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Comparing ray/src/rt/srcsupp.c (file contents):
Revision 1.7 by greg, Tue Jun 25 15:34:17 1991 UTC vs.
Revision 2.24 by greg, Thu Aug 4 22:43:46 2022 UTC

#	Line 1 | Line 1
1	–	/* Copyright (c) 1991 Regents of the University of California */
2	–
1		#ifndef lint
2	<	static char SCCSid[] = "$SunId$ LBL";
2	>	static const char       RCSid[] = "$Id$";
3		#endif
6	–
4		/*
5		*  Support routines for source objects and materials
6	+	*
7	+	*  External symbols declared in source.h
8		*/
9
10	+	#include "copyright.h"
11	+
12		#include  "ray.h"
13
14		#include  "otypes.h"
#	Line 18 | Line 19 | static char SCCSid[] = "$SunId$ LBL";
19
20		#include  "face.h"
21
22	+	#define SRCINC          32              /* realloc increment for array */
23
24		SRCREC  *source = NULL;                 /* our list of sources */
25		int  nsources = 0;                      /* the number of sources */
#	Line 25 | Line 27 | int  nsources = 0;                     /* the number of sources */
27		SRCFUNC  sfun[NUMOTYPE];                /* source dispatch table */
28
29
30	<	initstypes()                    /* initialize source dispatch table */
30	>	void
31	>	initstypes(void)                        /* initialize source dispatch table */
32		{
33	<	extern VSMATERIAL  mirror_vs;
34	<	extern int  fsetsrc(), ssetsrc(), sphsetsrc(), rsetsrc();
35	<	extern double  fgetplaneq(), rgetplaneq();
36	<	extern double  fgetmaxdisk(), rgetmaxdisk();
37	<	static SOBJECT  fsobj = {fsetsrc, fgetplaneq, fgetmaxdisk};
38	<	static SOBJECT  ssobj = {ssetsrc};
36	<	static SOBJECT  sphsobj = {sphsetsrc};
37	<	static SOBJECT  rsobj = {rsetsrc, rgetplaneq, rgetmaxdisk};
33	>	extern VSMATERIAL  mirror_vs, direct1_vs, direct2_vs;
34	>	static SOBJECT  fsobj = {fsetsrc, flatpart, fgetplaneq, fgetmaxdisk};
35	>	static SOBJECT  ssobj = {ssetsrc, nopart};
36	>	static SOBJECT  sphsobj = {sphsetsrc, nopart};
37	>	static SOBJECT  cylsobj = {cylsetsrc, cylpart};
38	>	static SOBJECT  rsobj = {rsetsrc, flatpart, rgetplaneq, rgetmaxdisk};
39
40		sfun[MAT_MIRROR].mf = &mirror_vs;
41	+	sfun[MAT_DIRECT1].mf = &direct1_vs;
42	+	sfun[MAT_DIRECT2].mf = &direct2_vs;
43		sfun[OBJ_FACE].of = &fsobj;
44		sfun[OBJ_SOURCE].of = &ssobj;
45		sfun[OBJ_SPHERE].of = &sphsobj;
46	+	sfun[OBJ_CYLINDER].of = &cylsobj;
47		sfun[OBJ_RING].of = &rsobj;
48		}
49
50
51		int
52	<	newsource()                     /* allocate new source in our array */
52	>	newsource(void)                 /* allocate new source in our array */
53		{
54		if (nsources == 0)
55	<	source = (SRCREC *)malloc(sizeof(SRCREC));
56	<	else
57	<	source = (SRCREC *)realloc((char *)source,
58	<	(unsigned)(nsources+1)*sizeof(SRCREC));
55	>	source = (SRCREC *)malloc(SRCINC*sizeof(SRCREC));
56	>	else if (nsources%SRCINC == 0)
