--- ray/src/rt/rpict.c	1989/02/02 10:41:36	1.1
+++ ray/src/rt/rpict.c	1989/07/10 15:21:30	1.6
@@ -24,18 +24,19 @@ static char SCCSid[] = "$SunId$ LBL";
 VIEW  ourview = STDVIEW(512);		/* view parameters */
 
 int  psample = 4;			/* pixel sample size */
-
 double  maxdiff = .05;			/* max. difference for interpolation */
-
 double  dstrpix = 0.67;			/* square pixel distribution */
+
 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 = 5e-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 */
@@ -263,6 +264,8 @@ char  *oldfile;
 	getheader(fp, NULL);
 				/* get picture size */
 	if (fscanf(fp, "-Y %d +X %d\n", &y, &x) != 2) {
+		sprintf(errmsg, "bad recover file \"%s\"", oldfile);
+		error(WARNING, errmsg);
 		fclose(fp);
 		return(0);
 	}