[ViewVC] Diff of: radiance/ray/src/common/bsdf.c

Comparing ray/src/common/bsdf.c (file contents):
Revision 2.20 by greg, Mon Apr 11 03:47:46 2011 UTC vs.
Revision 2.55 by greg, Thu May 10 22:55:35 2018 UTC

#	Line 10 \| Line 10 \| static const char RCSid[] = "$Id$";
10		*
11		*/
12
13	+	#define _USE_MATH_DEFINES
14		#include <stdio.h>
15		#include <stdlib.h>
16	+	#include <string.h>
17		#include <math.h>
18	+	#include <ctype.h>
19		#include "ezxml.h"
20		#include "hilbert.h"
21		#include "bsdf.h"
#	Line 32 \| Line 35 \| *const char SDerrorEnglish[] = {**
35		"Unknown error"
36		};
37
38	+	/* Pointer to error list in preferred language */
39	+	const char **SDerrorList = SDerrorEnglish;
40	+
41		/* Additional information on last error (ASCII English) */
42		char SDerrorDetail[256];
43
44	+	/* Empty distribution for getCDist() calls that fail for some reason */
45	+	const SDCDst SDemptyCD;
46	+
47		/* Cache of loaded BSDFs */
48		struct SDCache_s *SDcacheList = NULL;
49
50		/* Retain BSDFs in cache list */
51		int SDretainSet = SDretainNone;
52
53	<	/* Report any error to the indicated stream (in English) */
53	>	/* Report any error to the indicated stream */
54		SDError
55	<	SDreportEnglish(SDError ec, FILE *fp)
55	>	SDreportError(SDError ec, FILE *fp)
56		{
48	–	if (fp == NULL)
49	–	return ec;
57		if (!ec)
58		return SDEnone;
59	<	fputs(SDerrorEnglish[ec], fp);
59	>	if ((ec < SDEnone) \| (ec > SDEunknown)) {
60	>	SDerrorDetail[0] = '\0';
61	>	ec = SDEunknown;
62	>	}
63	>	if (fp == NULL)
64	>	return ec;
65	>	fputs(SDerrorList[ec], fp);
66		if (SDerrorDetail[0]) {
67		fputs(": ", fp);
68		fputs(SDerrorDetail, fp);
#	Line 77 \| Line 90 \| *to_meters( / return factor to convert given unit to**
90
91		/* Load geometric dimensions and description (if any) */
92		static SDError
93	<	SDloadGeometry(SDData *sd, ezxml_t wdb)
93	>	SDloadGeometry(SDData *sd, ezxml_t wtl)
94		{
95	<	ezxml_t geom;
95	>	ezxml_t node, matl, geom;
96		double cfact;
97	<	const char fmt, mgfstr;
97	>	const char fmt = NULL, mgfstr;
98
99	<	if (wdb == NULL) /* no geometry section? */
100	<	return SDEnone;
101	<	sd->dim[0] = sd->dim[1] = sd->dim[2] = .0;
102	<	if ((geom = ezxml_child(wdb, "Width")) != NULL)
103	<	sd->dim[0] = atof(ezxml_txt(geom)) *
104	<	to_meters(ezxml_attr(geom, "unit"));
105	<	if ((geom = ezxml_child(wdb, "Height")) != NULL)
106	<	sd->dim[1] = atof(ezxml_txt(geom)) *
107	<	to_meters(ezxml_attr(geom, "unit"));
108	<	if ((geom = ezxml_child(wdb, "Thickness")) != NULL)
109	<	sd->dim[2] = atof(ezxml_txt(geom)) *
110	<	to_meters(ezxml_attr(geom, "unit"));
111	<	if ((sd->dim[0] < .0) \| (sd->dim[1] < .0) \| (sd->dim[2] < .0)) {
112	<	sprintf(SDerrorDetail, "Negative size in \"%s\"", sd->name);
113	<	return SDEdata;
99	>	SDerrorDetail[0] = '\0';
100	>	sd->matn[0] = '\0'; sd->makr[0] = '\0';
101	>	sd->dim[0] = sd->dim[1] = sd->dim[2] = 0;
102	>	matl = ezxml_child(wtl, "Material");
103	>	if (matl != NULL) { /* get material info. */
104	>	if ((node = ezxml_child(matl, "Name")) != NULL) {
105	>	strncpy(sd->matn, ezxml_txt(node), SDnameLn);
106	>	if (sd->matn[SDnameLn-1])
107	>	strcpy(sd->matn+(SDnameLn-4), "...");
108	>	}
109	>	if ((node = ezxml_child(matl, "Manufacturer")) != NULL) {
110	>	strncpy(sd->makr, ezxml_txt(node), SDnameLn);
111	>	if (sd->makr[SDnameLn-1])
112	>	strcpy(sd->makr+(SDnameLn-4), "...");
113	>	}
114	>	if ((node = ezxml_child(matl, "Width")) != NULL)
115	>	sd->dim[0] = atof(ezxml_txt(node)) *
116	>	to_meters(ezxml_attr(node, "unit"));
117	>	if ((node = ezxml_child(matl, "Height")) != NULL)
118	>	sd->dim[1] = atof(ezxml_txt(node)) *
119	>	to_meters(ezxml_attr(node, "unit"));
120	>	if ((node = ezxml_child(matl, "Thickness")) != NULL)
121	>	sd->dim[2] = atof(ezxml_txt(node)) *
122	>	to_meters(ezxml_attr(node, "unit"));
123	>	if ((sd->dim[0] < 0) \| (sd->dim[1] < 0) \| (sd->dim[2] < 0)) {
124	>	if (!SDerrorDetail[0])
125	>	sprintf(SDerrorDetail, "Negative dimension in \"%s\"",
126	>	sd->name);
127	>	return SDEdata;
128	>	}
129		}
130	<	if ((geom = ezxml_child(wdb, "Geometry")) == NULL \|\|
131	<	(mgfstr = ezxml_txt(geom)) == NULL)
130	>	sd->mgf = NULL;
131	>	geom = ezxml_child(wtl, "Geometry");
132	>	if (geom == NULL) /* no actual geometry? */
133		return SDEnone;
134	<	if ((fmt = ezxml_attr(geom, "format")) != NULL &&
135	<	strcasecmp(fmt, "MGF")) {
134	>	fmt = ezxml_attr(geom, "format");
135	>	if (fmt != NULL && strcasecmp(fmt, "MGF")) {
136		sprintf(SDerrorDetail,
137		"Unrecognized geometry format '%s' in \"%s\"",
138		fmt, sd->name);
139		return SDEsupport;
140		}
141	<	cfact = to_meters(ezxml_attr(geom, "unit"));
141	>	if ((node = ezxml_child(geom, "MGFblock")) == NULL \|\|
142	>	(mgfstr = ezxml_txt(node)) == NULL)
143	>	return SDEnone;
144	>	while (isspace(*mgfstr))
145	>	++mgfstr;
146	>	if (!*mgfstr)
147	>	return SDEnone;
148	>	cfact = to_meters(ezxml_attr(node, "unit"));
149	>	if (cfact <= 0)
150	>	return SDEformat;
151		sd->mgf = (char *)malloc(strlen(mgfstr)+32);
152		if (sd->mgf == NULL) {
153		strcpy(SDerrorDetail, "Out of memory in SDloadGeometry");
#	Line 151 \| Line 189 \| *SDloadFile(SDData sd, const char fname)*
189		ezxml_free(fl);
190		return SDEformat;
191		}
192	+	wtl = ezxml_child(fl, "FileType");
193	+	if (wtl != NULL && strcmp(ezxml_txt(wtl), "BSDF")) {
194	+	sprintf(SDerrorDetail,
195	+	"XML \"%s\": wrong FileType (must be 'BSDF')",
196	+	sd->name);
197	+	ezxml_free(fl);
198	+	return SDEformat;
199	+	}
200		wtl = ezxml_child(ezxml_child(fl, "Optical"), "Layer");
201		if (wtl == NULL) {
202	<	sprintf(SDerrorDetail, "BSDF \"%s\": no optical layer'",
202	>	sprintf(SDerrorDetail, "BSDF \"%s\": no optical layers",
203		sd->name);
204		ezxml_free(fl);
205		return SDEformat;
206		}
207		/* load geometry if present */
208	<	lastErr = SDloadGeometry(sd, ezxml_child(wtl, "Material"));
209	<	if (lastErr)
208	>	lastErr = SDloadGeometry(sd, wtl);
209	>	if (lastErr) {
210	>	ezxml_free(fl);
211		return lastErr;
212	+	}
213		/* try loading variable resolution data */
214		lastErr = SDloadTre(sd, wtl);
215		/* check our result */
216	<	switch (lastErr) {
169	<	case SDEformat:
170	<	case SDEdata:
171	<	case SDEsupport: /* possibly we just tried the wrong format */
