--- ray/src/rt/source.c	1991/06/25 12:32:51	1.37
+++ ray/src/rt/source.c	1991/07/11 16:39:03	1.39
@@ -86,6 +86,12 @@ marksources()			/* find and mark source objects */
 			source[ns].sflags |= SSPOT;
 			if ((source[ns].sl.s = makespot(m)) == NULL)
 				goto memerr;
+			if (source[ns].sflags & SFLAT &&
+				!checkspot(source[ns].sl.s,source[ns].snorm)) {
+				objerror(o, WARNING,
+					"invalid spotlight direction");
+				source[ns].sflags |= SSKIP;
+			}
 		}
 	}
 	if (nsources <= 0) {
@@ -146,7 +152,7 @@ register int  sn;		/* source number */
 		for (i = 0; i < 3; i++) {
 			dimlist[ndims] = i + 8831;
 			vd[i] = dstrsrc * source[sn].ss *
-		(1.0 - 2.0*urand(ilhash(dimlist,ndims+1)+samplendx));
+		(1.0 - 2.0*urand(urind(ilhash(dimlist,ndims+1),samplendx)));
 		}
 		ndims--;
 		if (source[sn].sflags & SFLAT) {	/* project offset */