[ViewVC] Diff of: radiance/ray/src/rt/pmapmat.c

Comparing ray/src/rt/pmapmat.c (file contents):
Revision 2.5 by greg, Thu May 21 05:54:54 2015 UTC vs.
Revision 2.21 by rschregle, Thu Dec 6 20:00:35 2018 UTC

#	Line 1 \| Line 1
1	+	#ifndef lint
2	+	static const char RCSid[] = "$Id$";
3	+	#endif
4		/*
5		==================================================================
6		Photon map support routines for scattering by materials.
#	Line 8 \| Line 11
11		supported by the Swiss National Science Foundation (SNSF, #147053)
12		==================================================================
13
11	–	$Id$
14		*/
15
16
#	Line 32 \| Line 34
34		#define SP_FLAT 010
35		#define SP_BADU 040
36		#define MLAMBDA 500
37	<	#define RINDEX 1.52
37	>	#define RINDEX 1.52
38		#define FRESNE(ci) (exp(-5.85*(ci)) - 0.00287989916)
39
40
#	Line 44 \| Line 46 \| typedef struct {
46		COLOR mcolor, scolor;
47		FVECT vrefl, prdir, pnorm;
48		double alpha2, rdiff, rspec, trans, tdiff, tspec, pdot;
49	<	} NORMDAT;
49	>	} NORMDAT;
50
51		typedef struct {
52		OBJREC *mp;
#	Line 53 \| Line 55 \| typedef struct {
55		COLOR mcolor, scolor;
56		FVECT vrefl, prdir, u, v, pnorm;
57		double u_alpha, v_alpha, rdiff, rspec, trans, tdiff, tspec, pdot;
58	<	} ANISODAT;
58	>	} ANISODAT;
59
60		typedef struct {
61		OBJREC *mp;
62	<	RAY *pr;
63	<	FVECT pnorm;
64	<	FVECT vray;
65	<	double sr_vpsa [2];
66	<	RREAL toloc [3][3];
67	<	RREAL fromloc [3][3];
68	<	double thick;
62	>	RAY *pr;
63	>	DATARRAY *dp;
64	>	COLOR mcolor;
65	>	COLOR rdiff;
66	>	COLOR tdiff;
67	>	double rspec;
68	>	double trans;
69	>	double tspec;
70	>	FVECT pnorm;
71	>	double pdot;
72	>	} BRDFDAT;
73	>
74	>	typedef struct {
75	>	OBJREC *mp;
76	>	RAY *pr;
77	>	FVECT pnorm;
78	>	FVECT vray;
79	>	double sr_vpsa [2];
80	>	RREAL toloc [3][3];
81	>	RREAL fromloc [3][3];
82	>	double thick;
83		SDData *sd;
84		COLOR runsamp;
85		COLOR rdiff;
#	Line 104 \| Line 120 \| *void photonRay (const RAY rayIn, RAY rayOut,*
120		{
121		rayorigin(rayOut, rayOutType, rayIn, NULL);
122
123	<	/* Transfer flux */
124	<	copycolor(rayOut -> rcol, rayIn -> rcol);
125	<
126	<	/* Copy caustic flag & direction for transferred rays */
127	<	if (rayOutType == PMAP_XFER) {
128	<	/* rayOut -> rtype \|= rayIn -> rtype & SPECULAR; */
129	<	rayOut -> rtype \|= rayIn -> rtype;
130	<	VCOPY(rayOut -> rdir, rayIn -> rdir);
131	<	}
132	<	else if (fluxAtten) {
133	<	/* Attenuate and normalise flux for scattered rays */
134	<	multcolor(rayOut -> rcol, fluxAtten);
135	<	colorNorm(rayOut -> rcol);
136	<	}
123	>	if (rayIn) {
124	>	/* Transfer flux */
125	>	copycolor(rayOut -> rcol, rayIn -> rcol);
126	>
127	>	/* Copy caustic flag & direction for transferred rays */
128	>	if (rayOutType == PMAP_XFER) {
129	>	/* rayOut -> rtype \|= rayIn -> rtype & SPECULAR; */
130	>	rayOut -> rtype \|= rayIn -> rtype;
131	>	VCOPY(rayOut -> rdir, rayIn -> rdir);
132	>	}
133	>	else if (fluxAtten) {
134	>	/* Attenuate and normalise flux for scattered rays */
135	>	multcolor(rayOut -> rcol, fluxAtten);
136	>	colorNorm(rayOut -> rcol);
137	>	}
138
139	<	/* Propagate index of emitting light source */
140	<	rayOut -> rsrc = rayIn -> rsrc;
139	>	/* Propagate index of emitting light source */
140	>	rayOut -> rsrc = rayIn -> rsrc;
141	>
142	>	/* Update maximum photon path distance */
143	>	rayOut -> rmax = rayIn -> rmax - rayIn -> rot;
144	>	}
145		}
146
147
#	Line 130 \| Line 151 \| *static void addPhotons (const RAY r)**
151		{
152		if (!r -> rlvl)
153		/* Add direct photon map at primary hitpoint */
154	<	addPhoton(directPmap, r);
154	>	newPhoton(directPmap, r);
155		else {
156		/* Add global or precomputed photon map at indirect hitpoint */
157	<	addPhoton(preCompPmap ? preCompPmap : globalPmap, r);
157	>	newPhoton(preCompPmap ? preCompPmap : globalPmap, r);
158
159		/* Store caustic photon if specular flag set */
160		if (PMAP_CAUSTICRAY(r))
161	<	addPhoton(causticPmap, r);
161	>	newPhoton(causticPmap, r);
162
163		/* Store in contribution photon map */
164	<	addPhoton(contribPmap, r);
164	>	newPhoton(contribPmap, r);
165		}
166		}
167
#	Line 199 \| Line 220 \| *static int isoSpecPhotonScatter (NORMDAT nd, RAY ray*
220		int niter, i = 0;
221
222		/* Set up sample coordinates */
223	<	getperpendicular(u, nd -> pnorm, 1);
223	>	getperpendicular(u, nd -> pnorm, 1);
224		fcross(v, nd -> pnorm, u);
225
226		if (nd -> specfl & SP_REFL) {
#	Line 233 \| Line 254 \| *static int isoSpecPhotonScatter (NORMDAT nd, RAY ray*
254		cosp = cos(d);
255		sinp = sin(d);
256		d2 = pmapRandom(scatterState);
257	<	d = d2 <= FTINY ? 1 : sqrt(-log(d2) * nd -> alpha2);
257	>	d = d2 <= FTINY ? 1 : sqrt(-log(d2) * nd -> alpha2);
258
259		for (i = 0; i < 3; i++)
260		rayOut -> rdir [i] = nd -> prdir [i] +
#	Line 254 \| Line 275 \| *static int isoSpecPhotonScatter (NORMDAT nd, RAY ray*
275		static void diffPhotonScatter (FVECT normal, RAY* rayOut)