216	>	if (lastErr == SDEsupport) /* try matrix BSDF if not tree data */
217		lastErr = SDloadMtx(sd, wtl);
218	<	break;
174	<	default: /* variable res. OK else serious error */
175	<	break;
176	<	}
218	>
219		/* done with XML file */
220		ezxml_free(fl);
221
#	Line 191 \| Line 233 \| *SDloadFile(SDData sd, const char fname)*
233		if (sd->tf != NULL && sd->tf->maxHemi <= .001) {
234		SDfreeSpectralDF(sd->tf); sd->tf = NULL;
235		}
236	+	if (sd->tb != NULL && sd->tb->maxHemi <= .001) {
237	+	SDfreeSpectralDF(sd->tb); sd->tb = NULL;
238	+	}
239		/* return success */
240		return SDEnone;
241		}
#	Line 219 \| Line 264 \| SDnewSpectralDF(int nc)
264		return df;
265		}
266
267	+	/* Add component(s) to spectral distribution function */
268	+	SDSpectralDF *
269	+	SDaddComponent(SDSpectralDF *odf, int nadd)
270	+	{
271	+	SDSpectralDF *df;
272	+
273	+	if (odf == NULL)
274	+	return SDnewSpectralDF(nadd);
275	+	if (nadd <= 0)
276	+	return odf;
277	+	df = (SDSpectralDF *)realloc(odf, sizeof(SDSpectralDF) +
278	+	(odf->ncomp+nadd-1)*sizeof(SDComponent));
279	+	if (df == NULL) {
280	+	sprintf(SDerrorDetail,
281	+	"Cannot add %d component(s) to spectral DF", nadd);
282	+	SDfreeSpectralDF(odf);
283	+	return NULL;
284	+	}
285	+	memset(df->comp+df->ncomp, 0, nadd*sizeof(SDComponent));
286	+	df->ncomp += nadd;
287	+	return df;
288	+	}
289	+
290		/* Free cached cumulative distributions for BSDF component */
291		void
292		SDfreeCumulativeCache(SDSpectralDF *df)
#	Line 245 \| Line 313 \| *SDfreeSpectralDF(SDSpectralDF df)**
313		return;
314		SDfreeCumulativeCache(df);
315		for (n = df->ncomp; n-- > 0; )
316	<	(*df->comp[n].func->freeSC)(df->comp[n].dist);
316	>	if (df->comp[n].dist != NULL)
317	>	(*df->comp[n].func->freeSC)(df->comp[n].dist);
318		free(df);
319		}
320
#	Line 301 \| Line 370 \| *SDfreeBSDF(SDData sd)**
370		SDfreeSpectralDF(sd->tf);
371		sd->tf = NULL;
372		}
373	+	if (sd->tb != NULL) {
374	+	SDfreeSpectralDF(sd->tb);
375	+	sd->tb = NULL;
376	+	}
377		sd->rLambFront.cieY = .0;
378		sd->rLambFront.spec.flags = 0;
379		sd->rLambBack.cieY = .0;
#	Line 334 \| Line 407 \| *SDgetCache(const char bname)**
407		sdl->next = SDcacheList;
408		SDcacheList = sdl;
409
410	<	sdl->refcnt++;
410	>	sdl->refcnt = 1;
411		return &sdl->bsdf;
412		}
413
#	Line 349 \| Line 422 \| *SDcacheFile(const char fname)**
422		if (fname == NULL \|\| !*fname)
423		return NULL;
424		SDerrorDetail[0] = '\0';
425	+	/* PLACE MUTEX LOCK HERE FOR THREAD-SAFE */
426		if ((sd = SDgetCache(fname)) == NULL) {
427	<	SDreportEnglish(SDEmemory, stderr);
427	>	SDreportError(SDEmemory, stderr);
428		return NULL;
429		}
430		if (!SDisLoaded(sd) && (ec = SDloadFile(sd, fname))) {
431	<	SDreportEnglish(ec, stderr);
431	>	SDreportError(ec, stderr);
432		SDfreeCache(sd);
433	<	return NULL;
433	>	sd = NULL;
434		}
435	+	/* END MUTEX LOCK */
436		return sd;
437		}
438
#	Line 378 \| Line 453 \| *SDfreeCache(const SDData sd)**
453		for (sdl = SDcacheList; sdl != NULL; sdl = (sdLast=sdl)->next)
454		if (&sdl->bsdf == sd)
455		break;
456	<	if (sdl == NULL \|\| --sdl->refcnt)
456	>	if (sdl == NULL \|\| (sdl->refcnt -= (sdl->refcnt > 0)))
457		return; /* missing or still in use */
458		/* keep unreferenced data? */
459		if (SDisLoaded(sd) && SDretainSet) {
#	Line 388 \| Line 463 \| *SDfreeCache(const SDData sd)**
463		SDfreeCumulativeCache(sd->rf);
464		SDfreeCumulativeCache(sd->rb);
465		SDfreeCumulativeCache(sd->tf);
466	+	SDfreeCumulativeCache(sd->tb);
467		return;
468		}
469		/* remove from list and free */
#	Line 401 \| Line 477 \| *SDfreeCache(const SDData sd)**
477
478		/* Sample an individual BSDF component */
479		SDError
480	<	SDsampComponent(SDValue *sv, FVECT outVec, const FVECT inVec,
405	<	double randX, SDComponent *sdc)
480	>	SDsampComponent(SDValue sv, FVECT ioVec, double randX, SDComponent sdc)
481		{
482		float coef[SDmaxCh];
483		SDError ec;
484	+	FVECT inVec;
485		const SDCDst *cd;
486		double d;
487		int n;
488		/* check arguments */
489	<	if ((sv == NULL) \| (outVec == NULL) \| (inVec == NULL) \| (sdc == NULL))
489	>	if ((sv == NULL) \| (ioVec == NULL) \| (sdc == NULL))
490		return SDEargument;
491		/* get cumulative distribution */
492	+	VCOPY(inVec, ioVec);
493	+	sv->cieY = 0;
494		cd = (*sdc->func->getCDist)(inVec, sdc);
495	<	if (cd == NULL)
496	<	return SDEmemory;
497	<	if (cd->cTotal <= 1e-7) { /* anything to sample? */
495	>	if (cd != NULL)
496	>	sv->cieY = cd->cTotal;
497	>	if (sv->cieY <= 1e-6) { /* nothing to sample? */
498		sv->spec = c_dfcolor;
499	<	sv->cieY = .0;
422	<	memset(outVec, 0, 3*sizeof(double));
499	>	memset(ioVec, 0, sizeof(FVECT));
500		return SDEnone;
501		}
425	–	sv->cieY = cd->cTotal;
502		/* compute sample direction */
503	<	ec = (*sdc->func->sampCDist)(outVec, randX, cd);
503	>	ec = (*sdc->func->sampCDist)(ioVec, randX, cd);
504		if (ec)
505		return ec;
506		/* get BSDF color */
507	<	n = (*sdc->func->getBSDFs)(coef, outVec, inVec, sdc->dist);
507	>	n = (*sdc->func->getBSDFs)(coef, ioVec, inVec, sdc);
508		if (n <= 0) {
509		strcpy(SDerrorDetail, "BSDF sample value error");
510		return SDEinternal;
#	Line 439 \| Line 515 \| *SDsampComponent(SDValue sv, FVECT outVec, const FVECT**
515		c_cmix(&sv->spec, d, &sv->spec, coef[n], &sdc->cspec[n]);
516		d += coef[n];
517		}
518	<	/* make sure everything is set */
443	<	c_ccvt(&sv->spec, C_CSXY+C_CSSPEC);
518	>	c_ccvt(&sv->spec, C_CSXY); /* make sure (x,y) is set */
519		return SDEnone;
520		}
521
#	Line 453 \| Line 528 \| SDmultiSamp(double t[], int n, double randX)
528		unsigned nBits;
529		double scale;
530		bitmask_t ndx, coord[MS_MAXDIM];
531	<
531	>
532	>	if (n <= 0) /* check corner cases */
533	>	return;
534	>	if (randX < 0) randX = 0;
535	>	else if (randX >= 1.) randX = 0.999999999999999;
536	>	if (n == 1) {
537	>	t[0] = randX;
538	>	return;
539	>	}
540		while (n > MS_MAXDIM) /* punt for higher dimensions */
541		t[--n] = rand()*(1./(RAND_MAX+.5));
542		nBits = (8*sizeof(bitmask_t) - 1) / n;
#	Line 476 \| Line 559 \| SDdiffuseSamp(FVECT outVec, int outFront, double randX
559		SDmultiSamp(outVec, 2, randX);
560		SDsquare2disk(outVec, outVec[0], outVec[1]);
561		outVec[2] = 1. - outVec[0]outVec[0] - outVec[1]outVec[1];
