--- ray/src/common/face.c	1992/10/02 16:02:20	2.2
+++ ray/src/common/face.c	1996/03/22 09:01:16	2.5
@@ -1,4 +1,4 @@
-/* Copyright (c) 1991 Regents of the University of California */
+/* Copyright (c) 1995 Regents of the University of California */
 
 #ifndef lint
 static char SCCSid[] = "$SunId$ LBL";
@@ -27,7 +27,11 @@ static char SCCSid[] = "$SunId$ LBL";
  *  The last vertex is automatically connected to the first.
  */
 
+#ifdef  SMLFLT
+#define  VERTEPS	1e-2		/* allowed vertex error */
+#else
 #define  VERTEPS	1e-4		/* allowed vertex error */
+#endif
 
 
 FACE *
@@ -54,10 +58,15 @@ OBJREC  *o;
 
 	f->va = o->oargs.farg;
 	f->nv = o->oargs.nfargs / 3;
+						/* check for last==first */
+	if (dist2(VERTEX(f,0),VERTEX(f,f->nv-1)) <= FTINY*FTINY)
+		f->nv--;
 						/* compute area and normal */
 	f->norm[0] = f->norm[1] = f->norm[2] = 0.0;
-	v1[0] = v1[1] = v1[2] = 0.0;
-	for (i = 1; i < f->nv; i++) {
+	v1[0] = VERTEX(f,1)[0] - VERTEX(f,0)[0];
+	v1[1] = VERTEX(f,1)[1] - VERTEX(f,0)[1];
+	v1[2] = VERTEX(f,1)[2] - VERTEX(f,0)[2];
+	for (i = 2; i < f->nv; i++) {
 		v2[0] = VERTEX(f,i)[0] - VERTEX(f,0)[0];
 		v2[1] = VERTEX(f,i)[1] - VERTEX(f,0)[1];
 		v2[2] = VERTEX(f,i)[2] - VERTEX(f,0)[2];