--- ray/src/rt/source.c	2005/05/26 06:55:22	2.51
+++ ray/src/rt/source.c	2007/07/25 04:12:36	2.56
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: source.c,v 2.51 2005/05/26 06:55:22 greg Exp $";
+static const char RCSid[] = "$Id: source.c,v 2.56 2007/07/25 04:12:36 greg Exp $";
 #endif
 /*
  *  source.c - routines dealing with illumination sources.
@@ -55,6 +55,10 @@ findmaterial(register OBJREC *o)
 			ao = objptr(aobj);
 			if (ismaterial(ao->otype))
 				return(ao);
+			if (ao->otype == MOD_ALIAS) {
+				o = ao;
+				continue;
+			}
 		}
 		if (o->omod == OVOID)
 			return(NULL);
@@ -82,7 +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 :
@@ -382,7 +392,7 @@ direct(					/* add direct component */
 		scp->sno = sr.rsrc;
 						/* compute coefficient */
 		(*f)(scp->coef, p, sr.rdir, si.dom);
-		cntord[sn].brt = bright(scp->coef);
+		cntord[sn].brt = intens(scp->coef);
 		if (cntord[sn].brt <= 0.0)
 			continue;
 #if SHADCACHE
@@ -399,7 +409,7 @@ direct(					/* add direct component */
 		rayvalue(&sr);
 		multcolor(sr.rcol, sr.rcoef);
 		copycolor(scp->val, sr.rcol);
-		cntord[sn].brt = bright(scp->val);
+		cntord[sn].brt = intens(sr.rcol);
 	}
 						/* sort contributions */
 	qsort(cntord, sn, sizeof(CNTPTR), cntcmp);
@@ -437,7 +447,8 @@ direct(					/* add direct component */
 			break;
 		scp = srccnt + cntord[sn].sndx;
 						/* test for hit */
-		rayorigin(&sr, SHADOW, r, scp->coef);
+		rayorigin(&sr, SHADOW, r, NULL);
+		copycolor(sr.rcoef, scp->coef);
 		VCOPY(sr.rdir, scp->dir);
 		sr.rsrc = scp->sno;
 						/* keep statistics */
@@ -452,7 +463,6 @@ 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)
@@ -462,6 +472,7 @@ direct(					/* add direct component */
 #endif
 				continue;	/* missed! */
 			}
+			rayparticipate(&sr);
 			multcolor(sr.rcol, sr.rcoef);
 			copycolor(scp->val, sr.rcol);
 		} else if (trace != NULL &&