276		/* Generate cosine-weighted direction for diffuse ray */
277		{
278	<	const RREAL cosThetaSqr = pmapRandom(scatterState),
278	>	const RREAL cosThetaSqr = pmapRandom(scatterState),
279		cosTheta = sqrt(cosThetaSqr),
280	<	sinTheta = sqrt(1 - cosThetaSqr),
281	<	phi = 2 * PI * pmapRandom(scatterState),
280	>	sinTheta = sqrt(1 - cosThetaSqr),
281	>	phi = 2 * PI * pmapRandom(scatterState),
282		du = cos(phi) * sinTheta, dv = sin(phi) * sinTheta;
283		FVECT u, v;
284		int i = 0;
#	Line 298 \| Line 319 \| *static int normalPhotonScatter (OBJREC mat, RAY rayI*
319		}
320		else raytexture(rayIn, mat -> omod);
321
322	+	nd.mp = mat;
323		nd.rp = rayIn;
324
325		/* Get material color */
#	Line 414 \| Line 436 \| *static int normalPhotonScatter (OBJREC mat, RAY rayI*
436
437		if (hastexture) {
438		/* Perturb */
439	<	for (i = 0; i < 3; i++)
439	>	for (i = 0; i < 3; i++)
440		nd.prdir [i] = rayIn -> rdir [i] - rayIn -> pert [i];
441
442	<	if (DOT(nd.prdir, rayIn -> ron) < -FTINY)
442	>	if (DOT(nd.prdir, rayIn -> ron) < -FTINY)
443		normalize(nd.prdir);
444		else VCOPY(nd.prdir, rayIn -> rdir);
445		}
446		else VCOPY(nd.prdir, rayIn -> rdir);
447
448		if ((nd.specfl & (SP_TRAN \| SP_PURE)) == (SP_TRAN \| SP_PURE))
449	<	/* Perfect specular transmission */
449	>	/* Perfect specular transmission */
450		VCOPY(rayOut.rdir, nd.prdir);
451	<	else if (!isoSpecPhotonScatter(&nd, &rayOut))
451	>	else if (!isoSpecPhotonScatter(&nd, &rayOut))
452		return 0;
453
454	<	photonRay(rayIn, &rayOut, PMAP_SPECTRANS, nd.mcolor);
454	>	photonRay(rayIn, &rayOut, PMAP_SPECTRANS, nd.mcolor);
455		}
456
457		else if (xi > (albedo -= prdiff)) {
#	Line 459 \| Line 481 \| *static int normalPhotonScatter (OBJREC mat, RAY rayI*
481
482
483
484	<	static void getacoords (ANISODAT *np)
484	>	static void getacoords (ANISODAT *nd)
485		/* Set up coordinate system for anisotropic sampling; cloned from aniso.c */
486		{
487	<	MFUNC *mf;
488	<	int i;
487	>	MFUNC *mf;
488	>	int i;
489
490	<	mf = getfunc(np->mp, 3, 0x7, 1);
491	<	setfunc(np->mp, np->rp);
492	<	errno = 0;
493	<
494	<	for (i = 0; i < 3; i++)
495	<	np->u[i] = evalue(mf->ep[i]);
474	<
475	<	if ((errno == EDOM) \| (errno == ERANGE)) {
476	<	objerror(np->mp, WARNING, "compute error");
477	<	np->specfl \|= SP_BADU;
478	<	return;
479	<	}
490	>	mf = getfunc(nd -> mp, 3, 0x7, 1);
491	>	setfunc(nd -> mp, nd -> rp);
492	>	errno = 0;
493	>
494	>	for (i = 0; i < 3; i++)
495	>	nd -> u [i] = evalue(mf -> ep [i]);
496
497	<	if (mf->fxp != &unitxf)
498	<	multv3(np->u, np->u, mf->fxp->xfm);
497	>	if (errno == EDOM \|\| errno == ERANGE)
498	>	nd -> u [0] = nd -> u [1] = nd -> u [2] = 0.0;
499
500	<	fcross(np->v, np->pnorm, np->u);
501	<
502	<	if (normalize(np->v) == 0.0) {
503	<	objerror(np->mp, WARNING, "illegal orientation vector");
488	<	np->specfl \|= SP_BADU;
489	<	return;
490	<	}
500	>	if (mf -> fxp != &unitxf)
501	>	multv3(nd -> u, nd -> u, mf -> fxp -> xfm);
502	>
503	>	fcross(nd -> v, nd -> pnorm, nd -> u);
504
505	<	fcross(np->u, np->v, np->pnorm);
505	>	if (normalize(nd -> v) == 0.0) {
506	>	if (fabs(nd -> u_alpha - nd -> v_alpha) > 0.001)
507	>	objerror(nd -> mp, WARNING, "illegal orientation vector");
508	>	getperpendicular(nd -> u, nd -> pnorm, 1);
509	>	fcross(nd -> v, nd -> pnorm, nd -> u);
510	>	nd -> u_alpha = nd -> v_alpha =
511	>	sqrt(0.5 * (sqr(nd -> u_alpha) + sqr(nd -> v_alpha)));
512	>	}
513	>	else fcross(nd -> u, nd -> v, nd -> pnorm);
514		}
515
516
#	Line 512 \| Line 533 \| static int anisoSpecPhotonScatter (ANISODAT nd, RAY
533		if (rayOut -> rtype & TRANS) {
534		/* Specular transmission */
535
536	<	if (DOT(rayIn -> pert, rayIn -> pert) <= FTINY * FTINY)
536	>	if (DOT(rayIn -> pert, rayIn -> pert) <= sqr(FTINY))
537		VCOPY(nd -> prdir, rayIn -> rdir);
538		else {
539		/* perturb */
#	Line 548 \| Line 569 \| static int anisoSpecPhotonScatter (ANISODAT nd, RAY
569		}
570		}
571
572	<	return 0;
572	>	return 0;
573		}
574
575		else {
#	Line 566 \| Line 587 \| static int anisoSpecPhotonScatter (ANISODAT nd, RAY
587		d = d2 <= FTINY ? 1
588		: sqrt(-log(d2) /
589		(sqr(cosp) / sqr(nd -> u_alpha) +
590	<	sqr(sinp) / (nd -> v_alpha * nd -> v_alpha)));
590	>	sqr(sinp) / (nd->v_alpha * nd->v_alpha)));
591
592		for (i = 0; i < 3; i++)
593		h [i] = nd -> pnorm [i] +
#	Line 595 \| Line 616 \| *static int anisoPhotonScatter (OBJREC mat, RAY rayIn*
616		if (mat -> oargs.nfargs != (mat -> otype == MAT_TRANS2 ? 8 : 6))
617		objerror(mat, USER, "bad number of real arguments");
618
619	+	nd.mp = mat;
620		nd.rp = rayIn;
599	–	nd.mp = objptr(rayIn -> ro -> omod);
621
622		/* get material color */
623		copycolor(nd.mcolor, mat -> oargs.farg);
#	Line 640 \| Line 661 \| *static int anisoPhotonScatter (OBJREC mat, RAY rayIn*
661		if (nd.rspec > FTINY) {
662		nd.specfl \|= SP_REFL;
663
664	<	/* comput e specular color */