57	>	source = (SRCREC *)realloc((void *)source,
58	>	(unsigned)(nsources+SRCINC)*sizeof(SRCREC));
59		if (source == NULL)
60		return(-1);
61		source[nsources].sflags = 0;
62		source[nsources].nhits = 1;
63	<	source[nsources].ntests = 2;    /* initial hit probability = 1/2 */
63	>	source[nsources].ntests = 2;    /* initial hit probability = 50% */
64	>	#if SHADCACHE
65	>	source[nsources].obscache = NULL;
66	>	#endif
67		return(nsources++);
68		}
69
70
71	<	fsetsrc(src, so)                        /* set a face as a source */
72	<	register SRCREC  *src;
73	<	OBJREC  *so;
71	>	void
72	>	setflatss(                              /* set sampling for a flat source */
73	>	SRCREC  *src
74	>	)
75		{
76	<	register FACE  *f;
77	<	register int  i, j;
76	>	double  mult;
77	>	int  i;
78	>
79	>	getperpendicular(src->ss[SU], src->snorm, rand_samp);
80	>	mult = .5 * sqrt( src->ss2 );
81	>	for (i = 0; i < 3; i++)
82	>	src->ss[SU][i] *= mult;
83	>	fcross(src->ss[SV], src->snorm, src->ss[SU]);
84	>	}
85	>
86	>
87	>	void
88	>	fsetsrc(                        /* set a face as a source */
89	>	SRCREC  *src,
90	>	OBJREC  *so
91	>	)
92	>	{
93	>	FACE  *f;
94	>	int  i, j;
95	>	double  d;
96
97		src->sa.success = 2*AIMREQT-1;          /* bitch on second failure */
98		src->so = so;
99		/* get the face */
100		f = getface(so);
101	+	if (f->area == 0.)
102	+	objerror(so, USER, "zero source area");
103		/* find the center */
104		for (j = 0; j < 3; j++) {
105		src->sloc[j] = 0.0;
#	Line 80 | Line 108 | OBJREC  *so;
108		src->sloc[j] /= (double)f->nv;
109		}
110		if (!inface(src->sloc, f))
111	<	objerror(so, USER, "cannot hit center");
111	>	objerror(so, USER, "cannot hit source center");
112		src->sflags |= SFLAT;
113		VCOPY(src->snorm, f->norm);
86	–	src->ss = sqrt(f->area / PI);
114		src->ss2 = f->area;
115	+	/* find maximum radius */
116	+	src->srad = 0.;
117	+	for (i = 0; i < f->nv; i++) {
118	+	d = dist2(VERTEX(f,i), src->sloc);
119	+	if (d > src->srad)
120	+	src->srad = d;
121	+	}
122	+	src->srad = sqrt(src->srad);
123	+	/* compute size vectors */
124	+	if (f->nv == 4) {                               /* parallelogram case */
125	+	for (j = 0; j < 3; j++) {
126	+	src->ss[SU][j] = .5*(VERTEX(f,1)[j]-VERTEX(f,0)[j]);
127	+	src->ss[SV][j] = .5*(VERTEX(f,3)[j]-VERTEX(f,0)[j]);
128	+	}
129	+	} else if (f->nv == 3) {                        /* triangle case */
130	+	int     near0 = 2;
131	+	double  dmin = dist2line(src->sloc, VERTEX(f,2), VERTEX(f,0));
132	+	for (i = 0; i < 2; i++) {
133	+	double  d2 = dist2line(src->sloc, VERTEX(f,i), VERTEX(f,i+1));
134	+	if (d2 >= dmin)
135	+	continue;
136	+	near0 = i;
137	+	dmin = d2;                      /* radius = min distance */
138	+	}
139	+	if (dmin < .08*f->area)
140	+	objerror(so, WARNING, "triangular source with poor aspect");
141	+	i = (near0 + 1) % 3;
