--- ray/src/util/findglare.c	1991/04/02 16:47:03	1.14
+++ ray/src/util/findglare.c	1991/04/05 14:26:47	1.15
@@ -12,8 +12,6 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include "glare.h"
 
-#include "random.h"
-
 #define FEQ(a,b)	((a)-(b)<=FTINY&&(a)-(b)<=FTINY)
 #define VEQ(v1,v2)	(FEQ((v1)[0],(v2)[0])&&FEQ((v1)[1],(v2)[1]) \
 				&&FEQ((v1)[2],(v2)[2]))
@@ -292,6 +290,8 @@ compdir(vd, x, y)			/* compute direction for x,y */
 FVECT	vd;
 int	x, y;
 {
+	static int	cury = 10000;
+	static double	err, cmpval;
 	long	t;
 	FVECT	org;			/* dummy variable */
 
@@ -305,9 +305,15 @@ int	x, y;
 				(double)y/(2*sampdens)+.5));
 					/* central region */
 				/* avoid over-counting of poles */
-	t = random() % vsize;
-	if (t*t >= (long)vsize*vsize - (long)y*y)
+	if (cury != y) {
+		err = 0.0;
+		cmpval = sqrt(1.0 - (double)((long)y*y)/((long)vsize*vsize));
+		cury = y;
+	}
+	err += cmpval;
+	if (err <= 0.5)
 		return(-1);
+	err -= 1.0;
 	if (viewray(org, vd, &ourview, .5, (double)y/(2*sampdens)+.5) < 0)
 		return(-1);
 	spinvector(vd, vd, ourview.vup, h_theta(x));