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Comparing ray/src/rt/srcsupp.c (file contents):
Revision 2.2 by greg, Sat Jan 4 19:54:20 1992 UTC vs.
Revision 2.9 by greg, Sat Feb 22 02:07:29 2003 UTC

#	Line 1 | Line 1
1	–	/* Copyright (c) 1992 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	+	/* ====================================================================
11	+	* The Radiance Software License, Version 1.0
12	+	*
13	+	* Copyright (c) 1990 - 2002 The Regents of the University of California,
14	+	* through Lawrence Berkeley National Laboratory.   All rights reserved.
15	+	*
16	+	* Redistribution and use in source and binary forms, with or without
17	+	* modification, are permitted provided that the following conditions
18	+	* are met:
19	+	*
20	+	* 1. Redistributions of source code must retain the above copyright
21	+	*         notice, this list of conditions and the following disclaimer.
22	+	*
23	+	* 2. Redistributions in binary form must reproduce the above copyright
24	+	*       notice, this list of conditions and the following disclaimer in
25	+	*       the documentation and/or other materials provided with the
26	+	*       distribution.
27	+	*
28	+	* 3. The end-user documentation included with the redistribution,
29	+	*           if any, must include the following acknowledgment:
30	+	*             "This product includes Radiance software
31	+	*                 (http://radsite.lbl.gov/)
32	+	*                 developed by the Lawrence Berkeley National Laboratory
33	+	*               (http://www.lbl.gov/)."
34	+	*       Alternately, this acknowledgment may appear in the software itself,
35	+	*       if and wherever such third-party acknowledgments normally appear.
36	+	*
37	+	* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
38	+	*       and "The Regents of the University of California" must
39	+	*       not be used to endorse or promote products derived from this
40	+	*       software without prior written permission. For written
41	+	*       permission, please contact [email protected].
42	+	*
43	+	* 5. Products derived from this software may not be called "Radiance",
44	+	*       nor may "Radiance" appear in their name, without prior written
45	+	*       permission of Lawrence Berkeley National Laboratory.
46	+	*
47	+	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
48	+	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
49	+	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
50	+	* DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
51	+	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
52	+	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
53	+	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
54	+	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
55	+	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
56	+	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
57	+	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58	+	* SUCH DAMAGE.
59	+	* ====================================================================
60	+	*
61	+	* This software consists of voluntary contributions made by many
62	+	* individuals on behalf of Lawrence Berkeley National Laboratory.   For more
63	+	* information on Lawrence Berkeley National Laboratory, please see
64	+	* <http://www.lbl.gov/>.
65	+	*/
66	+
67		#include  "ray.h"
68
69		#include  "otypes.h"
#	Line 26 | Line 82 | int  nsources = 0;                     /* the number of sources */
82		SRCFUNC  sfun[NUMOTYPE];                /* source dispatch table */
83
84
85	+	void
86		initstypes()                    /* initialize source dispatch table */
87		{
88		extern VSMATERIAL  mirror_vs, direct1_vs, direct2_vs;
32	–	extern int  fsetsrc(), ssetsrc(), sphsetsrc(), cylsetsrc(), rsetsrc();
33	–	extern int  nopart(), flatpart(), cylpart();
34	–	extern double  fgetplaneq(), rgetplaneq();
35	–	extern double  fgetmaxdisk(), rgetmaxdisk();
89		static SOBJECT  fsobj = {fsetsrc, flatpart, fgetplaneq, fgetmaxdisk};
90		static SOBJECT  ssobj = {ssetsrc, nopart};
91		static SOBJECT  sphsobj = {sphsetsrc, nopart};
#	Line 67 | Line 120 | newsource()                    /* allocate new source in our array */
120		}
121
122
123	+	void
124		setflatss(src)                          /* set sampling for a flat source */
