
+  }
+#endif
 
   /* This had to be taken out of open_output_file() because we don't have
    * the final image size until the output file has been opened, so we can't
    * initialize the display until we know this, which in turn means we can't
    * read the rendered part before the display is initialized. [AED]
    */
+#ifdef USE_PVM
+  if (!PvmSlave) {
+    if ((opts.Options & DISKWRITE) && (opts.Options & CONTINUE_TRACE))
+    {
+      Read_Rendered_Part(Actual_Output_Name);
+
+      if (opts.Last_Line > Frame.Screen_Height)
+        opts.Last_Line = Frame.Screen_Height;
+
+      if (opts.Last_Column > Frame.Screen_Width)
+        opts.Last_Column = Frame.Screen_Width;
+    }
+  } /* !PvmSlave */
+  if(PvmSlave || !PvmTasks) {
+    /* Get parsing time. */
+    STOP_TIME
+    tparse = TIME_ELAPSED
+
+    /* Get total parsing time. */
+    tparse_total += tparse;
+
+  } /* PvmSlave || !PvmTasks */
+
+#else
   if ((opts.Options & DISKWRITE) && (opts.Options & CONTINUE_TRACE))
   {
     Read_Rendered_Part(Actual_Output_Name);
@@ -529,7 +667,7 @@
 
   /* Get total parsing time. */
   tparse_total += tparse;
-
+#endif
   /* Store start time for trace. */
   START_TIME
 
@@ -547,7 +685,65 @@
   POV_PRE_RENDER
 
   Status_Info ("\nRendering...\r");
+#ifdef USE_PVM
+  do {
 
+    /* Macro for setting up any special FP options */
+    CONFIG_MATH
+
+    /* Ok, go for it - trace the picture. */
+
+    /* If radiosity preview has been done, we are continuing a trace, so it
+     * is important NOT to do the preview, even if the user requests it, as it
+     * will cause discontinuities in radiosity shading by (probably) calculating
+     * a few more radiosity values.
+     */
+    if ( !opts.Radiosity_Preview_Done )
+    {
+      if ( opts.Options & RADIOSITY )
+      {
+        /* Note that radiosity REQUIRES a mosaic preview prior to main scan */
+
+        Start_Tracing_Mosaic_Smooth(opts.PreviewGridSize_Start, opts.PreviewGridSize_End);
+      }
+      else
+      {
+        if (opts.Options & PREVIEW && opts.Options & DISPLAY)
+        {
+          Start_Tracing_Mosaic_Preview(opts.PreviewGridSize_Start, opts.PreviewGridSize_End);
+        }
+      }
+    }
+
+    switch (opts.Tracing_Method)
+    {
+      case 2 :
+
+        Start_Adaptive_Tracing();
+
+        break;
+
+      case 1 :
+      default:
+
+        Start_Non_Adaptive_Tracing();
+    }
+  } while(PvmSlave ? Pvm_Slave_Control() : 0);        /* ask for more work */
+
+  /* We're done. */
+
+  /* Record time so well spent before file close so it can be in comments  */
+  STOP_TIME
+  trender = TIME_ELAPSED
+
+  if(!PvmSlave) {
+      /* Close out our file */
+      if (Output_File_Handle)
+      {
+        Close_File(Output_File_Handle);
+      }
+  }
+#else
   /* Macro for setting up any special FP options */
   CONFIG_MATH
 
@@ -600,7 +796,7 @@
   {
      Close_File(Output_File_Handle);
   }
-
+#endif
   Stage = STAGE_SHUTDOWN;
 
   POV_PRE_SHUTDOWN
@@ -626,6 +822,27 @@
   /* Get total render time. */
   trender_total += trender;
 
+#ifdef USE_PVM
+  if(!PvmSlave) {
+    POV_DISPLAY_FINISHED
+
+    if ((opts.Options & DISPLAY) && Display_Started)
+    {
+      POV_DISPLAY_CLOSE
+
+      Display_Started = FALSE;
+    }
+
+    if (opts.histogram_on)
+      write_histogram (opts.Histogram_File_Name) ;
+  }
+  Status_Info("\nDone Tracing");
+
+  /* Print stats ... */
+  if(!PvmSlave)
+    PRINT_STATS(stats);
+
+#else
   POV_DISPLAY_FINISHED
 
   if ((opts.Options & DISPLAY) && Display_Started)
@@ -642,7 +859,7 @@
 
   /* Print stats ... */
   PRINT_STATS(stats);
-
+#endif
   if(opts.FrameSeq.FrameType==FT_MULTIPLE_FRAME)
   {
     /* Add them up */
@@ -1030,8 +1247,11 @@
 *          NULL function pointer.
 *
 ******************************************************************************/
-
+#ifdef USE_PVM
+void set_output_file_handle()
+#else
 static void set_output_file_handle()
+#endif
 {
   char *def_ext = NULL;
   char temp[FILE_NAME_LENGTH];
@@ -1110,7 +1330,11 @@
 *                  function appends a path separator on output.
 *
 ******************************************************************************/
+#ifdef USE_PVM
+void setup_output_file_name()
+#else
 static void setup_output_file_name()
+#endif
 {
   char number_string[10];
   char separator_string[2] = {FILENAME_SEPARATOR, 0} ;
@@ -1219,8 +1443,11 @@
 *   -
 *
 ******************************************************************************/
-
+#ifdef USE_PVM
+void open_output_file()
+#else
 static void open_output_file()
+#endif
 {
   int Buffer_Size;
   
@@ -1378,12 +1605,18 @@
   opts.Radiosity_Nearest_Count = 6;
   opts.Radiosity_Recursion_Limit = 1;
   opts.Radiosity_Quality = 6;     /* Q-flag value for light gathering */
+#ifdef USE_PVM
+  opts.Radiosity_File_ReadOnContinue = PvmSlave ? 0 : 1;
+  opts.Radiosity_File_SaveWhileRendering = PvmSlave ? 0 : 1; /* Don't save radiostiry cache with PVM */
+  opts.Radiosity_File_AlwaysReadAtStart = 0;
+  opts.Radiosity_File_KeepOnAbort = PvmSlave ? 0 : 1;
+#else
   opts.Radiosity_File_ReadOnContinue = 1;
   opts.Radiosity_File_SaveWhileRendering = 1;
   opts.Radiosity_File_AlwaysReadAtStart = 0;
   opts.Radiosity_File_KeepOnAbort = 1;
+#endif
   opts.Radiosity_File_KeepAlways = 0;
-
 