664	>	/* compute specular color */
665		if (mat -> otype == MAT_METAL2)
666		copycolor(nd.scolor, nd.mcolor);
667		else setcolor(nd.scolor, 1, 1, 1);
#	Line 743 \| Line 764 \| static int dielectricPhotonScatter (OBJREC mat, RAY
764		/* get modifiers */
765		raytexture(rayIn, mat -> omod);
766
767	<	if ((hastexture = (DOT(rayIn -> pert, rayIn -> pert) > FTINY * FTINY)))
767	>	if ((hastexture = (DOT(rayIn -> pert, rayIn -> pert) > sqr(FTINY))))
768		/* Perturb normal */
769		cos1 = raynormal(dnorm, rayIn);
770		else {
#	Line 753 \| Line 774 \| static int dielectricPhotonScatter (OBJREC mat, RAY
774
775		/* index of refraction */
776		nratio = mat -> otype ==
777	<	MAT_DIELECTRIC ? mat -> oargs.farg [3] + mat -> oargs.farg [4] / MLAMBDA
778	<	: mat -> oargs.farg [3] / mat -> oargs.farg [7];
777	>	MAT_DIELECTRIC ? mat->oargs.farg[3] + mat->oargs.farg[4] / MLAMBDA
778	>	: mat->oargs.farg[3] / mat->oargs.farg[7];
779
780		if (cos1 < 0) {
781		/* inside */
#	Line 831 \| Line 852 \| static int dielectricPhotonScatter (OBJREC mat, RAY
852		for (i = 0; i < 3; i++)
853		rayOut.rdir [i] = nratio * rayIn -> rdir [i] + d1 * dnorm [i];
854
855	<	if (hastexture && DOT(rayOut.rdir, rayIn -> ron) * hastexture >= -FTINY) {
855	>	if (hastexture && DOT(rayOut.rdir, rayIn->ron)*hastexture >= -FTINY) {
856		d1 *= hastexture;
857
858		for (i = 0; i < 3; i++)
#	Line 850 \| Line 871 \| static int dielectricPhotonScatter (OBJREC mat, RAY
871		photonRay(rayIn, &rayOut, PMAP_SPECREFL, NULL);
872		VSUM(rayOut.rdir, rayIn -> rdir, dnorm, 2 * cos1);
873
874	<	if (hastexture && DOT(rayOut.rdir, rayIn -> ron) * hastexture <= FTINY)
874	>	if (hastexture && DOT(rayOut.rdir, rayIn->ron) * hastexture <= FTINY)
875		for (i = 0; i < 3; i++)
876		rayOut.rdir [i] = rayIn -> rdir [i] +
877		2 * rayIn -> rod * rayIn -> ron [i];
#	Line 890 \| Line 911 \| *static int glassPhotonScatter (OBJREC mat, RAY rayIn*
911		/* reorient if necessary */
912		if (rayIn -> rod < 0)
913		flipsurface(rayIn);
914	<	if ((hastexture = (DOT(rayIn -> pert, rayIn -> pert) > FTINY * FTINY) ))
914	>	if ((hastexture = (DOT(rayIn -> pert, rayIn -> pert) > sqr(FTINY))))
915		pdot = raynormal(pnorm, rayIn);
916		else {
917		VCOPY(pnorm, rayIn -> ron);
#	Line 972 \| Line 993 \| *static int aliasPhotonScatter (OBJREC mat, RAY rayIn*
993		/* Transfer photon scattering to alias target */
994		{
995		OBJECT aliasObj;
996	<	OBJREC aliasRec;
996	>	OBJREC aliasRec, *aliasPtr;
997
998		/* Straight replacement? */
999		if (!mat -> oargs.nsargs) {
1000	<	mat = objptr(mat -> omod);
1001	<	photonScatter [mat -> otype] (mat, rayIn);
1000	>	/* Skip void modifier! */
1001	>	if (mat -> omod != OVOID) {
1002	>	mat = objptr(mat -> omod);
1003	>	photonScatter [mat -> otype] (mat, rayIn);
1004	>	}
1005
1006		return 0;
1007		}
#	Line 986 \| Line 1010 \| *static int aliasPhotonScatter (OBJREC mat, RAY rayIn*
1010		if (mat -> oargs.nsargs != 1)
1011		objerror(mat, INTERNAL, "bad # string arguments");
1012
1013	<	aliasObj = lastmod(objndx(mat), mat -> oargs.sarg [0]);
1014	<
991	<	if (aliasObj < 0)
992	<	objerror(mat, USER, "bad reference");
993	<
994	<	memcpy(&aliasRec, objptr(aliasObj), sizeof(OBJREC));
1013	>	aliasPtr = mat;
1014	>	aliasObj = objndx(aliasPtr);
1015
1016	+	/* Follow alias trail */
1017	+	do {
1018	+	aliasObj = aliasPtr -> oargs.nsargs == 1
1019	+	? lastmod(aliasObj, aliasPtr -> oargs.sarg [0])
1020	+	: aliasPtr -> omod;
1021	+	if (aliasObj < 0)
1022	+	objerror(aliasPtr, USER, "bad reference");
1023	+
1024	+	aliasPtr = objptr(aliasObj);
1025	+	} while (aliasPtr -> otype == MOD_ALIAS);
1026	+
1027	+	/* Copy alias object */
1028	+	aliasRec = *aliasPtr;
1029	+
1030		/* Substitute modifier */
1031		aliasRec.omod = mat -> omod;
1032
1033		/* Replacement scattering routine */
1034		photonScatter [aliasRec.otype] (&aliasRec, rayIn);
1035	+
1036	+	/* Avoid potential memory leak? */
1037	+	if (aliasRec.os != aliasPtr -> os) {
1038	+	if (aliasPtr -> os)
1039	+	free_os(aliasPtr);
1040	+	aliasPtr -> os = aliasRec.os;
1041	+	}
1042	+
1043		return 0;
1044		}
1045
#	Line 1026 \| Line 1068 \| *static int clipPhotonScatter (OBJREC mat, RAY rayIn)*
1068		continue;
1069
1070		if ((mod = lastmod(obj, mat -> oargs.sarg [i])) == OVOID) {
1071	<	sprintf(errmsg, "unknown modifier \"%s\"", mat -> oargs.sarg [i]);
1071	>	sprintf(errmsg, "unknown modifier \"%s\"", mat->oargs.sarg[i]);
1072		objerror(mat, WARNING, errmsg);
1073		continue;
1074		}
#	Line 1222 \| Line 1264 \| *static int mx_dataPhotonScatter (OBJREC mat, RAY ray*
1264		if (!strcmp(mat -> oargs.sarg [i], VOIDID))
1265		mod [i] = OVOID;
1266		else if ((mod [i] = lastmod(obj, mat -> oargs.sarg [i])) == OVOID) {
1267	<	sprintf(errmsg, "undefined modifier \"%s\"", mat -> oargs.sarg [i]);
1267	>	sprintf(errmsg, "undefined modifier \"%s\"", mat->oargs.sarg[i]);
1268		objerror(mat, USER, errmsg);