562	<	if (outVec[2] > .0) /* a bit of paranoia */
480	<	outVec[2] = sqrt(outVec[2]);
562	>	outVec[2] = sqrt(outVec[2]*(outVec[2]>0));
563		if (!outFront) /* going out back? */
564		outVec[2] = -outVec[2];
565		}
566
567		/* Query projected solid angle coverage for non-diffuse BSDF direction */
568		SDError
569	<	SDsizeBSDF(double projSA, const FVECT vec, int qflags, const SDData sd)
569	>	SDsizeBSDF(double projSA, const FVECT v1, const RREAL v2,
570	>	int qflags, const SDData *sd)
571		{
572	<	SDSpectralDF *rdf;
572	>	SDSpectralDF rdf, tdf;
573		SDError ec;
574		int i;
575		/* check arguments */
576	<	if ((projSA == NULL) \| (vec == NULL) \| (sd == NULL))
576	>	if ((projSA == NULL) \| (v1 == NULL) \| (sd == NULL))
577		return SDEargument;
578		/* initialize extrema */
579		switch (qflags) {
#	Line 506 \| Line 589 \| *SDsizeBSDF(double projSA, const FVECT vec, int qflags**
589		case 0:
590		return SDEargument;
591		}
592	<	if (vec[2] > .0) /* front surface query? */
592	>	if (v1[2] > 0) { /* front surface query? */
593		rdf = sd->rf;
594	<	else
594	>	tdf = (sd->tf != NULL) ? sd->tf : sd->tb;
595	>	} else {
596		rdf = sd->rb;
597	+	tdf = (sd->tb != NULL) ? sd->tb : sd->tf;
598	+	}
599	+	if (v2 != NULL) { /* bidirectional? */
600	+	if (v1[2] > 0 ^ v2[2] > 0)
601	+	rdf = NULL;
602	+	else
603	+	tdf = NULL;
604	+	}
605		ec = SDEdata; /* run through components */
606		for (i = (rdf==NULL) ? 0 : rdf->ncomp; i--; ) {
607	<	ec = (*rdf->comp[i].func->queryProjSA)(projSA, vec, qflags,
608	<	rdf->comp[i].dist);
607	>	ec = (*rdf->comp[i].func->queryProjSA)(projSA, v1, v2,
608	>	qflags, &rdf->comp[i]);
609		if (ec)
610		return ec;
611		}
612	<	for (i = (sd->tf==NULL) ? 0 : sd->tf->ncomp; i--; ) {
613	<	ec = (*sd->tf->comp[i].func->queryProjSA)(projSA, vec, qflags,
614	<	sd->tf->comp[i].dist);
612	>	for (i = (tdf==NULL) ? 0 : tdf->ncomp; i--; ) {
613	>	ec = (*tdf->comp[i].func->queryProjSA)(projSA, v1, v2,
614	>	qflags, &tdf->comp[i]);
615		if (ec)
616		return ec;
617		}
#	Line 527 \| Line 619 \| *SDsizeBSDF(double projSA, const FVECT vec, int qflags**
619		projSA[0] = M_PI;
620		if (qflags == SDqueryMin+SDqueryMax)
621		projSA[1] = M_PI;
622	<	}
622	>	} else if (qflags == SDqueryMin+SDqueryMax && projSA[0] > projSA[1])
623	>	projSA[0] = projSA[1];
624		return SDEnone;
625		}
626
#	Line 543 \| Line 636 \| *SDevalBSDF(SDValue sv, const FVECT outVec, const FVEC**
636		if ((sv == NULL) \| (outVec == NULL) \| (inVec == NULL) \| (sd == NULL))
637		return SDEargument;
638		/* whose side are we on? */
639	<	inFront = (inVec[2] > .0);
640	<	outFront = (outVec[2] > .0);
639	>	inFront = (inVec[2] > 0);
640	>	outFront = (outVec[2] > 0);
641		/* start with diffuse portion */
642		if (inFront & outFront) {
643		*sv = sd->rLambFront;
#	Line 552 \| Line 645 \| *SDevalBSDF(SDValue sv, const FVECT outVec, const FVEC**
645		} else if (!(inFront \| outFront)) {
646		*sv = sd->rLambBack;
647		sdf = sd->rb;
648	<	} else /* inFront ^ outFront */ {
648	>	} else if (outFront) {
649		*sv = sd->tLamb;
650	<	sdf = sd->tf;
650	>	sdf = (sd->tf != NULL) ? sd->tf : sd->tb;
651	>	} else /* inFront & !outFront */ {
652	>	*sv = sd->tLamb;
653	>	sdf = (sd->tb != NULL) ? sd->tb : sd->tf;
654		}
655		sv->cieY *= 1./M_PI;
656		/* add non-diffuse components */
657		i = (sdf != NULL) ? sdf->ncomp : 0;
658		while (i-- > 0) {
659		nch = (*sdf->comp[i].func->getBSDFs)(coef, outVec, inVec,
660	<	sdf->comp[i].dist);
660	>	&sdf->comp[i]);
661		while (nch-- > 0) {
662		c_cmix(&sv->spec, sv->cieY, &sv->spec,
663		coef[nch], &sdf->comp[i].cspec[nch]);
664		sv->cieY += coef[nch];
665		}
666		}
667	<	/* make sure everything is set */
572	<	c_ccvt(&sv->spec, C_CSXY+C_CSSPEC);
667	>	c_ccvt(&sv->spec, C_CSXY); /* make sure (x,y) is set */
668		return SDEnone;
669		}
670
#	Line 578 \| Line 673 \| double
673		SDdirectHemi(const FVECT inVec, int sflags, const SDData *sd)
674		{
675		double hsum;
676	<	SDSpectralDF *rdf;
676	>	SDSpectralDF rdf, tdf;
677		const SDCDst *cd;
678		int i;
679		/* check arguments */
680		if ((inVec == NULL) \| (sd == NULL))
681		return .0;
682		/* gather diffuse components */
683	<	if (inVec[2] > .0) {
683	>	if (inVec[2] > 0) {
684		hsum = sd->rLambFront.cieY;
685		rdf = sd->rf;
686	+	tdf = (sd->tf != NULL) ? sd->tf : sd->tb;
687		} else /* !inFront */ {
688		hsum = sd->rLambBack.cieY;
689		rdf = sd->rb;
690	+	tdf = (sd->tb != NULL) ? sd->tb : sd->tf;
691		}
692		if ((sflags & SDsampDf+SDsampR) != SDsampDf+SDsampR)
693		hsum = .0;
694		if ((sflags & SDsampDf+SDsampT) == SDsampDf+SDsampT)
695		hsum += sd->tLamb.cieY;
696		/* gather non-diffuse components */
697	<	i = ((sflags & SDsampSp+SDsampR) == SDsampSp+SDsampR &&
698	<	rdf != NULL) ? rdf->ncomp : 0;
697	>	i = (((sflags & SDsampSp+SDsampR) == SDsampSp+SDsampR) &
698	>	(rdf != NULL)) ? rdf->ncomp : 0;
699		while (i-- > 0) { /* non-diffuse reflection */
700		cd = (*rdf->comp[i].func->getCDist)(inVec, &rdf->comp[i]);
701		if (cd != NULL)
702		hsum += cd->cTotal;
703		}
704	<	i = ((sflags & SDsampSp+SDsampT) == SDsampSp+SDsampT &&
705	<	sd->tf != NULL) ? sd->tf->ncomp : 0;
704	>	i = (((sflags & SDsampSp+SDsampT) == SDsampSp+SDsampT) &
705	>	(tdf != NULL)) ? tdf->ncomp : 0;
706		while (i-- > 0) { /* non-diffuse transmission */
707	<	cd = (*sd->tf->comp[i].func->getCDist)(inVec, &sd->tf->comp[i]);
707	>	cd = (*tdf->comp[i].func->getCDist)(inVec, &tdf->comp[i]);
708		if (cd != NULL)
709		hsum += cd->cTotal;
710		}
#	Line 616 \| Line 713 \| SDdirectHemi(const FVECT inVec, int sflags, const SDDa
713
714		/* Sample BSDF direction based on the given random variable */
715		SDError
716	<	SDsampBSDF(SDValue *sv, FVECT outVec, const FVECT inVec,
620	<	double randX, int sflags, const SDData *sd)
716	>	SDsampBSDF(SDValue sv, FVECT ioVec, double randX, int sflags, const SDData sd)
717		{
718		SDError ec;
719	+	FVECT inVec;
720		int inFront;
721	<	SDSpectralDF *rdf;
721	>	SDSpectralDF rdf, tdf;
722		double rdiff;
723		float coef[SDmaxCh];
724		int i, j, n, nr;
725		SDComponent *sdc;
726		const SDCDst **cdarr = NULL;
727		/* check arguments */
728	<	if ((sv == NULL) \| (outVec == NULL) \| (inVec == NULL) \| (sd == NULL) \|
729	<	(randX < .0) \| (randX >= 1.))
