--- ray/src/rt/rpict.c	1993/11/24 14:28:08	2.35
+++ ray/src/rt/rpict.c	1994/12/21 09:51:56	2.40
@@ -1,4 +1,4 @@
-/* Copyright (c) 1992 Regents of the University of California */
+/* Copyright (c) 1994 Regents of the University of California */
 
 #ifndef lint
 static char SCCSid[] = "$SunId$ LBL";
@@ -67,6 +67,8 @@ double	srcsizerat = .25;		/* maximum ratio source size
 double	specthresh = .15;		/* specular sampling threshold */
 double	specjitter = 1.;		/* specular sampling jitter */
 
+int  backvis = 1;			/* back face visibility */
+
 int  maxdepth = 6;			/* maximum recursion depth */
 double	minweight = 5e-3;		/* minimum ray weight */
 
@@ -155,7 +157,11 @@ report()		/* report progress */
 	gethostname(hostname, sizeof(hostname));
 #else
 	times(&tbuf);
+#ifdef _SC_CLK_TCK
 	period = 1.0 / sysconf(_SC_CLK_TCK);
+#else
+	period = 1.0 / 60.0;
+#endif
 	u = ( tbuf.tms_utime + tbuf.tms_cutime ) * period;
 	s = ( tbuf.tms_stime + tbuf.tms_cstime ) * period;
 	uname(&nambuf);
@@ -496,7 +502,7 @@ int  xres, y, xstep;
 			b = fillsample(scanline, zline, 0, y, i, 0, b/2);
 		else
 			b = fillsample(scanline+i-xstep,
-					zline ? zline+i-xstep : NULL,
+					zline ? zline+i-xstep : (float *)NULL,
 					i-xstep, y, xstep, 0, b/2);
 		if (sd) *sd++ = nc & 1 ? bl : b;
 		bl = b;
@@ -524,7 +530,7 @@ int  xres, y, ysize;
 			zline[ysize] = zbar[ysize][i];
 		}
 		
-		b = fillsample(vline, zbar[0] ? zline : NULL,
+		b = fillsample(vline, zbar[0] ? zline : (float *)NULL,
 				i, y, 0, ysize, b/2);
 		
 		for (j = 1; j < ysize; j++)
@@ -582,7 +588,8 @@ int  b;
 							/* recurse */
 	ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2);
 	
-	ncut += fillsample(colline+(len>>1), zline ? zline+(len>>1) : NULL,
+	ncut += fillsample(colline+(len>>1),
+			zline ? zline+(len>>1) : (float *)NULL,
 			x+(xlen>>1), y+(ylen>>1),
 			xlen-(xlen>>1), ylen-(ylen>>1), b/2);
 
@@ -597,8 +604,8 @@ int  x, y;			/* pixel position */
 {
 	static RAY  thisray;
 
-	if (viewray(thisray.rorg, thisray.rdir, &ourview,
-			(x+pixjitter())/hres, (y+pixjitter())/vres) < 0) {
+	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview,
+			(x+pixjitter())/hres, (y+pixjitter())/vres)) < -FTINY) {
 		setcolor(col, 0.0, 0.0, 0.0);
 		return(0.0);
 	}
@@ -624,12 +631,12 @@ char  *oldfile;
 	int  x, y;
 
 	if (oldfile == NULL)
-		return(0);
-	
+		goto gotzip;
+
 	if ((fp = fopen(oldfile, "r")) == NULL) {
 		sprintf(errmsg, "cannot open recover file \"%s\"", oldfile);
 		error(WARNING, errmsg);
-		return(0);
+		goto gotzip;
 	}
 #ifdef MSDOS
 	setmode(fileno(fp), O_BINARY);
@@ -642,7 +649,7 @@ char  *oldfile;
 				oldfile);
 		error(WARNING, errmsg);
 		fclose(fp);
-		return(0);
+		goto gotzip;
 	}
 
 	if (x != hres || y != vres) {
@@ -666,6 +673,10 @@ char  *oldfile;
 	fclose(fp);
 	unlink(oldfile);
 	return(y);
+gotzip:
+	if (fflush(stdout) == EOF)
+		error(SYSTEM, "error writing picture header");
+	return(0);
 writerr:
 	sprintf(errmsg, "write error during recovery of \"%s\"", oldfile);
 	error(SYSTEM, errmsg);