1269		}
1270
#	Line 1248 \| Line 1290 \| *static int mx_dataPhotonScatter (OBJREC mat, RAY ray*
1290		if (errno)
1291		objerror(mat, WARNING, "compute error");
1292		else {
1293	<	mat = objptr(mod [pmapRandom(rouletteState) < coef ? 0 : 1]);
1294	<	photonScatter [mat -> otype] (mat, rayIn);
1293	>	OBJECT mxMod = mod [pmapRandom(rouletteState) < coef ? 0 : 1];
1294	>
1295	>	if (mxMod != OVOID) {
1296	>	mat = objptr(mxMod);
1297	>	photonScatter [mat -> otype] (mat, rayIn);
1298	>	}
1299	>	else {
1300	>	/* Transfer ray if no modifier */
1301	>	RAY rayOut;
1302	>
1303	>	photonRay(rayIn, &rayOut, PMAP_XFER, NULL);
1304	>	tracePhoton(&rayOut);
1305	>	}
1306		}
1307
1308		return 0;
#	Line 1276 \| Line 1329 \| *static int mx_pdataPhotonScatter (OBJREC mat, RAY ra*
1329		if (!strcmp(mat -> oargs.sarg [i], VOIDID))
1330		mod [i] = OVOID;
1331		else if ((mod [i] = lastmod(obj, mat -> oargs.sarg [i])) == OVOID) {
1332	<	sprintf(errmsg, "undefined modifier \"%s\"", mat -> oargs.sarg [i]);
1332	>	sprintf(errmsg, "undefined modifier \"%s\"", mat->oargs.sarg[i]);
1333		objerror(mat, USER, errmsg);
1334		}
1335
#	Line 1301 \| Line 1354 \| *static int mx_pdataPhotonScatter (OBJREC mat, RAY ra*
1354		if (errno)
1355		objerror(mat, WARNING, "compute error");
1356		else {
1357	<	mat = objptr(mod [pmapRandom(rouletteState) < coef ? 0 : 1]);
1358	<	photonScatter [mat -> otype] (mat, rayIn);
1357	>	OBJECT mxMod = mod [pmapRandom(rouletteState) < coef ? 0 : 1];
1358	>
1359	>	if (mxMod != OVOID) {
1360	>	mat = objptr(mxMod);
1361	>	photonScatter [mat -> otype] (mat, rayIn);
1362	>	}
1363	>	else {
1364	>	/* Transfer ray if no modifier */
1365	>	RAY rayOut;
1366	>
1367	>	photonRay(rayIn, &rayOut, PMAP_XFER, NULL);
1368	>	tracePhoton(&rayOut);
1369	>	}
1370		}
1371
1372		return 0;
#	Line 1327 \| Line 1391 \| *static int mx_funcPhotonScatter (OBJREC mat, RAY ray*
1391		if (!strcmp(mat -> oargs.sarg [i], VOIDID))
1392		mod [i] = OVOID;
1393		else if ((mod [i] = lastmod(obj, mat -> oargs.sarg [i])) == OVOID) {
1394	<	sprintf(errmsg, "undefined modifier \"%s\"", mat -> oargs.sarg [i]);
1394	>	sprintf(errmsg, "undefined modifier \"%s\"", mat->oargs.sarg[i]);
1395		objerror(mat, USER, errmsg);
1396		}
1397
#	Line 1341 \| Line 1405 \| *static int mx_funcPhotonScatter (OBJREC mat, RAY ray*
1405		if (errno)
1406		objerror(mat, WARNING, "compute error");
1407		else {
1408	<	mat = objptr(mod [pmapRandom(rouletteState) < coef ? 0 : 1]);
1409	<	photonScatter [mat -> otype] (mat, rayIn);
1408	>	OBJECT mxMod = mod [pmapRandom(rouletteState) < coef ? 0 : 1];
1409	>
1410	>	if (mxMod != OVOID) {
1411	>	mat = objptr(mxMod);
1412	>	photonScatter [mat -> otype] (mat, rayIn);
1413	>	}
1414	>	else {
1415	>	/* Transfer ray if no modifier */
1416	>	RAY rayOut;
1417	>
1418	>	photonRay(rayIn, &rayOut, PMAP_XFER, NULL);
1419	>	tracePhoton(&rayOut);
1420	>	}
1421		}
1422
1423		return 0;
#	Line 1374 \| Line 1449 \| *static int pattexPhotonScatter (OBJREC mat, RAY rayI*
1449
1450
1451
1452	<	#if 0
1453	<	static int bsdfPhotonScatter (OBJREC mat, RAY rayIn)
1454	<	/* Generate new photon ray for BSDF modifier and recurse. */
1455	<	{
1456	<	int hitFront;
1457	<	SDError err;
1458	<	FVECT upvec;
1384	<	MFUNC *mf;
1385	<	BSDFDAT nd;
1386	<	RAY rayOut;
1452	>	static int setbrdfunc(BRDFDAT *bd)
1453	>	/* Set up brdf function and variables; ripped off from m_brdf.c */
1454	>	{
1455	>	FVECT v;
1456	>
1457	>	if (setfunc(bd -> mp, bd -> pr) == 0)
1458	>	return 0;
1459
1460	<	/* Following code adapted from m_bsdf() */
1461	<	/* Check arguments */
1462	<	if (mat -> oargs.nsargs < 6 \|\| mat -> oargs.nfargs > 9 \|\|
1463	<	mat -> oargs.nfargs % 3)
1464	<	objerror(mat, USER, "bad # arguments");
1465	<
1466	<	hitFront = (rayIn -> rod > 0);
1460	>	/* (Re)Assign func variables */
1461	>	multv3(v, bd -> pnorm, funcxf.xfm);
1462	>	varset("NxP", '=', v [0] / funcxf.sca);
1463	>	varset("NyP", '=', v [1] / funcxf.sca);
1464	>	varset("NzP", '=', v [2] / funcxf.sca);
1465	>	varset("RdotP", '=',
1466	>	bd -> pdot <= -1. ? -1. : bd -> pdot >= 1. ? 1. : bd -> pdot);
1467	>	varset("CrP", '=', colval(bd -> mcolor, RED));
1468	>	varset("CgP", '=', colval(bd -> mcolor, GRN));
1469	>	varset("CbP", '=', colval(bd -> mcolor, BLU));
1470	>
1471	>	return 1;
1472	>	}
1473
1396	–	/* Load cal file */
1397	–	mf = getfunc(mat, 5, 0x1d, 1);
1398	–
1399	–	/* Get thickness */
1400	–	nd.thick = evalue(mf -> ep [0]);
1401	–	if ((-FTINY <= nd.thick) & (nd.thick <= FTINY))
1402	–	nd.thick = .0;
1403	–
1404	–	if (nd.thick != .0 \|\| (!hitFront && !backvis)) {
1405	–	/* Proxy geometry present, so use it instead and transfer ray */
1406	–	photonRay(rayIn, &rayOut, PMAP_XFER, NULL);
1407	–	tracePhoton(&rayOut);
1408	–
1409	–	return 0;
1410	–	}
1474
1412	–	/* Get BSDF data */
1413	–	nd.sd = loadBSDF(mat -> oargs.sarg [1]);
1414	–
1415	–	/* Diffuse reflectance */