125		register SRCREC  *src;
126		{
#	Line 86 | Line 140 | register SRCREC  *src;
140		}
141
142
143	+	void
144		fsetsrc(src, so)                        /* set a face as a source */
145		register SRCREC  *src;
146		OBJREC  *so;
#	Line 119 | Line 174 | OBJREC  *so;
174		}
175		src->srad = sqrt(src->srad);
176		/* compute size vectors */
177	<	if (f->nv == 4 || (f->nv == 5 &&        /* parallelogram case */
123	<	dist2(VERTEX(f,0),VERTEX(f,4)) <= FTINY*FTINY))
177	>	if (f->nv == 4)                         /* parallelogram case */
178		for (j = 0; j < 3; j++) {
179		src->ss[SU][j] = .5*(VERTEX(f,1)[j]-VERTEX(f,0)[j]);
180		src->ss[SV][j] = .5*(VERTEX(f,3)[j]-VERTEX(f,0)[j]);
#	Line 130 | Line 184 | OBJREC  *so;
184		}
185
186
187	+	void
188		ssetsrc(src, so)                        /* set a source as a source */
189		register SRCREC  *src;
190		register OBJREC  *so;
#	Line 156 | Line 211 | register OBJREC  *so;
211		}
212
213
214	+	void
215		sphsetsrc(src, so)                      /* set a sphere as a source */
216		register SRCREC  *src;
217		register OBJREC  *so;
#	Line 178 | Line 234 | register OBJREC  *so;
234		}
235
236
237	+	void
238		rsetsrc(src, so)                        /* set a ring (disk) as a source */
239		register SRCREC  *src;
240		OBJREC  *so;
#	Line 199 | Line 256 | OBJREC  *so;
256		}
257
258
259	+	void
260		cylsetsrc(src, so)                      /* set a cylinder as a source */
261		register SRCREC  *src;
262		OBJREC  *so;
#	Line 239 | Line 297 | register OBJREC  *m;
297		{
298		register SPOT  *ns;
299
300	+	if ((ns = (SPOT *)m->os) != NULL)
301	+	return(ns);
302		if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL)
303		return(NULL);
304		ns->siz = 2.0*PI * (1.0 - cos(PI/180.0/2.0 * m->oargs.farg[3]));
305		VCOPY(ns->aim, m->oargs.farg+4);
306		if ((ns->flen = normalize(ns->aim)) == 0.0)
307		objerror(m, USER, "zero focus vector");
308	+	m->os = (char *)ns;
309		return(ns);
310		}
311
312
313	+	int
314	+	spotout(r, s)                   /* check if we're outside spot region */
315	+	register RAY  *r;
316	+	register SPOT  *s;
317	+	{
318	+	double  d;
319	+	FVECT  vd;
320	+
321	+	if (s == NULL)
322	+	return(0);
323	+	if (s->flen < -FTINY) {         /* distant source */
324	+	vd[0] = s->aim[0] - r->rorg[0];
325	+	vd[1] = s->aim[1] - r->rorg[1];
326	+	vd[2] = s->aim[2] - r->rorg[2];
327	+	d = DOT(r->rdir,vd);
328	+	/*                      wrong side?
329	+	if (d <= FTINY)
330	+	return(1);      */
331	+	d = DOT(vd,vd) - d*d;
332	+	if (PI*d > s->siz)
333	+	return(1);      /* out */
334	+	return(0);      /* OK */
335	+	}
336	+	/* local source */
337	+	if (s->siz < 2.0*PI * (1.0 + DOT(s->aim,r->rdir)))
338	+	return(1);      /* out */
339	+	return(0);      /* OK */
340	+	}
341	+
342	+
343		double
344		fgetmaxdisk(ocent, op)          /* get center and squared radius of face */
345		FVECT  ocent;
#	Line 320 | Line 411 | OBJREC  *op;
411		}
412
413
414	+	int
415		commonspot(sp1, sp2, org)       /* set sp1 to intersection of sp1 and sp2 */
416		register SPOT  *sp1, *sp2;
417		FVECT  org;
#	Line 343 | Line 435 | FVECT  org;
435		}
436
437
438	+	int
439		commonbeam(sp1, sp2, dir)       /* set sp1 to intersection of sp1 and sp2 */
440		register SPOT  *sp1, *sp2;
441		FVECT  dir;
#	Line 367 | Line 460 | FVECT  dir;
460		}
461
462
463	+	int
464		checkspot(sp, nrm)              /* check spotlight for behind source */
465		register SPOT  *sp;     /* spotlight */
466		FVECT  nrm;             /* source surface normal */
#	Line 462 | Line 556 | double  r1s, r2s;              /* radii squared */
556		for (i = 0; i < 3; i++)
557		cc[i] = c1[i] + l*disp[i];
558		return(a2);
465	–	}
466	–
467	–
468	–	sourcehit(r)                    /* check to see if ray hit distant source */
469	–	register RAY  *r;
470	–	{
471	–	int  first, last;
472	–	register int  i;
473	–
474	–	if (r->rsrc >= 0) {             /* check only one if aimed */
475	–	first = last = r->rsrc;
476	–	} else {                        /* otherwise check all */
477	–	first = 0; last = nsources-1;
478	–	}
479	–	for (i = first; i <= last; i++)
480	–	if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT)
481	–	/*
482	–	* Check to see if ray is within
483	–	* solid angle of source.
