--- ray/src/gen/mkillum.c	1991/07/25 15:31:30	1.9
+++ ray/src/gen/mkillum.c	1991/11/08 13:17:44	1.14
@@ -18,6 +18,7 @@ static char SCCSid[] = "$SunId$ LBL";
 #define  SAMPDENS	48		/* points per projected steradian */
 #define  NSAMPS		32		/* samples per point */
 #define  DFLMAT		"illum_mat"	/* material name */
+#define  DFLDAT		"illum"		/* data file name */
 				/* selection options */
 #define  S_NONE		0		/* select none */
 #define  S_ELEM		1		/* select specified element */
@@ -36,11 +37,12 @@ struct rtproc	rt;		/* our rtrace process */
 struct illum_args  thisillum = {	/* our illum and default values */
 		0,
 		DFLMAT,
-		DFLMAT,
+		DFLDAT,
 		0,
 		VOIDID,
 		SAMPDENS,
 		NSAMPS,
+		0.,
 	};
 
 char	matcheck[MAXSTR];	/* current material to include or exclude */
@@ -145,6 +147,7 @@ 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]);
@@ -257,6 +260,7 @@ char	*nm;
 				break;
 			if (!*++cp) {
 				strcpy(thisillum.datafile,thisillum.matname);
+				thisillum.dfnum = 0;
 				thisillum.flags &= ~IL_DATCLB;
 				continue;
 			}
@@ -327,6 +331,16 @@ 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;
@@ -369,11 +383,12 @@ char	*nm;
 
 printopts()			/* print out option default values */
 {
-	printf("m=%s\t\t\t# material name\n", thisillum.matname);
-	printf("f=%s\t\t\t# data file name\n", thisillum.datafile);
+	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");
 	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);
 }