   init_statistics(stats);
   init_statistics(totalstats);
diff -Naur source.ori/pvm/PVMPOV.Changelog source/pvm/PVMPOV.Changelog
--- source.ori/pvm/PVMPOV.Changelog	Thu Jan  1 01:00:00 1970
+++ source/pvm/PVMPOV.Changelog	Sun Sep 12 00:25:35 1999
@@ -0,0 +1,17 @@
+ * 3.1e.2 [Jakob Flierl]
+  - fixed problem with the statistics collection in line 1331 of "pvm.c"
+  - minor changes in "sources/pvm/Makefile.aimk"
+  - updated documentation
+  - added "PVMPOV.Changelog" and "PVMPOV.benchmark"
+ * 3.1e.1 [Jakob Flierl]
+  - applied the patch to POV-Ray version 3.1e
+  - fixed at least partially a memory bug in "render.c". Thanks to Michael
+    Eilers for solving this problem at least partially.
+ * 3.0x [Harald Deischinger]
+  - applied the patch to POV-Ray 3.01 and 3.01
+  - several command line enhancements.
+ * 2.2 to 2.9 [Andreas Dilger]
+  - changes in optin.h, optin.c, optout.h, optout.c,
+               povray.c, render.h, render.c
+  - added pvm/Makefile.aimk, pvm/pvm.h, pvm/pvm.c
+ * Initial Version [Brad Kline, Cray Inc.]
diff -Naur source.ori/pvm/PVMPOV.benchmark source/pvm/PVMPOV.benchmark
--- source.ori/pvm/PVMPOV.benchmark	Thu Jan  1 01:00:00 1970
+++ source/pvm/PVMPOV.benchmark	Sun Sep 12 00:25:35 1999
@@ -0,0 +1 @@
+Surf to http://www.haveland.com/povbench/ to look at some render statistics.
diff -Naur source.ori/pvm/PVMPOV.example source/pvm/PVMPOV.example
--- source.ori/pvm/PVMPOV.example	Thu Jan  1 01:00:00 1970
+++ source/pvm/PVMPOV.example	Sun Sep 12 00:25:35 1999
@@ -0,0 +1,283 @@
+This file describes the command line options of PVMPOV, as well as the general
+theory behind how it operates.
+
+Theory of Operation
+-------------------
+Using the PVM model, there is one master and many slave tasks. The master has 
+the responsibility of issuing the work sections to the slaves, and receiving 
+portions of the rendered sections back.  The master does not render anything
+by itself.  The PVM component is only active if the user gives the "+N" option
+to POV.  Otherwise, PVMPOV behaves the same as regular POV-Ray and runs a
+single task only on the local machine.
+
+Valid POV-Ray command-line options relating to PVM are:
+
+    pvm=on
+    +N      This is the default for starting PVMPOV.  One slave will be
+	    started on each available host, regardless of architecture, and
+	    the blocks will be 32x32 pixels in size.  The slaves will be
+	    started with a nice value of 5, which means they will run at a
+	    lower priority than other user jobs. 
+    pvm=off
+    -N      Turns of PVM support. PVMPOV now runs exactly as normal POV-Ray. 
+            You should do this when there are still errors in your pov-file. 
+            PVMPOV will not display error message otherwise.
+
+    pvm_tasks=xx
+    +NTxx   Start xx tasks on the available PVM hosts.  This is usually only
+            useful if debugging on a single machine, or for starting more
+	    than 1 task on multi-processor hosts.  If, for example, you have
+	    10 machines with 4 CPUs each, you could specify +nt40 to start 4
+	    processes on each host (and the OS will hopefully run 1 on each
+	    CPU).  
+
+            Note that PVM is stupid in the way it starts tasks, so if,
+	    in the previous example, one of the hosts has only one CPU, it will
+	    still have 4 slaves started on it. You can use the "pvm_hosts"
+            option (see below) to control on which machines the tasks are 
+            started.
+
+            Starting multiple tasks on a single processor will always be less 
+            efficient than a single task because of context switching and extra 
+            message passing.
+
+    pvm_arch=arch
+    +NAarch Start the tasks only on the PVM architecture "arch". If +NT is not
+	    given, one task will be started on each of the hosts of the given
+	    architecture.
+
+    pvm_nice=xx
+    +NNxx   Run the slaves at a niceness factor of xx.  The default niceness
+	    is 5.  In general, changing the niceness value will not affect
+	    performance very much, but may get others upset with you.  The
+	    nicest setting for pvmpov is 20, while the least nice setting is
+	    0.  Note that these values are always used even on systems that
+	    use nice values from 20-40.  See the installation document and
+	    the man page for nice for more information.
+
+    pvm_width=xx
+    +NWxx   Change the width of the blocks to xx pixels.  The default width
+	    is 32 pixels.
+
+    pvm_height=xx
+    +NHxx   Change the height of the blocks to xx pixels.  The default height
+	    is 32 pixels.
+
+            It is important to note that by varying the size of the grid
+	    sections, you can affect the performance of the rendering.  If you
+	    have particular renderings that are very complex in a small portion
+	    of the display, then a finer grain may help.  In this way, more of
+	    the tasks are able to migrate towards the grid sections that are
+	    more complex.  Conversely, if you have a shorter render or a 
+	    slower network, it may be advantageous to have larger blocks to
+	    reduce network overhead, as well as ensure the slaves are not idle
+	    waiting for blocks to render.
+
+	    You must also consider overhead if using anti-aliasing.  Anti-
+	    aliasing requires the line segment above and below the grid section
+	    to be traced so that super-sampling may occur.  If the height of the
+	    grid is reduced in size, and anti-aliasing is turned on, your
+	    percentage of overhead goes up.  For example, setting a height of
+	    four (-NH4) using anti-aliasing would have more than 25% overhead.
+	    If the image size is not an integer multiple of the grid size, the
+	    edge blocks are smaller (ie extra pixels aren't rendered), so it
+	    is not necessary to evenly divide the image into blocks.
+
+     pvm_slave=slave
+     +NSslave  Uses slave as filename for the slave tasks. If you do not 
+            specify this option PVMPOV will use the current executable name
+            also for the slaves. 
+
+            Using this option you can for example run the X11 version
+            (x-pvmpov) as master (to display the results) and a version
+            without any display support (pvmpov) as slaves.
+
+     pvm_wd=dir
+     +NDdir Set the working directory for the slaves. By default PVMPOV
+            tries to run the slaves in the same directory, as the master.
+            But sometimes 'getcwd' gives misleading output (when automounting
+            is used), or you simply want to run the slaves in some other
+            directory, then you can use this option.
+
+     pvm_hosts=name1,name2,...
+            Set the names of the hosts to use for slaves. Note, that there are
+            not spaces allowed between the names!
+         
+            By default PVM distributes the processes in some order to the
+            available machines. Sometimes the choice of PVM is not the best,
+            so you can specify explicitly which machines to use. 
+            
+            You can use more tasks, then you specify here. You can use the
+            options in this way: pvm_hosts=darkstar,darkstar,baby +nt6
+            This will start 6 tasks (+nt6 must come after the pvm_hosts),
+            4 on darkstar and 2 on baby.
+   
+
+For example, if I wanted to distribute an 1024x768 rendering and use eight PVM 
+tasks to do the work, I would use the +NT8 option, and let the PVM master 
+define 768 32x32 sections.  Eight slave tasks would be launched, and when ready,
+they would request work to do from the master.  The master then issues a column
+and row range back to the requesting slave.
+
+% pvmpov +nt8 +w1024 +h768 +iskyvase.pov +oskyvase.tga
+
+As each quarter of a grid is completed, the slave sends it back to the
+master, which buffers the incoming blocks until an entire line recieved, at
+which time it writes the line to disk with the specified file format.  If
+all slaves did perfectly equal work in this example, they would be issued 96
+sections of work, and would have returned 384 messages of 32x8 pixels each.
+
+Note that the work issues are done essentially one at a time.  As each slave
+starts up it requests a single block, and as it recieves a work request, it 
+requests the next block.  In this way, effective load balancing can occur.
+Tasks rendering the "easy" sections will eventually all migrate towards the
+harder sections.  Seriously imbalanced distributions will be seen by widely
+varying percentages shown at the end of the rendering, assuming all of the
+hosts are identical.  Since each slave always has a block to be rendered, it
+will be kept busy without waiting for the master to recieve its work request
+and reply with a new block assignment.
+
+If for some reason any of the slaves are very slow, or they are interrupted
+during their operation, their blocks are reassigned to other slaves after
+all of the blocks have been assigned a first time.  This means that the render
+can be completed quickly even if some of the slaves have problems, or if some
+blocks have been assigned to slower slaves while the faster slaves are idle.
+This will show up as some percentage of late blocks for that machine in the
+statistics at the end.  Note that blocks will NOT be reassigned to slaves that
+are significantly slower than average, in preference to reassigning it to a
+faster slave when it becomes available.
+
+Since only complete lines are written out to disk, interrupted traces will
+be restarted at the last complete line that was written to disk, regardless
+of how many blocks were buffered by the master at the time.  However, it is
+possible to re-start an interrupted trace in the same method as POV-Ray.
+
+Known bugs (and other limitations)
+-------------------------------------
+All of the slaves must to share the same file system as the master process,
+and the source file must be mounted in the same location on each one.  This
+may limit the number of hosts that can be used in some circumstances.
+
+The command line arguments for specifying hosts is not cumulative, so
+
+% pvmpov +naSUNMP +nt24 +n +iskyvase.pov +oskyvase.tga
+
+will not start 24 slaves on the multi-processor SUN system(s) (which may have
+4 CPUs each), and then start 1 slave on each of the remaining systems.
+
+The statistics for the image being rendered may not be accurate if any of the
+slaves is too slow, or stops for some reason.  As well, since some sections
+may be rendered twice if the block is reassigned, the statistics will not be
+exactly the same as if it were rendered on a single host.  The master only
+waits a few seconds for statistics to arrive before printing them.
+
+The master does not parse the input file. Because of that it displays
+no error messages concerning the input file. As long as your input file
+still contains error you should disable PVM support (-N or pvm=off)
+
+Execution example (from version 2.9):
+-------------------------------------
+You first must have a PVM daemon launched on each machine that will be 
+participating in the rendering.  Refer to the PVM 3.3 documentation.  The 
+following is an example is from Jason Hough, and was generated on a group
+of six Solaris based 4-processor SPARCstation 20s.  His home directory is
+auto-mounted to all of these hosts.
+
+He keeps the pvm daemon installed in a directory called "bin", given by
+"dx=./bin/pvmd3" relative to his home directory, and pvmpov is in various
+subdirectories under "bin" (ie bin/SUN4, bin/SUNMP, bin/LINUX, etc.), given
+by the executable path "ex=./bin", so his pvm.hosts file looks like:
+
+% cat pvm.hosts
+glee    dx=./bin/pvmd3 ep=./bin
+elation dx=./bin/pvmd3 ep=./bin
+ecstasy dx=./bin/pvmd3 ep=./bin
+bliss   dx=./bin/pvmd3 ep=./bin
+delight dx=./bin/pvmd3 ep=./bin
+rapture dx=./bin/pvmd3 ep=./bin
+
+Note that, by default, PVM looks for executables in $HOME/pvm3/bin/$PVM_ARCH,
+and pvmd should be in $PVM_ROOT/lib, so if this is the case on your systems,
+you don't need to have anything in your pvm.hosts file except the hostnames,
+one per line.  An exception is RS6K, which needs the dx= no matter what.  See
+the PVM documentation and/or the pvmd3 man page for more information on what
+all of this means if you don't understand it.
+
