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

Comparing ray/src/common/bsdf.c (file contents):
Revision 2.15 by greg, Fri Feb 18 00:40:25 2011 UTC vs.
Revision 2.48 by greg, Mon Mar 24 04:00:45 2014 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 *dp, 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	<	sprintf(SDerrorDetail, "Negative size in \"%s\"", dp->name);
100	<	dp->dim[0] = dp->dim[1] = dp->dim[2] = .0;
101	<	if ((geom = ezxml_child(wdb, "Width")) != NULL)
102	<	dp->dim[0] = atof(ezxml_txt(geom)) *
103	<	to_meters(ezxml_attr(geom, "unit"));
104	<	if ((geom = ezxml_child(wdb, "Height")) != NULL)
105	<	dp->dim[1] = atof(ezxml_txt(geom)) *
106	<	to_meters(ezxml_attr(geom, "unit"));
107	<	if ((geom = ezxml_child(wdb, "Thickness")) != NULL)
108	<	dp->dim[2] = atof(ezxml_txt(geom)) *
109	<	to_meters(ezxml_attr(geom, "unit"));
110	<	if ((dp->dim[0] < .0) \| (dp->dim[1] < .0) \| (dp->dim[2] < .0))
111	<	return SDEdata;
112	<	if ((geom = ezxml_child(wdb, "Geometry")) == NULL \|\|
113	<	(mgfstr = ezxml_txt(geom)) == NULL)
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	>	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, dp->name);
138	>	fmt, sd->name);
139		return SDEsupport;
140		}
141	<	cfact = to_meters(ezxml_attr(geom, "unit"));
142	<	dp->mgf = (char *)malloc(strlen(mgfstr)+32);
143	<	if (dp->mgf == NULL) {
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");
154		return SDEmemory;
155		}
156		if (cfact < 0.99 \|\| cfact > 1.01)
157	<	sprintf(dp->mgf, "xf -s %.5f\n%s\nxf\n", cfact, mgfstr);
157	>	sprintf(sd->mgf, "xf -s %.5f\n%s\nxf\n", cfact, mgfstr);
158		else
159	<	strcpy(dp->mgf, mgfstr);
159	>	strcpy(sd->mgf, mgfstr);
160		return SDEnone;
161		}
162
122	–
163		/* Load a BSDF struct from the given file (free first and keep name) */
164		SDError
165		SDloadFile(SDData sd, const char fname)
166		{
167		SDError lastErr;
168	<	ezxml_t fl;
168	>	ezxml_t fl, wtl;
169
170		if ((sd == NULL) \| (fname == NULL \|\| !*fname))
171		return SDEargument;
#	Line 142 \| Line 182 \| *SDloadFile(SDData sd, const char fname)*
182		ezxml_free(fl);
183		return SDEformat;
184		}
185	+	if (strcmp(ezxml_name(fl), "WindowElement")) {
186	+	sprintf(SDerrorDetail,
187	+	"BSDF \"%s\": top level node not 'WindowElement'",
188	+	sd->name);
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 layers'",
203	+	sd->name);
204	+	ezxml_free(fl);
205	+	return SDEformat;
206	+	}
207		/* load geometry if present */
208	<	if ((lastErr = SDloadGeometry(sd, fl)))
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, fl);
214	>	lastErr = SDloadTre(sd, wtl);
215		/* check our result */
216	<	switch (lastErr) {
217	<	case SDEformat:
218	<	case SDEdata:
154	<	case SDEsupport: /* possibly we just tried the wrong format */
155	<	lastErr = SDloadMtx(sd, fl);
156	<	break;
157	<	default: /* variable res. OK else serious error */
158	<	break;
159	<	}
216	>	if (lastErr == SDEsupport) /* try matrix BSDF if not tree data */
217	>	lastErr = SDloadMtx(sd, wtl);
218	>
219		/* done with XML file */
220		ezxml_free(fl);
221	<	/* return success or failure */
222	<	return lastErr;
221	>
222	>	if (lastErr) { /* was there a load error? */
223	>	SDfreeBSDF(sd);
224	>	return lastErr;
225	>	}
226	>	/* remove any insignificant components */
227	>	if (sd->rf != NULL && sd->rf->maxHemi <= .001) {
228	>	SDfreeSpectralDF(sd->rf); sd->rf = NULL;
229	>	}
230	>	if (sd->rb != NULL && sd->rb->maxHemi <= .001) {
231	>	SDfreeSpectralDF(sd->rb); sd->rb = NULL;
232	>	}
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		}
242
243		/* Allocate new spectral distribution function */
#	Line 187 \| 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 213 \| 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
321		/* Shorten file path to useable BSDF name, removing suffix */
322		void
323	<	SDclipName(char res[SDnameLn], const char *fname)
323	>	SDclipName(char res, const char fname)
324		{
325		const char cp, dot = NULL;
326
#	Line 237 \| Line 338 \| *SDclipName(char res[SDnameLn], const char fname)**
338
339		/* Initialize an unused BSDF struct (simply clears to zeroes) */
340		void
341	<	SDclearBSDF(SDData *sd)
341	>	SDclearBSDF(SDData sd, const char fname)
342		{
343	<	if (sd != NULL)
344	<	memset(sd, 0, sizeof(SDData));
343	>	if (sd == NULL)
344	>	return;
345	>	memset(sd, 0, sizeof(SDData));
346	>	if (fname == NULL)
347	>	return;
348	>	SDclipName(sd->name, fname);
349		}
350
351		/* Free data associated with BSDF struct */
#	Line 265 \| 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.clock = 0;
378	>	sd->rLambFront.spec.flags = 0;
379		sd->rLambBack.cieY = .0;
380	<	sd->rLambBack.spec.clock = 0;
380	>	sd->rLambBack.spec.flags = 0;
381		sd->tLamb.cieY = .0;
382	<	sd->tLamb.spec.clock = 0;
382	>	sd->tLamb.spec.flags = 0;
383		}
384
385		/* Find writeable BSDF by name, or allocate new cache entry if absent */
#	Line 298 \| 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 314 \| Line 423 \| *SDcacheFile(const char fname)**
423		return NULL;