1416	–	if (hitFront) {
1417	–	if (mat -> oargs.nfargs < 3)
1418	–	setcolor(nd.rdiff, .0, .0, .0);
1419	–	else setcolor(nd.rdiff, mat -> oargs.farg [0], mat -> oargs.farg [1],
1420	–	mat -> oargs.farg [2]);
1421	–	}
1422	–	else if (mat -> oargs.nfargs < 6) {
1423	–	/* Check for absorbing backside */
1424	–	if (!backvis && !nd.sd -> rb && !nd.sd -> tf) {
1425	–	SDfreeCache(nd.sd);
1426	–	return 0;
1427	–	}
1428	–
1429	–	setcolor(nd.rdiff, .0, .0, .0);
1430	–	}
1431	–	else setcolor(nd.rdiff, mat -> oargs.farg [3], mat -> oargs.farg [4],
1432	–	mat -> oargs.farg [5]);
1475
1476	<	/* Diffuse transmittance */
1477	<	if (mat -> oargs.nfargs < 9)
1478	<	setcolor(nd.tdiff, .0, .0, .0);
1479	<	else setcolor(nd.tdiff, mat -> oargs.farg [6], mat -> oargs.farg [7],
1480	<	mat -> oargs.farg [8]);
1481	<
1482	<	nd.mp = mat;
1483	<	nd.pr = rayIn;
1476	>	static int brdfPhotonScatter (OBJREC mat, RAY rayIn)
1477	>	/* Generate new photon ray for BRTDfunc material and recurse. Only ideal
1478	>	reflection and transmission are sampled for the specular componentent. */
1479	>	{
1480	>	int hitfront = 1, hastexture, i;
1481	>	BRDFDAT nd;
1482	>	RAY rayOut;
1483	>	COLOR rspecCol, tspecCol;
1484	>	double prDiff, ptDiff, prSpec, ptSpec, albedo, xi;
1485	>	MFUNC *mf;
1486	>	FVECT bnorm;
1487	>
1488	>	/* Check argz */
1489	>	if (mat -> oargs.nsargs < 10 \|\| mat -> oargs.nfargs < 9)
1490	>	objerror(mat, USER, "bad # arguments");
1491
1492	<	/* Get modifiers */
1493	<	raytexture(rayIn, mat -> omod);
1494	<
1495	<	/* Modify diffuse values */
1496	<	multcolor(nd.rdiff, rayIn -> pcol);
1497	<	multcolor(nd.tdiff, rayIn -> pcol);
1498	<
1499	<	/* Get up vector & xform to world coords */
1500	<	upvec [0] = evalue(mf -> ep [1]);
1501	<	upvec [1] = evalue(mf -> ep [2]);
1502	<	upvec [2] = evalue(mf -> ep [3]);
1503	<
1504	<	if (mf -> fxp != &unitxf) {
1505	<	multv3(upvec, upvec, mf -> fxp -> xfm);
1506	<	nd.thick *= mf -> fxp -> sca;
1492	>	nd.mp = mat;
1493	>	nd.pr = rayIn;
1494	>	/* Dummiez */
1495	>	nd.rspec = nd.tspec = 1.0;
1496	>	nd.trans = 0.5;
1497	>
1498	>	/* Diffuz reflektanz */
1499	>	if (rayIn -> rod > 0.0)
1500	>	setcolor(nd.rdiff, mat -> oargs.farg[0], mat -> oargs.farg [1],
1501	>	mat -> oargs.farg [2]);
1502	>	else
1503	>	setcolor(nd.rdiff, mat-> oargs.farg [3], mat -> oargs.farg [4],
1504	>	mat -> oargs.farg [5]);
1505	>	/* Diffuz tranzmittanz */
1506	>	setcolor(nd.tdiff, mat -> oargs.farg [6], mat -> oargs.farg [7],
1507	>	mat -> oargs.farg [8]);
1508	>
1509	>	/* Get modz */
1510	>	raytexture(rayIn, mat -> omod);
1511	>	hastexture = (DOT(rayIn -> pert, rayIn -> pert) > sqr(FTINY));
1512	>	if (hastexture) {
1513	>	/* Perturb normal */
1514	>	nd.pdot = raynormal(nd.pnorm, rayIn);
1515	>	}
1516	>	else {
1517	>	VCOPY(nd.pnorm, rayIn -> ron);
1518	>	nd.pdot = rayIn -> rod;
1519	>	}
1520	>
1521	>	if (rayIn -> rod < 0.0) {
1522	>	/* Orient perturbed valuz */
1523	>	nd.pdot = -nd.pdot;
1524	>	for (i = 0; i < 3; i++) {
1525	>	nd.pnorm [i] = -nd.pnorm [i];
1526	>	rayIn -> pert [i] = -rayIn -> pert [i];
1527		}
1528
1529	<	if (rayIn -> rox) {
1530	<	multv3(upvec, upvec, rayIn -> rox -> f.xfm);
1531	<	nd.thick *= rayIn -> rox -> f.sca;
1529	>	hitfront = 0;
1530	>	}
1531	>
1532	>	/* Get pattern kolour, modify diffuz valuz */
1533	>	copycolor(nd.mcolor, rayIn -> pcol);
1534	>	multcolor(nd.rdiff, nd.mcolor);
1535	>	multcolor(nd.tdiff, nd.mcolor);
1536	>
1537	>	/* Load cal file, evaluate spekula refl/tranz varz */
1538	>	nd.dp = NULL;
1539	>	mf = getfunc(mat, 9, 0x3f, 0);
1540	>	setbrdfunc(&nd);
1541	>	errno = 0;
1542	>	setcolor(rspecCol,
1543	>	evalue(mf->ep[0]), evalue(mf->ep[1]), evalue(mf->ep[2]));
1544	>	setcolor(tspecCol,
1545	>	evalue(mf->ep[3]), evalue(mf->ep[4]), evalue(mf->ep[5]));
1546	>	if (errno == EDOM \|\| errno == ERANGE)
1547	>	objerror(mat, WARNING, "compute error");
1548	>	else {
1549	>	/* Set up probz */
1550	>	prDiff = colorAvg(nd.rdiff);
1551	>	ptDiff = colorAvg(nd.tdiff);
1552	>	prSpec = colorAvg(rspecCol);
1553	>	ptSpec = colorAvg(tspecCol);
1554	>	albedo = prDiff + ptDiff + prSpec + ptSpec;
1555	>	}
1556	>
1557	>	/* Insert direct and indirect photon hitz if diffuz komponent */
1558	>	if (prDiff > FTINY \|\| ptDiff > FTINY)
1559	>	addPhotons(rayIn);
1560	>
1561	>	/* Stochastically sample absorption or scattering evenz */
1562	>	if ((xi = pmapRandom(rouletteState)) > albedo)
1563	>	/* Absorbed */
1564	>	return 0;
1565	>
1566	>	if (xi > (albedo -= prSpec)) {
1567	>	/* Ideal spekula reflekzion */
1568	>	photonRay(rayIn, &rayOut, PMAP_SPECREFL, rspecCol);
1569	>	VSUM(rayOut.rdir, rayIn -> rdir, nd.pnorm, 2 * nd.pdot);
1570	>	checknorm(rayOut.rdir);
1571	>	}
1572	>	else if (xi > (albedo -= ptSpec)) {
1573	>	/* Ideal spekula tranzmission */
1574	>	photonRay(rayIn, &rayOut, PMAP_SPECTRANS, tspecCol);
1575	>	if (hastexture) {
1576	>	/* Perturb direkzion */
