--- ray/src/rt/virtuals.c	1991/06/25 15:48:11	1.11
+++ ray/src/rt/virtuals.c	1991/06/25 16:42:05	1.12
@@ -179,7 +179,7 @@ MAT4  pm;
 		}
 		if (source[sn].sflags & SFLAT) {	/* behind source? */
 			multv3(nsnorm, source[sn].snorm, pm);
-			if (checkspot(&ourspot, nsnorm) < 0)
+			if (!checkspot(&ourspot, nsnorm))
 				return(-1);
 		}
 	}