142	+	for (j = 0; j < 3; j++)
143	+	src->ss[SU][j] = VERTEX(f,i)[j] - VERTEX(f,near0)[j];
144	+	normalize(src->ss[SU]);
145	+	dmin = sqrt(dmin);
146	+	for (j = 0; j < 3; j++)
147	+	src->ss[SU][j] *= dmin;
148	+	fcross(src->ss[SV], f->norm, src->ss[SU]);
149	+	} else
150	+	setflatss(src);                         /* hope for convex! */
151		}
152
153
154	<	ssetsrc(src, so)                        /* set a source as a source */
155	<	register SRCREC  *src;
156	<	register OBJREC  *so;
154	>	void
155	>	ssetsrc(                        /* set a source as a source */
156	>	SRCREC  *src,
157	>	OBJREC  *so
158	>	)
159		{
160		double  theta;
161
#	Line 98 | Line 163 | register OBJREC  *so;
163		src->so = so;
164		if (so->oargs.nfargs != 4)
165		objerror(so, USER, "bad arguments");
166	<	src->sflags |= SDISTANT;
166	>	src->sflags |= (SDISTANT|SCIR);
167		VCOPY(src->sloc, so->oargs.farg);
168		if (normalize(src->sloc) == 0.0)
169		objerror(so, USER, "zero direction");
170		theta = PI/180.0/2.0 * so->oargs.farg[3];
171		if (theta <= FTINY)
172		objerror(so, USER, "zero size");
108	–	src->ss = theta >= PI/4.0 ? 1.0 : tan(theta);
173		src->ss2 = 2.0*PI * (1.0 - cos(theta));
174	+	/* the following is approximate */
175	+	src->srad = sqrt(src->ss2/PI);
176	+	VCOPY(src->snorm, src->sloc);
177	+	setflatss(src);                 /* hey, whatever works */
178		}
179
180
181	<	sphsetsrc(src, so)                      /* set a sphere as a source */
182	<	register SRCREC  *src;
183	<	register OBJREC  *so;
181	>	void
182	>	sphsetsrc(                      /* set a sphere as a source */
183	>	SRCREC  *src,
184	>	OBJREC  *so
185	>	)
186		{
187	+	int  i;
188	+
189		src->sa.success = 2*AIMREQT-1;          /* bitch on second failure */
190		src->so = so;
191		if (so->oargs.nfargs != 4)
192		objerror(so, USER, "bad # arguments");
193		if (so->oargs.farg[3] <= FTINY)
194	<	objerror(so, USER, "illegal radius");
194	>	objerror(so, USER, "illegal source radius");
195	>	src->sflags |= SCIR;
196		VCOPY(src->sloc, so->oargs.farg);
197	<	src->ss = so->oargs.farg[3];
198	<	src->ss2 = PI * src->ss * src->ss;
197	>	src->srad = so->oargs.farg[3];
198	>	src->ss2 = PI * src->srad * src->srad;
199	>	memset(src->ss, 0, sizeof(src->ss));
200	>	for (i = 0; i < 3; i++)
201	>	src->ss[i][i] = 0.7236 * so->oargs.farg[3];
202		}
203
204
205	<	rsetsrc(src, so)                        /* set a ring (disk) as a source */
206	<	register SRCREC  *src;
207	<	OBJREC  *so;
205	>	void
206	>	rsetsrc(                        /* set a ring (disk) as a source */
207	>	SRCREC  *src,
208	>	OBJREC  *so
209	>	)
210		{
211	<	register CONE  *co;
211	>	CONE  *co;
212
213		src->sa.success = 2*AIMREQT-1;          /* bitch on second failure */
214		src->so = so;
215		/* get the ring */
216		co = getcone(so, 0);
217	+	if (co == NULL)