+The following command launches the PVM daemons.
+
+% pvm pvm.hosts
+3.3.7
+t40001
+pvm> conf
+6 hosts, 1 data format
+		    HOST     DTID     ARCH   SPEED
+		    glee    40000    SUNMP    1000
+		 elation    80000    SUNMP    1000
+		 ecstasy    c0000    SUNMP    1000
+		   bliss   100000    SUNMP    1000
+		 delight   140000    SUNMP    1000
+		 rapture   180000    SUNMP    1000
+pvm> quit
+
+pvmd still running.
+
+Now that the PVM daemons are up and waiting for work to do, we can render.
+Note that for these MP machines he forces pvmpov to start more tasks than
+the default 1 per host, and uses a 64x64 block size:
+
+% pvmpov -Iskyvase.pov -Oskyvase.tga +nt24 +nw64 +nh64 +v
+
+POV-Ray Options in effect: +v1 +ft +mb25 +nt24 +nn5 +nw64 +nh64 +a0.300
++j1.000 +b999 +r3 -q9 -w1024 -h768 -s1 -e768
+-k0.000 -mv2.0 -iskyvase.pov -oskyvase.tga 
+   ...at least 13 tasks successfully spawned in time.
+   ...Don't worry, more are on the way, I'm just not waiting
+PVM Task Distribution: Tasks-24  Grid width-64  Grid height-64  Sections-192
+
+Waiting for slave stats.
+
+PVM Task Distribution Statistics:
+           host name  [ done ] [ late ]           host name  [ done ] [ late ]
+                glee  [ 4.17%] [ 0.00%]                glee  [ 4.17%] [ 0.00%]
+                glee  [ 4.17%] [ 0.00%]                glee  [ 4.17%] [ 0.00%]
+             elation  [ 4.69%] [ 0.00%]             elation  [ 4.17%] [ 0.00%]
+             elation  [ 4.17%] [ 0.00%]             elation  [ 4.17%] [ 0.00%]
+             ecstasy  [ 3.65%] [ 0.00%]             ecstasy  [ 4.69%] [ 0.00%]
+             ecstasy  [ 4.69%] [ 0.00%]             ecstasy  [ 4.17%] [ 0.00%]
+               bliss  [ 3.65%] [ 0.00%]               bliss  [ 4.17%] [ 0.00%]
+               bliss  [ 4.69%] [ 0.00%]               bliss  [ 3.65%] [ 0.00%]
+             delight  [ 3.65%] [ 0.00%]             delight  [ 4.17%] [ 0.00%]
+             delight  [ 4.17%] [ 0.00%]             delight  [ 4.17%] [ 0.00%]
+             rapture  [ 4.69%] [ 0.00%]             rapture  [ 4.17%] [ 0.00%]
+             rapture  [ 4.17%] [ 0.00%]             rapture  [ 3.65%] [ 0.00%]
+
+
+skyvase.pov statistics
+--------------------------------------
+Resolution 1024 x 768
+# Rays:     3773743    # Pixels:      798720  # Pixels supersampled:      17381
+  Ray->Shape Intersection Tests:
+   Type             Tests    Succeeded   Percentage
+  -----------------------------------------------------------
+  Sphere          6304452     1170727       18.57
+  Plane          63822062    35385552       55.44
+  Quadric         6304452     2770858       43.95
+  Cone            5918163     4839298       81.77
+  Bounds          5918163     3152226       53.26
+  Calls to Noise:      4327871
+  Calls to DNoise:     5141872
+  Shadow Ray Tests:   10498615     Blocking Objects Found:      254807
+  Reflected Rays:      2818594
+  Time For Trace:    0 hours  0 minutes 47.00 seconds
+
+------
+NB: Note that for comparison purposes with other skyvase benchmarks that this
+    is rendered at 1024x768 instead of the usual 640x480!
+
+Enjoy!
+
+Andreas Dilger
+adilger@enel.ucalgary.ca
+
+Harald Deischinger
+k3096e5@c210.edvz.uni-linz.ac.at
diff -Naur source.ori/pvm/PVMPOV.general source/pvm/PVMPOV.general
--- source.ori/pvm/PVMPOV.general	Thu Jan  1 01:00:00 1970
+++ source/pvm/PVMPOV.general	Sun Sep 12 00:25:35 1999
@@ -0,0 +1,98 @@
+
+ - PVMPOV -                             written by Andreas Dilger, June 1 1995
+                                                  and Harald Deischinger, 1997
+                                                modified by Jakob Flierl, 1999
+
+
+*****      NOTE - This is an UNOFFICIAL modification to POV-Ray 3.1e       *****
+
+** DO NOT SEND PROBLEM REPORTS TO THE POV TEAM REGARDING THESE MODIFICATIONS. **
+
+The author disclaims all warranties with regard to this software, including 
+all implied warranties of merchant-ability and fitness.  The code is simply 
+distributed as it is. 
+
+
+General information
+-------------------
+
+"I only ask that credit (or blame) is attributed to me for the original work."
+                                                             - Brad Kline
+
+The original author of the PVM POV-Ray patch on which this is based is Brad
+Kline, of Cray Research, Inc.  Because of problems running the original code at
+my site, and a desire to learn more about PVM for my Master's work, I have
+changed large portions to not only be more user-friendly about reporting
+errors, but also hopefully more robust and faster.
+                                                         - Andreas Dilger
+
+Because Andreas has other things to do, I have taken over the part of
+PVMing POV-Ray 3.1. If you have problems with this program, don't be afraid
+to ask me for help. 
+
+Please send me a mail, if you're using PVMPOV Version 3.1e.2. 
+                                                           - Jakob Flierl
+Contact
+-------
+email    : flierl@luga.de
+
+Important information/Problems
+------------------------------
+
+* This version is not tested very vell, so it is very likely, that you
+  find some errors - please tell me about them.
+
+  Especially the very time consuming new features (radiosity) are not
+  really tested.
+
+* Shellout commands are always done by the master process.
+
+* Now PVMPOV also supports animations. PVMPOV computes multiply frames
+  simultaniously, so it is not possible to do "recursive animations"
+  (like the desk example in povscn/level3). You have to run PVMPOV extra
+  for each frame.
+
+  All the pre-scene shellouts are done in the correct order, and the same
+  for the post-scene shellouts. BUT for example the pre-scene shellout for 
+  frame 2, will be executed before the post-scene shellout for frame 1!
+
+  Field Rendering (+UF) is not working yet.
+
+* The X11 display now displays everything. 
+  There are no longer "forgotten blocks".
+
+* The master process of PVMPOV does not parse the input file. So you will
+  NOT see errors in the .pov file - the slaves will simply not start.
+  So you should turn off PVM support (pvm=off or -N) while developing your
+  scene file.
+
+  You will also get no warning, if the slave can not find the input file.
+  The slave will simply never ask for work. Check "/tmp/pvml.<uid>" for
+  errors with the slaves.
+
+* You might get errors, that pvm can not find the executables for the slaves.
+  You can solve this in lot's of ways. 
+  - Start pvmpov with an absolute filename,
+    e.g. '/usr/bin/pvmpov ...'
+  - Specify the absolute path for the slaves, 
+    e.g. 'pvmpov -NS/usr/bin/pvmpov ...'
+    You can set this option in you '.povrayrc' file.
+  - Move your executables into ~/pvm3/bin/ARCH
+  - Use the 'ep=PATH' option in your hostfile 
+  Read the PVM documentation for more information.
+
+* When using automount you might have the problem, that the slaves can't
+  change to the working directory. Use the +ND (pvm_wd) option.
+  Calling pvmpov with "+ND$PWD" should solve the problem.
+
+* For more information see "PVMPOV.1st_scene"
+
+Changed files
+-------------
+   optin.c             Accept new options for PVMPOV
+   optin.h
+   optout.c            Print new options and help texts for PVMPOV
+   optout.h            
+   povray.c            Major changes
+   render.c            Minor changes
+   render.h
diff -Naur source.ori/pvm/PVMPOV.install source/pvm/PVMPOV.install
--- source.ori/pvm/PVMPOV.install	Thu Jan  1 01:00:00 1970
+++ source/pvm/PVMPOV.install	Sun Sep 12 00:25:35 1999
@@ -0,0 +1,39 @@
+How to compile and install PVMPOV. 
+
+COMPILE
+-------
+Before compiling PVMPOV you must me sure to have PVM installed correctly.
+PVM is not included with this package. You have to download and install it
+manually: http://www.epm.ornl.gov/pvm/pvm_home.html
+
+After that you can compile and install PVMPOV:
+
+  tar xvfz pvmpov-3.1e.?.tgz <- unpack the PVMPOV distfiles
+  cd pvmpov3_1e_?
+  tar xvfz ~/povuni_s.tgz    <- unpack the POV source from ftp://ftp.povray.org/
+[POV-Ray versions 3.1e - 3.1g are reported to work fine with PVMPOV 3.e1.2.]
+
+  ./inst-pvm                 <- apply the PVMPOV patch
+
+[This script applies the patch and searches for any rejected files.
+If there are any .rej-files the changes are not done correctly - 
+you can try to do the changes by hand.]
+
+  cd pvmpov3_1e_?/povray31/source/pvm
+
+[You can choose:]
+  aimk newunix               <- to create the UNIX text only binaries
+  aimk newsvga               <- to create binaries for svgalib (Linux only)
+  aimk newxwin               <- to create binaries using X11 to display
+
+This should create the executables 'pvmpov', 's-pvmpov' or 'x-pvmpov'.
+
+INSTALL
+------
+If your are running PVMPOV on a homogenous cluster, you can copy the
+executables to "/usr/bin" and "/usr/X11R6/bin".
+
+Read "PVMPOV.example" to get started.
+
+Jakob Flierl, flierl@luga.de
+May 1999
diff -Naur source.ori/pvm/PVMPOV.radiosity source/pvm/PVMPOV.radiosity
--- source.ori/pvm/PVMPOV.radiosity	Thu Jan  1 01:00:00 1970
+++ source/pvm/PVMPOV.radiosity	Sun Sep 12 00:25:35 1999
@@ -0,0 +1,39 @@
+[...] PVMPOV and radiosity:
+
+Radiosity is currently not working with PVMPOV; the resulting images look like
+mosaics. There's a currently only a workaround suggested by Andreas Dilger:
+
+You must create a .rca file for the whole image [when rendering with the
+radiosity option turned on], which I did manually by running
+"pvmpov -n +qr +d +i <scene>.pov" and stopping the rendering when the mosaic
+preview is complete, to give me <scene>.rca. Then I started a new
+"pvmpov +c +qr +d +i <scene>.pov +nt2" on my 2 CPU system, and it rendered
+the same image as letting "pvmpov -n +qr +d +i <scene>.pov" finish on 1 CPU.
+The <scene>.rca file was readable by both slave systems because they were local,
+but it would also be possible to use NFS for this, like normal PVMPOV.
+This is some work to do manually, but it will ensure that the radiosity
+will work properly with PVMPOV.
+
+[for programmers only:]
+What needs to be done now is to have the PVMPOV master run the mosaic
+preview for radiosity before the slave tasks start.  It looks like this
+could be done in pvm.c:PvmStartFrame(), but the current design of the
+master doesn't allow it to do any rendering because it does not parse
+the scene, so it would need to be reworked to do this.
+
+In the old PVMPOV 2.2 design, the master did the parsing of the scene
+file to ensure that the syntax was correct.  I think this is the better
+design.  If radiosity is used, the master will render the preview before
+the rendering is started on the slaves, so the .rca file is available.
+If the master does the parsing, then it can also send the data to the
+slaves via the POB binary file format through PVM (no NFS needed) so we
+don't waste the time spent parsing the scene at the master.
+
+I think what needs to be done is modify povray.c so it doesn't call
+Pvm_Master_Control() instead of FrameRender() in povray.c:398.  Then
+FrameRender() should be modified to work with PVMPOV code, replacing
+PvmStartFrame() entirely.  This will mean that PVMPOV will render one
+frame at a time, which is OK I think, because it means that some of
+the problems with PVMPOV 3.x will be fixed, like post-scene shellouts.
+I think it will also make PVMPOV less complex also, because it only
+has to work on 1 frame at a time.
diff -Naur source.ori/pvm.c source/pvm.c
--- source.ori/pvm.c	Thu Jan  1 01:00:00 1970
+++ source/pvm.c	Sun Sep 12 00:25:35 1999
@@ -0,0 +1,1556 @@
+/****************************************************************************
+*  pvm.c
+*
+*  This module implements the PVM control routines for PVM'd POVRAY.
+*
+*  This file was written by Brad Kline.  April 1994.
+*                modified by Andreas Dilger Jan - May 1995
+*                modified by Harald Deischinger, 1996 - 1997
+*
+*  NOTE - PVM is not supplied here.
+*
+*  You need the PVM 3.x libraries, include files, and PVMD daemons.
+*  
+*  PVM is available from the University of Tennessee, Knoxville, TN.
+*
+*  The author disclaims all warranties with regard to this software, 
+*  including all implied warranties of merchant-ability and fitness. 
+*  The code is simply distributed as it is.
+*
