--- ray/src/rt/aniso.c	2003/03/03 00:10:51	2.36
+++ ray/src/rt/aniso.c	2003/08/28 03:22:16	2.40
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: aniso.c,v 2.36 2003/03/03 00:10:51 greg Exp $";
+static const char RCSid[] = "$Id: aniso.c,v 2.40 2003/08/28 03:22:16 greg Exp $";
 #endif
 /*
  *  Shading functions for anisotropic materials.
@@ -9,6 +9,8 @@ static const char	RCSid[] = "$Id: aniso.c,v 2.36 2003/
 
 #include  "ray.h"
 
+#include  "ambient.h"
+
 #include  "otypes.h"
 
 #include  "func.h"
@@ -318,7 +320,7 @@ register ANISODAT  *np;
 	errno = 0;
 	for (i = 0; i < 3; i++)
 		np->u[i] = evalue(mf->ep[i]);
-	if (errno) {
+	if (errno == EDOM || errno == ERANGE) {
 		objerror(np->mp, WARNING, "compute error");
 		np->specfl |= SP_BADU;
 		return;