728	>	if ((sv == NULL) \| (ioVec == NULL) \| (sd == NULL) \|
729	>	(randX < 0) \| (randX >= 1.))
730		return SDEargument;
731		/* whose side are we on? */
732	<	inFront = (inVec[2] > .0);
732	>	VCOPY(inVec, ioVec);
733	>	inFront = (inVec[2] > 0);
734		/* remember diffuse portions */
735		if (inFront) {
736		*sv = sd->rLambFront;
737		rdf = sd->rf;
738	+	tdf = (sd->tf != NULL) ? sd->tf : sd->tb;
739		} else /* !inFront */ {
740		*sv = sd->rLambBack;
741		rdf = sd->rb;
742	+	tdf = (sd->tb != NULL) ? sd->tb : sd->tf;
743		}
744		if ((sflags & SDsampDf+SDsampR) != SDsampDf+SDsampR)
745		sv->cieY = .0;
#	Line 647 \| Line 747 \| *SDsampBSDF(SDValue sv, FVECT outVec, const FVECT inVe**
747		if ((sflags & SDsampDf+SDsampT) == SDsampDf+SDsampT)
748		sv->cieY += sd->tLamb.cieY;
749		/* gather non-diffuse components */
750	<	i = nr = ((sflags & SDsampSp+SDsampR) == SDsampSp+SDsampR &&
751	<	rdf != NULL) ? rdf->ncomp : 0;
752	<	j = ((sflags & SDsampSp+SDsampT) == SDsampSp+SDsampT &&
753	<	sd->tf != NULL) ? sd->tf->ncomp : 0;
750	>	i = nr = (((sflags & SDsampSp+SDsampR) == SDsampSp+SDsampR) &
751	>	(rdf != NULL)) ? rdf->ncomp : 0;
752	>	j = (((sflags & SDsampSp+SDsampT) == SDsampSp+SDsampT) &
753	>	(tdf != NULL)) ? tdf->ncomp : 0;
754		n = i + j;
755		if (n > 0 && (cdarr = (const SDCDst *)malloc(nsizeof(SDCDst *))) == NULL)
756		return SDEmemory;
757		while (j-- > 0) { /* non-diffuse transmission */
758	<	cdarr[i+j] = (*sd->tf->comp[j].func->getCDist)(inVec, &sd->tf->comp[j]);
759	<	if (cdarr[i+j] == NULL) {
760	<	free(cdarr);
661	<	return SDEmemory;
662	<	}
758	>	cdarr[i+j] = (*tdf->comp[j].func->getCDist)(inVec, &tdf->comp[j]);
759	>	if (cdarr[i+j] == NULL)
760	>	cdarr[i+j] = &SDemptyCD;
761		sv->cieY += cdarr[i+j]->cTotal;
762		}
763		while (i-- > 0) { /* non-diffuse reflection */
764		cdarr[i] = (*rdf->comp[i].func->getCDist)(inVec, &rdf->comp[i]);
765	<	if (cdarr[i] == NULL) {
766	<	free(cdarr);
669	<	return SDEmemory;
670	<	}
765	>	if (cdarr[i] == NULL)
766	>	cdarr[i] = &SDemptyCD;
767		sv->cieY += cdarr[i]->cTotal;
768		}
769	<	if (sv->cieY <= 1e-7) { /* anything to sample? */
769	>	if (sv->cieY <= 1e-6) { /* anything to sample? */
770		sv->cieY = .0;
771	<	memset(outVec, 0, 3*sizeof(double));
771	>	memset(ioVec, 0, sizeof(FVECT));
772		return SDEnone;
773		}
774		/* scale random variable */
775		randX *= sv->cieY;
776		/* diffuse reflection? */
777		if (randX < rdiff) {
778	<	SDdiffuseSamp(outVec, inFront, randX/rdiff);
778	>	SDdiffuseSamp(ioVec, inFront, randX/rdiff);
779		goto done;
780		}
781		randX -= rdiff;
#	Line 687 \| Line 783 \| *SDsampBSDF(SDValue sv, FVECT outVec, const FVECT inVe**
783		if ((sflags & SDsampDf+SDsampT) == SDsampDf+SDsampT) {
784		if (randX < sd->tLamb.cieY) {
785		sv->spec = sd->tLamb.spec;
786	<	SDdiffuseSamp(outVec, !inFront, randX/sd->tLamb.cieY);
786	>	SDdiffuseSamp(ioVec, !inFront, randX/sd->tLamb.cieY);
787		goto done;
788		}
789		randX -= sd->tLamb.cieY;
790		}
791		/* else one of cumulative dist. */
792	<	for (i = 0; i < n && randX < cdarr[i]->cTotal; i++)
792	>	for (i = 0; i < n && randX > cdarr[i]->cTotal; i++)
793		randX -= cdarr[i]->cTotal;
794		if (i >= n)
795		return SDEinternal;
796		/* compute sample direction */
797	<	sdc = (i < nr) ? &rdf->comp[i] : &sd->tf->comp[i-nr];
798	<	ec = (*sdc->func->sampCDist)(outVec, randX/cdarr[i]->cTotal, cdarr[i]);
797	>	sdc = (i < nr) ? &rdf->comp[i] : &tdf->comp[i-nr];
798	>	ec = (*sdc->func->sampCDist)(ioVec, randX/cdarr[i]->cTotal, cdarr[i]);
799		if (ec)
800		return ec;
801		/* compute color */
802	<	j = (*sdc->func->getBSDFs)(coef, outVec, inVec, sdc->dist);
802	>	j = (*sdc->func->getBSDFs)(coef, ioVec, inVec, sdc);
803		if (j <= 0) {
804		sprintf(SDerrorDetail, "BSDF \"%s\" sampling value error",
805		sd->name);
#	Line 718 \| Line 814 \| *SDsampBSDF(SDValue sv, FVECT outVec, const FVECT inVe**
814		done:
815		if (cdarr != NULL)
816		free(cdarr);
817	<	/* make sure everything is set */
722	<	c_ccvt(&sv->spec, C_CSXY+C_CSSPEC);
817	>	c_ccvt(&sv->spec, C_CSXY); /* make sure (x,y) is set */
818		return SDEnone;
819		}
820
#	Line 730 \| Line 825 \| SDcompXform(RREAL vMtx[3][3], const FVECT sNrm, const
825		if ((vMtx == NULL) \| (sNrm == NULL) \| (uVec == NULL))
826		return SDEargument;
827		VCOPY(vMtx[2], sNrm);
828	<	if (normalize(vMtx[2]) == .0)
828	>	if (normalize(vMtx[2]) == 0)
829		return SDEargument;
830		fcross(vMtx[0], uVec, vMtx[2]);
831	<	if (normalize(vMtx[0]) == .0)
831	>	if (normalize(vMtx[0]) == 0)
832		return SDEargument;
833		fcross(vMtx[1], vMtx[2], vMtx[0]);
834		return SDEnone;
#	Line 753 \| Line 848 \| SDinvXform(RREAL iMtx[3][3], RREAL vMtx[3][3])
848		mTmp[0][1] = vMtx[2][1]vMtx[0][2] - vMtx[2][2]vMtx[0][1];
849		mTmp[0][2] = vMtx[1][2]vMtx[0][1] - vMtx[1][1]vMtx[0][2];
850		d = vMtx[0][0]mTmp[0][0] + vMtx[1][0]mTmp[0][1] + vMtx[2][0]*mTmp[0][2];
851	<	if (d == .0) {
851	>	if (d == 0) {
852		strcpy(SDerrorDetail, "Zero determinant in matrix inversion");
853		return SDEargument;
854		}
#	Line 780 \| Line 875 \| SDmapDir(FVECT resVec, RREAL vMtx[3][3], const FVECT i
875		if (vMtx == NULL) { /* assume they just want to normalize */
876		if (resVec != inpVec)
877		VCOPY(resVec, inpVec);