424		SDerrorDetail[0] = '\0';
425		if ((sd = SDgetCache(fname)) == NULL) {
426	<	SDreportEnglish(SDEmemory, stderr);
426	>	SDreportError(SDEmemory, stderr);
427		return NULL;
428		}
429		if (!SDisLoaded(sd) && (ec = SDloadFile(sd, fname))) {
430	<	SDreportEnglish(ec, stderr);
430	>	SDreportError(ec, stderr);
431		SDfreeCache(sd);
432		return NULL;
433		}
#	Line 342 \| Line 451 \| *SDfreeCache(const SDData sd)**
451		for (sdl = SDcacheList; sdl != NULL; sdl = (sdLast=sdl)->next)
452		if (&sdl->bsdf == sd)
453		break;
454	<	if (sdl == NULL \|\| --sdl->refcnt)
454	>	if (sdl == NULL \|\| (sdl->refcnt -= (sdl->refcnt > 0)))
455		return; /* missing or still in use */
456		/* keep unreferenced data? */
457		if (SDisLoaded(sd) && SDretainSet) {
#	Line 352 \| Line 461 \| *SDfreeCache(const SDData sd)**
461		SDfreeCumulativeCache(sd->rf);
462		SDfreeCumulativeCache(sd->rb);
463		SDfreeCumulativeCache(sd->tf);
464	+	SDfreeCumulativeCache(sd->tb);
465		return;
466		}
467		/* remove from list and free */
#	Line 365 \| Line 475 \| *SDfreeCache(const SDData sd)**
475
476		/* Sample an individual BSDF component */
477		SDError
478	<	SDsampComponent(SDValue *sv, FVECT outVec, const FVECT inVec,
369	<	double randX, SDComponent *sdc)
478	>	SDsampComponent(SDValue sv, FVECT ioVec, double randX, SDComponent sdc)
479		{
480		float coef[SDmaxCh];
481		SDError ec;
482	+	FVECT inVec;
483		const SDCDst *cd;
484		double d;
485		int n;
486		/* check arguments */
487	<	if ((sv == NULL) \| (outVec == NULL) \| (inVec == NULL) \| (sdc == NULL))
487	>	if ((sv == NULL) \| (ioVec == NULL) \| (sdc == NULL))
488		return SDEargument;
489		/* get cumulative distribution */
490	+	VCOPY(inVec, ioVec);
491	+	sv->cieY = 0;
492		cd = (*sdc->func->getCDist)(inVec, sdc);
493	<	if (cd == NULL)
494	<	return SDEmemory;
495	<	if (cd->cTotal <= 1e-7) { /* anything to sample? */
493	>	if (cd != NULL)
494	>	sv->cieY = cd->cTotal;
495	>	if (sv->cieY <= 1e-6) { /* nothing to sample? */
496		sv->spec = c_dfcolor;
497	<	sv->cieY = .0;
386	<	memset(outVec, 0, 3*sizeof(double));
497	>	memset(ioVec, 0, 3*sizeof(double));
498		return SDEnone;
499		}
389	–	sv->cieY = cd->cTotal;
500		/* compute sample direction */
501	<	ec = (*sdc->func->sampCDist)(outVec, randX, cd);
501	>	ec = (*sdc->func->sampCDist)(ioVec, randX, cd);
502		if (ec)
503		return ec;
504		/* get BSDF color */
505	<	n = (*sdc->func->getBSDFs)(coef, outVec, inVec, sdc->dist);
505	>	n = (*sdc->func->getBSDFs)(coef, ioVec, inVec, sdc);
506		if (n <= 0) {
507		strcpy(SDerrorDetail, "BSDF sample value error");
508		return SDEinternal;
#	Line 417 \| Line 527 \| SDmultiSamp(double t[], int n, double randX)
527		unsigned nBits;
528		double scale;
529		bitmask_t ndx, coord[MS_MAXDIM];
530	<
530	>
531	>	if (n <= 0) /* check corner cases */
532	>	return;
533	>	if (randX < 0) randX = 0;
534	>	else if (randX >= 1.) randX = 0.999999999999999;
535	>	if (n == 1) {
536	>	t[0] = randX;
537	>	return;
538	>	}
539		while (n > MS_MAXDIM) /* punt for higher dimensions */
540	<	t[--n] = drand48();
540	>	t[--n] = rand()*(1./(RAND_MAX+.5));
541		nBits = (8*sizeof(bitmask_t) - 1) / n;
542		ndx = randX * (double)((bitmask_t)1 << (nBits*n));
543		/* get coordinate on Hilbert curve */
#	Line 427 \| Line 545 \| SDmultiSamp(double t[], int n, double randX)
545		/* convert back to [0,1) range */
546		scale = 1. / (double)((bitmask_t)1 << nBits);
547		while (n--)
548	<	t[n] = scale * ((double)coord[n] + drand48());
548	>	t[n] = scale * ((double)coord[n] + rand()*(1./(RAND_MAX+.5)));
549		}
550
551		#undef MS_MAXDIM
#	Line 440 \| Line 558 \| SDdiffuseSamp(FVECT outVec, int outFront, double randX
558		SDmultiSamp(outVec, 2, randX);
559		SDsquare2disk(outVec, outVec[0], outVec[1]);
560		outVec[2] = 1. - outVec[0]outVec[0] - outVec[1]outVec[1];
561	<	if (outVec[2] > .0) /* a bit of paranoia */
444	<	outVec[2] = sqrt(outVec[2]);
561	>	outVec[2] = sqrt(outVec[2]*(outVec[2]>0));
562		if (!outFront) /* going out back? */
563		outVec[2] = -outVec[2];
564		}
565
566		/* Query projected solid angle coverage for non-diffuse BSDF direction */
567		SDError
568	<	SDsizeBSDF(double projSA, const FVECT vec, int qflags, const SDData sd)
568	>	SDsizeBSDF(double projSA, const FVECT v1, const RREAL v2,
569	>	int qflags, const SDData *sd)
570		{
571	<	SDSpectralDF *rdf;
571	>	SDSpectralDF rdf, tdf;
572		SDError ec;
573		int i;
574		/* check arguments */
575	<	if ((projSA == NULL) \| (vec == NULL) \| (sd == NULL))
575	>	if ((projSA == NULL) \| (v1 == NULL) \| (sd == NULL))
576		return SDEargument;
577		/* initialize extrema */
578	<	switch (qflags & SDqueryMin+SDqueryMax) {
578	>	switch (qflags) {
579		case SDqueryMax:
580		projSA[0] = .0;
581		break;
#	Line 470 \| Line 588 \| *SDsizeBSDF(double projSA, const FVECT vec, int qflags**
588		case 0:
589		return SDEargument;
590		}
591	<	if (vec[2] > .0) /* front surface query? */
591	>	if (v1[2] > 0) { /* front surface query? */
592		rdf = sd->rf;
593	<	else