+* 970610 - New option PVM_WD. To specify a working directory for
+*          the slaves. [Deischi]
+*          New option PVM_Hosts. To give names for hosts to use
+*          as slaves. [Deischi]
+*
+* 9704.. - changed to to animations, lots of changes
+*          simplifications to the whole thing [Deischi]
+*
+* 96.... - Changed code to work with POVRAY 3.0 [Deischi]
+*
+* 950508 - Changed code that allocates blocks to be more robust.
+*          Changed the write_line routines to hook into the existing routines.
+*          Changed the slave startup processes to be more informative.
+*
+* 940511 - Remove code that tried to fit grid sections into whole parts. The
+*          code now supports odd sized images.
+*
+*****************************************************************************/
+#include <sys/time.h>
+#include <sys/resource.h>
+#include "frame.h"
+#include "vector.h"
+#include "povproto.h"
+#include "frame.h"
+#include "povray.h"
+#include "render.h"
+#include "optout.h"
+#include "pvm3.h"
+#include "pvm.h"
+
+
+/* This distribution scheme breaks down the image into to two dimensional
+ * areas.  Each area has a designated grid control point.  The grid area
+ * is up to PvmChunkWidth (-NWxx) pixels wide by PvmChunkHeight (-NHxx)
+ * high. If one uses the default, then a grid section would be 32x32, or
+ * 1024 pixels.  In a 640x480 image, this would create 300 grid control
+ * points, and therefore 300 different sections to do work on (not lines.).
+ */
+
+/*
+ * clock value in shellout command is not working correctly
+ * timings are not displayed (and done) correctly
+ * statistics can be wrong
+ * continue trace might produce wrong results -- needs testing
+ */
+
+/*
+ * Global variables
+ */
+char    PvmArch[20] = { 0 };
+int     PvmChunkHeight = PVM_DEFAULT_GRID_HEIGHT;	/* height of a block */
+int     PvmChunkWidth  = PVM_DEFAULT_GRID_WIDTH;	/* widht of a block */
+int     PvmRowsToSend = 1;
+int     PvmSlave = 0;
+int     PvmTasks = 9999;
+int     PvmNice = PVM_DEFAULT_NICE;
+int     PvmMTid;
+int     PvmBlockNum;
+char *  PvmSlavename = NULL;
+int	PvmNextFrame = 0;
+char	PvmWorkingDir[PATH_MAX+1] = "";			/* PVM Working Directory */
+char ** PvmHosts = NULL;
+int	PvmHostsN = 0;
+
+/*
+ * local functions
+ */
+static void PvmSpawnError PARAMS((int));
+static void PvmSpawnTidError PARAMS((int));
+static void PvmSpawn PARAMS((void));
+static void PvmCheckFirst PARAMS((void));
+static void PvmInitSlaveStat PARAMS((void));
+static void PvmInitFrameStat PARAMS((void));
+
+static int PvmMasterReceive PARAMS((void));
+static void PvmIdentifySlave PARAMS((void));
+static void PvmSendWork PARAMS((int block));
+static void PvmReassignWork PARAMS((int block));
+static void PvmAssignWork PARAMS((void));
+static void PvmMasterEnd PARAMS((void));
+static int PvmStartFrame PARAMS((void));
+static void PvmFinishFrame PARAMS((void));
+static void PvmReceiveData PARAMS((void));
+static void PvmWrite PARAMS((void));
+
+static void PvmUnpackStats PARAMS((void));
+
+
+static int grid_points;		/* number of grid blocks for one frame */
+static int grid_ppline;		/* Number of grid blocks in a row */
+static int frames;		/* num. of frames to do */
+static int frame = -1;		/* the current frame, start with 0 to count */
+static int next_frame_finish;	
+static int frame_display;	/* the frame that is displayed */
+
+static int grid_lines_done = 0;	/* num. of PvmCthunkWidth lines done (only statistics) */
+
+static int npixels_done = 0;    /* Number of pixels done, by all processors */
+
+static int                row_start;           /* First row in the block */
+static int                row_end;             /* Last row in the block */
+static int                col_start;           /* First column in the block */
+static int                col_end;             /* Last column in the block */
+static int msgtag; 
+
+static   struct timeval     wait_time;           /* Time to wait for slave stats */
+static   struct pvmhostinfo *hostinfo;           /* Info on each PVM host */
+static   int                minions;             /* Number of slave tasks */
+static   int                nhost;               /* Number of available pvm hosts */
+static   pvm_slave_stat     *slave_stat;         /* Info on the slaves */
+static   pvm_frame_stat     *frame_stat;
+static   int                rtid;                /* tid of the message sender */
+static   int                *tids;               /* tids of all the slaves */
+static   int                slave_num;           /* Relative host number of sender */
+static   char               *slave_name;         /* Hostname of sending slave */
+static   int                nstat = 0;           /* Number of slaves returning stats */
+
+static   int                bitmask;             /* Start tasks on a specific arch */
+static   int                bufid;               /* pvm recieve buffer id */
+static   int                bytesin;             /* Size of message */
+static   char               **sargs;             /* argv for the slaves */
+static   char               slave_option[PATH_MAX+4]; /* the directory argument */
+
+
+/* in povray.c */
+extern char Actual_Output_Name[FILE_NAME_LENGTH];
+void setup_output_file_name PARAMS((void));
+void open_output_file PARAMS((void));
+void set_output_file_handle();
+
+
+
+/********************************************************************************
+ * Initialize Master Process
+ *******************************************************************************/
+
+
+/*
+ * Spawn the slaves, and check for errors 
+ */
+
+/* handle an error from pvm_spawn */
+static void PvmSpawnError(m) 
+    int m; 
+{
+    /* Only quit if we can't start many tasks, or an error condition. */
+    Error_Line( "...error spawning tasks because \n");
+    switch (m) {
+    case PvmBadParam:
+	Error_Line("of bad parameter.\n");
+	break;
+    case PvmNoHost:
+	Error_Line("host not in PVM.\n");
+	break;
+    case PvmNoFile:
+	Error_Line("executable not found.\n");
+	break;
+    case PvmNoMem:
+	Error_Line("no memory on host.\n");
+	break;
+    case PvmSysErr:
+	Error_Line("pvmd not responding.\n");
+	break;
+    case PvmOutOfRes:
+	Error_Line("lack of resources.\n");
+	break;
+    default:
+	Error_Line("of unknown error.\n");
+    }
+    pvm_perror("");
+    pvm_exit();
+    close_all();
+    exit(1);
+}
+
+static void PvmSpawnTidError(tid) 
+    int tid; 
+{
+
+    Warning(0.0, "...spawn failure because ");
+    switch (tid) {
+    case PvmBadParam:
+	Warning(0.0, "of bad parameter.\n");
+	break;
+    case PvmNoHost:
+	Warning(0.0, "host not in PVM.\n");
+	break;
+    case PvmNoFile:
+	Warning(0.0, "executable not found.\n");
+	break;
+    case PvmNoMem:
+	Warning(0.0, "no memory on host.\n");
+	break;
+    case PvmSysErr:
+	Warning(0.0, "pvmd not responding.\n");
+	break;
+    case PvmOutOfRes:
+	Warning(0.0, "lack of resources.\n");
+	break;
+    default:
+	Warning(0.0, "of unknown error.\n");
+    }
+}
+
+static void PvmSpawn() {
+    int i;
+
+    /* Start up the slave processes */
+    if (PvmArch[0] != '\0') {
+	Status_Info("  Spawning %s with %d PVM tasks on arch %s...\n",
+		    PvmSlavename, PvmTasks,PvmArch);
+    } else {
+	Status_Info("  Spawning %s with %d PVM tasks on %d hosts...\n",
+		    PvmSlavename, PvmTasks,nhost);
+    }
+
+    if(PvmHosts) {			/* start at specified hosts */
+	int m;
+	minions = 0;
+	for(i=0; i < PvmTasks; i++) {	/* start one by one */
+	    m = pvm_spawn(PvmSlavename, sargs, PvmTaskHost, PvmHosts[i % PvmHostsN], 
+			  1, tids+minions);
+	    if( m < 0) {			/* spawn failed */
+		PvmSpawnError(m);
+	    } else if (m==0) {			/* failed a little bit */
+		PvmSpawnTidError(tids[minions]);
+	    }
+	    minions += m;
+	}
+
+    } else {				/* start all at once somwhere */
+	minions = pvm_spawn(PvmSlavename, sargs, bitmask, PvmArch, PvmTasks, tids);
+
+	if(minions < 0)			/* check for total failure */
+	    PvmSpawnError(minions);
+	for (i = minions; i < PvmTasks; i++)	/* errors/process */
+	    PvmSpawnTidError(tids[i]);
+    }
+
+    /* Check if "few" tasks could be started */
+    if (minions < (PvmTasks + 1) / 2)  {
+	if(minions==0) {
+	    Error_Line("...No tasks");
+        } else {
+	    Error_Line("...only %d of %d tasks", minions, PvmTasks);
+	}
+	Error_Line(" spawned!  Quitting.\n");
+	pvm_exit();
+	close_all();
+	exit(1);
+    } else {
+	Status_Info("  ...%d PVM tasks successfully spawned.\n", minions);
+    }
+
+    PvmTasks = minions;
+}
+
+
+/*
+ * Wait up to 120 seconds for the first to check in
+ */
+static void PvmCheckFirst() {
+    wait_time.tv_sec = 120;
+    wait_time.tv_usec = 0;
+
+    Status_Info("  Waiting up to %lds for first slave to start...\n",
+		wait_time.tv_sec);
+    minions = 0;
+
+    if( pvm_trecv(-1, PVM_INIT_SLAVE, &wait_time) <= 0 ) {
+	/* No slave checked in. Something is wrong */
+	Error_Line("First slave did not start in time!  Quitting.\n");
+	Error_Line("See /tmp/pvml.<your uid> on the master PVM host for\n");
+	Error_Line("more info on why the slave didn't start correctly.\n");
+	pvm_exit();
+	close_all();
+	exit(1);
+    }  else {
+	minions++;
+    }
+
+    if (opts.Options & VERBOSE) {
+	Status_Info("  Slave 0 successfully started.\n");
+    }
+}
+
+
+/* 
+ * Get a status struct for each slave 
+ */
+static void PvmInitSlaveStat() {
+    
+    slave_stat = (pvm_slave_stat *)POV_CALLOC(PvmTasks, sizeof(pvm_slave_stat), "slave_stat");
+    
+    /* Set up pointers to all the host names and the slave status */
+    for (slave_num = 0; slave_num < PvmTasks; slave_num++) {
+	int j;
+	int dtid;
+
+	dtid = pvm_tidtohost(tids[slave_num]);
+	slave_stat[slave_num].name = "unknown";
+
+	for (j = 0; j < nhost; j++) {
+	    if (dtid == hostinfo[j].hi_tid) {
+		slave_stat[slave_num].name = (char*)POV_CALLOC(strlen(hostinfo[j].hi_name)+1, 
+							       sizeof(char), "hostnames");
+		strcpy(slave_stat[slave_num].name,hostinfo[j].hi_name);
+		break;
+	    }
+	}
+	slave_stat[slave_num].frame_assigned = PVM_SLAVE_FREE;
+	slave_stat[slave_num].block_reassigned = PVM_SLAVE_FREE;
+    }
+}
+
+/* 
+ * Get a status struct for each frame
+ */
+static void PvmInitFrameStat() {
+    int i,j;
+
+    frames = (opts.FrameSeq.FrameType == FT_MULTIPLE_FRAME) ? 
+	opts.FrameSeq.FinalFrame - opts.FrameSeq.InitialFrame + 1 :
+	1;
+    frame_stat = (pvm_frame_stat *)POV_CALLOC(frames, sizeof(pvm_frame_stat), "frame_stat");
+    frame_display = -1;
+
+    for(i=0; i < frames; i++) {
+	frame_stat[i].block_to_assign = 0;
+	frame_stat[i].block_to_reassign = 0;
+
+	frame_stat[i].block_to_write = 0;
+
+	frame_stat[i].row_to_write  = opts.First_Line;
+	frame_stat[i].row_to_malloc = opts.First_Line;
+
+	frame_stat[i].block_stat = 
+	    (pvm_block_stat *)POV_CALLOC(grid_points, sizeof(pvm_block_stat), "block_stat");
+
+	for(j=0; j < MaxStat; j++)
+	    Init_Counter(frame_stat[i].stats[j]);
+    }
+}
+
+/*
+ * Initialize PVM Master
+ */
+void 
+Pvm_Master_Init(argc, argv)
+    int     argc;
+    char    **argv;
+{
+    int                i;
+
+    Status_Info("Initializing PVMPOV\n");
+
+    /* Get a table for the TIDs */
+    tids = (int *)POV_CALLOC(PvmTasks, sizeof(int), "tids");
+
+    /* Build a new arg list for the sub-tasks - add -ni in front */
+    sargs = (char **)POV_CALLOC(argc + 1, sizeof(char *), "sargs");
+
+    /* Move argument pointers to new list array, keep position 0 free for -ni option */
+    for (i = 1; i < argc; i++) {
+	sargs[i] = argv[i];
+    }
+
+    /* Get current directory for the slave tasks */
+    if(PvmWorkingDir[0] == '\0')
+	if ( GETCWD(PvmWorkingDir) == NULL) {
+	    Error("PVM Master cannot get current directory.\n");
+	    return;
+	}
+
+    /* Add slave flag */
+    sprintf(slave_option, "-nI%s", PvmWorkingDir);
+    sargs[0] = slave_option;
+
+    /* Enroll in PVM */
+    if (pvm_mytid() < 0) {
+	Error("Error starting master task.\n");
+    }
+
+    if (pvm_config(&nhost, (int *)NULL, &hostinfo) < 0) {
+	pvm_exit();
+	Error("Error getting PVM machine status.\n");
+    }
+           
+    bitmask = PvmTaskDefault;
+
+    /* If PvmArch is specified, use that architecture */
+    if (PvmArch[0] != '\0') {
+	bitmask = PvmTaskArch;
+
+	/* If arch is psecified, but not the number of tasks, go and
+	 * count how many hosts of that type there are.
+	 */
+	if (PvmTasks >= 9999) {
