--- ray/src/rt/rv3.c	1990/01/19 00:00:31	1.12
+++ ray/src/rt/rv3.c	1990/06/26 09:00:19	1.16
@@ -18,7 +18,11 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include  "random.h"
 
+#ifndef WFLUSH
+#define WFLUSH		30		/* flush after this many rays */
+#endif
 
+
 getrect(s, r)				/* get a box */
 char  *s;
 register RECT  *r;
@@ -130,9 +134,10 @@ paint(p, xmin, ymin, xmax, ymax)	/* compute and paint 
 register PNODE  *p;
 int  xmin, ymin, xmax, ymax;
 {
+	extern long  nrays;
+	static long  lastflush = 0;
 	static RAY  thisray;
 	double  h, v;
-	register int  i;
 
 	if (xmax - xmin <= 0 || ymax - ymin <= 0) {	/* empty */
 		p->x = xmin;
@@ -141,22 +146,24 @@ int  xmin, ymin, xmax, ymax;
 		return;
 	}
 						/* jitter ray direction */
-	p->x = h = xmin + (xmax-xmin)*frandom();
-	h /= hresolu;
-	p->y = v = ymin + (ymax-ymin)*frandom();
-	v /= vresolu;
+	h = xmin + (xmax-xmin)*frandom();
+	v = ymin + (ymax-ymin)*frandom();
 	
-	viewray(thisray.rorg, thisray.rdir, &ourview, h, v);
-
+	viewray(thisray.rorg, thisray.rdir, &ourview, h/hresolu, v/vresolu);
 	rayorigin(&thisray, NULL, PRIMARY, 1.0);
-	
 	rayvalue(&thisray);
 
+	p->x = h;
+	p->y = v;
 	copycolor(p->v, thisray.rcol);
-
 	scalecolor(p->v, exposure);
 
 	(*dev->paintr)(greyscale?greyof(p->v):p->v, xmin, ymin, xmax, ymax);
+
+	if (dev->flush != NULL && nrays - lastflush >= WFLUSH) {
+		lastflush = nrays;
+		(*dev->flush)();
+	}
 }
 
 
@@ -349,7 +356,7 @@ register VIEW  *vp;
 	} else if (bcmp((char *)vp, (char *)&ourview, sizeof(VIEW))) {
 		copystruct(&oldview, &ourview);
 		copystruct(&ourview, vp);
-		newimage();		/* newimage() calls with vp=&ourview! */
+		newimage();
 	}
 }