593	>	tdf = (sd->tf != NULL) ? sd->tf : sd->tb;
594	>	} else {
595		rdf = sd->rb;
596	+	tdf = (sd->tb != NULL) ? sd->tb : sd->tf;
597	+	}
598	+	if (v2 != NULL) /* bidirectional? */
599	+	if (v1[2] > 0 ^ v2[2] > 0)
600	+	rdf = NULL;
601	+	else
602	+	tdf = NULL;
603		ec = SDEdata; /* run through components */
604		for (i = (rdf==NULL) ? 0 : rdf->ncomp; i--; ) {
605	<	ec = (*rdf->comp[i].func->queryProjSA)(projSA, vec, qflags,
606	<	rdf->comp[i].dist);
605	>	ec = (*rdf->comp[i].func->queryProjSA)(projSA, v1, v2,
606	>	qflags, &rdf->comp[i]);
607		if (ec)
608		return ec;
609		}
610	<	for (i = (sd->tf==NULL) ? 0 : sd->tf->ncomp; i--; ) {
611	<	ec = (*sd->tf->comp[i].func->queryProjSA)(projSA, vec, qflags,
612	<	sd->tf->comp[i].dist);
610	>	for (i = (tdf==NULL) ? 0 : tdf->ncomp; i--; ) {
611	>	ec = (*tdf->comp[i].func->queryProjSA)(projSA, v1, v2,
612	>	qflags, &tdf->comp[i]);
613		if (ec)
614		return ec;
615		}
616	<	return ec;
616	>	if (ec) { /* all diffuse? */
617	>	projSA[0] = M_PI;
618	>	if (qflags == SDqueryMin+SDqueryMax)
619	>	projSA[1] = M_PI;
620	>	} else if (qflags == SDqueryMin+SDqueryMax && projSA[0] > projSA[1])
621	>	projSA[0] = projSA[1];
622	>	return SDEnone;
623		}
624
625		/* Return BSDF for the given incident and scattered ray vectors */
#	Line 502 \| Line 634 \| *SDevalBSDF(SDValue sv, const FVECT outVec, const FVEC**
634		if ((sv == NULL) \| (outVec == NULL) \| (inVec == NULL) \| (sd == NULL))
635		return SDEargument;
636		/* whose side are we on? */
637	<	inFront = (inVec[2] > .0);
638	<	outFront = (outVec[2] > .0);
637	>	inFront = (inVec[2] > 0);
638	>	outFront = (outVec[2] > 0);
639		/* start with diffuse portion */
640		if (inFront & outFront) {
641		*sv = sd->rLambFront;
#	Line 511 \| Line 643 \| *SDevalBSDF(SDValue sv, const FVECT outVec, const FVEC**
643		} else if (!(inFront \| outFront)) {
644		*sv = sd->rLambBack;
645		sdf = sd->rb;
646	<	} else /* inFront ^ outFront */ {
646	>	} else if (inFront) {
647		*sv = sd->tLamb;
648	<	sdf = sd->tf;
648	>	sdf = (sd->tf != NULL) ? sd->tf : sd->tb;
649	>	} else /* inBack */ {
650	>	*sv = sd->tLamb;
651	>	sdf = (sd->tb != NULL) ? sd->tb : sd->tf;
652		}
653		sv->cieY *= 1./M_PI;
654		/* add non-diffuse components */
655		i = (sdf != NULL) ? sdf->ncomp : 0;
656		while (i-- > 0) {
657		nch = (*sdf->comp[i].func->getBSDFs)(coef, outVec, inVec,
658	<	sdf->comp[i].dist);
658	>	&sdf->comp[i]);
659		while (nch-- > 0) {
660		c_cmix(&sv->spec, sv->cieY, &sv->spec,
661		coef[nch], &sdf->comp[i].cspec[nch]);
#	Line 537 \| Line 672 \| double
672		SDdirectHemi(const FVECT inVec, int sflags, const SDData *sd)
673		{
674		double hsum;
675	<	SDSpectralDF *rdf;
675	>	SDSpectralDF rdf, tdf;
676		const SDCDst *cd;
677		int i;
678		/* check arguments */
679		if ((inVec == NULL) \| (sd == NULL))
680		return .0;
681		/* gather diffuse components */
682	<	if (inVec[2] > .0) {
682	>	if (inVec[2] > 0) {
683		hsum = sd->rLambFront.cieY;
684		rdf = sd->rf;
685	+	tdf = (sd->tf != NULL) ? sd->tf : sd->tb;
686		} else /* !inFront */ {
687		hsum = sd->rLambBack.cieY;
688		rdf = sd->rb;
689	+	tdf = (sd->tb != NULL) ? sd->tb : sd->tf;
690		}
691		if ((sflags & SDsampDf+SDsampR) != SDsampDf+SDsampR)
692		hsum = .0;
693		if ((sflags & SDsampDf+SDsampT) == SDsampDf+SDsampT)
694		hsum += sd->tLamb.cieY;
695		/* gather non-diffuse components */
696	<	i = ((sflags & SDsampSp+SDsampR) == SDsampSp+SDsampR &&
697	<	rdf != NULL) ? rdf->ncomp : 0;
696	>	i = (((sflags & SDsampSp+SDsampR) == SDsampSp+SDsampR) &
697	>	(rdf != NULL)) ? rdf->ncomp : 0;
698		while (i-- > 0) { /* non-diffuse reflection */
699		cd = (*rdf->comp[i].func->getCDist)(inVec, &rdf->comp[i]);
700		if (cd != NULL)
701		hsum += cd->cTotal;
702		}
703	<	i = ((sflags & SDsampSp+SDsampT) == SDsampSp+SDsampT &&
704	<	sd->tf != NULL) ? sd->tf->ncomp : 0;
703	>	i = (((sflags & SDsampSp+SDsampT) == SDsampSp+SDsampT) &
704	>	(tdf != NULL)) ? tdf->ncomp : 0;
705		while (i-- > 0) { /* non-diffuse transmission */
706	<	cd = (*sd->tf->comp[i].func->getCDist)(inVec, &sd->tf->comp[i]);
706	>	cd = (*tdf->comp[i].func->getCDist)(inVec, &tdf->comp[i]);
707		if (cd != NULL)
708		hsum += cd->cTotal;
709		}
#	Line 575 \| Line 712 \| SDdirectHemi(const FVECT inVec, int sflags, const SDDa
712
713		/* Sample BSDF direction based on the given random variable */
714		SDError
715	<	SDsampBSDF(SDValue *sv, FVECT outVec, const FVECT inVec,
579	<	double randX, int sflags, const SDData *sd)
715	>	SDsampBSDF(SDValue sv, FVECT ioVec, double randX, int sflags, const SDData sd)
716		{
717		SDError ec;
718	+	FVECT inVec;
719		int inFront;
720	<	SDSpectralDF *rdf;
720	>	SDSpectralDF rdf, tdf;
721		double rdiff;
722		float coef[SDmaxCh];
723		int i, j, n, nr;
724		SDComponent *sdc;
725		const SDCDst **cdarr = NULL;
726		/* check arguments */
727	<	if ((sv == NULL) \| (outVec == NULL) \| (inVec == NULL) \| (sd == NULL) \|
728	<	(randX < .0) \| (randX >= 1.))
727	>	if ((sv == NULL) \| (ioVec == NULL) \| (sd == NULL) \|
728	>	(randX < 0) \| (randX >= 1.))
