--- ray/src/cv/mgflib/mgf2inv.c	1995/12/05 10:34:12	1.3
+++ ray/src/cv/mgflib/mgf2inv.c	1997/03/18 11:05:43	1.6
@@ -16,6 +16,8 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include <ctype.h>
 
+#include <string.h>
+
 #include "parser.h"
 
 #include "lookup.h"
@@ -338,7 +340,7 @@ put_material()			/* put out current material */
 		mgf2rgb(&c_cmaterial->rs_c, c_cmaterial->rs, rgbval);
 		printf("%sspecularColor %.4f %.4f %.4f\n", tabs,
 				rgbval[0], rgbval[1], rgbval[2]);
-		printf("%sshininess %.3f\n", tabs, 1.-c_cmaterial->rs_a);
+		printf("%sshininess %.3f\n", tabs, 1.-sqrt(c_cmaterial->rs_a));
 	}
 	if (c_cmaterial->ed > FTINY) {
 		mgf2rgb(&c_cmaterial->ed_c, 1.0, rgbval);
@@ -468,7 +470,12 @@ char	**av;
 	va[1] = v2->p[1] - v1->p[1];
 	va[2] = v2->p[2] - v1->p[2];
 	length = sqrt(DOT(va,va));
-	angle = acos(va[1]/length);
+	if (va[1] >= length)
+		angle = 0.;
+	else if (va[1] <= -length)
+		angle = PI;
+	else
+		angle = acos(va[1]/length);
 	printf("%sTranslation { translation %13.9g %13.9g %13.9g }\n", tabs,
 			.5*(v1->p[0]+v2->p[0]), .5*(v1->p[1]+v2->p[1]),
 			.5*(v1->p[2]+v2->p[2]));