--- ray/src/rt/mx_func.c	1998/08/10 18:35:14	2.4
+++ ray/src/rt/mx_func.c	2003/03/05 16:16:53	2.7
@@ -1,15 +1,12 @@
-/* Copyright (c) 1998 Silicon Graphics, Inc. */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ SGI";
+static const char	RCSid[] = "$Id: mx_func.c,v 2.7 2003/03/05 16:16:53 greg Exp $";
 #endif
-
 /*
  *  mx_func.c - routine for mixture functions.
- *
- *     11/2/88
  */
 
+#include "copyright.h"
+
 #include  "ray.h"
 
 #include  "func.h"
@@ -54,7 +51,7 @@ RAY  *r;
 	setfunc(m, r);
 	errno = 0;
 	coef = evalue(mf->ep[0]);
-	if (errno) {
+	if (errno == EDOM || errno == ERANGE) {
 		objerror(m, WARNING, "compute error");
 		return(0);
 	}