484	–	*/
485	–	if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir))
486	–	<= source[i].ss2) {
487	–	r->ro = source[i].so;
488	–	if (!(source[i].sflags & SSKIP))
489	–	break;
490	–	}
491	–
492	–	if (r->ro != NULL) {
493	–	for (i = 0; i < 3; i++)
494	–	r->ron[i] = -r->rdir[i];
495	–	r->rod = 1.0;
496	–	r->rox = NULL;
497	–	return(1);
498	–	}
499	–	return(0);
500	–	}
501	–
502	–
503	–	/****************************************************************
504	–	* The following macros were separated from the m_light() routine
505	–	* because they are very nasty and difficult to understand.
506	–	*/
507	–
508	–	/* wrongillum *
509	–	*
510	–	* We cannot allow an illum to pass to another illum, because that
511	–	* would almost certainly constitute overcounting.
512	–	* However, we do allow an illum to pass to another illum
513	–	* that is actually going to relay to a virtual light source.
514	–	*/
515	–
516	–	#define  wrongillum(m, r)       (!(source[r->rsrc].sflags&SVIRTUAL) && \
517	–	objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM)
518	–
519	–	/* wrongsource *
520	–	*
521	–	* This source is the wrong source (ie. overcounted) if we are
522	–	* aimed to a different source than the one we hit and the one
523	–	* we hit is not an illum which should be passed.
524	–	*/
525	–
526	–	#define  wrongsource(m, r)      (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \
527	–	(m->otype!=MAT_ILLUM || wrongillum(m,r)))
528	–
529	–	/* badspecular *
530	–	*
531	–	* Any undirected specular ray that hits a light source
532	–	* should be discarded.  This is because the source contribution to
533	–	* specular components is calculated separately to reduce variance.
534	–	*/
535	–
536	–	#define  badspecular(m, r)      (r->rsrc<0 && r->crtype&SPECULAR)
537	–
538	–	/* distglow *
539	–	*
540	–	* A distant glow is an object that sometimes acts as a light source,
541	–	* but is too far away from the test point to be one in this case.
542	–	*/
543	–
544	–	#define  distglow(m, r)         (m->otype==MAT_GLOW && \
545	–	r->rot > m->oargs.farg[3])
546	–
547	–	/* badambient *
548	–	*
549	–	* We must avoid including counting light sources in the ambient calculation,
550	–	* since the direct component is handled separately.  Therefore, any
551	–	* ambient ray which hits an active light source must be discarded.
552	–	*/
553	–
554	–	#define  badambient(m, r)       ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \
555	–	!distglow(m, r))
556	–
557	–	/* overcount *
558	–	*
559	–	* All overcounting possibilities are contained here.
560	–	*/
561	–
562	–	#define  overcount(m, r)        (badspecular(m,r) || wrongsource(m,r) || \
563	–	badambient(m,r))
564	–
565	–	/* passillum *
566	–	*
567	–	* An illum passes to another material type when we didn't hit it
568	–	* on purpose (as part of a direct calculation), or it is relaying
569	–	* a virtual light source.
570	–	*/
571	–
572	–	#define  passillum(m, r)        (m->otype==MAT_ILLUM && \
573	–	(r->rsrc<0 || source[r->rsrc].so!=r->ro || \
574	–	source[r->rsrc].sflags&SVIRTUAL))
575	–
576	–	/* srcignore *
577	–	*
578	–	* The -di flag renders light sources invisible, and here is the test.
579	–	*/
580	–
581	–	#define  srcignore(m, r)        (directinvis && !(r->crtype&SHADOW) && \
582	–	!distglow(m, r))
583	–
584	–
585	–	m_light(m, r)                   /* ray hit a light source */
586	–	register OBJREC  *m;
587	–	register RAY  *r;
588	–	{
589	–	/* check for over-counting */
590	–	if (overcount(m, r))
591	–	return;
592	–	/* check for passed illum */
593	–	if (passillum(m, r)) {
594	–	if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID))
595	–	raytrans(r);
596	–	else
597	–	rayshade(r, modifier(m->oargs.sarg[0]));
598	–	return;
599	–	}
600	–	/* otherwise treat as source */
601	–	/* check for behind */
602	–	if (r->rod < 0.0)
603	–	return;
604	–	/* check for invisibility */
605	–	if (srcignore(m, r))
606	–	return;
607	–	/* get distribution pattern */
608	–	raytexture(r, m->omod);
609	–	/* get source color */
610	–	setcolor(r->rcol, m->oargs.farg[0],
611	–	m->oargs.farg[1],
612	–	m->oargs.farg[2]);
613	–	/* modify value */
614	–	multcolor(r->rcol, r->pcol);
559		}

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