1577	>	VSUB(rayOut.rdir, rayIn -> rdir, rayIn -> pert);
1578	>	if (normalize(rayOut.rdir) == 0.0) {
1579	>	objerror(mat, WARNING, "illegal perturbation");
1580	>	VCOPY(rayOut.rdir, rayIn -> rdir);
1581	>	}
1582	>	else VCOPY(rayOut.rdir, rayIn -> rdir);
1583		}
1584	+	}
1585	+	else if (xi > (albedo -= prDiff)) {
1586	+	/* Diffuz reflekzion */
1587	+	if (!hitfront)
1588	+	flipsurface(rayIn);
1589	+	photonRay(rayIn, &rayOut, PMAP_DIFFREFL, nd.mcolor);
1590	+	diffPhotonScatter(nd.pnorm, &rayOut);
1591	+	}
1592	+	else {
1593	+	/* Diffuz tranzmission */
1594	+	if (hitfront)
1595	+	flipsurface(rayIn);
1596	+	photonRay(rayIn, &rayOut, PMAP_DIFFTRANS, nd.mcolor);
1597	+	bnorm [0] = -nd.pnorm [0];
1598	+	bnorm [1] = -nd.pnorm [1];
1599	+	bnorm [2] = -nd.pnorm [2];
1600	+	diffPhotonScatter(bnorm, &rayOut);
1601	+	}
1602	+
1603	+	tracePhoton(&rayOut);
1604	+	return 0;
1605	+	}
1606	+
1607	+
1608	+
1609	+	int brdf2PhotonScatter (OBJREC mat, RAY rayIn)
1610	+	/* Generate new photon ray for procedural or data driven BRDF material and
1611	+	recurse. Only diffuse reflection and transmission are sampled. */
1612	+	{
1613	+	BRDFDAT nd;
1614	+	RAY rayOut;
1615	+	double dtmp, prDiff, ptDiff, albedo, xi;
1616	+	MFUNC *mf;
1617	+	FVECT bnorm;
1618	+
1619	+	/* Check argz */
1620	+	if (mat -> oargs.nsargs < (hasdata(mat -> otype) ? 4 : 2) \|\|
1621	+	mat -> oargs.nfargs < (mat -> otype == MAT_TFUNC \|\|
1622	+	mat -> otype == MAT_TDATA ? 6 : 4))
1623	+	objerror(mat, USER, "bad # arguments");
1624
1625	<	/* Perturb normal */
1626	<	raynormal(nd.pnorm, rayIn);
1627	<
1628	<	/* Xform incident dir to local BSDF coords */
1629	<	err = SDcompXform(nd.toloc, nd.pnorm, upvec);
1470	<
1471	<	if (!err) {
1472	<	nd.vray [0] = -rayIn -> rdir [0];
1473	<	nd.vray [1] = -rayIn -> rdir [1];
1474	<	nd.vray [2] = -rayIn -> rdir [2];
1475	<	err = SDmapDir(nd.vray, nd.toloc, nd.vray);
1476	<	}
1477	<
1478	<	if (!err)
1479	<	err = SDinvXform(nd.fromloc, nd.toloc);
1480	<
1481	<	if (err) {
1482	<	objerror(mat, WARNING, "Illegal orientation vector");
1625	>	if (rayIn -> rod < 0.0) {
1626	>	/* Hit backside; reorient if visible, else transfer photon */
1627	>	if (!backvis) {
1628	>	photonRay(rayIn, &rayOut, PMAP_XFER, NULL);
1629	>	tracePhoton(&rayOut);
1630		return 0;
1631		}
1632
1633	<	/* Determine BSDF resolution */
1634	<	err = SDsizeBSDF(nd.sr_vpsa, nd.vray, NULL, SDqueryMin + SDqueryMax, nd.sd);
1635	<
1636	<	if (err)
1490	<	objerror(mat, USER, transSDError(err));
1491	<
1492	<	nd.sr_vpsa [0] = sqrt(nd.sr_vpsa [0]);
1493	<	nd.sr_vpsa [1] = sqrt(nd.sr_vpsa [1]);
1633	>	raytexture(rayIn, mat -> omod);
1634	>	flipsurface(rayIn);
1635	>	}
1636	>	else raytexture(rayIn, mat -> omod);
1637
1638	<	/* Orient perturbed normal towards incident side */
1639	<	if (!hitFront) {
1640	<	nd.pnorm [0] = -nd.pnorm [0];
1641	<	nd.pnorm [1] = -nd.pnorm [1];
1642	<	nd.pnorm [2] = -nd.pnorm [2];
1643	<	}
1644	<
1645	<	/* Following code adapted from SDsampBSDF() */
1646	<	{
1647	<	SDSpectralDF rdf, tdf;
1648	<	SDValue bsdfVal;
1649	<	double xi, rhoDiff = 0;
1650	<	float coef [SDmaxCh];
1651	<	int i, j, n, nr;
1652	<	SDComponent *sdc;
1653	<	const SDCDst **cdarr = NULL;
1654	<
1655	<	/* Get diffuse albedo (?) */
1656	<	if (hitFront) {
1657	<	bsdfVal = nd.sd -> rLambFront;
1658	<	rdf = nd.sd -> rf;
1659	<	tdf = nd.sd -> tf ? nd.sd -> tf : nd.sd -> tb;
1660	<	}
1661	<	else {
1662	<	bsdfVal = nd.sd -> rLambBack;
1663	<	rdf = nd.sd -> rb;
1664	<	tdf = nd.sd -> tb ? nd.sd -> tb : nd.sd -> tf;
1665	<	}
1666	<
1667	<	rhoDiff = bsdfVal.cieY;
1668	<	bsdfVal.cieY += nd.sd -> tLamb.cieY;
1669	<
1670	<	/* Allocate non-diffuse sampling */
1671	<	i = nr = rdf ? rdf -> ncomp : 0;
1672	<	j = tdf ? tdf -> ncomp : 0;
1673	<	n = i + j;
1674	<
1675	<	if (n > 0 && !(cdarr = (const SDCDst*)malloc(n sizeof(SDCDst*))))
1676	<	objerror(mat, USER, transSDError(SDEmemory));
1677	<
1535	<	while (j-- > 0) {
1536	<	/* Sum up non-diffuse transmittance */
1537	<	cdarr [i + j] = (*tdf -> comp [j].func -> getCDist)(nd.vray, &tdf -> comp [j]);
1538	<
1539	<	if (!cdarr [i + j])
1540	<	cdarr [i + j] = &SDemptyCD;
1541	<	else bsdfVal.cieY += cdarr [i + j] -> cTotal;
1542	<	}
1543	<
1544	<	while (i-- > 0) {
1545	<	/* Sum up non-diffuse reflectance */
1546	<	cdarr [i] = (*rdf -> comp [i].func -> getCDist)(nd.vray, &rdf -> comp [i]);
1547	<
1548	<	if (!cdarr [i])
1549	<	cdarr [i] = &SDemptyCD;
1550	<	else bsdfVal.cieY += cdarr [i] -> cTotal;
1551	<	}
1552	<
1553	<	if (bsdfVal.cieY <= FTINY) {
1554	<	/* Don't bother sampling, just absorb photon */
1555	<	if (cdarr)
1556	<	free(cdarr);
1557	<	return 0;
1558	<	}
1559	<
1560	<	/* Insert direct and indirect photon hits if diffuse component */
1561	<	if (rhoDiff > FTINY \|\| nd.sd -> tLamb.cieY > FTINY)
1562	<	addPhotons(rayIn);
1563	<
1564	<	xi = pmapRandom(rouletteState);
1565	<
1566	<	if ((xi -= rhoDiff) <= 0) {
