--- ray/src/rt/rview.c	1991/06/19 16:36:39	1.16
+++ ray/src/rt/rview.c	1991/11/12 17:08:43	2.1
@@ -34,6 +34,9 @@ double  dstrsrc = 0.0;			/* square source distribution
 double  shadthresh = .1;		/* shadow threshold */
 double  shadcert = .25;			/* shadow certainty */
 int  directrelay = 0;			/* number of source relays */
+int  vspretest = 128;			/* virtual source pretest density */
+int  directinvis = 0;			/* sources invisible? */
+double  srcsizerat = 0.;		/* maximum ratio source size/dist. */
 
 int  maxdepth = 4;			/* maximum recursion depth */
 double  minweight = 1e-2;		/* minimum ray weight */
@@ -60,7 +63,7 @@ int  pdepth;				/* image depth in current frame */
 
 static char  *reserve_mem = NULL;	/* pre-allocated reserve memory */
 
-#define RESERVE_AMT	8192		/* amount of memory to reserve */
+#define RESERVE_AMT	32768		/* amount of memory to reserve */
 
 #define  CTRL(c)	('c'-'@')
 
@@ -314,7 +317,7 @@ rsample()			/* sample the image */
 						/* sample the image */
 	for (y = 0; /* y < ysiz */ ; y++) {
 		for (x = 0; x < xsiz-1; x++) {
-			if (dev->inpready)
+			if (dev->inpready || errno == ENOMEM)
 				goto escape;
 			/*
 			 * Test super-pixel to the right.
@@ -330,7 +333,7 @@ rsample()			/* sample the image */
 		if (y >= ysiz-1)
 			break;
 		for (x = 0; x < xsiz; x++) {
-			if (dev->inpready)
+			if (dev->inpready || errno == ENOMEM)
 				goto escape;
 			/*
 			 * Find super-pixel at this position in next row.
@@ -385,7 +388,7 @@ int  pd;
 	if (p->kid == NULL) {			/* subdivide */
 
 		if ((p->kid = newptree()) == NULL)
-			return(growth);
+			return(0);
 		/*
 		 *  The following paint order can leave a black pixel
 		 *  when redraw() is called in (*dev->paintr)().