+	    PvmTasks = 0;
+	    
+	    for (i = 0; i < nhost; i++) {
+		if (strcmp(PvmArch,hostinfo[i].hi_arch) == 0)
+		    PvmTasks++;
+	    }
+	}    
+    }
+
+    /* If PvmTasks is specified, use that many tasks, otherwise use
+     * as many hosts as possible.
+     */
+    if (PvmTasks >= 9999) {
+	PvmTasks = nhost;
+    }
+
+    /* if no slavename was given, use name of current executable */
+    if(PvmSlavename == NULL)
+	PvmSlavename = argv[0];
+
+    PvmSpawn();						/* spawn the slaves */
+    PvmCheckFirst();					/* wait for first slave */
+
+    pvm_setopt(PvmRoute, PvmRouteDirect);
+
+    /* Max # of pixels in a grid row */
+    PvmChunkWidth = min(PvmChunkWidth, opts.Last_Column - opts.First_Column);
+
+    /* Grid points per line - rounded up */
+    grid_ppline = (opts.Last_Column  - opts.First_Column + PvmChunkWidth - 1) / PvmChunkWidth;
+
+    /* Establish grid section height */
+    PvmChunkHeight = min(PvmChunkHeight, opts.Last_Line - opts.First_Line);
+
+    /* Total grid points in the image - round up PvmChunkHeight */
+    grid_points = ((opts.Last_Line - opts.First_Line + PvmChunkHeight - 1) / PvmChunkHeight) * 
+	grid_ppline;
+    
+    PvmInitSlaveStat();
+    PvmInitFrameStat();
+
+    /* initialize total stats */
+    for(i=0; i < MaxStat; i++) {
+	Init_Counter(totalstats[i]);
+    }
+}
+
+
+
+
+
+/********************************************************************************
+ * Master Control
+ ********************************************************************************/
+
+/*
+ * Receive a message
+ */
+static int PvmMasterReceive() {
+
+    /* wait for a message from the slaves */
+    if ((bufid = pvm_trecv(-1, -1, &wait_time)) < 0) {
+	Error_Line( "PVM Master cannot receive.\n");
+	pvm_perror("");
+	pvm_exit();
+	exit(1);
+    }
+
+    /* We timed out waiting for any messages */
+    if (bufid == 0) {
+	Status_Info(".");
+	fflush(stderr);
+	
+	return 1;
+    }
+    
+    return 0;
+}
+
+/*
+ * Find name and number of slave, of current message
+ */
+static void PvmIdentifySlave() {
+
+    /* get info about this msg. */
+    if (pvm_bufinfo(bufid, &bytesin, &msgtag, &rtid) < 0) {
+	Error_Line( "PVM Master cannot bufinfo.\n");
+	pvm_perror("");
+	pvm_exit();
+	return;
+    }
+
+    /* find the name of the slave, sending the msg. */
+    slave_name = "unknown";
+    for (slave_num = 0; slave_num < PvmTasks; slave_num++) {
+	if (tids[slave_num] == rtid) {
+	    slave_name = slave_stat[slave_num].name;
+	    break;
+	}
+    }
+}
+
+/*
+ * Send a PVM_WORK message
+ * Set block to PVM_GRID_POINT_ASSIGNED
+ */
+static void PvmSendWork(block) 
+    int block;
+{
+    int row_start, row_end, col_start, col_end;
+#ifdef DEBUG
+    Status_Info("Assigning block: %d, frame: %d of %d to %s.\n", block, frame, frames, slave_name);
+#endif /* DEBUG */
+
+    frame_stat[frame].block_stat[block].status = PVM_GRID_POINT_ASSIGNED;
+    frame_stat[frame].block_stat[block].assigned_tid = rtid;
+    
+    row_start = (block/grid_ppline) * PvmChunkHeight + opts.First_Line;
+    row_end   = (row_start + PvmChunkHeight) - 1;
+	    
+    if (row_end >= opts.Last_Line)
+	row_end = opts.Last_Line - 1;
+    
+    col_start = (block%grid_ppline) * PvmChunkWidth + opts.First_Column;
+    col_end   = (col_start + PvmChunkWidth) - 1;
+    
+    if (col_end >= opts.Last_Column)
+	col_end = opts.Last_Column - 1;
+    
+    pvm_initsend(PvmDataDefault);
+    pvm_pkint(&frame,1,1);
+    pvm_pkint(&block,1,1);
+    pvm_pkint(&row_start,1,1);
+    pvm_pkint(&row_end,1,1);
+    pvm_pkint(&col_start,1,1);
+    pvm_pkint(&col_end,1,1);
+    if (pvm_send(rtid, PVM_WORK) < 0) {
+	Error_Line( "PVM Master can't send to slave on %s.\n",slave_name);
+	pvm_perror("");
+	pvm_exit();
+	exit(1);
+    }
+
+    frame_stat[frame].block_to_assign ++;
+}
+
+/*
+ * Send a PVM_WORK message
+ * Set block to PVM_GRID_POINT_REASSIGNED
+ */
+static void PvmReassignWork(block) 
+    int block;
+{
+#ifdef DEBUG
+    Status_Info("Reassigning %d to %s.\n", block,
+		slave_name);
+#endif /* DEBUG */
+    
+    frame_stat[frame].block_stat[block].status=PVM_GRID_POINT_REASSIGNED;
+    frame_stat[frame].block_stat[block].reassigned_tid = rtid;
+    slave_stat[slave_num].block_reassigned = block;
+			
+    if (frame_stat[frame].block_stat[block].wr_line == 0) {
+	row_start = (block / grid_ppline)*PvmChunkHeight +  opts.First_Line;
+    } else {
+	row_start = frame_stat[frame].block_stat[block].wr_line;
+    }
+    row_end = (block/grid_ppline + 1) * PvmChunkHeight - 1;
+    
+    if (row_end >= opts.Last_Line)
+	row_end = opts.Last_Line - 1;
+			
+    col_start = (block % grid_ppline) * PvmChunkWidth +
+	opts.First_Column;
+    col_end   = (col_start + PvmChunkWidth) - 1;
+    
+    if (col_end >= opts.Last_Column)
+	col_end = opts.Last_Column - 1;
+    
+    pvm_initsend(PvmDataDefault);
+    pvm_pkint(&frame,1,1);
+    pvm_pkint(&block,1,1);
+    pvm_pkint(&row_start,1,1);
+    pvm_pkint(&row_end,1,1);
+    pvm_pkint(&col_start,1,1);
+    pvm_pkint(&col_end,1,1);
+    if (pvm_send(rtid, PVM_WORK) < 0) {
+	Error_Line( "PVM Master can't send to slave on %s.\n",slave_name);
+	pvm_perror("");
+	pvm_exit();
+	exit(1);
+    }
+
+    frame_stat[frame].block_to_reassign++;
+}
+
+
+/*	 
+ * Do all the stuff, that is necessary for a new frame 
+ * This is called before the PVM_WORK is sent
+ *
+ * A lot of this is taken from 'FrameRender' 
+ *
+ * ret: 0 .. OK send the PVMWOR 
+ *      1 .. Shellout gave SKIP_ONCE_RET -> this frame is done
+ */
+static int PvmStartFrame() {
+    int Frame_Result;
+
+    if(frame_stat[frame].status != PVM_FRAME_FREE) {
+	Warning(0.0, "Frame %d already started.\n", frame);
+	return 1;
+    }
+
+    if(opts.Options & VERBOSE)
+	Status_Info("\nStarting frame %d...", opts.FrameSeq.InitialFrame + frame);
+    
+    frame_stat[frame].status = PVM_FRAME_WORKING;
+
+    /* allocate row pointers */
+    frame_stat[frame].row_ptr = (COLOUR **)POV_CALLOC(opts.Last_Line, sizeof(COLOUR *), "row_ptr");
+
+    opts.FrameSeq.FrameNumber = opts.FrameSeq.InitialFrame + frame;
+    setup_output_file_name();
+    
+    /* Execute a shell-out command before tracing */
+    Frame_Result = POV_SHELLOUT(PRE_FRAME_SHL);
+    
+    if (Frame_Result == ALL_SKIP_RET) {
+	/* stop completely */
+	int i;
+	for(i=frame; i < frames; i++) {
+	    frame_stat[i].block_to_assign = grid_points;
+	    frame_stat[i].block_to_reassign = grid_points;
+	    frame_stat[i].status = PVM_FRAME_DONE_SHELLOUT;
+	}
+	/* continue searching, frames before this one, should be finished */
+	return 1;		
+    }
+    
+    if (Frame_Result == SKIP_ONCE_RET) {
+	/* mark frame as done */
+	frame_stat[frame].block_to_assign = grid_points;
+	frame_stat[frame].block_to_reassign = grid_points;
+	frame_stat[frame].status = PVM_FRAME_DONE_SHELLOUT;
+
+	/* continue searching */
+	return 1;
+    }
+
+    /*
+     * open output file
+     */
+    set_output_file_handle();
+    open_output_file();
+
+    Initialize_Renderer(); 
+
+    /*
+     * Start displaying
+     */
+    if( (opts.Options & DISPLAY) && !Display_Started)  {
+	Status_Info("\nDisplaying frame %d...", opts.FrameSeq.InitialFrame + frame);
+	POV_DISPLAY_INIT(Frame.Screen_Width, Frame.Screen_Height);
+	Display_Started = TRUE;
+	frame_display = frame;
+	Status_Info("\n");
+    }
+    
+    
+    /*
+     * read already rendered parts
+     */
+    if ((opts.Options & DISKWRITE) && (opts.Options & CONTINUE_TRACE)) {
+	int i;
+	int fl = opts.First_Line;			/* remember start of image */
+	
+	Read_Rendered_Part(Actual_Output_Name);		/* read -> changes opts.First_line */
+
+	frame_stat[frame].row_to_write = 
+	    frame_stat[frame].row_to_malloc = opts.First_Line;
+
+	frame_stat[frame].block_to_write = 
+	    frame_stat[frame].block_to_assign = (opts.First_Line/PvmChunkHeight)*grid_ppline;
+	/* blocks above the new start are already finished */
+	for(i=0; i < frame_stat[frame].block_to_assign; i++) {
+	    frame_stat[frame].block_stat[i].status = PVM_GRID_POINT_WRITTEN;
+	}
+	if(opts.Options & VERBOSE)
+	    Status_Info("Continuing with block %d in frame %d\n", 
+			frame_stat[frame].block_to_assign, frame);
+
+	opts.First_Line = fl;				/* set back the old value */
+
+
+	/* this should not be necessary */
+	if (opts.Last_Line > Frame.Screen_Height)
+	    opts.Last_Line = Frame.Screen_Height;
+	
+	if (opts.Last_Column > Frame.Screen_Width)
+	    opts.Last_Column = Frame.Screen_Width;	
+    }
+
+    /*
+     *  make a copy of the Output_File_Handle 
+     */
+    frame_stat[frame].output_file = Output_File_Handle;
+    if(Output_File_Handle->filename) {
+	char * n = POV_MALLOC(strlen(Output_File_Handle->filename)+1, "filename");
+	strcpy(n, Output_File_Handle->filename);
+	frame_stat[frame].output_file->filename = n;
+    }
+
+    if(opts.Options & VERBOSE)
+	Status_Info("\n");
+
+    return 0;
+}
+
+
+/*
+ * test, if the next frame in the sequence finished,
+ * do all the necessary stuff to close the frame (shellout, ...)
+ */
+static void PvmFinishFrame() {
+
+    /* check, if frame has really finished */
+    if( frame_stat[frame].row_to_write < opts.Last_Line)
+	return;
+
+    /* if not already closed */
+    if( frame_stat[frame].status < PVM_FRAME_DONE) {
+	
+	if(opts.Options & VERBOSE)
+	    Status_Info("\nFinishing frame %d...", opts.FrameSeq.InitialFrame + frame);
+	Status_Info("rtw. %d\n", frame_stat[frame].row_to_write);
+
+	frame_stat[frame].status = PVM_FRAME_DONE;
+	
+	POV_FREE(frame_stat[frame].row_ptr);
+	
+	/* Close output file */
+	if (frame_stat[frame].output_file) {
+	    Output_File_Handle = frame_stat[frame].output_file;
+	    Close_File(frame_stat[frame].output_file);
+	}
+	
+	if( frame == frame_display) {
+	    POV_DISPLAY_FINISHED
+		
+		if ((opts.Options & DISPLAY) && Display_Started)  {
+		    POV_DISPLAY_CLOSE
+	    
+			Display_Started = FALSE;
+		}
+	    
+	    frame_display = -1;
+	}
+	
+	if (opts.histogram_on)
+	    write_histogram (opts.Histogram_File_Name);
+    }
+
+    if( frame_stat[frame].status < PVM_FRAME_DONE_SHELLOUT) {
+	/* the shellouts are done in the correct order */
+	if( frame == next_frame_finish) {
+	    int Frame_Result;
+
+	    frame_stat[frame].status = PVM_FRAME_DONE_SHELLOUT;
+
+	    opts.FrameSeq.FrameNumber = opts.FrameSeq.InitialFrame + frame;
+	    setup_output_file_name();
+	    
+	    Frame_Result = POV_SHELLOUT(POST_FRAME_SHL);
+	    
+	    if ((Frame_Result==SKIP_ONCE_RET) || (Frame_Result==ALL_SKIP_RET)) {
+		next_frame_finish = frames;
+		return;
+	    }
+	    next_frame_finish ++;	/* one more frame finished */
+	    
+	    frame ++;		/* check next frame (might have finished earlier) */
+	    if( frame < frames)
+		PvmFinishFrame();
+	}
+    }
+    if(opts.Options & VERBOSE)
+	Status_Info("\n");	
+}
+
+
+/*
+ * Assign Work
+ *
+ * A slaved requested work, now find free block (or a block to reassign)
+ */
+static void PvmAssignWork() {
+    int min_assigned;
+    int found;
+    int f;
+    
+    /* The slave wants work, but has already been reassigned something,
+     * then tell it to ask again when it really wants work.
+     */
+    if( slave_stat[slave_num].block_reassigned != PVM_SLAVE_FREE) {
+#ifdef DEBUG
+	Status_Info("%s already assigned on %d.  Not reassigning.\n",
+		    slave_name,
+		    slave_stat[slave_num].block_reassigned);
+#endif /* DEBUG */
+	pvm_initsend(PvmDataDefault);
+	pvm_send(rtid, PVM_INIT_SLAVE);
+	
+	return;
+    }
+
+
+    /*
+     * search for a free block, take a frame with minimal
+     * number of assigned blocks
+     */
+    found = 0;
+    min_assigned = grid_points;
+
+    frame = slave_stat[slave_num].frame_assigned;
+    /* if slave was already assigned and that frame has still free blocks */
+    if ( (frame >= 0) &&
+	 (frame_stat[frame].block_to_assign < grid_points) ) {
+	
+	min_assigned = 0;
+	found = 1;
+    }
+    
+    /* find free frame with minimal number of assigned frames */
+    for(f = 0; (f < frames) && (min_assigned > 0); f ++) {
+	if( (frame_stat[f].block_to_assign < min_assigned) &&
+	    (frame_stat[f].block_to_assign < grid_points) ) {
+	    
+#ifdef DEBUG
+	    Status_Info("\nfound: frame %d, ass: %d, min: %d\n", 
+			f, frame_stat[f].block_to_assign,
+			min_assigned);
+#endif
+
+	    min_assigned = frame_stat[f].block_to_assign;
+	    frame = f;
+	    found = 1;
+
+	}
+    }
