--- ray/src/rt/rtrace.c	1989/06/07 21:00:59	1.4
+++ ray/src/rt/rtrace.c	1989/07/10 15:21:28	1.6
@@ -36,13 +36,14 @@ int  vresolu = 0;			/* vertical resolution */
 
 double  dstrsrc = 0.0;			/* square source distribution */
 double  shadthresh = .05;		/* shadow threshold */
+double  shadcert = .5;			/* shadow certainty */
 
 int  maxdepth = 6;			/* maximum recursion depth */
 double  minweight = 4e-3;		/* minimum ray weight */
 
 COLOR  ambval = BLKCOLOR;		/* ambient value */
 double  ambacc = 0.2;			/* ambient accuracy */
-int  ambres = 128;			/* ambient resolution */
+int  ambres = 32;			/* ambient resolution */
 int  ambdiv = 128;			/* ambient divisions */
 int  ambssamp = 0;			/* ambient super-samples */
 int  ambounce = 0;			/* ambient bounces */