218	+	objerror(so, USER, "illegal source");
219	+	if (CO_R1(co) <= FTINY)
220	+	objerror(so, USER, "illegal source radius");
221		VCOPY(src->sloc, CO_P0(co));
222		if (CO_R0(co) > 0.0)
223	<	objerror(so, USER, "cannot hit center");
224	<	src->sflags |= SFLAT;
223	>	objerror(so, USER, "cannot hit source center");
224	>	src->sflags |= (SFLAT|SCIR);
225		VCOPY(src->snorm, co->ad);
226	<	src->ss = CO_R1(co);
227	<	src->ss2 = PI * src->ss * src->ss;
226	>	src->srad = CO_R1(co);
227	>	src->ss2 = PI * src->srad * src->srad;
228	>	setflatss(src);
229		}
230
231
232	+	void
233	+	cylsetsrc(                      /* set a cylinder as a source */
234	+	SRCREC  *src,
235	+	OBJREC  *so
236	+	)
237	+	{
238	+	CONE  *co;
239	+	int  i;
240	+
241	+	src->sa.success = 4*AIMREQT-1;          /* bitch on fourth failure */
242	+	src->so = so;
243	+	/* get the cylinder */
244	+	co = getcone(so, 0);
245	+	if (co == NULL)
246	+	objerror(so, USER, "illegal source");
247	+	if (CO_R0(co) <= FTINY)
248	+	objerror(so, USER, "illegal source radius");
249	+	if (CO_R0(co) > .2*co->al)              /* heuristic constraint */
250	+	objerror(so, WARNING, "source aspect too small");
251	+	src->sflags |= SCYL;
252	+	for (i = 0; i < 3; i++)
253	+	src->sloc[i] = .5 * (CO_P1(co)[i] + CO_P0(co)[i]);
254	+	src->srad = .5*co->al;
255	+	src->ss2 = 2.*CO_R0(co)*co->al;
256	+	/* set sampling vectors */
257	+	for (i = 0; i < 3; i++)
258	+	src->ss[SU][i] = .5 * co->al * co->ad[i];
259	+	getperpendicular(src->ss[SW], co->ad, rand_samp);
260	+	for (i = 0; i < 3; i++)
261	+	src->ss[SW][i] *= .8559 * CO_R0(co);
262	+	fcross(src->ss[SV], src->ss[SW], co->ad);
263	+	}
264	+
265	+
266		SPOT *
267	<	makespot(m)                     /* make a spotlight */
268	<	register OBJREC  *m;
267	>	makespot(                       /* make a spotlight */
268	>	OBJREC  *m
269	>	)
270		{
271	<	register SPOT  *ns;
271	>	SPOT  *ns;
272
273	+	if ((ns = (SPOT *)m->os) != NULL)
274	+	return(ns);
275		if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL)
276		return(NULL);
277	+	if (m->oargs.farg[3] <= FTINY)
278	+	objerror(m, USER, "zero angle");
279		ns->siz = 2.0*PI * (1.0 - cos(PI/180.0/2.0 * m->oargs.farg[3]));
280		VCOPY(ns->aim, m->oargs.farg+4);
281		if ((ns->flen = normalize(ns->aim)) == 0.0)
282		objerror(m, USER, "zero focus vector");
283	+	m->os = (char *)ns;
284		return(ns);
285		}
286
287
288	+	int
289	+	spotout(                        /* check if we're outside spot region */
290	+	RAY  *r,
291	+	SPOT  *s
292	+	)
293	+	{
294	+	double  d;
295	+	FVECT  vd;
296	+
297	+	if (s == NULL)
298	+	return(0);
299	+	if (s->flen < -FTINY) {         /* distant source */
300	+	vd[0] = s->aim[0] - r->rorg[0];
301	+	vd[1] = s->aim[1] - r->rorg[1];
302	+	vd[2] = s->aim[2] - r->rorg[2];
303	+	d = DOT(r->rdir,vd);
304	+	/*                      wrong side?