+
+    if( found ) {
+	/* first block for that frame */
+	if( frame_stat[frame].block_to_assign == 0) {	
+	    /* Do the necessary preparations for a new frame */
+	    if( PvmStartFrame() ) {
+		/* Shellout gave SKIP_ONCE_REt -> search next block */
+		PvmAssignWork();
+		return;
+	    }
+	}
+
+	slave_stat[slave_num].frame_assigned = frame;
+	PvmSendWork(frame_stat[frame].block_to_assign);
+	return;
+    }
+
+
+    /*
+     * found no free block
+     * search for a block to reassign
+     */
+
+    /* if this slave was slow, and there are enough other slaves left,
+       don't use this anymore */
+    if ( (slave_stat[slave_num].pixels_done < npixels_done*9/10/PvmTasks) &&
+	 (minions >= (PvmTasks + 3) / 4) ) {
+    
+	Status_Info("Not using %s for reassignment (%d%%)\n", slave_name,
+		    100*slave_stat[slave_num].pixels_done*PvmTasks/npixels_done);
+
+	/* tell slave to finish work */
+	pvm_initsend(PvmDataDefault);
+	pvm_send(rtid, PVM_STOP_SLAVE);
+    }
+
+    found = 0;
+
+    frame = slave_stat[slave_num].frame_assigned;
+    /* if slave was already assigned and that frame has free blocks */
+    if ( (frame >= 0) &&
+	 (frame_stat[frame].block_to_reassign < grid_points) ) {
+	
+	min_assigned = 0;
+	found = 1;
+    }
+	
+    /* find first frame with minimal number of reassigned frames */
+    min_assigned = grid_points + 1;
+    for(f = 0; (f < frames) && (min_assigned > 0); f ++) {
+	if( frame_stat[f].block_to_reassign < min_assigned) {
+	    
+	    min_assigned = frame_stat[frame].block_to_reassign;
+	    frame = f;
+	    found = 1;
+	}
+    }
+    
+    if( found ) {
+	/* find block in frame */
+	int block;
+	for(block = 0; block < grid_points; block ++) {
+	    if( frame_stat[frame].block_stat[block].status < PVM_GRID_POINT_DONE) {
+		slave_stat[slave_num].frame_reassigned = frame;
+		PvmReassignWork(block);
+		return;
+	    }
+	}
+    }
+
+    /* 
+     * there is nothing left to reassign
+     */
+    Status_Info("All blocks are assigned. Stopping %s.\n", slave_name);
+
+    /* tell slave to finish work */
+    pvm_initsend(PvmDataDefault);
+    pvm_send(rtid, PVM_STOP_SLAVE);
+
+}
+
+/*
+ * display a part from one line
+ */
+static void PvmDisplayPlot(row_ptr, row, col, ncols) 
+    COLOUR * row_ptr;
+    int row, col, ncols;
+{
+    unsigned char Red, Green, Blue, Alpha;
+    DBL grey;
+    int i;
+    
+    /* draw line */
+    for (i = col; i < col+ncols; i++) {
+	extract_colors(row_ptr[i], &Red, &Green, &Blue, &Alpha, &grey);
+	POV_DISPLAY_PLOT(i, row, Red, Green, Blue, Alpha);
+    }
+    /* force draw of the whole line (with X11) */
+    i = opts.Last_Column - 1;
+    extract_colors(row_ptr[i], &Red, &Green, &Blue, &Alpha, &grey);
+    POV_DISPLAY_PLOT(i, row, Red, Green, Blue, Alpha);
+}
+
+
+/*
+ * one of the slaves sends a part of it's computed data
+ */
+static void PvmReceiveData() {
+    int ncols;
+    int i;
+    int block;
+    
+    pvm_upkint(&frame, 1, 1);
+    pvm_upkint(&block, 1, 1);
+    pvm_upkint(&row_start, 1, 1);
+    pvm_upkint(&col_start, 1, 1);
+    pvm_upkint(&ncols, 1, 1);
+
+    row_end = row_start + (bytesin - 3*sizeof(int))/(5*ncols*sizeof(COLC));
+    col_end = col_start + ncols;
+
+#ifdef DEBUG
+    Status_Info("receiving frame: %d, row: %d-%d, col: %d-%d\n", 
+		frame, row_start, row_end, col_start, col_end);
+#endif
+
+    /* Make some checks to see if the data is not corrupted or invalid */
+    if( (row_start < opts.First_Line) || (col_start < opts.First_Column) ||
+	(row_end   > opts.Last_Line)  || (col_end   > opts.Last_Column) ||
+	(frame     < 0)               || (frame     >= frames) ||
+	(ncols     > PvmChunkWidth)   || (row_end - row_start > PvmChunkHeight) ) {
+	
+	Warning(0.0, "Bad block recieved from %s\n",slave_name);
+	Warning(0.0, "Frame %d, Row %d - %d, Column %d - %d.\n", frame, row_start, row_end,
+		col_start, col_end);
+	
+	return;
+    }
+    
+    /* get one row after the other */
+    for (i = row_start; i < row_end; i++) {
+	if (i >= frame_stat[frame].block_stat[block].wr_line) {  /* Is incoming data current? */
+
+	    /* allocate memory, to receive data */
+	    if (frame_stat[frame].row_ptr[i] == NULL) { /* Starting a new row */
+		
+		frame_stat[frame].row_ptr[i] = (COLOUR *)POV_MALLOC(opts.Last_Column*sizeof(COLOUR), 
+								    "row_ptr");
+		
+		while(frame_stat[frame].row_ptr[frame_stat[frame].row_to_malloc] != NULL && 
+		      frame_stat[frame].row_to_malloc < opts.Last_Line) {
+		    frame_stat[frame].row_to_malloc++;
+		}
+	    }
+	    
+	    /* get color data */
+	    pvm_upkCOL(&(frame_stat[frame].row_ptr[i][col_start][0]),5*ncols,1);
+	    
+	    frame_stat[frame].block_stat[block].wr_line = i + 1;
+
+	    if (frame == frame_display) {
+		PvmDisplayPlot(frame_stat[frame].row_ptr[i], i, col_start, ncols);
+	    }
+
+	    /* Statistics - Attribute this grid section  */
+	    grid_lines_done++;
+	    slave_stat[slave_num].pixels_done += ncols;
+
+	    npixels_done += ncols;
+	} else {  
+	    /* another slave already sent this data */
+
+	    COLOUR *dummy = (COLOUR *)POV_MALLOC(ncols * sizeof(COLOUR), "dummy row");
+	    pvm_upkCOL(&(dummy[0][0]),5*ncols,1);
+	    
+	    /* Statistics - Attribute this grid section  */
+	    slave_stat[slave_num].pixels_late += ncols;
+	    POV_FREE(dummy);
+	}
+    }
+    /* Has this entire block been rendered? */
+    if (frame_stat[frame].block_stat[block].wr_line >= 
+	(block/grid_ppline + 1)*PvmChunkHeight + opts.First_Line - 1 ||
+	frame_stat[frame].block_stat[block].wr_line >= opts.Last_Line)  {
+#ifdef DEBUG
+	Status_Info("Block completed by %s\n", slave_name);
+#endif /* DEBUG */
+	frame_stat[frame].block_stat[block].status = PVM_GRID_POINT_DONE;
+	if (slave_stat[slave_num].block_reassigned == block) {
+#ifdef DEBUG
+		Status_Info("   reassigned block cleared.\n");
+#endif /* DEBUG */
+		slave_stat[slave_num].block_reassigned = PVM_SLAVE_FREE;
+	}
+#ifdef DEBUG
+	else
+	{
+	    Status_Info("   reassigned block is %d.\n",
+			slave_stat[slave_num].block_reassigned);
+	}
+#endif /* DEBUG */
+    }
+    
+    if ((opts.Options & VERBOSE) && (grid_lines_done % PvmChunkHeight) == 0) {
+	Status_Info("\r%5.2f of blocks complete.",
+		    (float)100*grid_lines_done/PvmChunkHeight/grid_points/frames);
+    }
+}
+
+/*
+ * Write out us many lines as possible 
+ */
+static void PvmWrite() {
+    int i;
+
+    do { 
+	/* check, if there is a complete line to write */
+	for (i = frame_stat[frame].block_to_write; 
+	     i < frame_stat[frame].block_to_write + grid_ppline; i++)	{
+	    if (frame_stat[frame].block_stat[i].wr_line <= frame_stat[frame].row_to_write) {
+#ifdef DEBUG
+		Status_Info("needing block %d in frame %d\n", i, frame); 
+#endif
+		return;
+	    }
+	}
+
+	/* OK, we can write a whole line */
+	if (opts.Options & DISKWRITE) {
+#ifdef DEBUG
+	    Status_Info("write: %d %d\n", frame, frame_stat[frame].row_to_write);
+#endif
+	    Write_Line(frame_stat[frame].output_file,
+		       frame_stat[frame].row_ptr[frame_stat[frame].row_to_write],
+		       frame_stat[frame].row_to_write);
+	}
+
+	/* Still lines to allocate so */
+	if (frame_stat[frame].row_to_malloc < opts.Last_Line)  {
+	    /* move this row buffer down, so we avaoid one malloc/free  */
+	    frame_stat[frame].row_ptr[frame_stat[frame].row_to_malloc] = 
+		frame_stat[frame].row_ptr[frame_stat[frame].row_to_write];
+	    frame_stat[frame].row_ptr[frame_stat[frame].row_to_write] = NULL;
+	    frame_stat[frame].row_to_malloc++;
+	} else {                        /* Otherwise free the row buffer */
+	    POV_FREE(frame_stat[frame].row_ptr[frame_stat[frame].row_to_write]);
+	    frame_stat[frame].row_ptr[frame_stat[frame].row_to_write]= NULL;
+	}
+	
+	frame_stat[frame].row_to_write++;
+	
+#ifndef DEBUG
+	if ((opts.Options & VERBOSE) && (frame_stat[frame].row_to_write % 8) == 0) {
+	    Status_Info("\r%5.2f of blocks complete.",
+			(float)100*grid_lines_done/PvmChunkHeight/grid_points/frames);
+	    Status_Info("  %4d of %4d lines finished (in frame %d).",
+			frame_stat[frame].row_to_write - opts.First_Line, 
+			opts.Last_Line - opts.First_Line, frame);
+	}	
+#endif /* not DEBUG */
+	
+	/* Finished a whole row  of blocks */
+	if ((frame_stat[frame].row_to_write - opts.First_Line) % PvmChunkHeight == 0) {
+	    for (i = frame_stat[frame].block_to_write; 
+		 i < frame_stat[frame].block_to_write + grid_ppline; i++) {
+		frame_stat[frame].block_stat[i].status = PVM_GRID_POINT_WRITTEN;
+	    }
+	    frame_stat[frame].block_to_write += grid_ppline;
+	}
+	
+    } while(frame_stat[frame].block_to_write < grid_points);
+}
+
+/*
+ * Handle slave requests, distribute and collect work
+ */
+void Pvm_Master_Control() {
+
+    /* Wait five minutes at a time between messages */
+    wait_time.tv_sec = 300;
+
+    next_frame_finish = 0;		/* next frame that finishes */
+
+    /* There are incomplete frames and/or incoming messages, and there are any slaves left*/
+    while ( (next_frame_finish < frames) || 
+	    ((pvm_probe(-1, -1) > 0) && (minions > 0))) {
+
+	/* check for user abort */
+	TEST_ABORT;
+	if (Stop_Flag)  {
+	    Render_Info("\nAborting render...\n");
+	    
+	    PvmMasterEnd();
+
+	    if ((opts.Options & DISPLAY) && Display_Started) {
+		POV_DISPLAY_CLOSE;
+	    }	    
+	    if (opts.Do_Stats) {
+		PRINT_STATS(stats);
+	    }
+	    Error("User abort.\n");
+
+	    return;
+	}
+
+	/* receive a request from a slave */
+	if(PvmMasterReceive())
+	    continue;
+
+	PvmIdentifySlave();
+
+#ifdef DEBUG
+	Status_Info("Received msg %d from %s\n", msgtag, slave_name);
+#endif
+
+	/* a slaves requests work */
+	switch(msgtag) {
+	case PVM_INIT_SLAVE:		/* Another slave started ok */
+	    if (opts.Options & VERBOSE) {
+		Status_Info(" Slave %d at %s successfully started.\n", minions, slave_name);
+	    }
+	    minions++;
+	    break;
+
+	case PVM_NEED_WORK:		/* a slave wants work */
+	    PvmAssignWork();
+ 	    break;
+	    
+	case PVM_SLAVE_RESULTS:		/* slaves sends us some data */
+	    PvmReceiveData();
+	    PvmWrite();
+	    PvmFinishFrame();
+	    break;
+	    
+	case PVM_SLAVE_STATS:		/* Too many stats, eh? */
+#ifdef DEBUG
+	    Status_Info("Getting stats from %s.\n", slave_name);
+#endif /* DEBUG */
+	    PvmUnpackStats();
+	    nstat++;
+	    break;
+
+	case PVM_SLAVE_EXIT:		/* Slave has exited. */
+	    Status_Info("\nSlave at %s has exited.\n",slave_name);
+	    
+	    if (--minions <= 0)  {
+		Error_Line( "Error - All slave tasks have exited!\n");
+		pvm_exit();
+		return;
+	    }
+	    break;
+
+	default:			/* something strange happend */
+	    Warning(0.0, "Bad block recieved from %s - message type %4X.\n",
+			slave_name, msgtag);
+	}
+    } /* incomplete frames */
+
+    /* Finished calculating everything */
+    PvmMasterEnd();
+}
+
+/*
+ * Stop PvmMaster
+ */
+static void PvmMasterEnd() {
+    int i;
+
+    /* tell all slave to stop work */
+    for(i=0; i < PvmTasks; i++) {
+	pvm_initsend(PvmDataDefault);
+	pvm_send(tids[i], PVM_STOP_SLAVE);
+    }
+
+    /* Wait a few seconds for lingering stats */
+    wait_time.tv_sec  = 4;
+    wait_time.tv_usec = 0;
+
+    if (opts.Options & VERBOSE)
+	Status_Info("\nWaiting for remaining slave stats.\n");
+
+    /* some incoming stats */
+    while ((bufid = pvm_trecv(-1, PVM_SLAVE_STATS, &wait_time)) > 0)  {
+#ifdef DEBUG
+	int msgtag;
+	if (pvm_bufinfo(bufid, &bytesin, &msgtag, &rtid) < 0) {
+	    Error_Line( "PVM Master cannot bufinfo.\n");
+	    pvm_perror("");
+	    pvm_exit();
+	    return;
+	}
+
+	PvmIdentifySlave();
+
+	Status_Info("Getting stats from %s.\n", slave_name);
+#endif /* DEBUG */
+
+	PvmUnpackStats();
+	nstat++;
+    }
+
+    /* Dump stats for the tasks */
+    Statistics( "\n\nPVM Task Distribution Statistics:\n");
+    Statistics( "%20s  [ done ] [ late ]","host name");
+    Statistics( "%20s  [ done ] [ late ]\n","host name");
+
+    for (i = 0; i < PvmTasks; i++) {
+	int dtid;
+	int j;
+
+	dtid = pvm_tidtohost(tids[i]);
+
+	for (j = 0; j < PvmTasks; j++)	{
+	    if (dtid == hostinfo[j].hi_tid)
+		break;
+	}
+
+	Statistics("%20s  [%5.2f%%] [%5.2f%%]", hostinfo[j].hi_name,
+		   (DBL)slave_stat[i].pixels_done * 100 / npixels_done / frames,
+		   (DBL)slave_stat[i].pixels_late * 100 / npixels_done / frames);
+
+	if (i % 2 == 1)
+	    Statistics("\n");
+    }
+
+    pvm_exit();
+
+    Statistics("\n\nPOV-Ray statistics for finished frames:");
