--- ray/src/rt/rv3.c	2008/08/21 07:05:59	2.22
+++ ray/src/rt/rv3.c	2008/08/29 05:46:03	2.26
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: rv3.c,v 2.22 2008/08/21 07:05:59 greg Exp $";
+static const char	RCSid[] = "$Id: rv3.c,v 2.26 2008/08/29 05:46:03 greg Exp $";
 #endif
 /*
  *  rv3.c - miscellaneous routines for rview.
@@ -25,6 +25,7 @@ static const char	RCSid[] = "$Id: rv3.c,v 2.22 2008/08
 #define  sscanvec(s,v)	(sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3)
 #endif
 
+static unsigned long  niflush;		/* flushes since newimage() */
 
 int
 getrect(				/* get a box */
@@ -145,7 +146,27 @@ greyof(				/* convert color to greyscale */
 	return(gcol);
 }
 
+static void
+recolor(					/* recolor the given node */
+	PNODE *p
+)
+{
+	while (p->kid != NULL) {		/* need to propogate down */
+		int  mx = (p->xmin + p->xmax) >> 1;
+		int  my = (p->ymin + p->ymax) >> 1;
+		int  ki;
+		if (p->x >= mx)
+			ki = (p->y >= my) ? UR : DR;
+		else
+			ki = (p->y >= my) ? UL : DL;
+		pcopy(p, p->kid+ki);
+		p = p->kid + ki;
+	}
 
+	(*dev->paintr)(greyscale?greyof(p->v):p->v,
+			p->xmin, p->ymin, p->xmax, p->ymax);
+}
+
 int
 paint(			/* compute and paint a rectangle */
 	PNODE  *p
@@ -154,6 +175,7 @@ paint(			/* compute and paint a rectangle */
 	extern int  ray_pnprocs;
 	static unsigned long  lastflush = 0;
 	static RAY  thisray;
+	int	flushintvl;
 	double  h, v;
 
 	if (p->xmax - p->xmin <= 0 || p->ymax - p->ymin <= 0) {	/* empty */
@@ -184,18 +206,26 @@ paint(			/* compute and paint a rectangle */
 	copycolor(p->v, thisray.rcol);
 	scalecolor(p->v, exposure);
 
-	(*dev->paintr)(greyscale?greyof(p->v):p->v, p->xmin, p->ymin, p->xmax, p->ymax);
+	recolor(p);				/* paint it */
 
-	if (dev->flush != NULL && raynum - lastflush >= WFLUSH*ray_pnprocs) {
+	if (ambounce <= 0)			/* shall we check for input? */
+		flushintvl = ray_pnprocs*WFLUSH;
+	else if (niflush < WFLUSH)
+		flushintvl = ray_pnprocs*niflush/(ambounce+1);
+	else
+		flushintvl = ray_pnprocs*WFLUSH/(ambounce+1);
+
+	if (dev->flush != NULL && raynum - lastflush >= flushintvl) {
 		lastflush = raynum;
 		(*dev->flush)();
+		niflush++;
 	}
 	return(1);
 }
 
 
 int
-waitrays(void)				/* finish up pending rays */
+waitrays(void)					/* finish up pending rays */
 {
 	int	nwaited = 0;
 	int	rval;
@@ -205,8 +235,7 @@ waitrays(void)				/* finish up pending rays */
 		PNODE  *p = (PNODE *)raydone.rno;
 		copycolor(p->v, raydone.rcol);
 		scalecolor(p->v, exposure);
-		(*dev->paintr)(greyscale?greyof(p->v):p->v,
-				p->xmin, p->ymin, p->xmax, p->ymax);
+		recolor(p);
 		nwaited++;
 	}
 	if (rval < 0)
@@ -249,7 +278,7 @@ newimage(					/* start a new image */
 		ray_popen(nproc);
 		newparam = 0;
 	}
-						/* get first value */
+	niflush = 0;				/* get first value */
 	paint(&ptrunk);
 }