878	<	return (normalize(resVec) > .0) ? SDEnone : SDEargument;
878	>	return (normalize(resVec) > 0) ? SDEnone : SDEargument;
879		}
880		vTmp[0] = DOT(vMtx[0], inpVec);
881		vTmp[1] = DOT(vMtx[1], inpVec);
882		vTmp[2] = DOT(vMtx[2], inpVec);
883	<	if (normalize(vTmp) == .0)
883	>	if (normalize(vTmp) == 0)
884		return SDEargument;
885		VCOPY(resVec, vTmp);
886		return SDEnone;
887		}
793	–
794	–	/################################################################/
795	–	/######### DEPRECATED ROUTINES AWAITING PERMANENT REMOVAL #######/
796	–
797	–	/*
798	–	* Routines for handling BSDF data
799	–	*/
800	–
801	–	#include "standard.h"
802	–	#include "paths.h"
803	–	#include <ctype.h>
804	–
805	–	#define MAXLATS 46 /* maximum number of latitudes */
806	–
807	–	/* BSDF angle specification */
808	–	typedef struct {
809	–	char name[64]; /* basis name */
810	–	int nangles; /* total number of directions */
811	–	struct {
812	–	float tmin; /* starting theta */
813	–	short nphis; /* number of phis (0 term) */
814	–	} lat[MAXLATS+1]; /* latitudes */
815	–	} ANGLE_BASIS;
816	–
817	–	#define MAXABASES 7 /* limit on defined bases */
818	–
819	–	static ANGLE_BASIS abase_list[MAXABASES] = {
820	–	{
821	–	"LBNL/Klems Full", 145,
822	–	{ {-5., 1},
823	–	{5., 8},
824	–	{15., 16},
825	–	{25., 20},
826	–	{35., 24},
827	–	{45., 24},
828	–	{55., 24},
829	–	{65., 16},
830	–	{75., 12},
831	–	{90., 0} }
832	–	}, {
833	–	"LBNL/Klems Half", 73,
834	–	{ {-6.5, 1},
835	–	{6.5, 8},
836	–	{19.5, 12},
837	–	{32.5, 16},
838	–	{46.5, 20},
839	–	{61.5, 12},
840	–	{76.5, 4},
841	–	{90., 0} }
842	–	}, {
843	–	"LBNL/Klems Quarter", 41,
844	–	{ {-9., 1},
845	–	{9., 8},
846	–	{27., 12},
847	–	{46., 12},
848	–	{66., 8},
849	–	{90., 0} }
850	–	}
851	–	};
852	–
853	–	static int nabases = 3; /* current number of defined bases */
854	–
855	–	#define FEQ(a,b) ((a)-(b) <= 1e-6 && (b)-(a) <= 1e-6)
856	–
857	–	static int
858	–	fequal(double a, double b)
859	–	{
860	–	if (b != .0)
861	–	a = a/b - 1.;
862	–	return((a <= 1e-6) & (a >= -1e-6));
863	–	}
864	–
865	–	/* Returns the name of the given tag */
866	–	#ifdef ezxml_name
867	–	#undef ezxml_name
868	–	static char *
869	–	ezxml_name(ezxml_t xml)
870	–	{
871	–	if (xml == NULL)
872	–	return(NULL);
873	–	return(xml->name);
874	–	}
875	–	#endif
876	–
877	–	/* Returns the given tag's character content or empty string if none */
878	–	#ifdef ezxml_txt
879	–	#undef ezxml_txt
880	–	static char *
881	–	ezxml_txt(ezxml_t xml)
882	–	{
883	–	if (xml == NULL)
884	–	return("");
885	–	return(xml->txt);
886	–	}
887	–	#endif
888	–
889	–
890	–	static int
891	–	ab_getvec( /* get vector for this angle basis index */
892	–	FVECT v,
893	–	int ndx,
894	–	void *p
895	–	)
896	–	{
897	–	ANGLE_BASIS ab = (ANGLE_BASIS )p;
898	–	int li;
899	–	double pol, azi, d;
900	–
901	–	if ((ndx < 0) \| (ndx >= ab->nangles))
902	–	return(0);
903	–	for (li = 0; ndx >= ab->lat[li].nphis; li++)
904	–	ndx -= ab->lat[li].nphis;
905	–	pol = PI/180.0.5(ab->lat[li].tmin + ab->lat[li+1].tmin);
906	–	azi = 2.PIndx/ab->lat[li].nphis;
907	–	v[2] = d = cos(pol);
908	–	d = sqrt(1. - dd); / sin(pol) */
909	–	v[0] = cos(azi)*d;
910	–	v[1] = sin(azi)*d;
911	–	return(1);
912	–	}
913	–
914	–
915	–	static int
916	–	ab_getndx( /* get index corresponding to the given vector */
917	–	FVECT v,
918	–	void *p
919	–	)
920	–	{
921	–	ANGLE_BASIS ab = (ANGLE_BASIS )p;
922	–	int li, ndx;
923	–	double pol, azi, d;
924	–
925	–	if ((v[2] < -1.0) \| (v[2] > 1.0))
926	–	return(-1);
927	–	pol = 180.0/PI*acos(v[2]);
928	–	azi = 180.0/PI*atan2(v[1], v[0]);
929	–	if (azi < 0.0) azi += 360.0;
930	–	for (li = 1; ab->lat[li].tmin <= pol; li++)
931	–	if (!ab->lat[li].nphis)
932	–	return(-1);
933	–	--li;
934	–	ndx = (int)((1./360.)aziab->lat[li].nphis + 0.5);
935	–	if (ndx >= ab->lat[li].nphis) ndx = 0;
936	–	while (li--)
937	–	ndx += ab->lat[li].nphis;
938	–	return(ndx);
939	–	}
940	–
941	–
942	–	static double
943	–	ab_getohm( /* get solid angle for this angle basis index */
944	–	int ndx,
945	–	void *p
946	–	)
947	–	{
948	–	ANGLE_BASIS ab = (ANGLE_BASIS )p;
949	–	int li;
950	–	double theta, theta1;
951	–
952	–	if ((ndx < 0) \| (ndx >= ab->nangles))
953	–	return(0);
954	–	for (li = 0; ndx >= ab->lat[li].nphis; li++)
955	–	ndx -= ab->lat[li].nphis;
956	–	theta1 = PI/180. * ab->lat[li+1].tmin;
957	–	if (ab->lat[li].nphis == 1) { /* special case */
958	–	if (ab->lat[li].tmin > FTINY)
959	–	error(USER, "unsupported BSDF coordinate system");
960	–	return(2.PI(1. - cos(theta1)));
961	–	}
962	–	theta = PI/180. * ab->lat[li].tmin;
963	–	return(2.PI(cos(theta) - cos(theta1))/(double)ab->lat[li].nphis);
964	–	}
965	–
966	–
967	–	static int
968	–	ab_getvecR( /* get reverse vector for this angle basis index */
969	–	FVECT v,
970	–	int ndx,
971	–	void *p
972	–	)
973	–	{
974	–	if (!ab_getvec(v, ndx, p))
975	–	return(0);
976	–
977	–	v[0] = -v[0];
978	–	v[1] = -v[1];
979	–	v[2] = -v[2];
980	–
981	–	return(1);
982	–	}
983	–
984	–
985	–	static int
986	–	ab_getndxR( /* get index corresponding to the reverse vector */
987	–	FVECT v,
988	–	void *p
989	–	)
990	–	{
991	–	FVECT v2;
992	–
993	–	v2[0] = -v[0];
994	–	v2[1] = -v[1];
995	–	v2[2] = -v[2];
996	–
997	–	return ab_getndx(v2, p);
998	–	}