+    if(opts.FrameSeq.FrameType==FT_MULTIPLE_FRAME) {
+	for(i=0; i < next_frame_finish; i++) {
+	    Statistics("\nFrame %d:\n", opts.FrameSeq.InitialFrame + i);
+	    PRINT_STATS(frame_stat[i].stats);
+	}
+	if (opts.Do_Stats) {
+	    Statistics("\n\nTotal statistics:");
+	}
+    }
+
+}
+
+/*
+ * A slave sent some stats
+ */
+static void PvmUnpackStats() {
+    COUNTER tmpStat[MaxStat];
+
+    pvm_upkint(&frame, 1, 1);
+
+    if( pvm_upkSTAT((long*)tmpStat, MaxStat*sizeof(COUNTER)/sizeof(long), 1) >= 0) {
+	int i;
+	COUNTER tmp;
+
+	for(i=0; i < MaxStat; i++) {
+	    /* stats per frame */
+	    Add_Counter(tmp,tmpStat[i],frame_stat[frame].stats[i]);
+	    frame_stat[frame].stats[i] = tmp;
+
+	    /* total stats */
+	    Add_Counter(tmp,tmpStat[i],totalstats[i]);
+	    totalstats[i] = tmp;
+
+	    if(opts.FrameSeq.FrameType != FT_MULTIPLE_FRAME) {
+		Add_Counter(tmp,tmpStat[i],stats[i]);
+		stats[i] = tmp;
+	    }
+	}
+    } else {
+	Error_Line("Unpack Stats.\n");
+	pvm_perror("");
+    }
+}
+
+
+
+/********************************************************************************
+ * Slave Intialization
+ ********************************************************************************/
+
+int Pvm_Slave_Init() {
+    /* Get master TID */
+    PvmMTid = pvm_parent();
+
+    /* Have PVM notify us if the host POV process is killed
+     * or the local PVM daemon dies */
+    pvm_notify(PvmTaskExit, PVM_KILL_SLAVE, 1, &PvmMTid);
+    pvm_setopt(PvmAutoErr, 2);
+    
+    /* Set direct routing */
+    pvm_setopt(PvmRoute, PvmRouteDirect);
+    
+    /* Tell the master we started successfully */
+    pvm_initsend(PvmDataDefault);
+    pvm_send(PvmMTid, PVM_INIT_SLAVE);
+    
+    /* Send an initial work request to the master, so that there is always
+     * an outstanding block assignment, and we don't have to wait for the
+     * master to respond to our request.
+     */
+    pvm_initsend(PvmDataDefault);
+    pvm_send(PvmMTid, PVM_NEED_WORK);
+    
+    NICE(PvmNice);
+    
+    return 0;
+}
+
+
+/********************************************************************************
+ * Slave Control
+ ********************************************************************************/
+
+static void PvmSendStats() {
+    pvm_initsend(PvmDataDefault);
+    pvm_pkint( &frame, 1, 1);
+    pvm_pkSTAT( (long*)stats, MaxStat*sizeof(COUNTER)/sizeof(long), 1);
+    pvm_send(PvmMTid, PVM_SLAVE_STATS);
+}
+
+/*
+ * Request a new block from the master,
+ * handle all messages sent by the master
+ * ret: 0 .. continue with new frame (or exit)
+ *      1 .. continue with this frame (but new region)
+ */
+int Pvm_Slave_Control() {
+
+    struct timeval wait_time;
+    int bufid;
+    unsigned int msgtag;
+    int f;
+    static int first = 1;
+
+    /* Wait up to 5 minutes for a message, otherwise exit */
+    wait_time.tv_sec  = 300;
+    wait_time.tv_usec = 0;
+
+    if((bufid = pvm_trecv(PvmMTid, -1, &wait_time)) == 0) {
+	Error_Line( "Slave timed out waiting for master\n");
+	pvm_exit();
+	exit(1);
+    } else if (bufid < 0) {
+	Error_Line( "Cannot receive message from master.");
+	pvm_perror("");
+	pvm_exit();
+	exit(1);
+    }
+
+    /* We have a block assignment from the master - IGOR SERVES! */
+    if(pvm_bufinfo(bufid, (int *)0, &msgtag, &PvmMTid) < 0) {
+	Error_Line("Cannot get PVM bufinfo\n");
+	pvm_perror("");
+	pvm_exit();
+	exit(1);
+    }
+    
+    switch( msgtag) {
+    case PVM_INIT_SLAVE:
+	pvm_initsend(PvmDataDefault);
+	pvm_send(PvmMTid, PVM_NEED_WORK);
+	break;
+
+    case PVM_WORK:
+	/* Ask master for some more block assignments in advance
+	 * to avoid waiting for them to be sent later
+	 */
+	pvm_initsend(PvmDataDefault);
+	pvm_send(PvmMTid, PVM_NEED_WORK);
+
+	/* Unpack the message */
+	pvm_upkint(&f, 1, 1);
+	pvm_upkint(&PvmBlockNum, 1, 1);
+	pvm_upkint(&opts.First_Line, 1, 1);
+	pvm_upkint(&opts.Last_Line, 1, 1);
+	pvm_upkint(&opts.First_Column, 1, 1);
+	pvm_upkint(&opts.Last_Column, 1, 1);
+
+	/* Last_Line is really "number of lines to do" */
+	opts.Last_Line++;
+
+	/* Send the data every 1/4 of a block */
+	PvmRowsToSend = (opts.Last_Line - opts.First_Line + 3) / 4;
+
+	/* Last_Column is really "number of columns to do" */
+	opts.Last_Column++;
+	
+	/* check, if a new frame starts */
+	if(frame != f) {
+	    if(!first)
+		PvmSendStats();
+	    first = 0;
+	    PvmNextFrame = opts.FrameSeq.InitialFrame + f;
+	    frame = f;
+	    return 0;		/* stop with this frame */
+	}
+	
+	/* We need to do this for every block */
+	Initialize_Renderer();
+	
+	return 1;		/* still the same frame */
+
+    case PVM_STOP_SLAVE:	/* Everything is done, send stats and exit */
+	PvmSendStats();
+	PvmNextFrame = opts.FrameSeq.FinalFrame + 1;
+	return 0;
+
+    case PVM_KILL_SLAVE:
+	Error_Line("\nSlave killed because of dead master.\n");
+	pvm_exit();
+	exit(1);
+
+    default: /* Unknown message */
+	Error_Line("\nUnknown control message from master - %X\n",msgtag);
+	pvm_initsend(PvmDataDefault);
+	pvm_send(PvmMTid,PVM_NEED_WORK);  /* Request work again */
+    }
+    return 0;
+}
+
+void Pvm_Slave_Exit() {
+    pvm_initsend(PvmDataDefault);
+    pvm_send(PvmMTid, PVM_SLAVE_EXIT);
+    pvm_exit();
+}
+
+void Pvm_Write_Line(handle, line_data, line_number)
+    FILE_HANDLE     *handle;
+    COLOUR          *line_data;
+    int             line_number;
+{
+    static int in_buffer = 0;
+    static int ncols;
+
+    if (in_buffer == 0) /* No lines written yet. Initialize buffer */
+    {
+	ncols = opts.Last_Column - opts.First_Column;
+	pvm_initsend(PvmDataDefault);
+
+	/* Insert block info into message */
+	pvm_pkint(&frame, 1, 1);
+	pvm_pkint(&PvmBlockNum, 1, 1);
+	pvm_pkint(&line_number, 1, 1);
+	pvm_pkint(&opts.First_Column, 1, 1);
+	pvm_pkint(&ncols, 1, 1);
+    }
+
+    if (pvm_pkCOL(&(line_data[opts.First_Column][0]),5*ncols, 1) < 0) {
+	Error_Line( "Cannot pack in Pvm_Write_Line\n");
+	pvm_perror("");
+	if (in_buffer > 0) {
+	    pvm_send(PvmMTid, PvmBlockNum);  /* Send any lines we have done. */
+	}
+	pvm_initsend(PvmDataDefault);
+	pvm_send(PvmMTid, PVM_SLAVE_EXIT); /* Tell the master we're dying */
+	pvm_exit();
+	return;
+    }
+
+    in_buffer++;
+    
+    if (in_buffer >= PvmRowsToSend || line_number >= opts.Last_Line - 1) {
+	if (pvm_send(PvmMTid, PVM_SLAVE_RESULTS) < 0) { 
+	    Error_Line( "Cannot send block in Pvm_Write_Line\n");
+	    pvm_perror("");
+	    pvm_exit();
+	    return;
+	}
+
+	in_buffer = 0;
+    }
+} 
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff -Naur source.ori/pvm.h source/pvm.h
--- source.ori/pvm.h	Thu Jan  1 01:00:00 1970
+++ source/pvm.h	Sun Sep 12 00:25:35 1999
@@ -0,0 +1,164 @@
+/****************************************************************************
+*  pvm.h
+*
+*  This include module is used by PVM control routines in the PVM'd PovRAY.
+*
+*  This file was written by Brad Kline.  April 1994.
+*                modified by Andreas Dilger,  Feb 1995.
+*                modified by Harald Deischinger, 1996 - April 1997
+*                modified by Jakob Flierl, May 1999
+* 
+*  All the defines that need modification are at the top.
+*
+*  The author disclaims all warranties with regard to this software, 
+*  including all implied warranties of merchant-ability and fitness. 
+*  The code is simply distributed as it is.
+*
+*
+*****************************************************************************/
+
+/* If setpriority() doesn't exist on your system, you should change 
+ * "your_pvm_arch" on the following line to whatever your actual PVM_ARCH
+ * is (ie ALPHA or SCO), and please email me to tell me about it, so I can
+ * add it in permanently.
+ */
+
+#include <features.h>
+
+#if defined(SUN4SOL2) || defined(your_pvm_arch)
+
+#define NICE(x) nice(x)
+extern int nice PARAMS((int prio));
+
+#else
+
+/* This should work for the majority of systems */
+
+#define NICE(x) setpriority(PRIO_PROCESS,0,getpriority(PRIO_PROCESS,0)+(x))
+
+#if !(defined __GLIBC__ && __GLIBC__ >= 2)
+extern int setpriority PARAMS((int which, int who, int prio));
+extern int getpriority PARAMS((int which, int who));
+#endif
+#endif
+
+/* How nice to be by default. 0 is the regular job priority, while is 20 very
+ * nice.  The nice value can be changed on the command line, so there is
+ * probably little reason to change it here.
+ */
+#define PVM_DEFAULT_NICE 5
+
+/* On BSD systems, use getwd instead of getcwd.  Change "your_pvm_arch" on
+ * the following line to whatever your actual PVM_ARCH is (ie MIPS or CRAY),
+ * and please email me to tell me about it, so I can add it in permanently.
+ */
+#if defined(NEXT) || defined(your_pvm_arch)
+
+#define GETCWD(path) getwd(path)
+extern char *getwd PARAMS((char *));
+
+#else
+
+#define GETCWD(path) getcwd(path,PATH_MAX+1)
+extern char *getcwd PARAMS((char *, size_t ));
+
+#endif
+
+extern int  chdir PARAMS((const char *path));
+
+/* Grid decomposition defaults */
+#define PVM_DEFAULT_GRID_HEIGHT     32
+#define PVM_DEFAULT_GRID_WIDTH      32
+
+/* what type of encoding to use whan sending pixels */
+#define pvm_upkCOL pvm_upkfloat
+#define pvm_pkCOL pvm_pkfloat
+#define pvm_upkSTAT pvm_upklong
+#define pvm_pkSTAT pvm_pklong
+
+
+/* The maximum path length. _POSIX_PATH_MAX_ = 255 in my limits.h file, but
+ * not all systems have this defined, and my base SUN4 install didn't have
+ * PATH_MAX in <limits.h>.*/
+#ifndef PATH_MAX
+#ifdef _POSIX_PATH_MAX
+#define PATH_MAX _POSIX_PATH_MAX
+#else  /* _POSIX_PATH_MAX doesn't exist.  A safe guess. */
+#define PATH_MAX 1024
+#endif  /* _POSIX_PATH_MAX */ 
+#endif  /* PATH_MAX */ 
+
+/* Structure to hold info about each slave process */
+typedef struct {
+    char *name;
+    int pixels_done;		/* Number of pixels completed */
+    int pixels_late;		/* Number of pixels finished after another slave did it */
+    int block_reassigned;	/* Block number reassigned to this slave */
+    int frame_assigned;		/* assigned to that frame */
+    int frame_reassigned;	/* reassigned to that frame */
+} pvm_slave_stat;
+#define PVM_SLAVE_FREE           -1
+
+/* Structure to hold info about each grid section */
+typedef struct {
+    int status;          /* Current status of block */
+    int wr_line;         /* Line to be written next */
+    int assigned_tid;    /* Tid of the machine assigned to this block */
+    int reassigned_tid;  /* Tid of the machine reassigned to this block */
+} pvm_block_stat;
+/* Status indicators */
+#define PVM_GRID_POINT_FREE       0
+#define PVM_GRID_POINT_ASSIGNED   1
+#define PVM_GRID_POINT_REASSIGNED 2
+#define PVM_GRID_POINT_DONE       3
+#define PVM_GRID_POINT_WRITTEN    4
+
+
+/* Structure to hold info about each frame */
+typedef struct {
+    int status;
+    COLOUR ** row_ptr;
+    int row_to_write;
+    int row_to_malloc;
+    int block_to_assign;
+    int block_to_reassign;
+    int block_to_write;
+    COUNTER stats[MaxStat];		/* PovRay Status */
+    pvm_block_stat * block_stat;
+    FILE_HANDLE* output_file;
+} pvm_frame_stat;
+#define PVM_FRAME_FREE		0
+#define PVM_FRAME_WORKING	1
+#define PVM_FRAME_DONE		2
+#define PVM_FRAME_DONE_SHELLOUT		3
+
+/* Define some message IDs to be used */
+#define PVM_INIT_SLAVE  1
+#define PVM_STOP_SLAVE  2
+#define PVM_KILL_SLAVE  3
+#define PVM_NEED_WORK   4
+#define PVM_SLAVE_EXIT  5
+#define PVM_SLAVE_STATS 6
+#define PVM_SLAVE_RESULTS 7
+#define PVM_WORK	8
+
+/* Prototypes for public functions defined in pvm.c */
+void Pvm_Master_Init PARAMS((int argc, char **argv));
+void Pvm_Master_Control PARAMS((void));
+void Pvm_Write_Line PARAMS((FILE_HANDLE *handle, COLOUR *line, int row));
+int  Pvm_Slave_Init PARAMS((void));
+int  Pvm_Slave_Control PARAMS((void));
+void Pvm_Slave_Exit PARAMS((void));
+
+extern char     PvmArch[];
+extern int      PvmChunkWidth;
+extern int      PvmChunkHeight;
+extern int      PvmSlave;
+extern int      PvmTasks;
+extern int      PvmNice;
+extern char *	PvmSlavename;
+extern int	PvmNextFrame;
+extern int	PvmBlockNum;
+extern char	PvmWorkingDir[];
+extern char **  PvmHosts;
+extern int	PvmHostsN;
diff -Naur source.ori/render.c source/render.c
--- source.ori/render.c	Sat Jun 30 01:49:21 2001
+++ source/render.c	Sat Jun 30 10:08:01 2001
@@ -46,7 +46,9 @@
 #include "texture.h"
 #include "vbuffer.h"
 #include "userio.h"
-
+#ifdef USE_PVM
+#include "pvm.h"
+#endif
 