305	+	if (d <= FTINY)
306	+	return(1);      */
307	+	d = DOT(vd,vd) - d*d;
308	+	if (PI*d > s->siz)
309	+	return(1);      /* out */
310	+	return(0);      /* OK */
311	+	}
312	+	/* local source */
313	+	if (s->siz < 2.0*PI * (1.0 + DOT(s->aim,r->rdir)))
314	+	return(1);      /* out */
315	+	return(0);      /* OK */
316	+	}
317	+
318	+
319		double
320	<	fgetmaxdisk(ocent, op)          /* get center and squared radius of face */
321	<	FVECT  ocent;
322	<	OBJREC  *op;
320	>	fgetmaxdisk(            /* get center and squared radius of face */
321	>	FVECT  ocent,
322	>	OBJREC  *op
323	>	)
324		{
325		double  maxrad2;
326		double  d;
327	<	register int  i, j;
328	<	register FACE  *f;
327	>	int  i, j;
328	>	FACE  *f;
329
330		f = getface(op);
331		if (f->area == 0.)
#	Line 195 | Line 350 | OBJREC  *op;
350
351
352		double
353	<	rgetmaxdisk(ocent, op)          /* get center and squared radius of ring */
354	<	FVECT  ocent;
355	<	OBJREC  *op;
353	>	rgetmaxdisk(            /* get center and squared radius of ring */
354	>	FVECT  ocent,
355	>	OBJREC  *op
356	>	)
357		{
358	<	register CONE  *co;
358	>	CONE  *co;
359
360		co = getcone(op, 0);
361	+	if (co == NULL)
362	+	return(0.);
363		VCOPY(ocent, CO_P0(co));
364		return(CO_R1(co)*CO_R1(co));
365		}
366
367
368		double
369	<	fgetplaneq(nvec, op)                    /* get plane equation for face */
370	<	FVECT  nvec;
371	<	OBJREC  *op;
369	>	fgetplaneq(                     /* get plane equation for face */
370	>	FVECT  nvec,
371	>	OBJREC  *op
372	>	)
373		{
374	<	register FACE  *fo;
374	>	FACE  *fo;
375
376		fo = getface(op);
377		VCOPY(nvec, fo->norm);
#	Line 221 | Line 380 | OBJREC  *op;
380
381
382		double
383	<	rgetplaneq(nvec, op)                    /* get plane equation for ring */
384	<	FVECT  nvec;
385	<	OBJREC  *op;
383	>	rgetplaneq(                     /* get plane equation for ring */
384	>	FVECT  nvec,
385	>	OBJREC  *op
386	>	)
387		{
388	<	register CONE  *co;
388	>	CONE  *co;
389
390		co = getcone(op, 0);
391	+	if (co == NULL) {
392	+	memset(nvec, 0, sizeof(FVECT));
393	+	return(0.);
394	+	}
395		VCOPY(nvec, co->ad);
396		return(DOT(nvec, CO_P0(co)));
397		}
398
399
400	<	commonspot(sp1, sp2, org)       /* set sp1 to intersection of sp1 and sp2 */
401	<	register SPOT  *sp1, *sp2;
402	<	FVECT  org;
400	>	int
401	>	commonspot(             /* set sp1 to intersection of sp1 and sp2 */
402	>	SPOT  *sp1,
403	>	SPOT  *sp2,
404	>	FVECT  org
405	>	)
406		{
407		FVECT  cent;
408		double  rad2, cos1, cos2;
#	Line 256 | Line 423 | FVECT  org;
423		}
424
425
426	<	commonbeam(sp1, sp2, dir)       /* set sp1 to intersection of sp1 and sp2 */
427	<	register SPOT  *sp1, *sp2;
428	<	FVECT  dir;
426	>	int
427	>	commonbeam(             /* set sp1 to intersection of sp1 and sp2 */
428	>	SPOT  *sp1,
429	>	SPOT  *sp2,
430	>	FVECT  dir
431	>	)
432		{
433		FVECT  cent, c1, c2;
434		double  rad2, d;
265	–	register int  i;
