--- ray/src/rt/raytrace.c	1993/01/26 09:28:00	2.3
+++ ray/src/rt/raytrace.c	1993/05/25 10:30:01	2.6
@@ -25,8 +25,8 @@ extern int  maxdepth;			/* maximum recursion depth */
 extern double  minweight;		/* minimum ray weight */
 extern int  do_irrad;			/* compute irradiance? */
 
-long  raynum = 0L;			/* next unique ray number */
-long  nrays = 0L;			/* number of calls to localhit */
+unsigned long  raynum = 0;		/* next unique ray number */
+unsigned long  nrays = 0;		/* number of calls to localhit */
 
 static FLOAT  Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
 OBJREC  Lamb = {
@@ -34,6 +34,8 @@ OBJREC  Lamb = {
 	{0, 5, NULL, Lambfa}, NULL,
 };					/* a Lambertian surface */
 
+static int  raymove(), checkset(), checkhit();
+
 #define  MAXLOOP	128		/* modifier loop detection */
 
 #define  RAYHIT		(-1)		/* return value for intercepted ray */
@@ -461,6 +463,8 @@ OBJECT  *cxs;
 	checkset(oset, cxs);			/* eliminate double-checking */
 	for (i = oset[0]; i > 0; i--) {
 		o = objptr(oset[i]);
+		if (o->omod == OVOID && issurface(o->otype))
+			continue;		/* ignore void surfaces */
 		(*ofun[o->otype].funp)(o, r);
 	}
 	if (r->ro == NULL)