729		return SDEargument;
730		/* whose side are we on? */
731	<	inFront = (inVec[2] > .0);
731	>	VCOPY(inVec, ioVec);
732	>	inFront = (inVec[2] > 0);
733		/* remember diffuse portions */
734		if (inFront) {
735		*sv = sd->rLambFront;
736		rdf = sd->rf;
737	+	tdf = (sd->tf != NULL) ? sd->tf : sd->tb;
738		} else /* !inFront */ {
739		*sv = sd->rLambBack;
740		rdf = sd->rb;
741	+	tdf = (sd->tb != NULL) ? sd->tb : sd->tf;
742		}
743		if ((sflags & SDsampDf+SDsampR) != SDsampDf+SDsampR)
744		sv->cieY = .0;
#	Line 606 \| Line 746 \| *SDsampBSDF(SDValue sv, FVECT outVec, const FVECT inVe**
746		if ((sflags & SDsampDf+SDsampT) == SDsampDf+SDsampT)
747		sv->cieY += sd->tLamb.cieY;
748		/* gather non-diffuse components */
749	<	i = nr = ((sflags & SDsampSp+SDsampR) == SDsampSp+SDsampR &&
750	<	rdf != NULL) ? rdf->ncomp : 0;
751	<	j = ((sflags & SDsampSp+SDsampT) == SDsampSp+SDsampT &&
752	<	sd->tf != NULL) ? sd->tf->ncomp : 0;
749	>	i = nr = (((sflags & SDsampSp+SDsampR) == SDsampSp+SDsampR) &
750	>	(rdf != NULL)) ? rdf->ncomp : 0;
751	>	j = (((sflags & SDsampSp+SDsampT) == SDsampSp+SDsampT) &
752	>	(tdf != NULL)) ? tdf->ncomp : 0;
753		n = i + j;
754		if (n > 0 && (cdarr = (const SDCDst *)malloc(nsizeof(SDCDst *))) == NULL)
755		return SDEmemory;
756		while (j-- > 0) { /* non-diffuse transmission */
757	<	cdarr[i+j] = (*sd->tf->comp[j].func->getCDist)(inVec, &sd->tf->comp[j]);
758	<	if (cdarr[i+j] == NULL) {
759	<	free(cdarr);
620	<	return SDEmemory;
621	<	}
757	>	cdarr[i+j] = (*tdf->comp[j].func->getCDist)(inVec, &tdf->comp[j]);
758	>	if (cdarr[i+j] == NULL)
759	>	cdarr[i+j] = &SDemptyCD;
760		sv->cieY += cdarr[i+j]->cTotal;
761		}
762		while (i-- > 0) { /* non-diffuse reflection */
763		cdarr[i] = (*rdf->comp[i].func->getCDist)(inVec, &rdf->comp[i]);
764	<	if (cdarr[i] == NULL) {
765	<	free(cdarr);
766	<	return SDEmemory;
767	<	}
630	<	sv->cieY += cdarr[i]->cTotal;
764	>	if (cdarr[i] == NULL)
765	>	cdarr[i] = &SDemptyCD;
766	>	else
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, 3*sizeof(double));
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 646 \| 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 689 \| Line 826 \| SDcompXform(RREAL vMtx[3][3], const FVECT sNrm, const
826		if ((vMtx == NULL) \| (sNrm == NULL) \| (uVec == NULL))
827		return SDEargument;
828		VCOPY(vMtx[2], sNrm);
829	<	if (normalize(vMtx[2]) == .0)
829	>	if (normalize(vMtx[2]) == 0)
830		return SDEargument;
831		fcross(vMtx[0], uVec, vMtx[2]);
832	<	if (normalize(vMtx[0]) == .0)
832	>	if (normalize(vMtx[0]) == 0)
833		return SDEargument;
834		fcross(vMtx[1], vMtx[2], vMtx[0]);
835		return SDEnone;
#	Line 712 \| Line 849 \| SDinvXform(RREAL iMtx[3][3], RREAL vMtx[3][3])
849		mTmp[0][1] = vMtx[2][1]vMtx[0][2] - vMtx[2][2]vMtx[0][1];
850		mTmp[0][2] = vMtx[1][2]vMtx[0][1] - vMtx[1][1]vMtx[0][2];
851		d = vMtx[0][0]mTmp[0][0] + vMtx[1][0]mTmp[0][1] + vMtx[2][0]*mTmp[0][2];
852	<	if (d == .0) {
852	>	if (d == 0) {
853		strcpy(SDerrorDetail, "Zero determinant in matrix inversion");
854		return SDEargument;
855		}
#	Line 739 \| Line 876 \| SDmapDir(FVECT resVec, RREAL vMtx[3][3], const FVECT i
876		if (vMtx == NULL) { /* assume they just want to normalize */
877		if (resVec != inpVec)
878		VCOPY(resVec, inpVec);
879	<	return (normalize(resVec) > .0) ? SDEnone : SDEargument;
879	>	return (normalize(resVec) > 0) ? SDEnone : SDEargument;
880		}
881		vTmp[0] = DOT(vMtx[0], inpVec);
882		vTmp[1] = DOT(vMtx[1], inpVec);
883		vTmp[2] = DOT(vMtx[2], inpVec);
884	<	if (normalize(vTmp) == .0)
884	>	if (normalize(vTmp) == 0)
885		return SDEargument;
886		VCOPY(resVec, vTmp);
887		return SDEnone;
888		}
752	–
753	–	/################################################################/
754	–	/######### DEPRECATED ROUTINES AWAITING PERMANENT REMOVAL #######/
755	–
756	–	/*
757	–	* Routines for handling BSDF data
758	–	*/
759	–
760	–	#include "standard.h"
761	–	#include "paths.h"
762	–	#include <ctype.h>
763	–
764	–	#define MAXLATS 46 /* maximum number of latitudes */
765	–
766	–	/* BSDF angle specification */
767	–	typedef struct {
768	–	char name[64]; /* basis name */
769	–	int nangles; /* total number of directions */
770	–	struct {
771	–	float tmin; /* starting theta */
772	–	short nphis; /* number of phis (0 term) */
773	–	} lat[MAXLATS+1]; /* latitudes */
774	–	} ANGLE_BASIS;
775	–
776	–	#define MAXABASES 7 /* limit on defined bases */
777	–
778	–	static ANGLE_BASIS abase_list[MAXABASES] = {
779	–	{
780	–	"LBNL/Klems Full", 145,
781	–	{ {-5., 1},
782	–	{5., 8},
783	–	{15., 16},
784	–	{25., 20},
785	–	{35., 24},
786	–	{45., 24},
787	–	{55., 24},
788	–	{65., 16},
789	–	{75., 12},
790	–	{90., 0} }
791	–	}, {
792	–	"LBNL/Klems Half", 73,
793	–	{ {-6.5, 1},
794	–	{6.5, 8},
795	–	{19.5, 12},
796	–	{32.5, 16},
797	–	{46.5, 20},
798	–	{61.5, 12},