1567	<	/* Diffuse reflection */
1568	<	photonRay(rayIn, &rayOut, PMAP_DIFFREFL, nd.rdiff);
1569	<	diffPhotonScatter(nd.pnorm, &rayOut);
1570	<	}
1571	<	else if ((xi -= nd.sd -> tLamb.cieY) <= 0) {
1572	<	/* Diffuse transmission */
1573	<	flipsurface(rayIn);
1574	<	photonRay(rayIn, &rayOut, PMAP_DIFFTRANS, nd.tdiff);
1575	<	bsdfVal.spec = nd.sd -> tLamb.spec;
1576	<	diffPhotonScatter(nd.pnorm, &rayOut);
1577	<	}
1578	<	else {
1579	<	int rayOutType;
1580	<	COLOR bsdfRGB;
1581	<
1582	<	/* Non-diffuse CDF inversion (?) */
1583	<	for (i = 0; i < n && (xi -= cdarr [i] -> cTotal) > 0; i++);
1584	<
1585	<	if (i >= n) {
1586	<	/* Absorbed -- photon went Deer Hunter */
1587	<	if (cdarr)
1588	<	free(cdarr);
1589	<	return 0;
1590	<	}
1638	>	nd.mp = mat;
1639	>	nd.pr = rayIn;
1640	>
1641	>	/* Material kolour */
1642	>	setcolor(nd.mcolor, mat -> oargs.farg [0], mat -> oargs.farg [1],
1643	>	mat -> oargs.farg [2]);
1644	>	/* Spekula komponent */
1645	>	nd.rspec = mat -> oargs.farg [3];
1646	>
1647	>	/* Tranzmittanz */
1648	>	if (mat -> otype == MAT_TFUNC \|\| mat -> otype == MAT_TDATA) {
1649	>	nd.trans = mat -> oargs.farg [4] * (1.0 - nd.rspec);
1650	>	nd.tspec = nd.trans * mat -> oargs.farg [5];
1651	>	dtmp = nd.trans - nd.tspec;
1652	>	setcolor(nd.tdiff, dtmp, dtmp, dtmp);
1653	>	}
1654	>	else {
1655	>	nd.tspec = nd.trans = 0.0;
1656	>	setcolor(nd.tdiff, 0.0, 0.0, 0.0);
1657	>	}
1658	>
1659	>	/* Reflektanz */
1660	>	dtmp = 1.0 - nd.trans - nd.rspec;
1661	>	setcolor(nd.rdiff, dtmp, dtmp, dtmp);
1662	>	/* Perturb normal */
1663	>	nd.pdot = raynormal(nd.pnorm, rayIn);
1664	>	/* Modify material kolour */
1665	>	multcolor(nd.mcolor, rayIn -> pcol);
1666	>	multcolor(nd.rdiff, nd.mcolor);
1667	>	multcolor(nd.tdiff, nd.mcolor);
1668	>
1669	>	/* Load auxiliary filez */
1670	>	if (hasdata(mat -> otype)) {
1671	>	nd.dp = getdata(mat -> oargs.sarg [1]);
1672	>	getfunc(mat, 2, 0, 0);
1673	>	}
1674	>	else {
1675	>	nd.dp = NULL;
1676	>	getfunc(mat, 1, 0, 0);
1677	>	}
1678
1679	<	if (i < nr) {
1680	<	/* Non-diffuse reflection */
1681	<	sdc = &rdf -> comp [i];
1682	<	rayOutType = PMAP_SPECREFL;
1596	<	}
1597	<	else {
1598	<	/* Non-diffuse transmission */
1599	<	sdc = &tdf -> comp [i - nr];
1600	<	rayOutType = PMAP_SPECTRANS;
1601	<	}
1602	<
1603	<	/* Generate non-diff sample dir */
1604	<	VCOPY(rayOut.rdir, nd.vray);
1605	<	err = (*sdc -> func -> sampCDist)
1606	<	(rayOut.rdir, pmapRandom(scatterState), cdarr [i]);
1607	<	if (err)
1608	<	objerror(mat, USER, transSDError(SDEinternal));
1679	>	/* Set up probz */
1680	>	prDiff = colorAvg(nd.rdiff);
1681	>	ptDiff = colorAvg(nd.tdiff);
1682	>	albedo = prDiff + ptDiff;
1683
1684	<	/* Get colour */
1685	<	j = (*sdc -> func -> getBSDFs)(coef, rayOut.rdir, nd.vray, sdc);
1686	<
1613	<	if (j <= 0) {
1614	<	sprintf(SDerrorDetail, "BSDF \"%s\" sampling value error",
1615	<	nd.sd -> name);
1616	<	objerror(mat, USER, transSDError(SDEinternal));
1617	<	}
1618	<
1619	<	bsdfVal.spec = sdc -> cspec [0];
1620	<	rhoDiff = coef [0];
1621	<
1622	<	while (--j) {
1623	<	c_cmix(&bsdfVal.spec, rhoDiff, &bsdfVal.spec, coef [j],
1624	<	&sdc -> cspec [j]);
1625	<	rhoDiff += coef [j];
1626	<	}
1627	<
1628	<	/* ? */
1629	<	c_ccvt(&bsdfVal.spec, C_CSXY + C_CSSPEC);
1630	<	ccy2rgb(&bsdfVal.spec, bsdfVal.cieY, bsdfRGB);
1631	<
1632	<	/* Xform outgoing dir to world coords */
1633	<	if ((err = SDmapDir(rayOut.rdir, nd.fromloc, rayOut.rdir))) {
1634	<	objerror(mat, USER, transSDError(err));
1635	<	return 0;
1636	<	}
1637	<
1638	<	photonRay(rayIn, &rayOut, rayOutType, bsdfRGB);
1639	<	}
1640	<
1641	<	if (cdarr)
1642	<	free(cdarr);
1643	<	}
1644	<
1645	<	/* Clean up BSDF */
1646	<	SDfreeCache(nd.sd);
1684	>	/* Insert direct and indirect photon hitz if diffuz komponent */
1685	>	if (prDiff > FTINY \|\| ptDiff > FTINY)
1686	>	addPhotons(rayIn);
1687
1688	<	tracePhoton(&rayOut);
1688	>	/* Stochastically sample absorption or scattering evenz */
1689	>	if ((xi = pmapRandom(rouletteState)) > albedo)
1690	>	/* Absorbed */
1691		return 0;
1692	+
1693	+	if (xi > (albedo -= prDiff)) {
1694	+	/* Diffuz reflekzion */
1695	+	photonRay(rayIn, &rayOut, PMAP_DIFFREFL, nd.rdiff);
1696	+	diffPhotonScatter(nd.pnorm, &rayOut);
1697		}
1698	<	#else
1698	>	else {
1699	>	/* Diffuz tranzmission */
1700	>	flipsurface(rayIn);
1701	>	photonRay(rayIn, &rayOut, PMAP_DIFFTRANS, nd.tdiff);
1702	>	bnorm [0] = -nd.pnorm [0];
1703	>	bnorm [1] = -nd.pnorm [1];
1704	>	bnorm [2] = -nd.pnorm [2];
1705	>	diffPhotonScatter(bnorm, &rayOut);
1706	>	}
1707
1708	+	tracePhoton(&rayOut);
1709	+	return 0;
1710	+	}
1711	+
1712	+
1713	+
1714		/*
1715	+	==================================================================
1716		The following code is
1717		(c) Lucerne University of Applied Sciences and Arts,
1718		supported by the Swiss National Science Foundation (SNSF, #147053)
1719	<	*/
