--- ray/src/cv/mgflib/mgf2inv.c	1995/12/05 10:59:27	1.4
+++ ray/src/cv/mgflib/mgf2inv.c	2003/07/27 22:12:02	1.9
@@ -1,9 +1,6 @@
-/* Copyright (c) 1995 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: mgf2inv.c,v 1.9 2003/07/27 22:12:02 schorsch Exp $";
 #endif
-
 /*
  * Convert MGF to Inventor file.
  *
@@ -12,17 +9,21 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include <stdio.h>
 
+#include <stdlib.h>
+
 #include <math.h>
 
 #include <ctype.h>
 
+#include <string.h>
+
 #include "parser.h"
 
 #include "lookup.h"
 
 #define O_INV1		1	/* Inventor 1.0 output */
 #define O_INV2		2	/* Inventor 2.0 output */
-#define O_VRML		3	/* VRML output */
+#define O_VRML1		3	/* VRML 1.0 output */
 
 #define MAXID		48	/* maximum identifier length */
 
@@ -97,7 +98,7 @@ char	*argv[];
 				/* get options and print format line */
 	for (i = 1; i < argc && argv[i][0] == '-'; i++)
 		if (!strcmp(argv[i], "-vrml"))
-			outtype = O_VRML;
+			outtype = O_VRML1;
 		else if (!strcmp(argv[i], "-1"))
 			outtype = O_INV1;
 		else if (!strcmp(argv[i], "-2"))
@@ -111,8 +112,8 @@ char	*argv[];
 	case O_INV2:
 		printf("#Inventor V2.0 ascii\n");
 		break;
-	case O_VRML:
-		printf("#VRML 1.0 ascii\n");
+	case O_VRML1:
+		printf("#VRML V1.0 ascii\n");
 		break;
 	}
 	printf("## Translated from MGF Version %d.%d\n", MG_VMAJOR, MG_VMINOR);
@@ -458,7 +459,7 @@ char	**av;
 	if (put_material() < 0)
 		return(MG_EBADMAT);
 				/* get endpoints */
-	if ((v1 = c_getvert(av[1])) == NULL | (v2 = c_getvert(av[3])) == NULL)
+	if (((v1 = c_getvert(av[1])) == NULL) | ((v2 = c_getvert(av[3])) == NULL))
 		return(MG_EUNDEF);
 				/* get radius */
 	if (!isflt(av[2]))
@@ -468,7 +469,12 @@ 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]));