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Comparing ray/src/rt/source.c (file contents):
Revision 2.5 by greg, Fri Aug 28 15:10:50 1992 UTC vs.
Revision 2.27 by gregl, Fri Aug 15 10:24:24 1997 UTC

#	Line 1 | Line 1
1	<	/* Copyright (c) 1992 Regents of the University of California */
1	>	/* Copyright (c) 1995 Regents of the University of California */
2
3		#ifndef lint
4		static char SCCSid[] = "$SunId$ LBL";
#	Line 18 | Line 18 | static char SCCSid[] = "$SunId$ LBL";
18
19		#include  "source.h"
20
21	+	#include  "random.h"
22	+
23	+	extern double  ssampdist;               /* scatter sampling distance */
24	+
25	+	#ifndef MAXSSAMP
26	+	#define MAXSSAMP        16              /* maximum samples per ray */
27	+	#endif
28	+
29		/*
30		* Structures used by direct()
31		*/
#	Line 68 | Line 76 | marksources()                  /* find and mark source objects */
76		o->otype != OBJ_SOURCE &&
77		m->oargs.farg[3] <= FTINY)
78		continue;                       /* don't bother */
79	+	if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY &&
80	+	m->oargs.farg[2] <= FTINY)
81	+	continue;                       /* don't bother */
82
83		if (sfun[o->otype].of == NULL ||
84		sfun[o->otype].of->setsrc == NULL)
#	Line 81 | Line 92 | marksources()                  /* find and mark source objects */
92		if (m->otype == MAT_GLOW) {
93		source[ns].sflags |= SPROX;
94		source[ns].sl.prox = m->oargs.farg[3];
95	<	if (o->otype == OBJ_SOURCE)
95	>	if (source[ns].sflags & SDISTANT)
96		source[ns].sflags |= SSKIP;
97		} else if (m->otype == MAT_SPOT) {
98		source[ns].sflags |= SSPOT;
#	Line 128 | Line 139 | SRCINDEX  *si;                 /* source sample index */
139		sr->rsrc = si->sn;                      /* remember source */
140		srcp = source + si->sn;
141		if (srcp->sflags & SDISTANT) {
142	<	if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1))
142	>	if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s))
143		continue;
144		return(1);              /* sample OK */
145		}
#	Line 138 | Line 149 | SRCINDEX  *si;                 /* source sample index */
149		continue;
150		/* check angle */
151		if (srcp->sflags & SSPOT) {
152	<	if (spotout(sr, srcp->sl.s, 0))
152	>	if (spotout(sr, srcp->sl.s))
153		continue;
154		/* adjust solid angle */
155		si->dom *= d*d;
#	Line 152 | Line 163 | SRCINDEX  *si;                 /* source sample index */
163
164
165		srcvalue(r)                     /* punch ray to source and compute value */
166	<	RAY  *r;
166	>	register RAY  *r;
167		{
168		register SRCREC  *sp;
169
#	Line 161 | Line 172 | RAY  *r;
172		/* check intersection */
173		if (!(*ofun[sp->so->otype].funp)(sp->so, r))
174		return;
175	<	raycont(r);             /* compute contribution */
175	>	if (!rayshade(r, r->ro->omod))  /* compute contribution */
176	>	goto nomat;
177	>	rayparticipate(r);
178		return;
179		}
180		/* compute intersection */
#	Line 169 | Line 182 | RAY  *r;
182		(*ofun[sp->so->otype].funp)(sp->so, r)) {
183		if (sp->sa.success >= 0)
184		sp->sa.success++;
185	<	raycont(r);             /* compute contribution */
185	>	if (!rayshade(r, r->ro->omod))  /* compute contribution */
186	>	goto nomat;
187	>	rayparticipate(r);
188		return;
189		}
190	+	/* we missed our mark! */
191		if (sp->sa.success < 0)
192		return;                 /* bitched already */
193		sp->sa.success -= AIMREQT;
#	Line 180 | Line 196 | RAY  *r;
196		sprintf(errmsg, "aiming failure for light source \"%s\"",
197		sp->so->oname);
198		error(WARNING, errmsg);         /* issue warning */
199	+	return;
200	+	nomat:
201	+	objerror(r->ro, USER, "material not found");