799	–	{76.5, 4},
800	–	{90., 0} }
801	–	}, {
802	–	"LBNL/Klems Quarter", 41,
803	–	{ {-9., 1},
804	–	{9., 8},
805	–	{27., 12},
806	–	{46., 12},
807	–	{66., 8},
808	–	{90., 0} }
809	–	}
810	–	};
811	–
812	–	static int nabases = 3; /* current number of defined bases */
813	–
814	–	#define FEQ(a,b) ((a)-(b) <= 1e-6 && (b)-(a) <= 1e-6)
815	–
816	–	static int
817	–	fequal(double a, double b)
818	–	{
819	–	if (b != .0)
820	–	a = a/b - 1.;
821	–	return((a <= 1e-6) & (a >= -1e-6));
822	–	}
823	–
824	–	/* Returns the name of the given tag */
825	–	#ifdef ezxml_name
826	–	#undef ezxml_name
827	–	static char *
828	–	ezxml_name(ezxml_t xml)
829	–	{
830	–	if (xml == NULL)
831	–	return(NULL);
832	–	return(xml->name);
833	–	}
834	–	#endif
835	–
836	–	/* Returns the given tag's character content or empty string if none */
837	–	#ifdef ezxml_txt
838	–	#undef ezxml_txt
839	–	static char *
840	–	ezxml_txt(ezxml_t xml)
841	–	{
842	–	if (xml == NULL)
843	–	return("");
844	–	return(xml->txt);
845	–	}
846	–	#endif
847	–
848	–
849	–	static int
850	–	ab_getvec( /* get vector for this angle basis index */
851	–	FVECT v,
852	–	int ndx,
853	–	void *p
854	–	)
855	–	{
856	–	ANGLE_BASIS ab = (ANGLE_BASIS )p;
857	–	int li;
858	–	double pol, azi, d;
859	–
860	–	if ((ndx < 0) \| (ndx >= ab->nangles))
861	–	return(0);
862	–	for (li = 0; ndx >= ab->lat[li].nphis; li++)
863	–	ndx -= ab->lat[li].nphis;
864	–	pol = PI/180.0.5(ab->lat[li].tmin + ab->lat[li+1].tmin);
865	–	azi = 2.PIndx/ab->lat[li].nphis;
866	–	v[2] = d = cos(pol);
867	–	d = sqrt(1. - dd); / sin(pol) */
868	–	v[0] = cos(azi)*d;
869	–	v[1] = sin(azi)*d;
870	–	return(1);
871	–	}
872	–
873	–
874	–	static int
875	–	ab_getndx( /* get index corresponding to the given vector */
876	–	FVECT v,
877	–	void *p
878	–	)
879	–	{
880	–	ANGLE_BASIS ab = (ANGLE_BASIS )p;
881	–	int li, ndx;
882	–	double pol, azi, d;
883	–
884	–	if ((v[2] < -1.0) \| (v[2] > 1.0))
885	–	return(-1);
886	–	pol = 180.0/PI*acos(v[2]);
887	–	azi = 180.0/PI*atan2(v[1], v[0]);
888	–	if (azi < 0.0) azi += 360.0;
889	–	for (li = 1; ab->lat[li].tmin <= pol; li++)
890	–	if (!ab->lat[li].nphis)
891	–	return(-1);
892	–	--li;
893	–	ndx = (int)((1./360.)aziab->lat[li].nphis + 0.5);
894	–	if (ndx >= ab->lat[li].nphis) ndx = 0;
895	–	while (li--)
896	–	ndx += ab->lat[li].nphis;
897	–	return(ndx);
898	–	}
899	–
900	–
901	–	static double
902	–	ab_getohm( /* get solid angle for this angle basis index */
903	–	int ndx,
904	–	void *p
905	–	)
906	–	{
907	–	ANGLE_BASIS ab = (ANGLE_BASIS )p;
908	–	int li;
909	–	double theta, theta1;
910	–
911	–	if ((ndx < 0) \| (ndx >= ab->nangles))
912	–	return(0);
913	–	for (li = 0; ndx >= ab->lat[li].nphis; li++)
914	–	ndx -= ab->lat[li].nphis;
915	–	theta1 = PI/180. * ab->lat[li+1].tmin;
916	–	if (ab->lat[li].nphis == 1) { /* special case */
917	–	if (ab->lat[li].tmin > FTINY)
918	–	error(USER, "unsupported BSDF coordinate system");
919	–	return(2.PI(1. - cos(theta1)));
920	–	}
921	–	theta = PI/180. * ab->lat[li].tmin;
922	–	return(2.PI(cos(theta) - cos(theta1))/(double)ab->lat[li].nphis);
923	–	}
924	–
925	–
926	–	static int
927	–	ab_getvecR( /* get reverse vector for this angle basis index */
928	–	FVECT v,
929	–	int ndx,
930	–	void *p
931	–	)
932	–	{
933	–	if (!ab_getvec(v, ndx, p))
934	–	return(0);
935	–
936	–	v[0] = -v[0];
937	–	v[1] = -v[1];
938	–	v[2] = -v[2];
939	–
940	–	return(1);
941	–	}
942	–
943	–
944	–	static int
945	–	ab_getndxR( /* get index corresponding to the reverse vector */
946	–	FVECT v,
947	–	void *p
948	–	)
949	–	{
950	–	FVECT v2;
951	–
952	–	v2[0] = -v[0];
953	–	v2[1] = -v[1];
954	–	v2[2] = -v[2];
955	–
956	–	return ab_getndx(v2, p);
957	–	}
958	–
959	–
960	–	static void
961	–	load_angle_basis( /* load custom BSDF angle basis */
962	–	ezxml_t wab
963	–	)
964	–	{
965	–	char *abname = ezxml_txt(ezxml_child(wab, "AngleBasisName"));
966	–	ezxml_t wbb;
967	–	int i;
968	–
969	–	if (!abname \|\| !*abname)
970	–	return;
971	–	for (i = nabases; i--; )
972	–	if (!strcasecmp(abname, abase_list[i].name))
973	–	return; /* assume it's the same */
974	–	if (nabases >= MAXABASES)
975	–	error(INTERNAL, "too many angle bases");
976	–	strcpy(abase_list[nabases].name, abname);
977	–	abase_list[nabases].nangles = 0;
978	–	for (i = 0, wbb = ezxml_child(wab, "AngleBasisBlock");
979	–	wbb != NULL; i++, wbb = wbb->next) {
980	–	if (i >= MAXLATS)
981	–	error(INTERNAL, "too many latitudes in custom basis");
982	–	abase_list[nabases].lat[i+1].tmin = atof(ezxml_txt(
983	–	ezxml_child(ezxml_child(wbb,
984	–	"ThetaBounds"), "UpperTheta")));
985	–	if (!i)
986	–	abase_list[nabases].lat[i].tmin =
987	–	-abase_list[nabases].lat[i+1].tmin;
988	–	else if (!fequal(atof(ezxml_txt(ezxml_child(ezxml_child(wbb,
989	–	"ThetaBounds"), "LowerTheta"))),
990	–	abase_list[nabases].lat[i].tmin))
