--- ray/src/gen/mkillum.c	1991/08/13 14:43:49	1.11
+++ ray/src/gen/mkillum.c	1992/07/21 09:45:58	2.4
@@ -30,7 +30,7 @@ char  *rtargv[64] = { "rtrace", "-dj", ".25", "-dr", "
 		"-ab", "2", "-ad", "256", "-as", "128", "-aa", ".15", };
 int  rtargc = 14;
 				/* overriding rtrace options */
-char  *myrtopts[] = { "-I-", "-i-", "-ov", "-h-", "-fff", NULL };
+char  *myrtopts[] = { "-I-", "-i-", "-ov", "-h-", "-fff", "-y", "0", NULL };
 
 struct rtproc	rt;		/* our rtrace process */
 
@@ -42,6 +42,7 @@ struct illum_args  thisillum = {	/* our illum and defa
 		VOIDID,
 		SAMPDENS,
 		NSAMPS,
+		0.,
 	};
 
 char	matcheck[MAXSTR];	/* current material to include or exclude */
@@ -81,8 +82,7 @@ char	*argv[];
 		if (argv[i][0] == '-' && argv[i][1] == 'w')
 			warnings = !warnings;
 	}
-	if ((gargc = i) < 2)
-		error(USER, "too few arguments");
+	gargc = i;
 	rtargc--;
 	for (i = 0; myrtopts[i] != NULL; i++)
 		rtargv[rtargc++] = myrtopts[i];
@@ -101,6 +101,8 @@ char	*argv[];
 		perror(rtpath);
 		exit(1);
 	}
+	if (gargc < 2 || argv[gargc-1][0] == '-')
+		error(USER, "missing octree argument");
 				/* else initialize and run our calculation */
 	init();
 	if (gargc+1 < argc)
@@ -146,6 +148,7 @@ init()				/* start rtrace and set up buffers */
 					/* set up signal handling */
 	signal(SIGPIPE, quit);
 					/* start rtrace process */
+	errno = 0;
 	maxbytes = open_process(rt.pd, rtargv);
 	if (maxbytes == 0) {
 		eputs(rtargv[0]);
@@ -329,6 +332,16 @@ char	*nm;
 				break;
 			cp++;
 			continue;
+		case 'b':			/* brightness */
+			if (*++cp != '=')
+				break;
+			if (!isfltd(++cp, " \t\n"))
+				break;
+			thisillum.minbrt = atof(cp);
+			if (thisillum.minbrt < 0.)
+				thisillum.minbrt = 0.;
+			cp = sskip(cp);
+			continue;
 		case 'o':			/* output file */
 			if (*++cp != '=')
 				break;
@@ -373,9 +386,20 @@ printopts()			/* print out option default values */
 {
 	printf("m=%-15s\t\t# material name\n", thisillum.matname);
 	printf("f=%-15s\t\t# data file name\n", thisillum.datafile);
-	printf("c=n\t\t\t\t# color none\n");
+	if (thisillum.flags & IL_COLAVG)
+		if (thisillum.flags & IL_COLDST)
+			printf("c=d\t\t\t\t# color distribution\n");
+		else
+			printf("c=a\t\t\t\t# color average\n");
+	else
+		printf("c=n\t\t\t\t# color none\n");
+	if (thisillum.flags & IL_LIGHT)
+		printf("l+\t\t\t\t# light type on\n");
+	else
+		printf("l-\t\t\t\t# light type off\n");
 	printf("d=%d\t\t\t\t# density of points\n", thisillum.sampdens);
 	printf("s=%d\t\t\t\t# samples per point\n", thisillum.nsamps);
+	printf("b=%f\t\t\t# minimum average brightness\n", thisillum.minbrt);
 }