202		}
203
204
#	Line 208 | Line 227 | register RAY  *r;
227		}
228
229		if (r->ro != NULL) {
230	+	r->robj = objndx(r->ro);
231		for (i = 0; i < 3; i++)
232		r->ron[i] = -r->rdir[i];
233		r->rod = 1.0;
#	Line 236 | Line 256 | int  (*f)();                   /* direct component coefficient functio
256		char  *p;                       /* data for f */
257		{
258		extern int  (*trace)();
239	–	extern double  pow();
259		register int  sn;
260	+	register CONTRIB  *scp;
261		SRCINDEX  si;
262		int  nshadcheck, ncnts;
263		int  nhits;
#	Line 259 | Line 279 | char  *p;                      /* data for f */
279		error(SYSTEM, "out of memory in direct");
280		}
281		cntord[sn].sndx = sn;
282	<	srccnt[sn].sno = sr.rsrc;
282	>	scp = srccnt + sn;
283	>	scp->sno = sr.rsrc;
284		/* compute coefficient */
285	<	(*f)(srccnt[sn].coef, p, sr.rdir, si.dom);
286	<	cntord[sn].brt = bright(srccnt[sn].coef);
285	>	(*f)(scp->coef, p, sr.rdir, si.dom);
286	>	cntord[sn].brt = bright(scp->coef);
287		if (cntord[sn].brt <= 0.0)
288		continue;
289	<	VCOPY(srccnt[sn].dir, sr.rdir);
289	>	VCOPY(scp->dir, sr.rdir);
290		/* compute potential */
291		sr.revf = srcvalue;
292		rayvalue(&sr);
293	<	copycolor(srccnt[sn].val, sr.rcol);
294	<	multcolor(srccnt[sn].val, srccnt[sn].coef);
295	<	cntord[sn].brt = bright(srccnt[sn].val);
293	>	copycolor(scp->val, sr.rcol);
294	>	multcolor(scp->val, scp->coef);
295	>	cntord[sn].brt = bright(scp->val);
296		}
297		/* sort contributions */
298		qsort(cntord, sn, sizeof(CNTPTR), cntcmp);
#	Line 298 | Line 319 | char  *p;                      /* data for f */
319		/* modify threshold */
320		ourthresh = shadthresh / r->rweight;
321		/* test for shadows */
322	<	nhits = 0;
323	<	for (sn = 0; sn < ncnts; sn++) {
322	>	for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts;
323	>	hwt += (double)source[scp->sno].nhits /
324	>	(double)source[scp->sno].ntests,
325	>	sn++) {
326		/* check threshold */
327		if ((sn+nshadcheck>=ncnts ? cntord[sn].brt :
328		cntord[sn].brt-cntord[sn+nshadcheck].brt)
329		< ourthresh*bright(r->rcol))
330		break;
331	+	scp = srccnt + cntord[sn].sndx;
332		/* test for hit */
333		rayorigin(&sr, r, SHADOW, 1.0);
334	<	VCOPY(sr.rdir, srccnt[cntord[sn].sndx].dir);
335	<	sr.rsrc = srccnt[cntord[sn].sndx].sno;
336	<	source[sr.rsrc].ntests++;       /* keep statistics */
334	>	VCOPY(sr.rdir, scp->dir);
335	>	sr.rsrc = scp->sno;
336	>	source[scp->sno].ntests++;      /* keep statistics */
337		if (localhit(&sr, &thescene) &&
338	<	( sr.ro != source[sr.rsrc].so ||
339	<	source[sr.rsrc].sflags & SFOLLOW )) {
338	>	( sr.ro != source[scp->sno].so ||
339	>	source[scp->sno].sflags & SFOLLOW )) {
340		/* follow entire path */
341		raycont(&sr);
342	+	rayparticipate(&sr);
343		if (trace != NULL)
344		(*trace)(&sr);  /* trace execution */
345		if (bright(sr.rcol) <= FTINY)
346		continue;       /* missed! */
347	<	copycolor(srccnt[cntord[sn].sndx].val, sr.rcol);
348	<	multcolor(srccnt[cntord[sn].sndx].val,
324	<	srccnt[cntord[sn].sndx].coef);
347	>	copycolor(scp->val, sr.rcol);
348	>	multcolor(scp->val, scp->coef);
349		}
350		/* add contribution if hit */
351	<	addcolor(r->rcol, srccnt[cntord[sn].sndx].val);
351	>	addcolor(r->rcol, scp->val);
352		nhits++;
353	<	source[sr.rsrc].nhits++;
353	>	source[scp->sno].nhits++;
354		}
355	<	/* surface hit rate */
356	<	if (sn > 0)
357	<	hwt = (double)nhits / (double)sn;
355	>	/* source hit rate */
356	>	if (hwt > FTINY)
357	>	hwt = (double)nhits / hwt;
358		else
359		hwt = 0.5;
360		#ifdef DEBUG
361	<	sprintf(errmsg, "%d tested, %d untested, %f hit rate\n",