991	–	error(WARNING, "theta values disagree in custom basis");
992	–	abase_list[nabases].nangles +=
993	–	abase_list[nabases].lat[i].nphis =
994	–	atoi(ezxml_txt(ezxml_child(wbb, "nPhis")));
995	–	}
996	–	abase_list[nabases++].lat[i].nphis = 0;
997	–	}
998	–
999	–
1000	–	static void
1001	–	load_geometry( /* load geometric dimensions and description (if any) */
1002	–	struct BSDF_data *dp,
1003	–	ezxml_t wdb
1004	–	)
1005	–	{
1006	–	ezxml_t geom;
1007	–	double cfact;
1008	–	const char fmt, mgfstr;
1009	–
1010	–	dp->dim[0] = dp->dim[1] = dp->dim[2] = 0;
1011	–	dp->mgf = NULL;
1012	–	if ((geom = ezxml_child(wdb, "Width")) != NULL)
1013	–	dp->dim[0] = atof(ezxml_txt(geom)) *
1014	–	to_meters(ezxml_attr(geom, "unit"));
1015	–	if ((geom = ezxml_child(wdb, "Height")) != NULL)
1016	–	dp->dim[1] = atof(ezxml_txt(geom)) *
1017	–	to_meters(ezxml_attr(geom, "unit"));
1018	–	if ((geom = ezxml_child(wdb, "Thickness")) != NULL)
1019	–	dp->dim[2] = atof(ezxml_txt(geom)) *
1020	–	to_meters(ezxml_attr(geom, "unit"));
1021	–	if ((geom = ezxml_child(wdb, "Geometry")) == NULL \|\|
1022	–	(mgfstr = ezxml_txt(geom)) == NULL)
1023	–	return;
1024	–	if ((fmt = ezxml_attr(geom, "format")) != NULL &&
1025	–	strcasecmp(fmt, "MGF")) {
1026	–	sprintf(errmsg, "unrecognized geometry format '%s'", fmt);
1027	–	error(WARNING, errmsg);
1028	–	return;
1029	–	}
1030	–	cfact = to_meters(ezxml_attr(geom, "unit"));
1031	–	dp->mgf = (char *)malloc(strlen(mgfstr)+32);
1032	–	if (dp->mgf == NULL)
1033	–	error(SYSTEM, "out of memory in load_geometry");
1034	–	if (cfact < 0.99 \|\| cfact > 1.01)
1035	–	sprintf(dp->mgf, "xf -s %.5f\n%s\nxf\n", cfact, mgfstr);
1036	–	else
1037	–	strcpy(dp->mgf, mgfstr);
1038	–	}
1039	–
1040	–
1041	–	static void
1042	–	load_bsdf_data( /* load BSDF distribution for this wavelength */
1043	–	struct BSDF_data *dp,
1044	–	ezxml_t wdb
1045	–	)
1046	–	{
1047	–	char *cbasis = ezxml_txt(ezxml_child(wdb,"ColumnAngleBasis"));
1048	–	char *rbasis = ezxml_txt(ezxml_child(wdb,"RowAngleBasis"));
1049	–	char *sdata;
1050	–	int i;
1051	–
1052	–	if ((!cbasis \|\| !cbasis) \| (!rbasis \|\| !rbasis)) {
1053	–	error(WARNING, "missing column/row basis for BSDF");
1054	–	return;
1055	–	}
1056	–	for (i = nabases; i--; )
1057	–	if (!strcasecmp(cbasis, abase_list[i].name)) {
1058	–	dp->ninc = abase_list[i].nangles;
1059	–	dp->ib_priv = (void *)&abase_list[i];
1060	–	dp->ib_vec = ab_getvecR;
1061	–	dp->ib_ndx = ab_getndxR;
1062	–	dp->ib_ohm = ab_getohm;
1063	–	break;
1064	–	}
1065	–	if (i < 0) {
1066	–	sprintf(errmsg, "undefined ColumnAngleBasis '%s'", cbasis);
1067	–	error(WARNING, errmsg);
1068	–	return;
1069	–	}
1070	–	for (i = nabases; i--; )
1071	–	if (!strcasecmp(rbasis, abase_list[i].name)) {
1072	–	dp->nout = abase_list[i].nangles;
1073	–	dp->ob_priv = (void *)&abase_list[i];
1074	–	dp->ob_vec = ab_getvec;
1075	–	dp->ob_ndx = ab_getndx;
1076	–	dp->ob_ohm = ab_getohm;
1077	–	break;
1078	–	}
1079	–	if (i < 0) {
1080	–	sprintf(errmsg, "undefined RowAngleBasis '%s'", cbasis);
1081	–	error(WARNING, errmsg);
1082	–	return;
1083	–	}
1084	–	/* read BSDF data */
1085	–	sdata = ezxml_txt(ezxml_child(wdb,"ScatteringData"));
1086	–	if (!sdata \|\| !*sdata) {
1087	–	error(WARNING, "missing BSDF ScatteringData");
1088	–	return;
1089	–	}
1090	–	dp->bsdf = (float )malloc(sizeof(float)dp->ninc*dp->nout);
1091	–	if (dp->bsdf == NULL)
1092	–	error(SYSTEM, "out of memory in load_bsdf_data");
1093	–	for (i = 0; i < dp->ninc*dp->nout; i++) {
1094	–	char *sdnext = fskip(sdata);
1095	–	if (sdnext == NULL) {
1096	–	error(WARNING, "bad/missing BSDF ScatteringData");
1097	–	free(dp->bsdf); dp->bsdf = NULL;
1098	–	return;
1099	–	}
1100	–	while (sdnext && isspace(sdnext))
1101	–	sdnext++;
1102	–	if (*sdnext == ',') sdnext++;
1103	–	dp->bsdf[i] = atof(sdata);
1104	–	sdata = sdnext;
1105	–	}
1106	–	while (isspace(*sdata))
1107	–	sdata++;
1108	–	if (*sdata) {
1109	–	sprintf(errmsg, "%d extra characters after BSDF ScatteringData",
1110	–	(int)strlen(sdata));
1111	–	error(WARNING, errmsg);
1112	–	}
1113	–	}
1114	–
1115	–
1116	–	static int
1117	–	check_bsdf_data( /* check that BSDF data is sane */
1118	–	struct BSDF_data *dp
1119	–	)
1120	–	{
1121	–	double omega_iarr, omega_oarr;
1122	–	double dom, contrib, hemi_total, full_total;
1123	–	int nneg;
1124	–	FVECT v;
1125	–	int i, o;
1126	–
1127	–	if (dp == NULL \|\| dp->bsdf == NULL)
1128	–	return(0);
1129	–	omega_iarr = (double *)calloc(dp->ninc, sizeof(double));
1130	–	omega_oarr = (double *)calloc(dp->nout, sizeof(double));
1131	–	if ((omega_iarr == NULL) \| (omega_oarr == NULL))
1132	–	error(SYSTEM, "out of memory in check_bsdf_data");
1133	–	/* incoming projected solid angles */
1134	–	hemi_total = .0;
1135	–	for (i = dp->ninc; i--; ) {
1136	–	dom = getBSDF_incohm(dp,i);
1137	–	if (dom <= .0) {