435		/* move centers to common plane */
436		d = DOT(sp1->aim, dir);
437	<	for (i = 0; i < 3; i++)
269	<	c1[i] = sp1->aim[i] - d*dir[i];
437	>	VSUM(c1, sp1->aim, dir, -d);
438		d = DOT(sp2->aim, dir);
439	<	for (i = 0; i < 3; i++)
272	<	c2[i] = sp2->aim[i] - d*dir[i];
439	>	VSUM(c2, sp2->aim, dir, -d);
440		/* compute overlap */
441		rad2 = intercircle(cent, c1, c2, sp1->siz/PI, sp2->siz/PI);
442		if (rad2 <= FTINY)
#	Line 280 | Line 447 | FVECT  dir;
447		}
448
449
450	<	checkspot(sp, nrm)              /* check spotlight for behind source */
451	<	register SPOT  *sp;     /* spotlight */
452	<	FVECT  nrm;             /* source surface normal */
450	>	int
451	>	checkspot(                      /* check spotlight for behind source */
452	>	SPOT  *sp,      /* spotlight */
453	>	FVECT  nrm      /* source surface normal */
454	>	)
455		{
456		double  d, d1;
457
458		d = DOT(sp->aim, nrm);
459		if (d > FTINY)                  /* center in front? */
460	<	return(0);
460	>	return(1);
461		/* else check horizon */
462		d1 = 1. - sp->siz/(2.*PI);
463	<	return(1.-FTINY-d*d > d1*d1);
463	>	return(1.-FTINY-d*d < d1*d1);
464		}
465
466
467		double
468	<	spotdisk(oc, op, sp, pos)       /* intersect spot with object op */
469	<	FVECT  oc;
470	<	OBJREC  *op;
471	<	register SPOT  *sp;
472	<	FVECT  pos;
468	>	spotdisk(               /* intersect spot with object op */
469	>	FVECT  oc,
470	>	OBJREC  *op,
471	>	SPOT  *sp,
472	>	FVECT  pos
473	>	)
474		{
475		FVECT  onorm;
476		double  offs, d, dist;
307	–	register int  i;
477
478		offs = getplaneq(onorm, op);
479		d = -DOT(onorm, sp->aim);
#	Line 313 | Line 482 | FVECT  pos;
482		dist = (DOT(pos, onorm) - offs)/d;
483		if (dist < 0.)
484		return(0.);
485	<	for (i = 0; i < 3; i++)
317	<	oc[i] = pos[i] + dist*sp->aim[i];
485	>	VSUM(oc, pos, sp->aim, dist);
486		return(sp->siz*dist*dist/PI/(d*d));
487		}
488
489
490		double
491	<	beamdisk(oc, op, sp, dir)       /* intersect beam with object op */
492	<	FVECT  oc;
493	<	OBJREC  *op;
494	<	register SPOT  *sp;
495	<	FVECT  dir;
491	>	beamdisk(               /* intersect beam with object op */
492	>	FVECT  oc,
493	>	OBJREC  *op,
494	>	SPOT  *sp,
495	>	FVECT  dir
496	>	)
497		{
498		FVECT  onorm;
499		double  offs, d, dist;
331	–	register int  i;
500
501		offs = getplaneq(onorm, op);
502		d = -DOT(onorm, dir);
503		if (d >= -FTINY && d <= FTINY)
504		return(0.);
505		dist = (DOT(sp->aim, onorm) - offs)/d;
506	<	for (i = 0; i < 3; i++)
339	<	oc[i] = sp->aim[i] + dist*dir[i];
506	>	VSUM(oc, sp->aim, dir, dist);
507		return(sp->siz/PI/(d*d));
508		}
509
510
511		double
512	<	intercircle(cc, c1, c2, r1s, r2s)       /* intersect two circles */
513	<	FVECT  cc;                      /* midpoint (return value) */
514	<	FVECT  c1, c2;                  /* circle centers */
515	<	double  r1s, r2s;               /* radii squared */
512	>	intercircle(                            /* intersect two circles */
