--- ray/src/rt/source.c	2006/07/12 05:47:05	2.54
+++ ray/src/rt/source.c	2010/08/23 15:56:17	2.58
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: source.c,v 2.54 2006/07/12 05:47:05 greg Exp $";
+static const char RCSid[] = "$Id: source.c,v 2.58 2010/08/23 15:56:17 greg Exp $";
 #endif
 /*
  *  source.c - routines dealing with illumination sources.
@@ -86,7 +86,13 @@ marksources(void)			/* find and mark source objects */
 			continue;
 					/* find material */
 		m = findmaterial(objptr(o->omod));
-		if (m == NULL || !islight(m->otype))
+		if (m == NULL)
+			continue;
+		if (m->otype == MAT_CLIP) {
+			markclip(m);	/* special case for antimatter */
+			continue;
+		}
+		if (!islight(m->otype))
 			continue;	/* not source modifier */
 	
 		if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 :
@@ -300,11 +306,13 @@ sourcehit(			/* check to see if ray hit distant source
 		 * If it's a glow or transparent illum, just remember it.
 		 */
 		if (source[i].sflags & SSKIP) {
-			glowsrc = i;
+			if (glowsrc < 0)
+				glowsrc = i;
 			continue;
 		}
 		if (transillum(source[i].so->omod)) {
-			transrc = i;
+			if (transrc < 0)
+				transrc = i;
 			continue;
 		}
 		r->ro = source[i].so;	/* otherwise, use first hit */
@@ -403,7 +411,7 @@ direct(					/* add direct component */
 		rayvalue(&sr);
 		multcolor(sr.rcol, sr.rcoef);
 		copycolor(scp->val, sr.rcol);
-		cntord[sn].brt = intens(sr.rcol);
+		cntord[sn].brt = bright(sr.rcol);
 	}
 						/* sort contributions */
 	qsort(cntord, sn, sizeof(CNTPTR), cntcmp);
@@ -457,7 +465,6 @@ direct(					/* add direct component */
 			raycont(&sr);
 			if (trace != NULL)
 				(*trace)(&sr);	/* trace execution */
-			rayparticipate(&sr);
 			if (bright(sr.rcol) <= FTINY) {
 #if SHADCACHE
 				if ((scp <= srccnt || scp[-1].sno != scp->sno)
@@ -467,6 +474,7 @@ direct(					/* add direct component */
 #endif
 				continue;	/* missed! */
 			}
+			rayparticipate(&sr);
 			multcolor(sr.rcol, sr.rcoef);
 			copycolor(scp->val, sr.rcol);
 		} else if (trace != NULL &&