361	>	sprintf(errmsg, "%d tested, %d untested, %f conditional hit rate\n",
362		sn, ncnts-sn, hwt);
363		eputs(errmsg);
364		#endif
365		/* add in untested sources */
366		for ( ; sn < ncnts; sn++) {
367	<	sr.rsrc = srccnt[cntord[sn].sndx].sno;
368	<	prob = hwt * (double)source[sr.rsrc].nhits /
369	<	(double)source[sr.rsrc].ntests;
370	<	scalecolor(srccnt[cntord[sn].sndx].val, prob);
371	<	addcolor(r->rcol, srccnt[cntord[sn].sndx].val);
367	>	scp = srccnt + cntord[sn].sndx;
368	>	prob = hwt * (double)source[scp->sno].nhits /
369	>	(double)source[scp->sno].ntests;
370	>	if (prob > 1.0)
371	>	prob = 1.0;
372	>	scalecolor(scp->val, prob);
373	>	addcolor(r->rcol, scp->val);
374		}
375		}
376
377
378	+	srcscatter(r)                   /* compute source scattering into ray */
379	+	register RAY  *r;
380	+	{
381	+	int  oldsampndx;
382	+	int  nsamps;
383	+	RAY  sr;
384	+	SRCINDEX  si;
385	+	double  t, d;
386	+	double  re, ge, be;
387	+	COLOR  cvext;
388	+	int  i, j;
389	+
390	+	if (r->slights == NULL || r->slights[0] == 0
391	+	|| r->gecc >= 1.-FTINY || r->rot >= FHUGE)
392	+	return;
393	+	if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1)
394	+	nsamps = 1;
395	+	#if MAXSSAMP
396	+	else if (nsamps > MAXSSAMP)
397	+	nsamps = MAXSSAMP;
398	+	#endif
399	+	oldsampndx = samplendx;
400	+	samplendx = random()&0x7fff;            /* randomize */
401	+	for (i = r->slights[0]; i > 0; i--) {   /* for each source */
402	+	for (j = 0; j < nsamps; j++) {  /* for each sample position */
403	+	samplendx++;
404	+	t = r->rot * (j+frandom())/nsamps;
405	+	/* extinction */
406	+	re = t*colval(r->cext,RED);
407	+	ge = t*colval(r->cext,GRN);
408	+	be = t*colval(r->cext,BLU);
409	+	setcolor(cvext, re > 92. ? 0. : exp(-re),
410	+	ge > 92. ? 0. : exp(-ge),
411	+	be > 92. ? 0. : exp(-be));
412	+	if (intens(cvext) <= FTINY)
413	+	break;                  /* too far away */
414	+	sr.rorg[0] = r->rorg[0] + r->rdir[0]*t;
415	+	sr.rorg[1] = r->rorg[1] + r->rdir[1]*t;
416	+	sr.rorg[2] = r->rorg[2] + r->rdir[2]*t;
417	+	sr.rmax = 0.;
418	+	initsrcindex(&si);      /* sample ray to this source */
419	+	si.sn = r->slights[i];
420	+	nopart(&si, &sr);
421	+	if (!srcray(&sr, NULL, &si) ||
422	+	sr.rsrc != r->slights[i])
423	+	continue;               /* no path */
424	+	copycolor(sr.cext, r->cext);
425	+	copycolor(sr.albedo, r->albedo);
426	+	sr.gecc = r->gecc;
427	+	sr.slights = r->slights;
428	+	rayvalue(&sr);                  /* eval. source ray */
429	+	if (bright(sr.rcol) <= FTINY)
430	+	continue;
431	+	if (r->gecc <= FTINY)           /* compute P(theta) */
432	+	d = 1.;
433	+	else {
434	+	d = DOT(r->rdir, sr.rdir);
435	+	d = 1. + r->gecc*r->gecc - 2.*r->gecc*d;
436	+	d = (1. - r->gecc*r->gecc) / (d*sqrt(d));
437	+	}
438	+	/* other factors */
439	+	d *= si.dom * r->rot / (4.*PI*nsamps);
440	+	multcolor(sr.rcol, r->cext);
441	+	multcolor(sr.rcol, r->albedo);
442	+	scalecolor(sr.rcol, d);
443	+	multcolor(sr.rcol, cvext);
444	+	addcolor(r->rcol, sr.rcol);     /* add it in */
445	+	}
446	+	}
447	+	samplendx = oldsampndx;
448	+	}
449	+
450	+
451		/****************************************************************
452		* The following macros were separated from the m_light() routine
453		* because they are very nasty and difficult to understand.
454		*/
455
456	<	/* wrongillum *
456	>	/* illumblock *
457		*
458		* We cannot allow an illum to pass to another illum, because that
459		* would almost certainly constitute overcounting.
460		* However, we do allow an illum to pass to another illum
461		* that is actually going to relay to a virtual light source.