999	–
1000	–
1001	–	static void
1002	–	load_angle_basis( /* load custom BSDF angle basis */
1003	–	ezxml_t wab
1004	–	)
1005	–	{
1006	–	char *abname = ezxml_txt(ezxml_child(wab, "AngleBasisName"));
1007	–	ezxml_t wbb;
1008	–	int i;
1009	–
1010	–	if (!abname \|\| !*abname)
1011	–	return;
1012	–	for (i = nabases; i--; )
1013	–	if (!strcasecmp(abname, abase_list[i].name))
1014	–	return; /* assume it's the same */
1015	–	if (nabases >= MAXABASES)
1016	–	error(INTERNAL, "too many angle bases");
1017	–	strcpy(abase_list[nabases].name, abname);
1018	–	abase_list[nabases].nangles = 0;
1019	–	for (i = 0, wbb = ezxml_child(wab, "AngleBasisBlock");
1020	–	wbb != NULL; i++, wbb = wbb->next) {
1021	–	if (i >= MAXLATS)
1022	–	error(INTERNAL, "too many latitudes in custom basis");
1023	–	abase_list[nabases].lat[i+1].tmin = atof(ezxml_txt(
1024	–	ezxml_child(ezxml_child(wbb,
1025	–	"ThetaBounds"), "UpperTheta")));
1026	–	if (!i)
1027	–	abase_list[nabases].lat[i].tmin =
1028	–	-abase_list[nabases].lat[i+1].tmin;
1029	–	else if (!fequal(atof(ezxml_txt(ezxml_child(ezxml_child(wbb,
1030	–	"ThetaBounds"), "LowerTheta"))),
1031	–	abase_list[nabases].lat[i].tmin))
1032	–	error(WARNING, "theta values disagree in custom basis");
1033	–	abase_list[nabases].nangles +=
1034	–	abase_list[nabases].lat[i].nphis =
1035	–	atoi(ezxml_txt(ezxml_child(wbb, "nPhis")));
1036	–	}
1037	–	abase_list[nabases++].lat[i].nphis = 0;
1038	–	}
1039	–
1040	–
1041	–	static void
1042	–	load_geometry( /* load geometric dimensions and description (if any) */
1043	–	struct BSDF_data *dp,
1044	–	ezxml_t wdb
1045	–	)
1046	–	{
1047	–	ezxml_t geom;
1048	–	double cfact;
1049	–	const char fmt, mgfstr;
1050	–
1051	–	dp->dim[0] = dp->dim[1] = dp->dim[2] = 0;
1052	–	dp->mgf = NULL;
1053	–	if ((geom = ezxml_child(wdb, "Width")) != NULL)
1054	–	dp->dim[0] = atof(ezxml_txt(geom)) *
1055	–	to_meters(ezxml_attr(geom, "unit"));
1056	–	if ((geom = ezxml_child(wdb, "Height")) != NULL)
1057	–	dp->dim[1] = atof(ezxml_txt(geom)) *
1058	–	to_meters(ezxml_attr(geom, "unit"));
1059	–	if ((geom = ezxml_child(wdb, "Thickness")) != NULL)
1060	–	dp->dim[2] = atof(ezxml_txt(geom)) *
1061	–	to_meters(ezxml_attr(geom, "unit"));
1062	–	if ((geom = ezxml_child(wdb, "Geometry")) == NULL \|\|
1063	–	(mgfstr = ezxml_txt(geom)) == NULL)
1064	–	return;
1065	–	if ((fmt = ezxml_attr(geom, "format")) != NULL &&
1066	–	strcasecmp(fmt, "MGF")) {
1067	–	sprintf(errmsg, "unrecognized geometry format '%s'", fmt);
1068	–	error(WARNING, errmsg);
1069	–	return;
1070	–	}
1071	–	cfact = to_meters(ezxml_attr(geom, "unit"));
1072	–	dp->mgf = (char *)malloc(strlen(mgfstr)+32);
1073	–	if (dp->mgf == NULL)
1074	–	error(SYSTEM, "out of memory in load_geometry");
1075	–	if (cfact < 0.99 \|\| cfact > 1.01)
1076	–	sprintf(dp->mgf, "xf -s %.5f\n%s\nxf\n", cfact, mgfstr);
1077	–	else
1078	–	strcpy(dp->mgf, mgfstr);
1079	–	}
1080	–
1081	–
1082	–	static void
1083	–	load_bsdf_data( /* load BSDF distribution for this wavelength */
1084	–	struct BSDF_data *dp,
1085	–	ezxml_t wdb
1086	–	)
1087	–	{
1088	–	char *cbasis = ezxml_txt(ezxml_child(wdb,"ColumnAngleBasis"));
1089	–	char *rbasis = ezxml_txt(ezxml_child(wdb,"RowAngleBasis"));
1090	–	char *sdata;
1091	–	int i;
1092	–
1093	–	if ((!cbasis \|\| !cbasis) \| (!rbasis \|\| !rbasis)) {
1094	–	error(WARNING, "missing column/row basis for BSDF");
1095	–	return;
1096	–	}
1097	–	for (i = nabases; i--; )
1098	–	if (!strcasecmp(cbasis, abase_list[i].name)) {
1099	–	dp->ninc = abase_list[i].nangles;
1100	–	dp->ib_priv = (void *)&abase_list[i];
1101	–	dp->ib_vec = ab_getvecR;
1102	–	dp->ib_ndx = ab_getndxR;
1103	–	dp->ib_ohm = ab_getohm;
1104	–	break;
1105	–	}
1106	–	if (i < 0) {
1107	–	sprintf(errmsg, "undefined ColumnAngleBasis '%s'", cbasis);
1108	–	error(WARNING, errmsg);
1109	–	return;
1110	–	}
1111	–	for (i = nabases; i--; )
1112	–	if (!strcasecmp(rbasis, abase_list[i].name)) {
1113	–	dp->nout = abase_list[i].nangles;
1114	–	dp->ob_priv = (void *)&abase_list[i];
1115	–	dp->ob_vec = ab_getvec;
1116	–	dp->ob_ndx = ab_getndx;
1117	–	dp->ob_ohm = ab_getohm;
1118	–	break;
1119	–	}
1120	–	if (i < 0) {
1121	–	sprintf(errmsg, "undefined RowAngleBasis '%s'", rbasis);
1122	–	error(WARNING, errmsg);
1123	–	return;
1124	–	}
1125	–	/* read BSDF data */
1126	–	sdata = ezxml_txt(ezxml_child(wdb,"ScatteringData"));
1127	–	if (!sdata \|\| !*sdata) {
1128	–	error(WARNING, "missing BSDF ScatteringData");
1129	–	return;
1130	–	}
1131	–	dp->bsdf = (float )malloc(sizeof(float)dp->ninc*dp->nout);
1132	–	if (dp->bsdf == NULL)
1133	–	error(SYSTEM, "out of memory in load_bsdf_data");
1134	–	for (i = 0; i < dp->ninc*dp->nout; i++) {
1135	–	char *sdnext = fskip(sdata);
1136	–	if (sdnext == NULL) {
1137	–	error(WARNING, "bad/missing BSDF ScatteringData");
1138	–	free(dp->bsdf); dp->bsdf = NULL;
1139	–	return;
1140	–	}
1141	–	while (sdnext && isspace(sdnext))
1142	–	sdnext++;
1143	–	if (*sdnext == ',') sdnext++;
1144	–	dp->bsdf[i] = atof(sdata);
1145	–	sdata = sdnext;
1146	–	}
1147	–	while (isspace(*sdata))
1148	–	sdata++;
1149	–	if (*sdata) {
1150	–	sprintf(errmsg, "%d extra characters after BSDF ScatteringData",
1151	–	(int)strlen(sdata));
1152	–	error(WARNING, errmsg);
1153	–	}