1138	–	error(WARNING, "zero/negative incoming solid angle");
1139	–	continue;
1140	–	}
1141	–	if (!getBSDF_incvec(v,dp,i) \|\| v[2] > FTINY) {
1142	–	error(WARNING, "illegal incoming BSDF direction");
1143	–	free(omega_iarr); free(omega_oarr);
1144	–	return(0);
1145	–	}
1146	–	hemi_total += omega_iarr[i] = dom * -v[2];
1147	–	}
1148	–	if ((hemi_total > 1.02PI) \| (hemi_total < 0.98PI)) {
1149	–	sprintf(errmsg, "incoming BSDF hemisphere off by %.1f%%",
1150	–	100.*(hemi_total/PI - 1.));
1151	–	error(WARNING, errmsg);
1152	–	}
1153	–	dom = PI / hemi_total; /* fix normalization */
1154	–	for (i = dp->ninc; i--; )
1155	–	omega_iarr[i] *= dom;
1156	–	/* outgoing projected solid angles */
1157	–	hemi_total = .0;
1158	–	for (o = dp->nout; o--; ) {
1159	–	dom = getBSDF_outohm(dp,o);
1160	–	if (dom <= .0) {
1161	–	error(WARNING, "zero/negative outgoing solid angle");
1162	–	continue;
1163	–	}
1164	–	if (!getBSDF_outvec(v,dp,o) \|\| v[2] < -FTINY) {
1165	–	error(WARNING, "illegal outgoing BSDF direction");
1166	–	free(omega_iarr); free(omega_oarr);
1167	–	return(0);
1168	–	}
1169	–	hemi_total += omega_oarr[o] = dom * v[2];
1170	–	}
1171	–	if ((hemi_total > 1.02PI) \| (hemi_total < 0.98PI)) {
1172	–	sprintf(errmsg, "outgoing BSDF hemisphere off by %.1f%%",
1173	–	100.*(hemi_total/PI - 1.));
1174	–	error(WARNING, errmsg);
1175	–	}
1176	–	dom = PI / hemi_total; /* fix normalization */
1177	–	for (o = dp->nout; o--; )
1178	–	omega_oarr[o] *= dom;
1179	–	nneg = 0; /* check outgoing totals */
1180	–	for (i = 0; i < dp->ninc; i++) {
1181	–	hemi_total = .0;
1182	–	for (o = dp->nout; o--; ) {
1183	–	double f = BSDF_value(dp,i,o);
1184	–	if (f >= .0)
1185	–	hemi_total += f*omega_oarr[o];
1186	–	else {
1187	–	nneg += (f < -FTINY);
1188	–	BSDF_value(dp,i,o) = .0f;
1189	–	}
1190	–	}
1191	–	if (hemi_total > 1.01) {
1192	–	sprintf(errmsg,
1193	–	"incoming BSDF direction %d passes %.1f%% of light",
1194	–	i, 100.*hemi_total);
1195	–	error(WARNING, errmsg);
1196	–	}
1197	–	}
1198	–	if (nneg) {
1199	–	sprintf(errmsg, "%d negative BSDF values (ignored)", nneg);
1200	–	error(WARNING, errmsg);
1201	–	}
1202	–	full_total = .0; /* reverse roles and check again */
1203	–	for (o = 0; o < dp->nout; o++) {
1204	–	hemi_total = .0;
1205	–	for (i = dp->ninc; i--; )
1206	–	hemi_total += BSDF_value(dp,i,o) * omega_iarr[i];
1207	–
1208	–	if (hemi_total > 1.01) {
1209	–	sprintf(errmsg,
1210	–	"outgoing BSDF direction %d collects %.1f%% of light",
1211	–	o, 100.*hemi_total);
1212	–	error(WARNING, errmsg);
1213	–	}
1214	–	full_total += hemi_total*omega_oarr[o];
1215	–	}
1216	–	full_total /= PI;
1217	–	if (full_total > 1.00001) {
1218	–	sprintf(errmsg, "BSDF transfers %.4f%% of light",
1219	–	100.*full_total);
1220	–	error(WARNING, errmsg);
1221	–	}
1222	–	free(omega_iarr); free(omega_oarr);
1223	–	return(1);
1224	–	}
1225	–
1226	–
1227	–	struct BSDF_data *
1228	–	load_BSDF( /* load BSDF data from file */
1229	–	char *fname
1230	–	)
1231	–	{
1232	–	char *path;
1233	–	ezxml_t fl, wtl, wld, wdb;
1234	–	struct BSDF_data *dp;
1235	–
1236	–	path = getpath(fname, getrlibpath(), R_OK);
1237	–	if (path == NULL) {
1238	–	sprintf(errmsg, "cannot find BSDF file \"%s\"", fname);
1239	–	error(WARNING, errmsg);
1240	–	return(NULL);
1241	–	}
1242	–	fl = ezxml_parse_file(path);
1243	–	if (fl == NULL) {
1244	–	sprintf(errmsg, "cannot open BSDF \"%s\"", path);
1245	–	error(WARNING, errmsg);
1246	–	return(NULL);
1247	–	}
1248	–	if (ezxml_error(fl)[0]) {
1249	–	sprintf(errmsg, "BSDF \"%s\" %s", path, ezxml_error(fl));
1250	–	error(WARNING, errmsg);
1251	–	ezxml_free(fl);
1252	–	return(NULL);
1253	–	}
1254	–	if (strcmp(ezxml_name(fl), "WindowElement")) {
1255	–	sprintf(errmsg,
1256	–	"BSDF \"%s\": top level node not 'WindowElement'",
1257	–	path);
1258	–	error(WARNING, errmsg);
1259	–	ezxml_free(fl);
1260	–	return(NULL);
1261	–	}
1262	–	wtl = ezxml_child(ezxml_child(fl, "Optical"), "Layer");
1263	–	if (strcasecmp(ezxml_txt(ezxml_child(ezxml_child(wtl,
1264	–	"DataDefinition"), "IncidentDataStructure")),
1265	–	"Columns")) {
1266	–	sprintf(errmsg,
1267	–	"BSDF \"%s\": unsupported IncidentDataStructure",
1268	–	path);
1269	–	error(WARNING, errmsg);
1270	–	ezxml_free(fl);
1271	–	return(NULL);
1272	–	}
1273	–	load_angle_basis(ezxml_child(ezxml_child(wtl,
1274	–	"DataDefinition"), "AngleBasis"));
1275	–	dp = (struct BSDF_data *)calloc(1, sizeof(struct BSDF_data));
1276	–	load_geometry(dp, ezxml_child(wtl, "Material"));
1277	–	for (wld = ezxml_child(wtl, "WavelengthData");
1278	–	wld != NULL; wld = wld->next) {
1279	–	if (strcasecmp(ezxml_txt(ezxml_child(wld,"Wavelength")),
1280	–	"Visible"))
1281	–	continue;
1282	–	for (wdb = ezxml_child(wld, "WavelengthDataBlock");
1283	–	wdb != NULL; wdb = wdb->next)
1284	–	if (!strcasecmp(ezxml_txt(ezxml_child(wdb,
1285	–	"WavelengthDataDirection")),
