--- ray/src/rt/glass.c	1996/06/06 10:23:28	2.9
+++ ray/src/rt/glass.c	2005/04/19 01:15:06	2.16
@@ -1,18 +1,15 @@
-/* Copyright (c) 1991 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char RCSid[] = "$Id: glass.c,v 2.16 2005/04/19 01:15:06 greg Exp $";
 #endif
-
 /*
  *  glass.c - simpler shading function for thin glass surfaces.
- *
- *     11/14/86
  */
 
-#include  "ray.h"
+#include "copyright.h"
 
+#include  "ray.h"
 #include  "otypes.h"
+#include  "rtotypes.h"
 
 /*
  *  This definition of glass provides for a quick calculation
@@ -44,9 +41,11 @@ static char SCCSid[] = "$SunId$ LBL";
 #define  RINDEX		1.52		/* refractive index of glass */
 
 
-m_glass(m, r)		/* color a ray which hit a thin glass surface */
-OBJREC  *m;
-register RAY  *r;
+extern int
+m_glass(		/* color a ray which hit a thin glass surface */
+	OBJREC  *m,
+	register RAY  *r
+)
 {
 	COLOR  mcolor;
 	double  pdot;
@@ -69,15 +68,16 @@ register RAY  *r;
 
 	setcolor(mcolor, m->oargs.farg[0], m->oargs.farg[1], m->oargs.farg[2]);
 
+						/* get modifiers */
+	raytexture(r, m->omod);
 	if (r->rod < 0.0)			/* reorient if necessary */
 		flipsurface(r);
 	mirtest = transtest = 0;
 	mirdist = transdist = r->rot;
-						/* get modifiers */
-	raytexture(r, m->omod);
-	if (hastexture = DOT(r->pert,r->pert) > FTINY*FTINY)
+						/* perturb normal */
+	if ( (hastexture = (DOT(r->pert,r->pert) > FTINY*FTINY)) ) {
 		pdot = raynormal(pnorm, r);
-	else {
+	} else {
 		VCOPY(pnorm, r->ron);
 		pdot = r->rod;
 	}
@@ -99,8 +99,9 @@ register RAY  *r;
 		colval(trans,i) = .5*(1.0-r1e)*(1.0-r1e)*d/(1.0-r1e*r1e*d*d);
 		colval(trans,i) += .5*(1.0-r1m)*(1.0-r1m)*d/(1.0-r1m*r1m*d*d);
 	}
+	multcolor(trans, r->pcol);		/* modify by pattern */
 						/* transmitted ray */
-	if (rayorigin(&p, r, TRANS, bright(trans)) == 0) {
+	if (rayorigin(&p, TRANS, r, trans) == 0) {
 		if (!(r->crtype & SHADOW) && hastexture) {
 			for (i = 0; i < 3; i++)		/* perturb direction */
 				p.rdir[i] = r->rdir[i] +
@@ -114,8 +115,7 @@ register RAY  *r;
 			transtest = 2;
 		}
 		rayvalue(&p);
-		multcolor(p.rcol, r->pcol);	/* modify */
-		multcolor(p.rcol, trans);
+		multcolor(p.rcol, p.rcoef);
 		addcolor(r->rcol, p.rcol);
 		transtest *= bright(p.rcol);
 		transdist = r->rot + p.rt;
@@ -133,11 +133,11 @@ register RAY  *r;
 		colval(refl,i) += .5*r1m*(1.0+(1.0-2.0*r1m)*d)/(1.0-r1m*r1m*d);
 	}
 						/* reflected ray */
-	if (rayorigin(&p, r, REFLECTED, bright(refl)) == 0) {
+	if (rayorigin(&p, REFLECTED, r, refl) == 0) {
 		for (i = 0; i < 3; i++)
 			p.rdir[i] = r->rdir[i] + 2.0*pdot*pnorm[i];
 		rayvalue(&p);
-		multcolor(p.rcol, refl);
+		multcolor(p.rcol, p.rcoef);
 		addcolor(r->rcol, p.rcol);
 		if (!hastexture && r->ro != NULL && isflat(r->ro->otype)) {
 			mirtest = 2.0*bright(p.rcol);