1154	–	}
1155	–
1156	–
1157	–	static int
1158	–	check_bsdf_data( /* check that BSDF data is sane */
1159	–	struct BSDF_data *dp
1160	–	)
1161	–	{
1162	–	double omega_iarr, omega_oarr;
1163	–	double dom, contrib, hemi_total, full_total;
1164	–	int nneg;
1165	–	FVECT v;
1166	–	int i, o;
1167	–
1168	–	if (dp == NULL \|\| dp->bsdf == NULL)
1169	–	return(0);
1170	–	omega_iarr = (double *)calloc(dp->ninc, sizeof(double));
1171	–	omega_oarr = (double *)calloc(dp->nout, sizeof(double));
1172	–	if ((omega_iarr == NULL) \| (omega_oarr == NULL))
1173	–	error(SYSTEM, "out of memory in check_bsdf_data");
1174	–	/* incoming projected solid angles */
1175	–	hemi_total = .0;
1176	–	for (i = dp->ninc; i--; ) {
1177	–	dom = getBSDF_incohm(dp,i);
1178	–	if (dom <= .0) {
1179	–	error(WARNING, "zero/negative incoming solid angle");
1180	–	continue;
1181	–	}
1182	–	if (!getBSDF_incvec(v,dp,i) \|\| v[2] > FTINY) {
1183	–	error(WARNING, "illegal incoming BSDF direction");
1184	–	free(omega_iarr); free(omega_oarr);
1185	–	return(0);
1186	–	}
1187	–	hemi_total += omega_iarr[i] = dom * -v[2];
1188	–	}
1189	–	if ((hemi_total > 1.02PI) \| (hemi_total < 0.98PI)) {
1190	–	sprintf(errmsg, "incoming BSDF hemisphere off by %.1f%%",
1191	–	100.*(hemi_total/PI - 1.));
1192	–	error(WARNING, errmsg);
1193	–	}
1194	–	dom = PI / hemi_total; /* fix normalization */
1195	–	for (i = dp->ninc; i--; )
1196	–	omega_iarr[i] *= dom;
1197	–	/* outgoing projected solid angles */
1198	–	hemi_total = .0;
1199	–	for (o = dp->nout; o--; ) {
1200	–	dom = getBSDF_outohm(dp,o);
1201	–	if (dom <= .0) {
1202	–	error(WARNING, "zero/negative outgoing solid angle");
1203	–	continue;
1204	–	}
1205	–	if (!getBSDF_outvec(v,dp,o) \|\| v[2] < -FTINY) {
1206	–	error(WARNING, "illegal outgoing BSDF direction");
1207	–	free(omega_iarr); free(omega_oarr);
1208	–	return(0);
1209	–	}
1210	–	hemi_total += omega_oarr[o] = dom * v[2];
1211	–	}
1212	–	if ((hemi_total > 1.02PI) \| (hemi_total < 0.98PI)) {
1213	–	sprintf(errmsg, "outgoing BSDF hemisphere off by %.1f%%",
1214	–	100.*(hemi_total/PI - 1.));
1215	–	error(WARNING, errmsg);
1216	–	}
1217	–	dom = PI / hemi_total; /* fix normalization */
1218	–	for (o = dp->nout; o--; )
1219	–	omega_oarr[o] *= dom;
1220	–	nneg = 0; /* check outgoing totals */
1221	–	for (i = 0; i < dp->ninc; i++) {
1222	–	hemi_total = .0;
1223	–	for (o = dp->nout; o--; ) {
1224	–	double f = BSDF_value(dp,i,o);
1225	–	if (f >= .0)
1226	–	hemi_total += f*omega_oarr[o];
1227	–	else {
1228	–	nneg += (f < -FTINY);
1229	–	BSDF_value(dp,i,o) = .0f;
1230	–	}
1231	–	}
1232	–	if (hemi_total > 1.01) {
1233	–	sprintf(errmsg,
1234	–	"incoming BSDF direction %d passes %.1f%% of light",
1235	–	i, 100.*hemi_total);
1236	–	error(WARNING, errmsg);
1237	–	}
1238	–	}
1239	–	if (nneg) {
1240	–	sprintf(errmsg, "%d negative BSDF values (ignored)", nneg);
1241	–	error(WARNING, errmsg);
1242	–	}
1243	–	full_total = .0; /* reverse roles and check again */
1244	–	for (o = 0; o < dp->nout; o++) {
1245	–	hemi_total = .0;
1246	–	for (i = dp->ninc; i--; )
1247	–	hemi_total += BSDF_value(dp,i,o) * omega_iarr[i];
1248	–
1249	–	if (hemi_total > 1.01) {
1250	–	sprintf(errmsg,
1251	–	"outgoing BSDF direction %d collects %.1f%% of light",
1252	–	o, 100.*hemi_total);
1253	–	error(WARNING, errmsg);
1254	–	}
1255	–	full_total += hemi_total*omega_oarr[o];
1256	–	}
1257	–	full_total /= PI;
1258	–	if (full_total > 1.00001) {
1259	–	sprintf(errmsg, "BSDF transfers %.4f%% of light",
1260	–	100.*full_total);
1261	–	error(WARNING, errmsg);
1262	–	}
1263	–	free(omega_iarr); free(omega_oarr);
1264	–	return(1);
1265	–	}
1266	–
1267	–
1268	–	struct BSDF_data *
1269	–	load_BSDF( /* load BSDF data from file */
1270	–	char *fname
1271	–	)
1272	–	{
1273	–	char *path;
1274	–	ezxml_t fl, wtl, wld, wdb;
1275	–	struct BSDF_data *dp;
1276	–
1277	–	path = getpath(fname, getrlibpath(), R_OK);
1278	–	if (path == NULL) {
1279	–	sprintf(errmsg, "cannot find BSDF file \"%s\"", fname);
1280	–	error(WARNING, errmsg);
1281	–	return(NULL);
1282	–	}
1283	–	fl = ezxml_parse_file(path);
1284	–	if (fl == NULL) {
1285	–	sprintf(errmsg, "cannot open BSDF \"%s\"", path);
1286	–	error(WARNING, errmsg);
1287	–	return(NULL);
1288	–	}
1289	–	if (ezxml_error(fl)[0]) {
1290	–	sprintf(errmsg, "BSDF \"%s\" %s", path, ezxml_error(fl));
1291	–	error(WARNING, errmsg);
1292	–	ezxml_free(fl);
1293	–	return(NULL);
1294	–	}
1295	–	if (strcmp(ezxml_name(fl), "WindowElement")) {
1296	–	sprintf(errmsg,
1297	–	"BSDF \"%s\": top level node not 'WindowElement'",
1298	–	path);
1299	–	error(WARNING, errmsg);
1300	–	ezxml_free(fl);
1301	–	return(NULL);
1302	–	}
1303	–	wtl = ezxml_child(ezxml_child(fl, "Optical"), "Layer");
1304	–	if (strcasecmp(ezxml_txt(ezxml_child(ezxml_child(wtl,
1305	–	"DataDefinition"), "IncidentDataStructure")),
1306	–	"Columns")) {
1307	–	sprintf(errmsg,
1308	–	"BSDF \"%s\": unsupported IncidentDataStructure",
1309	–	path);
1310	–	error(WARNING, errmsg);
1311	–	ezxml_free(fl);
1312	–	return(NULL);
1313	–	}
1314	–	load_angle_basis(ezxml_child(ezxml_child(wtl,
1315	–	"DataDefinition"), "AngleBasis"));
1316	–	dp = (struct BSDF_data *)calloc(1, sizeof(struct BSDF_data));
1317	–	load_geometry(dp, ezxml_child(wtl, "Material"));