513	>	FVECT  cc,              /* midpoint (return value) */
514	>	FVECT  c1,              /* circle centers */
515	>	FVECT  c2,
516	>	double  r1s,            /* radii squared */
517	>	double  r2s
518	>	)
519		{
520		double  a2, d2, l;
521		FVECT  disp;
352	–	register int  i;
522
523	<	for (i = 0; i < 3; i++)
355	<	disp[i] = c2[i] - c1[i];
523	>	VSUB(disp, c2, c1);
524		d2 = DOT(disp,disp);
525		/* circle within overlap? */
526		if (r1s < r2s) {
#	Line 372 | Line 540 | double  r1s, r2s;              /* radii squared */
540		return(0.);
541		/* overlap, compute center */
542		l = sqrt((r1s - a2)/d2);
543	<	for (i = 0; i < 3; i++)
376	<	cc[i] = c1[i] + l*disp[i];
543	>	VSUM(cc, c1, disp, l);
544		return(a2);
378	–	}
379	–
380	–
381	–	sourcehit(r)                    /* check to see if ray hit distant source */
382	–	register RAY  *r;
383	–	{
384	–	int  first, last;
385	–	register int  i;
386	–
387	–	if (r->rsrc >= 0) {             /* check only one if aimed */
388	–	first = last = r->rsrc;
389	–	} else {                        /* otherwise check all */
390	–	first = 0; last = nsources-1;
391	–	}
392	–	for (i = first; i <= last; i++)
393	–	if (source[i].sflags & SDISTANT)
394	–	/*
395	–	* Check to see if ray is within
396	–	* solid angle of source.
397	–	*/
398	–	if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir))
399	–	<= source[i].ss2) {
400	–	r->ro = source[i].so;
401	–	if (!(source[i].sflags & SSKIP))
402	–	break;
403	–	}
404	–
405	–	if (r->ro != NULL) {
406	–	for (i = 0; i < 3; i++)
407	–	r->ron[i] = -r->rdir[i];
408	–	r->rod = 1.0;
409	–	r->rox = NULL;
410	–	return(1);
411	–	}
412	–	return(0);
413	–	}
414	–
415	–
416	–	#define  wrongsource(m, r)      (m->otype!=MAT_ILLUM && \
417	–	r->rsrc>=0 && \
418	–	source[r->rsrc].so!=r->ro)
419	–
420	–	#define  badambient(m, r)       ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \
421	–	!(m->otype==MAT_GLOW&&r->rot>m->oargs.farg[3]))
422	–
423	–	#define  passillum(m, r)        (m->otype==MAT_ILLUM && \
424	–	!(r->rsrc>=0&&source[r->rsrc].so==r->ro))
425	–
426	–
427	–	m_light(m, r)                   /* ray hit a light source */
428	–	register OBJREC  *m;
429	–	register RAY  *r;
430	–	{
431	–	/* check for over-counting */
432	–	if (wrongsource(m, r) || badambient(m, r))
433	–	return;
434	–	/* check for passed illum */
435	–	if (passillum(m, r)) {
436	–
437	–	if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID))
438	–	raytrans(r);
439	–	else
440	–	rayshade(r, modifier(m->oargs.sarg[0]));
441	–
442	–	/* otherwise treat as source */
443	–	} else {
444	–	/* check for behind */
445	–	if (r->rod < 0.0)
446	–	return;
447	–	/* get distribution pattern */
448	–	raytexture(r, m->omod);
449	–	/* get source color */
450	–	setcolor(r->rcol, m->oargs.farg[0],
451	–	m->oargs.farg[1],
452	–	m->oargs.farg[2]);
453	–	/* modify value */
454	–	multcolor(r->rcol, r->pcol);
455	–	}
545		}

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