1286	–	"Transmission Front"))
1287	–	break;
1288	–	if (wdb != NULL) { /* load front BTDF */
1289	–	load_bsdf_data(dp, wdb);
1290	–	break; /* ignore the rest */
1291	–	}
1292	–	}
1293	–	ezxml_free(fl); /* done with XML file */
1294	–	if (!check_bsdf_data(dp)) {
1295	–	sprintf(errmsg, "bad/missing BTDF data in \"%s\"", path);
1296	–	error(WARNING, errmsg);
1297	–	free_BSDF(dp);
1298	–	dp = NULL;
1299	–	}
1300	–	return(dp);
1301	–	}
1302	–
1303	–
1304	–	void
1305	–	free_BSDF( /* free BSDF data structure */
1306	–	struct BSDF_data *b
1307	–	)
1308	–	{
1309	–	if (b == NULL)
1310	–	return;
1311	–	if (b->mgf != NULL)
1312	–	free(b->mgf);
1313	–	if (b->bsdf != NULL)
1314	–	free(b->bsdf);
1315	–	free(b);
1316	–	}
1317	–
1318	–
1319	–	int
1320	–	r_BSDF_incvec( /* compute random input vector at given location */
1321	–	FVECT v,
1322	–	struct BSDF_data *b,
1323	–	int i,
1324	–	double rv,
1325	–	MAT4 xm
1326	–	)
1327	–	{
1328	–	FVECT pert;
1329	–	double rad;
1330	–	int j;
1331	–
1332	–	if (!getBSDF_incvec(v, b, i))
1333	–	return(0);
1334	–	rad = sqrt(getBSDF_incohm(b, i) / PI);
1335	–	multisamp(pert, 3, rv);
1336	–	for (j = 0; j < 3; j++)
1337	–	v[j] += rad(2.pert[j] - 1.);
1338	–	if (xm != NULL)
1339	–	multv3(v, v, xm);
1340	–	return(normalize(v) != 0.0);
1341	–	}
1342	–
1343	–
1344	–	int
1345	–	r_BSDF_outvec( /* compute random output vector at given location */
1346	–	FVECT v,
1347	–	struct BSDF_data *b,
1348	–	int o,
1349	–	double rv,
1350	–	MAT4 xm
1351	–	)
1352	–	{
1353	–	FVECT pert;
1354	–	double rad;
1355	–	int j;
1356	–
1357	–	if (!getBSDF_outvec(v, b, o))
1358	–	return(0);
1359	–	rad = sqrt(getBSDF_outohm(b, o) / PI);
1360	–	multisamp(pert, 3, rv);
1361	–	for (j = 0; j < 3; j++)
1362	–	v[j] += rad(2.pert[j] - 1.);
1363	–	if (xm != NULL)
1364	–	multv3(v, v, xm);
1365	–	return(normalize(v) != 0.0);
1366	–	}
1367	–
1368	–
1369	–	static int
1370	–	addrot( /* compute rotation (x,y,z) => (xp,yp,zp) */
1371	–	char *xfarg[],
1372	–	FVECT xp,
1373	–	FVECT yp,
1374	–	FVECT zp
1375	–	)
1376	–	{
1377	–	static char bufs[3][16];
1378	–	int bn = 0;
1379	–	char **xfp = xfarg;
1380	–	double theta;
1381	–
1382	–	if (yp[2]yp[2] + zp[2]zp[2] < 2.FTINYFTINY) {
1383	–	/* Special case for X' along Z-axis */
1384	–	theta = -atan2(yp[0], yp[1]);
1385	–	*xfp++ = "-ry";
1386	–	*xfp++ = xp[2] < 0.0 ? "90" : "-90";
1387	–	*xfp++ = "-rz";
1388	–	sprintf(bufs[bn], "%f", theta*(180./PI));
1389	–	*xfp++ = bufs[bn++];
1390	–	return(xfp - xfarg);
1391	–	}
1392	–	theta = atan2(yp[2], zp[2]);
1393	–	if (!FEQ(theta,0.0)) {
1394	–	*xfp++ = "-rx";
1395	–	sprintf(bufs[bn], "%f", theta*(180./PI));
1396	–	*xfp++ = bufs[bn++];
1397	–	}
1398	–	theta = asin(-xp[2]);
1399	–	if (!FEQ(theta,0.0)) {
1400	–	*xfp++ = "-ry";
1401	–	sprintf(bufs[bn], " %f", theta*(180./PI));
1402	–	*xfp++ = bufs[bn++];
1403	–	}
1404	–	theta = atan2(xp[1], xp[0]);
1405	–	if (!FEQ(theta,0.0)) {
1406	–	*xfp++ = "-rz";
1407	–	sprintf(bufs[bn], "%f", theta*(180./PI));
1408	–	*xfp++ = bufs[bn++];
1409	–	}
1410	–	*xfp = NULL;
1411	–	return(xfp - xfarg);
1412	–	}
1413	–
1414	–
1415	–	int
1416	–	getBSDF_xfm( /* compute BSDF orient. -> world orient. transform */
1417	–	MAT4 xm,
1418	–	FVECT nrm,
1419	–	UpDir ud,
1420	–	char *xfbuf
1421	–	)
1422	–	{
1423	–	char *xfargs[7];
1424	–	XF myxf;
1425	–	FVECT updir, xdest, ydest;
1426	–	int i;
1427	–
1428	–	updir[0] = updir[1] = updir[2] = 0.;
1429	–	switch (ud) {
1430	–	case UDzneg:
1431	–	updir[2] = -1.;
1432	–	break;
1433	–	case UDyneg:
1434	–	updir[1] = -1.;
1435	–	break;
1436	–	case UDxneg:
1437	–	updir[0] = -1.;
1438	–	break;
1439	–	case UDxpos:
1440	–	updir[0] = 1.;
1441	–	break;
1442	–	case UDypos:
1443	–	updir[1] = 1.;
1444	–	break;
1445	–	case UDzpos:
1446	–	updir[2] = 1.;
1447	–	break;
1448	–	case UDunknown:
1449	–	return(0);
1450	–	}
1451	–	fcross(xdest, updir, nrm);
1452	–	if (normalize(xdest) == 0.0)
1453	–	return(0);
1454	–	fcross(ydest, nrm, xdest);
1455	–	xf(&myxf, addrot(xfargs, xdest, ydest, nrm), xfargs);
1456	–	copymat4(xm, myxf.xfm);
1457	–	if (xfbuf == NULL)
1458	–	return(1);
1459	–	/* return xf arguments as well */
1460	–	for (i = 0; xfargs[i] != NULL; i++) {
1461	–	*xfbuf++ = ' ';
1462	–	strcpy(xfbuf, xfargs[i]);
1463	–	while (*xfbuf) ++xfbuf;
1464	–	}
1465	–	return(1);
1466	–	}
1467	–
1468	–	/######### END DEPRECATED ROUTINES #######/
1469	–	/################################################################/

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Comparing ray/src/common/bsdf.c (file contents): Revision 2.15 by greg, Fri Feb 18 00:40:25 2011 UTC vs. Revision 2.48 by greg, Mon Mar 24 04:00:45 2014 UTC

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Comparing ray/src/common/bsdf.c (file contents):
Revision 2.15 by greg, Fri Feb 18 00:40:25 2011 UTC vs.
Revision 2.48 by greg, Mon Mar 24 04:00:45 2014 UTC