 /*****************************************************************************
 * Local preprocessor defines
@@ -65,6 +67,10 @@
 
 #define SUB_PIXEL_GRID_SIZE 16
 
+#ifdef USE_PVM
+DBL maxclr;
+#endif
+
 /*****************************************************************************
 * Local typedefs
 ******************************************************************************/
@@ -104,7 +110,9 @@
 
 static int SuperSampleCount, RadiosityCount;
 
+#ifndef USE_PVM
 static DBL maxclr;
+#endif
 
 /* Jitter values are taken from [-0.5*JitterScale, 0.5*JitterScale]. */
 
@@ -314,7 +322,9 @@
 static int  create_ray (RAY *ray, DBL x, DBL y, int ray_number);
 static void supersample (COLOUR result, int x, int y);
 static void gamma_correct (COLOUR Colour);
+#ifndef USE_PVM
 static void extract_colors (COLOUR Colour, unsigned char *Red, unsigned char *Green, unsigned char *Blue, unsigned char *Alpha, DBL *grey);
+#endif
 static void trace_pixel (int x, int y, COLOUR Colour);
 static void initialise_histogram (void) ;
 static void accumulate_histogram (int x, int y, int on);
@@ -349,7 +359,8 @@
 *
 * CHANGES
 *
-*   -
+*   Oct 1996: Added support for PVM [Deischi]
+*   Jun 2001: Added conditional build for PVM Support [Agaran]
 *
 ******************************************************************************/
 
@@ -368,6 +379,12 @@
 
   size = (Frame.Screen_Width + 1) * sizeof(COLOUR);
 
+#ifdef USE_PVM
+  /*  looks like normal mem leak,  maybe that should be always enabled? */
+  if (Previous_Line!=NULL) POV_FREE(Previous_Line);
+  if (Current_Line!=NULL) POV_FREE(Current_Line);
+#endif
+
   Previous_Line = (COLOUR *)POV_MALLOC(size, "previous line buffer");
   Current_Line  = (COLOUR *)POV_MALLOC(size, "current line buffer");
 
@@ -381,6 +398,12 @@
   {
     size = (Frame.Screen_Width + 1) * sizeof(char);
 
+#ifdef USE_PVM
+    /* again looks like memleak fixup... */
+    if (Previous_Line_Antialiased_Flags!=NULL) POV_FREE(Previous_Line_Antialiased_Flags);
+    if (Current_Line_Antialiased_Flags!=NULL) POV_FREE(Current_Line_Antialiased_Flags);
+#endif
+    
     Previous_Line_Antialiased_Flags = (char *)POV_MALLOC(size, "previous line flags");
     Current_Line_Antialiased_Flags  = (char *)POV_MALLOC(size, "current line flags");
 
@@ -390,6 +413,11 @@
       Current_Line_Antialiased_Flags[i]  = 0;
     }
   }
+#ifdef USE_PVM
+  /* If PVM, this is already enough */
+  if(PvmTasks && !PvmSlave)
+      return;
+#endif
 
   Assign_Vector(Camera_Ray.Initial, Frame.Camera->Location);
 
@@ -3154,8 +3182,11 @@
 *   Jun 1995 : Alpha channel support -CEY
 *
 ******************************************************************************/
-
+#ifdef USE_PVM
+void extract_colors(COLOUR Colour, unsigned char *Red, unsigned char  *Green, unsigned char  *Blue, unsigned char  *Alpha, DBL *grey)
+#else
 static void extract_colors(COLOUR Colour, unsigned char *Red, unsigned char  *Green, unsigned char  *Blue, unsigned char  *Alpha, DBL *grey)
+#endif
 {
   if (opts.PaletteOption == GREY)
   {
diff -Naur source.ori/render.h source/render.h
--- source.ori/render.h	Sat Jun 30 01:49:21 2001
+++ source/render.h	Sat Jun 30 03:18:56 2001
@@ -59,6 +59,9 @@
 extern unsigned long              *histogram_grid ;
 extern unsigned long              max_histogram_value ;
 extern FILE_HANDLE                *Histogram_File_Handle ;
+#ifdef USE_PVM
+extern DBL                        maxclr;
+#endif
 
 /*****************************************************************************
 * Global functions
@@ -74,6 +77,10 @@
 DBL  Trace (RAY *Ray, COLOUR Colour, DBL Weight);
 void Check_User_Abort (int Do_Stats);
 void write_histogram (char *filename);
+#ifdef USE_PVM
+void extract_colors (COLOUR Colour, unsigned char *Red, unsigned char *Green, unsigned char *Blue, unsigned char *Alpha, DBL *grey);
+#endif
+
 void destroy_histogram (void);
 
 #endif
diff -Naur source.ori/unix/makefile source/unix/makefile
--- source.ori/unix/makefile	Sat Jun 30 03:02:03 2001
+++ source/unix/makefile	Sat Jun 30 11:54:57 2001
@@ -53,7 +53,7 @@
 #CFLAGS      = -O6 -finline-functions -ffast-math -c -ansi -m386 -DCPU=586 -DCOMPILER_VER=\".`uname`.$(CC)\" -DPOV_LIB_DIR=\"$(POVLIBDIR)\" $(SRCINC) $(LIBPNGINC) $(ZLIBINC)
 
 # Linux compiler flags, Pentium II optimized
-CFLAGS      = $(OPT_FLAGS) -finline-functions -ffast-math -c -ansi -DCOMPILER_VER=\".`uname`.$(CC)\" -DPOV_LIB_DIR=\"$(POVLIBDIR)\" $(SRCINC)
+CFLAGS      = $(OPT_FLAGS) $(PVMFLAGS) -finline-functions -ffast-math -c -ansi -DCOMPILER_VER=\".`uname`.$(CC)\" -DPOV_LIB_DIR=\"$(POVLIBDIR)\" $(SRCINC)
 
 # HPUX compiler flags
 #CFLAGS      = +O2 -finline-functions -c -Aa -D_HPUX_SOURCE -DCOMPILER_VER=\".`uname`.$(CC)\" $(SRCINC) $(LIBPNGINC) $(ZLIBINC)
@@ -149,12 +149,15 @@
 
 # UTARGET is the name of the text-only UNIX version
 UTARGET=povray
+UTARGET_PVM=pvmpov
 
 # XTARGET is the name of the X-Windows executable.
 XTARGET=x-povray
+XTARGET_PVM=x-pvmpov
 
 # STARGET is the name of the SVGA executable.
 STARGET=s-povray
+STARGET_PVM=s-pvmpov
 
 # This is the suffix for object files.
 OBJ     = .o
@@ -167,6 +170,13 @@
 
 SRCINC  = -I. -I$(SRCDIR)
 
+# not needed
+#PVMINC		= -I$(PVM_ROOT)/include
+#PVMLIB		= /usr/lib/libpvm3.a /usr/lib/libgpvm3.a	
+PVMLIB		= -lpvm3
+# dunno for what that is used
+XDIR		= $(HOME)/pvm3/bin/$(PVM_ARCH) 
+
 #
 # End of user specific options
 #
@@ -1526,6 +1536,12 @@
                           xpovmask.xbm         \
                           $(SRCDIR)/povproto.h
 
+pvmDEP                  = $(SRCDIR)/pvm.c      \
+                          config.h             \
+                          $(SRCDIR)/pvm.h
+#                          $(UNIXDIR)/unixconf.h
+
+
 config.h:
 	@echo
 	@echo 'You need to select which executable version you want'
@@ -1549,46 +1565,89 @@
 unix:	$(UTARGET)
 	@echo
 
+unix_pvm:	$(UTARGET_PVM)
+	@echo
+
 $(UTARGET):	$(POVOBJS) $(ODIR)/unix$(OBJ)
 	$(CC) $(POVOBJS) $(ODIR)/unix$(OBJ) $(LFLAGS) -o $(UTARGET)
 
+$(UTARGET_PVM):	$(POVOBJS) $(ODIR)/pvm$(OBJ) $(ODIR)/unix$(OBJ)
+	$(CC) $(POVOBJS) $(ODIR)/unix$(OBJ) $(ODIR)/pvm$(OBJ) $(PVMLIB) $(LFLAGS) -o $(UTARGET_PVM)
+
 svga:	$(STARGET)
 	@echo
 
+svga_pvm:	$(STARGET_PVM)
+	@echo
+
+
 $(STARGET):	$(POVOBJS) $(ODIR)/svga$(OBJ) $(ODIR)/unix$(OBJ)
 	$(CC) $(POVOBJS) $(ODIR)/svga$(OBJ) $(ODIR)/unix$(OBJ) $(LFLAGS) $(SLIBLIB) -o $(STARGET)
 
+$(STARGET_PVM):	$(POVOBJS) $(ODIR)/svga$(OBJ) $(ODIR)/pvm$(OBJ) $(ODIR)/unix$(OBJ)
+	$(CC) $(POVOBJS) $(ODIR)/svga$(OBJ) $(ODIR)/unix$(OBJ) $(ODIR)/pvm$(OBJ) $(PVMLIB) $(LFLAGS) $(SLIBLIB) -o $(STARGET_PVM)
+
 xwin:	$(XTARGET)
 	@echo
 
+xwin_pvm:	$(XTARGET_PVM)
+	@echo
+
 $(XTARGET):	$(POVOBJS) $(ODIR)/xwindows$(OBJ) $(ODIR)/unix$(OBJ)
 	$(CC) $(POVOBJS) $(ODIR)/xwindows$(OBJ) $(ODIR)/unix$(OBJ) $(LFLAGS) $(XLIBLIB) -o $(XTARGET)
 
+$(XTARGET_PVM):	$(POVOBJS) $(ODIR)/xwindows$(OBJ) $(ODIR)/pvm$(OBJ) $(ODIR)/unix$(OBJ)
+	$(CC) $(POVOBJS) $(ODIR)/xwindows$(OBJ) $(ODIR)/unix$(OBJ) $(ODIR)/pvm$(OBJ) $(PVMLIB) $(LFLAGS) $(XLIBLIB) -o $(XTARGET_PVM)
+
+
 # Only these files need to be rebuilt if the display type was changed
 DISPOBJS = $(ODIR)/povray$(OBJ) $(ODIR)/render$(OBJ) \
            $(ODIR)/userio$(OBJ) $(ODIR)/vbuffer$(OBJ)
 
+PVMOBJ = $(ODIR)/optin$(OBJ) $(ODIR)/optout$(OBJ) $(ODIR)/povray$(OBJ) $(ODIR)render$(OBJ)
+
 newunix:
-	-@$(RM) $(DISPOBJS)
+	-@$(RM) $(DISPOBJS) $(PVMOBJ)
 	-@cp unixconf.h config.h
 	-@touch -c $(ODIR)/*$(OBJ)
 	-@$(MAKE) unix
 
+newunix_pvm:
+	-@$(RM) $(DISPOBJS) $(PVMOBJ)
+	-@cp unixconf.h config.h
+	-@touch -c $(ODIR)/*$(OBJ)
+	-@$(MAKE) PVMFLAGS="-DUSE_PVM" unix_pvm
+
+
 newsvga:
-	-@$(RM) $(DISPOBJS)
+	-@$(RM) $(DISPOBJS) $(PVMOBJ)
 	-@cp svgaconf.h config.h
 	-@touch -c $(ODIR)/*$(OBJ)
 	-@$(MAKE) svga
 
+newsvga_pvm:
+	-@$(RM) $(DISPOBJS) $(PVMOBJ)
+	-@cp svgaconf.h config.h
+	-@touch -c $(ODIR)/*$(OBJ)
+	-@$(MAKE) PVMFLAGS="-DUSE_PVM" svga_pvm
+
 newxwin:
-	-@$(RM) $(DISPOBJS)
+	-@$(RM) $(DISPOBJS) $(PVMOBJ)
 	-@cp xwinconf.h config.h
 	-@touch -c $(ODIR)/*$(OBJ)
 	-@$(MAKE) xwin
 
+newxwin_pvm:
+	-@$(RM) $(DISPOBJS) $(PVMOBJ)
+	-@cp xwinconf.h config.h
+	-@touch -c $(ODIR)/*$(OBJ)
+	-@$(MAKE) PVMFLAGS="-DUSE_PVM" xwin_pvm
+
+
 clean:
-	-@$(RM) $(POVOBJS) $(ODIR)/unix$(OBJ) $(ODIR)/xwindows$(OBJ)
-	-@$(RM) $(ODIR)/svga$(OBJ) $(UTARGET) $(XTARGET) $(STARGET)
+	-@$(RM) $(POVOBJS) pvm$(OBJ) $(ODIR)/unix$(OBJ) $(ODIR)/xwindows$(OBJ)
+	-@$(RM) $(ODIR)/svga$(OBJ) $(UTARGET) $(XTARGET) $(STARGET) $(UTARGET_PVM) 
+	-@$(RM) $(XTARGET_PVM) $(STARGET_PVM) 
 
 install:
 	-@cp povray.1 $(POVPATH)/man/man1
@@ -1821,17 +1880,7 @@
 $(ODIR)/xwindows$(OBJ) : $(xwindowsDEP)
 	$(CC) $(CFLAGS) $(XLIBINC) xwindows.c
 
-
-
-
-
-
-
-
-
-
-
-
-
+$(ODIR)/pvm$(OBJ) : $(pvmDEP)
+	$(CC) $(CFLAGS) $(SRCDIR)/pvm.c