1318	–	for (wld = ezxml_child(wtl, "WavelengthData");
1319	–	wld != NULL; wld = wld->next) {
1320	–	if (strcasecmp(ezxml_txt(ezxml_child(wld,"Wavelength")),
1321	–	"Visible"))
1322	–	continue;
1323	–	for (wdb = ezxml_child(wld, "WavelengthDataBlock");
1324	–	wdb != NULL; wdb = wdb->next)
1325	–	if (!strcasecmp(ezxml_txt(ezxml_child(wdb,
1326	–	"WavelengthDataDirection")),
1327	–	"Transmission Front"))
1328	–	break;
1329	–	if (wdb != NULL) { /* load front BTDF */
1330	–	load_bsdf_data(dp, wdb);
1331	–	break; /* ignore the rest */
1332	–	}
1333	–	}
1334	–	ezxml_free(fl); /* done with XML file */
1335	–	if (!check_bsdf_data(dp)) {
1336	–	sprintf(errmsg, "bad/missing BTDF data in \"%s\"", path);
1337	–	error(WARNING, errmsg);
1338	–	free_BSDF(dp);
1339	–	dp = NULL;
1340	–	}
1341	–	return(dp);
1342	–	}
1343	–
1344	–
1345	–	void
1346	–	free_BSDF( /* free BSDF data structure */
1347	–	struct BSDF_data *b
1348	–	)
1349	–	{
1350	–	if (b == NULL)
1351	–	return;
1352	–	if (b->mgf != NULL)
1353	–	free(b->mgf);
1354	–	if (b->bsdf != NULL)
1355	–	free(b->bsdf);
1356	–	free(b);
1357	–	}
1358	–
1359	–
1360	–	int
1361	–	r_BSDF_incvec( /* compute random input vector at given location */
1362	–	FVECT v,
1363	–	struct BSDF_data *b,
1364	–	int i,
1365	–	double rv,
1366	–	MAT4 xm
1367	–	)
1368	–	{
1369	–	FVECT pert;
1370	–	double rad;
1371	–	int j;
1372	–
1373	–	if (!getBSDF_incvec(v, b, i))
1374	–	return(0);
1375	–	rad = sqrt(getBSDF_incohm(b, i) / PI);
1376	–	multisamp(pert, 3, rv);
1377	–	for (j = 0; j < 3; j++)
1378	–	v[j] += rad(2.pert[j] - 1.);
1379	–	if (xm != NULL)
1380	–	multv3(v, v, xm);
1381	–	return(normalize(v) != 0.0);
1382	–	}
1383	–
1384	–
1385	–	int
1386	–	r_BSDF_outvec( /* compute random output vector at given location */
1387	–	FVECT v,
1388	–	struct BSDF_data *b,
1389	–	int o,
1390	–	double rv,
1391	–	MAT4 xm
1392	–	)
1393	–	{
1394	–	FVECT pert;
1395	–	double rad;
1396	–	int j;
1397	–
1398	–	if (!getBSDF_outvec(v, b, o))
1399	–	return(0);
1400	–	rad = sqrt(getBSDF_outohm(b, o) / PI);
1401	–	multisamp(pert, 3, rv);
1402	–	for (j = 0; j < 3; j++)
1403	–	v[j] += rad(2.pert[j] - 1.);
1404	–	if (xm != NULL)
1405	–	multv3(v, v, xm);
1406	–	return(normalize(v) != 0.0);
1407	–	}
1408	–
1409	–
1410	–	static int
1411	–	addrot( /* compute rotation (x,y,z) => (xp,yp,zp) */
1412	–	char *xfarg[],
1413	–	FVECT xp,
1414	–	FVECT yp,
1415	–	FVECT zp
1416	–	)
1417	–	{
1418	–	static char bufs[3][16];
1419	–	int bn = 0;
1420	–	char **xfp = xfarg;
1421	–	double theta;
1422	–
1423	–	if (yp[2]yp[2] + zp[2]zp[2] < 2.FTINYFTINY) {
1424	–	/* Special case for X' along Z-axis */
1425	–	theta = -atan2(yp[0], yp[1]);
1426	–	*xfp++ = "-ry";
1427	–	*xfp++ = xp[2] < 0.0 ? "90" : "-90";
1428	–	*xfp++ = "-rz";
1429	–	sprintf(bufs[bn], "%f", theta*(180./PI));
1430	–	*xfp++ = bufs[bn++];
1431	–	return(xfp - xfarg);
1432	–	}
1433	–	theta = atan2(yp[2], zp[2]);
1434	–	if (!FEQ(theta,0.0)) {
1435	–	*xfp++ = "-rx";
1436	–	sprintf(bufs[bn], "%f", theta*(180./PI));
1437	–	*xfp++ = bufs[bn++];
1438	–	}
1439	–	theta = asin(-xp[2]);
1440	–	if (!FEQ(theta,0.0)) {
1441	–	*xfp++ = "-ry";
1442	–	sprintf(bufs[bn], " %f", theta*(180./PI));
1443	–	*xfp++ = bufs[bn++];
1444	–	}
1445	–	theta = atan2(xp[1], xp[0]);
1446	–	if (!FEQ(theta,0.0)) {
1447	–	*xfp++ = "-rz";
1448	–	sprintf(bufs[bn], "%f", theta*(180./PI));
1449	–	*xfp++ = bufs[bn++];
1450	–	}
1451	–	*xfp = NULL;
1452	–	return(xfp - xfarg);
1453	–	}
1454	–
1455	–
1456	–	int
1457	–	getBSDF_xfm( /* compute BSDF orient. -> world orient. transform */
1458	–	MAT4 xm,
1459	–	FVECT nrm,
1460	–	UpDir ud,
1461	–	char *xfbuf
1462	–	)
1463	–	{
1464	–	char *xfargs[7];
1465	–	XF myxf;
1466	–	FVECT updir, xdest, ydest;
1467	–	int i;
1468	–
1469	–	updir[0] = updir[1] = updir[2] = 0.;
1470	–	switch (ud) {
1471	–	case UDzneg:
1472	–	updir[2] = -1.;
1473	–	break;
1474	–	case UDyneg:
1475	–	updir[1] = -1.;
1476	–	break;
1477	–	case UDxneg:
1478	–	updir[0] = -1.;
1479	–	break;
1480	–	case UDxpos:
1481	–	updir[0] = 1.;
1482	–	break;
1483	–	case UDypos:
1484	–	updir[1] = 1.;
1485	–	break;
1486	–	case UDzpos:
1487	–	updir[2] = 1.;
1488	–	break;
1489	–	case UDunknown:
1490	–	return(0);
1491	–	}
1492	–	fcross(xdest, updir, nrm);
1493	–	if (normalize(xdest) == 0.0)
1494	–	return(0);
1495	–	fcross(ydest, nrm, xdest);
1496	–	xf(&myxf, addrot(xfargs, xdest, ydest, nrm), xfargs);
1497	–	copymat4(xm, myxf.xfm);
1498	–	if (xfbuf == NULL)
1499	–	return(1);
1500	–	/* return xf arguments as well */
1501	–	for (i = 0; xfargs[i] != NULL; i++) {
1502	–	*xfbuf++ = ' ';
1503	–	strcpy(xfbuf, xfargs[i]);
1504	–	while (*xfbuf) ++xfbuf;
1505	–	}
1506	–	return(1);
1507	–	}
1508	–
1509	–	/######### END DEPRECATED ROUTINES #######/
1510	–	/################################################################/

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Comparing ray/src/common/bsdf.c (file contents): Revision 2.20 by greg, Mon Apr 11 03:47:46 2011 UTC vs. Revision 2.55 by greg, Thu May 10 22:55:35 2018 UTC

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Comparing ray/src/common/bsdf.c (file contents):
Revision 2.20 by greg, Mon Apr 11 03:47:46 2011 UTC vs.
Revision 2.55 by greg, Thu May 10 22:55:35 2018 UTC