462	+	* We also prevent an illum from passing to a glow; this provides a
463	+	* convenient mechanism for defining detailed light source
464	+	* geometry behind (or inside) an effective radiator.
465		*/
466
467	<	#define  wrongillum(m, r)       (!(source[r->rsrc].sflags&SVIRTUAL) && \
468	<	objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM)
467	>	static int weaksrcmod(obj) int obj;     /* efficiency booster function */
468	>	{register OBJREC *o = objptr(obj);
469	>	return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);}
470
471	+	#define  illumblock(m, r)       (!(source[r->rsrc].sflags&SVIRTUAL) && \
472	+	r->rod > 0.0 && \
473	+	weaksrcmod(source[r->rsrc].so->omod))
474	+
475		/* wrongsource *
476		*
477		* This source is the wrong source (ie. overcounted) if we are
478		* aimed to a different source than the one we hit and the one
479	<	* we hit is not an illum which should be passed.
479	>	* we hit is not an illum that should be passed.
480		*/
481
482		#define  wrongsource(m, r)      (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \
483	<	(m->otype!=MAT_ILLUM || wrongillum(m,r)))
483	>	(m->otype!=MAT_ILLUM || illumblock(m,r)))
484
485		/* distglow *
486		*
487		* A distant glow is an object that sometimes acts as a light source,
488		* but is too far away from the test point to be one in this case.
489	+	* (Glows with negative radii should NEVER participate in illumination.)
490		*/
491
492	<	#define  distglow(m, r)         (m->otype==MAT_GLOW && \
493	<	r->rot > m->oargs.farg[3])
492	>	#define  distglow(m, r, d)      (m->otype==MAT_GLOW && \
493	>	m->oargs.farg[3] >= -FTINY && \
494	>	d > m->oargs.farg[3])
495
496		/* badcomponent *
497		*
#	Line 395 | Line 504 | char  *p;                      /* data for f */
504
505		#define  badcomponent(m, r)     (r->crtype&(AMBIENT|SPECULAR) && \
506		!(r->crtype&SHADOW || r->rod < 0.0 || \
507	<	distglow(m, r)))
507	>	/* not 100% correct */  distglow(m, r, r->rot)))
508
400	–	/* overcount *
401	–	*
402	–	* All overcounting possibilities are contained here.
403	–	*/
404	–
405	–	#define  overcount(m, r)        (badcomponent(m,r) || wrongsource(m,r))
406	–
509		/* passillum *
510		*
511		* An illum passes to another material type when we didn't hit it
#	Line 417 | Line 519 | char  *p;                      /* data for f */
519
520		/* srcignore *
521		*
522	<	* The -di flag renders light sources invisible, and here is the test.
522	>	* The -dv flag is normally on for sources to be visible.
523		*/
524
525	<	#define  srcignore(m, r)        (directinvis && !(r->crtype&SHADOW) && \
526	<	!distglow(m, r))
525	>	#define  srcignore(m, r)        !(directvis || r->crtype&SHADOW || \
526	>	distglow(m, r, raydist(r,PRIMARY)))
527
528
529		m_light(m, r)                   /* ray hit a light source */
#	Line 429 | Line 531 | register OBJREC  *m;
531		register RAY  *r;
532		{
533		/* check for over-counting */
534	<	if (overcount(m, r))
535	<	return;
534	>	if (badcomponent(m, r))
535	>	return(1);
536	>	if (wrongsource(m, r))
537	>	return(1);
538		/* check for passed illum */
539		if (passillum(m, r)) {
540	<	if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID))
541	<	raytrans(r);
542	<	else
543	<	rayshade(r, modifier(m->oargs.sarg[0]));
440	<	return;
540	>	if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID))
541	>	return(rayshade(r, modifier(m->oargs.sarg[0])));
542	>	raytrans(r);
543	>	return(1);
544		}
545		/* otherwise treat as source */
546		/* check for behind */
547		if (r->rod < 0.0)
548	<	return;
548	>	return(1);
549		/* check for invisibility */
550		if (srcignore(m, r))
551	<	return;
551	>	return(1);
552		/* check for outside spot */
553	<	if (m->otype==MAT_SPOT && spotout(r, (SPOT *)m->os, r->rot>=FHUGE))
554	<	return;
553	>	if (m->otype==MAT_SPOT && spotout(r, makespot(m)))
554	>	return(1);
555		/* get distribution pattern */
556		raytexture(r, m->omod);
557		/* get source color */
#	Line 457 | Line 560 | register RAY  *r;
560		m->oargs.farg[2]);
561		/* modify value */
562		multcolor(r->rcol, r->pcol);
563	+	return(1);
564		}

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