--- ray/src/gen/mkillum.c	1991/07/25 12:52:16	1.7
+++ ray/src/gen/mkillum.c	1992/03/25 10:55:03	2.3
@@ -15,9 +15,10 @@ static char SCCSid[] = "$SunId$ LBL";
 #include  <ctype.h>
 
 				/* default parameters */
-#define  SAMPDENS	128		/* points per projected steradian */
+#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 */
@@ -80,8 +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];
@@ -89,6 +90,7 @@ char	*argv[];
 	rtargv[rtargc] = NULL;
 				/* just asking for defaults? */
 	if (!strcmp(argv[gargc-1], "-defaults")) {
+		printopts(); fflush(stdout);
 		rtpath = getpath(rtargv[0], getenv("PATH"), X_OK);
 		if (rtpath == NULL) {
 			eputs(rtargv[0]);
@@ -99,6 +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)
@@ -144,6 +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]);
@@ -256,6 +261,7 @@ char	*nm;
 				break;
 			if (!*++cp) {
 				strcpy(thisillum.datafile,thisillum.matname);
+				thisillum.dfnum = 0;
 				thisillum.flags &= ~IL_DATCLB;
 				continue;
 			}
@@ -326,6 +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;
@@ -363,6 +379,27 @@ char	*nm;
 	}
 						/* print pure comment */
 	printf("# %s", s+2);
+}
+
+
+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);
+	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);
 }