--- ray/src/util/rad.c	2010/05/28 17:29:14	2.97
+++ ray/src/util/rad.c	2010/10/09 17:14:01	2.101
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: rad.c,v 2.97 2010/05/28 17:29:14 greg Exp $";
+static const char	RCSid[] = "$Id: rad.c,v 2.101 2010/10/09 17:14:01 greg Exp $";
 #endif
 /*
  * Executive program for oconv, rpict and pfilt
@@ -165,7 +165,7 @@ static int touch(char	*fn);
 static int runcom(char	*cs);
 static int rmfile(char	*fn);
 static int mvfile(char	*fold, char	*fnew);
-static int next_process(void);
+static int next_process(int	reserve);
 static void wait_process(int	all);
 static void finish_process(void);
 static void badvalue(int	vc);
@@ -751,7 +751,7 @@ lowqopts(			/* low quality rendering options */
 		op = addarg(op, "-ds .4");
 	else
 		op = addarg(op, "-ds 0");
-	op = addarg(op, "-dt .2 -dc .25 -dr 0 -sj 0 -st .5");
+	op = addarg(op, "-dt .2 -dc .25 -dr 0 -ss 0 -st .5");
 	if (vdef(AMBFILE)) {
 		sprintf(op, " -af %s", vval(AMBFILE));
 		op += strlen(op);
@@ -826,7 +826,7 @@ medqopts(			/* medium quality rendering options */
 		op = addarg(op, "-ds .2 -dj .9");
 	else
 		op = addarg(op, "-ds .3");
-	op = addarg(op, "-dt .1 -dc .5 -dr 1 -sj .7 -st .1");
+	op = addarg(op, "-dt .1 -dc .5 -dr 1 -ss 1 -st .1");
 	if ( (overture = vint(INDIRECT)) ) {
 		sprintf(op, " -ab %d", overture);
 		op += strlen(op);
@@ -904,7 +904,7 @@ hiqopts(				/* high quality rendering options */
 		op = addarg(op, "-ds .1 -dj .9");
 	else
 		op = addarg(op, "-ds .2");
-	op = addarg(op, "-dt .05 -dc .75 -dr 3 -sj 1 -st .01");
+	op = addarg(op, "-dt .05 -dc .75 -dr 3 -ss 16 -st .01");
 	sprintf(op, " -ab %d", overture=vint(INDIRECT)+1);
 	op += strlen(op);
 	if (vdef(AMBFILE)) {
@@ -1371,7 +1371,7 @@ rpict(				/* run rpict and pfilt for each view */
 				fprintf(fp, "%d %d\n", xdiv, ydiv);
 				fclose(fp);
 			}
-		} else if (next_process()) {
+		} else if (next_process(0)) {
 			if (pfile != NULL)
 				sleep(10);
 			continue;
@@ -1384,8 +1384,7 @@ rpict(				/* run rpict and pfilt for each view */
 				sprintf(combuf, "%s -R %s %s%s %s %s%s%s -o %s %s",
 						c_rpiece, sfile, rppopt, rep, vw,
 						res, opts, po, rawfile, oct1name);
-				while (children_running < nprocs-1 &&
-							next_process()) {
+				while (next_process(1)) {
 					sleep(10);
 					combuf[strlen(c_rpiece)+2] = 'F';
 				}
@@ -1397,33 +1396,27 @@ rpict(				/* run rpict and pfilt for each view */
 		} else {
 			if (overture) {		/* run overture calculation */
 				sprintf(combuf,
-				"%s%s %s%s -x 64 -y 64 -ps 1 %s > %s",
+					"%s%s %s%s -x 64 -y 64 -ps 1 %s > %s",
 						c_rpict, rep, vw, opts,
 						oct1name, overfile);
-				if (do_rpiece)
-					while (children_running < nprocs-1 &&
-							next_process())
-						sleep(5);
-				if (runcom(combuf)) {
-					fprintf(stderr,
+				if (!do_rpiece || !next_process(0)) {
+					if (runcom(combuf)) {
+						fprintf(stderr,
 					"%s: error in overture for view %s\n",
-						progname, vs);
-					quit(1);
-				}
-				if (do_rpiece) {
-					finish_process();
-					wait_process(1);
-				}
+							progname, vs);
+						quit(1);
+					}
 #ifndef NULL_DEVICE
-				rmfile(overfile);
+					rmfile(overfile);
 #endif
+				} else if (do_rpiece)
+					sleep(20);
 			}
 			if (do_rpiece) {
 				sprintf(combuf, "%s -F %s %s%s %s %s%s%s -o %s %s",
 						c_rpiece, sfile, rppopt, rep, vw,
 						res, opts, po, rawfile, oct1name);
-				while (children_running < nprocs-1 &&
-							next_process())
+				while (next_process(1))
 					sleep(10);
 			} else {
 				sprintf(combuf, "%s%s %s %s%s%s%s %s > %s",
@@ -1554,7 +1547,7 @@ mvfile(		/* move a file */
 
 #ifdef RHAS_FORK_EXEC
 static int
-next_process(void)			/* fork the next process (max. nprocs) */
+next_process(int reserve)		/* fork the next process */
 {
 	RT_PID	child_pid;
 
@@ -1565,12 +1558,15 @@ next_process(void)			/* fork the next process (max. np
 				progname);
 		quit(1);
 	}
+	if (reserve > 0 && children_running >= nprocs-reserve)
+		return(0);		/* caller holding back process(es) */
 	if (children_running >= nprocs)
 		wait_process(0);	/* wait for someone to finish */
 	fflush(NULL);			/* flush output */
 	child_pid = fork();		/* split process */
 	if (child_pid == 0) {		/* we're the child */
 		children_running = -1;
+		nprocs = 1;
 		return(0);
 	}
 	if (child_pid > 0) {		/* we're the parent */
@@ -1612,7 +1608,7 @@ wait_process(			/* wait for process(es) to finish */
 }
 #else	/* ! RHAS_FORK_EXEC */
 static int
-next_process(void)
+next_process(int reserve)
 {
 	return(0);			/* cannot start new process */
 }