--- ray/src/gen/xform.c	1992/09/21 12:15:44	2.6
+++ ray/src/gen/xform.c	1995/12/08 18:29:06	2.10
@@ -1,4 +1,4 @@
-/* Copyright (c) 1992 Regents of the University of California */
+/* Copyright (c) 1995 Regents of the University of California */
 
 #ifndef lint
 static char SCCSid[] = "$SunId$ LBL";
@@ -173,6 +173,7 @@ xform(name, fin)			/* transform stream by tot.xfm */
 char  *name;
 register FILE  *fin;
 {
+	int  nobjs = 0;
 	register int  c;
 
 	while ((c = getc(fin)) != EOF) {
@@ -188,11 +189,16 @@ register FILE  *fin;
 		} else if (c == '!') {			/* command */
 			ungetc(c, fin);
 			xfcomm(name, fin);
+			nobjs++;
 		} else {				/* object */
 			ungetc(c, fin);
 			xfobject(name, fin);
+			nobjs++;
 		}
 	}
+	if (nobjs == 0)
+		fprintf(stderr, "%s: (%s): warning - empty file\n",
+				progname, name);
 }
 
 
@@ -398,10 +404,27 @@ FILE  *fin;
 }
 
 
+m_mist(fin)		/* transform arguments for mist */
+FILE  *fin;
+{
+	FUNARGS	 fa;
+
+	if (readfargs(&fa, fin) != 1)
+		return(-1);
+	if (fa.nsargs != 0  || fa.nfargs != 4)
+		return(-1);
+	printf("0\n0\n4");
+	printf(" %18.12g %18.12g %18.12g", fa.farg[0]/tot.sca,
+			fa.farg[1]/tot.sca, fa.farg[2]/tot.sca);
+	printf(" %18.12g\n", fa.farg[3]);
+	freefargs(&fa);
+	return(0);
+}
+
+
 m_dielectric(fin)		/* transform arguments for dielectric */
 FILE  *fin;
 {
-	double	pow();
 	FUNARGS	 fa;
 
 	if (readfargs(&fa, fin) != 1)
@@ -422,7 +445,6 @@ FILE  *fin;
 m_interface(fin)		/* transform arguments for interface */
 FILE  *fin;
 {
-	double	pow();
 	FUNARGS	 fa;
 
 	if (readfargs(&fa, fin) != 1)
@@ -638,20 +660,6 @@ FILE  *fin;
 
 initotypes()			/* initialize ofun[] array */
 {
-	extern int  o_source();
-	extern int  o_sphere();
-	extern int  o_face();
-	extern int  o_cone();
-	extern int  o_cylinder();
-	extern int  o_ring();
-	extern int  m_glow();
-	extern int  m_spot();
-	extern int  m_dielectric();
-	extern int  m_interface();
-	extern int  text();
-	extern int  alias();
-	extern int  passargs();
-	extern int  addxform();
 	register int  i;
 
 	if (ofun[OBJ_SOURCE].funp == o_source)
@@ -678,11 +686,13 @@ initotypes()			/* initialize ofun[] array */
 	ofun[MAT_SPOT].funp = m_spot;
 	ofun[MAT_DIELECTRIC].funp = m_dielectric;
 	ofun[MAT_INTERFACE].funp = m_interface;
+	ofun[MAT_MIST].funp = m_mist;
 	ofun[PAT_CTEXT].funp =
 	ofun[PAT_BTEXT].funp =
 	ofun[MIX_TEXT].funp = text;
 	ofun[ALIAS].funp = alias;
 					/* surface inverses */
+	tinvers[OBJ_FACE] = OBJ_FACE;
 	tinvers[OBJ_SOURCE] = OBJ_SOURCE;
 	tinvers[OBJ_CONE] = OBJ_CUP;
 	tinvers[OBJ_CUP] = OBJ_CONE;