ViewVC Help

View File | Revision Log | Show Annotations | Download File | Root Listing

root/Development/ray/src/rt/srcsupp.c

Comparing ray/src/rt/srcsupp.c (file contents):
Revision 2.2 by greg, Sat Jan 4 19:54:20 1992 UTC vs.
Revision 2.15 by greg, Sun Oct 16 16:04:10 2005 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	+	#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          4               /* realloc increment for array */
22	>	#define SRCINC          8               /* realloc increment for array */
23
24		SRCREC  *source = NULL;                 /* our list of sources */
25		int  nsources = 0;                      /* the number of sources */
#	Line 26 | Line 27 | int  nsources = 0;                     /* the number of sources */
27		SRCFUNC  sfun[NUMOTYPE];                /* source dispatch table */
28
29
30	+	void
31		initstypes()                    /* initialize source dispatch table */
32		{
33		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();
34		static SOBJECT  fsobj = {fsetsrc, flatpart, fgetplaneq, fgetmaxdisk};
35		static SOBJECT  ssobj = {ssetsrc, nopart};
36		static SOBJECT  sphsobj = {sphsetsrc, nopart};
#	Line 56 | Line 54 | newsource()                    /* allocate new source in our array */
54		if (nsources == 0)
55		source = (SRCREC *)malloc(SRCINC*sizeof(SRCREC));
56		else if (nsources%SRCINC == 0)
57	<	source = (SRCREC *)realloc((char *)source,
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	+	void
72		setflatss(src)                          /* set sampling for a flat source */
73		register SRCREC  *src;
74		{
#	Line 86 | Line 88 | register SRCREC  *src;
88		}
89
90
91	+	void
92		fsetsrc(src, so)                        /* set a face as a source */
93		register SRCREC  *src;
94		OBJREC  *so;
#	Line 106 | Line 109 | OBJREC  *so;
109		src->sloc[j] /= (double)f->nv;
110		}
111		if (!inface(src->sloc, f))
112	<	objerror(so, USER, "cannot hit center");
112	>	objerror(so, USER, "cannot hit center for source");
113		src->sflags |= SFLAT;
114		VCOPY(src->snorm, f->norm);
115		src->ss2 = f->area;
#	Line 119 | Line 122 | OBJREC  *so;
122		}
123		src->srad = sqrt(src->srad);
124		/* compute size vectors */
125	<	if (f->nv == 4 || (f->nv == 5 &&        /* parallelogram case */
123	<	dist2(VERTEX(f,0),VERTEX(f,4)) <= FTINY*FTINY))
125	>	if (f->nv == 4)                         /* parallelogram case */
126		for (j = 0; j < 3; j++) {
127		src->ss[SU][j] = .5*(VERTEX(f,1)[j]-VERTEX(f,0)[j]);
128		src->ss[SV][j] = .5*(VERTEX(f,3)[j]-VERTEX(f,0)[j]);
#	Line 130 | Line 132 | OBJREC  *so;
132		}
133
134
135	+	void
136		ssetsrc(src, so)                        /* set a source as a source */
137		register SRCREC  *src;
138		register OBJREC  *so;
#	Line 156 | Line 159 | register OBJREC  *so;
159		}
160
161
162	+	void
163		sphsetsrc(src, so)                      /* set a sphere as a source */
164		register SRCREC  *src;
165		register OBJREC  *so;
#	Line 178 | Line 182 | register OBJREC  *so;
182		}
183
184
185	+	void
186		rsetsrc(src, so)                        /* set a ring (disk) as a source */
187		register SRCREC  *src;
188		OBJREC  *so;
#	Line 190 | Line 195 | OBJREC  *so;
195		co = getcone(so, 0);
196		VCOPY(src->sloc, CO_P0(co));
197		if (CO_R0(co) > 0.0)
198	<	objerror(so, USER, "cannot hit center");
198	>	objerror(so, USER, "cannot hit center for source");
199		src->sflags |= SFLAT;
200		VCOPY(src->snorm, co->ad);
201		src->srad = CO_R1(co);
#	Line 199 | Line 204 | OBJREC  *so;
204		}
205
206
207	+	void
208		cylsetsrc(src, so)                      /* set a cylinder as a source */
209		register SRCREC  *src;
210		OBJREC  *so;
#	Line 239 | Line 245 | register OBJREC  *m;
245		{
246		register SPOT  *ns;
247
248	+	if ((ns = (SPOT *)m->os) != NULL)
249	+	return(ns);
250		if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL)
251		return(NULL);
252		ns->siz = 2.0*PI * (1.0 - cos(PI/180.0/2.0 * m->oargs.farg[3]));
253		VCOPY(ns->aim, m->oargs.farg+4);
254		if ((ns->flen = normalize(ns->aim)) == 0.0)
255		objerror(m, USER, "zero focus vector");
256	+	m->os = (char *)ns;
257		return(ns);
258		}
259
260
261	+	int
262	+	spotout(r, s)                   /* check if we're outside spot region */
263	+	register RAY  *r;
264	+	register SPOT  *s;
265	+	{
266	+	double  d;
267	+	FVECT  vd;
268	+
269	+	if (s == NULL)
270	+	return(0);
271	+	if (s->flen < -FTINY) {         /* distant source */
272	+	vd[0] = s->aim[0] - r->rorg[0];
273	+	vd[1] = s->aim[1] - r->rorg[1];
274	+	vd[2] = s->aim[2] - r->rorg[2];
275	+	d = DOT(r->rdir,vd);
276	+	/*                      wrong side?
277	+	if (d <= FTINY)
278	+	return(1);      */
279	+	d = DOT(vd,vd) - d*d;
280	+	if (PI*d > s->siz)
281	+	return(1);      /* out */
282	+	return(0);      /* OK */
283	+	}
284	+	/* local source */
285	+	if (s->siz < 2.0*PI * (1.0 + DOT(s->aim,r->rdir)))
286	+	return(1);      /* out */
287	+	return(0);      /* OK */
288	+	}
289	+
290	+
291		double
292		fgetmaxdisk(ocent, op)          /* get center and squared radius of face */
293		FVECT  ocent;
#	Line 320 | Line 359 | OBJREC  *op;
359		}
360
361
362	+	int
363		commonspot(sp1, sp2, org)       /* set sp1 to intersection of sp1 and sp2 */
364		register SPOT  *sp1, *sp2;
365		FVECT  org;
#	Line 343 | Line 383 | FVECT  org;
383		}
384
385
386	+	int
387		commonbeam(sp1, sp2, dir)       /* set sp1 to intersection of sp1 and sp2 */
388		register SPOT  *sp1, *sp2;
389		FVECT  dir;
#	Line 367 | Line 408 | FVECT  dir;
408		}
409
410
411	+	int
412		checkspot(sp, nrm)              /* check spotlight for behind source */
413		register SPOT  *sp;     /* spotlight */
414		FVECT  nrm;             /* source surface normal */
#	Line 462 | Line 504 | double  r1s, r2s;              /* radii squared */
504		for (i = 0; i < 3; i++)
505		cc[i] = c1[i] + l*disp[i];
506		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);
507		}

Diff Legend

–	Removed lines
+	Added lines
<	Changed lines (old)
>	Changed lines (new)