1719	>	==================================================================
1720	>	*/
1721
1722		static int bsdfPhotonScatter (OBJREC mat, RAY rayIn)
1723		/* Generate new photon ray for BSDF modifier and recurse. */
1724		{
1725	+	int hasthick = (mat->otype == MAT_BSDF);
1726		int hitFront;
1727		SDError err;
1728		SDValue bsdfVal;
#	Line 1667 \| Line 1731 \| *static int bsdfPhotonScatter (OBJREC mat, RAY rayIn)*
1731		BSDFDAT nd;
1732		RAY rayOut;
1733		COLOR bsdfRGB;
1734	+	int transmitted;
1735		double prDiff, ptDiff, prDiffSD, ptDiffSD, prSpecSD, ptSpecSD,
1736	<	albedo, xi, xi2;
1737	<	const double patAlb = colorAvg(rayIn -> pcol);
1736	>	albedo, xi;
1737	>	const double patAlb = bright(rayIn -> pcol);
1738
1739		/* Following code adapted from m_bsdf() */
1740		/* Check arguments */
1741	<	if (mat -> oargs.nsargs < 6 \|\| mat -> oargs.nfargs > 9 \|\|
1741	>	if (mat -> oargs.nsargs < hasthick+5 \|\| mat -> oargs.nfargs > 9 \|\|
1742		mat -> oargs.nfargs % 3)
1743		objerror(mat, USER, "bad # arguments");
1744
1745	<	hitFront = (rayIn -> rod > 0);
1745	>	hitFront = (rayIn -> rod > 0);
1746
1747	<	/* Load cal file */
1748	<	mf = getfunc(mat, 5, 0x1d, 1);
1749	<
1750	<	/* Get thickness */
1751	<	nd.thick = evalue(mf -> ep [0]);
1752	<	if ((-FTINY <= nd.thick) & (nd.thick <= FTINY))
1753	<	nd.thick = .0;
1754	<
1755	<	if (nd.thick != .0 \|\| (!hitFront && !backvis)) {
1691	<	/* Proxy geometry present, so use it instead and transfer ray */
1692	<	photonRay(rayIn, &rayOut, PMAP_XFER, NULL);
1693	<	tracePhoton(&rayOut);
1694	<
1695	<	return 0;
1747	>	/* Load cal file */
1748	>	mf = hasthick ? getfunc(mat, 5, 0x1d, 1) : getfunc(mat, 4, 0xe, 1);
1749	>
1750	>	/* Get thickness */
1751	>	nd.thick = 0;
1752	>	if (hasthick) {
1753	>	nd.thick = evalue(mf -> ep [0]);
1754	>	if ((-FTINY <= nd.thick) & (nd.thick <= FTINY))
1755	>	nd.thick = .0;
1756		}
1757
1758		/* Get BSDF data */
1759	<	nd.sd = loadBSDF(mat -> oargs.sarg [1]);
1759	>	nd.sd = loadBSDF(mat -> oargs.sarg [hasthick]);
1760
1761		/* Extra diffuse reflectance from material def */
1762		if (hitFront) {
#	Line 1706 \| Line 1766 \| *static int bsdfPhotonScatter (OBJREC mat, RAY rayIn)*
1766		mat -> oargs.farg [2]);
1767		}
1768		else if (mat -> oargs.nfargs < 6) {
1769	<	/* Check for absorbing backside */
1770	<	if (!backvis && !nd.sd -> rb && !nd.sd -> tf) {
1771	<	SDfreeCache(nd.sd);
1772	<	return 0;
1769	>	/* Check for absorbing backside */
1770	>	if (!backvis && !nd.sd -> rb && !nd.sd -> tf) {
1771	>	SDfreeCache(nd.sd);
1772	>	return 0;
1773		}
1774
1775		setcolor(nd.rdiff, .0, .0, .0);
#	Line 1717 \| Line 1777 \| *static int bsdfPhotonScatter (OBJREC mat, RAY rayIn)*
1777		else setcolor(nd.rdiff, mat -> oargs.farg [3], mat -> oargs.farg [4],
1778		mat -> oargs.farg [5]);
1779
1780	<	/* Extra diffuse transmittance from material def */
1781	<	if (mat -> oargs.nfargs < 9)
1782	<	setcolor(nd.tdiff, .0, .0, .0);
1780	>	/* Extra diffuse transmittance from material def */
1781	>	if (mat -> oargs.nfargs < 9)
1782	>	setcolor(nd.tdiff, .0, .0, .0);
1783		else setcolor(nd.tdiff, mat -> oargs.farg [6], mat -> oargs.farg [7],
1784		mat -> oargs.farg [8]);
1785
1786		nd.mp = mat;
1787		nd.pr = rayIn;
1788	<
1788	>
1789		/* Get modifiers */
1790		raytexture(rayIn, mat -> omod);
1791
1792		/* Modify diffuse values */
1793		multcolor(nd.rdiff, rayIn -> pcol);
1794		multcolor(nd.tdiff, rayIn -> pcol);
1795	<
1795	>
1796		/* Get up vector & xform to world coords */
1797	<	upvec [0] = evalue(mf -> ep [1]);
1798	<	upvec [1] = evalue(mf -> ep [2]);
1799	<	upvec [2] = evalue(mf -> ep [3]);
1797	>	upvec [0] = evalue(mf -> ep [hasthick+0]);
1798	>	upvec [1] = evalue(mf -> ep [hasthick+1]);
1799	>	upvec [2] = evalue(mf -> ep [hasthick+2]);
1800
1801		if (mf -> fxp != &unitxf) {
1802		multv3(upvec, upvec, mf -> fxp -> xfm);
#	Line 1770 \| Line 1830 \| *static int bsdfPhotonScatter (OBJREC mat, RAY rayIn)*
1830		}
1831
1832		/* Determine BSDF resolution */
1833	<	err = SDsizeBSDF(nd.sr_vpsa, nd.vray, NULL, SDqueryMin + SDqueryMax, nd.sd);
1833	>	err = SDsizeBSDF(nd.sr_vpsa, nd.vray, NULL,
1834	>	SDqueryMin + SDqueryMax, nd.sd);
1835
1836		if (err)
1837		objerror(mat, USER, transSDError(err));
#	Line 1779 \| Line 1840 \| *static int bsdfPhotonScatter (OBJREC mat, RAY rayIn)*
1840		nd.sr_vpsa [1] = sqrt(nd.sr_vpsa [1]);
1841
1842		/* Orient perturbed normal towards incident side */
1843	<	if (!hitFront) {
1843	>	if (!hitFront) {
1844		nd.pnorm [0] = -nd.pnorm [0];
1845		nd.pnorm [1] = -nd.pnorm [1];
1846		nd.pnorm [2] = -nd.pnorm [2];
#	Line 1807 \| Line 1868 \| *static int bsdfPhotonScatter (OBJREC mat, RAY rayIn)*
1868		if (prDiff + ptDiff + prDiffSD + ptDiffSD > FTINY)
1869		addPhotons(rayIn);
1870
1871	<	xi = xi2 = pmapRandom(rouletteState);
1871	>	xi = pmapRandom(rouletteState);
1872
1873		if (xi > albedo)
1874		/* Absorbtion */
1875		return 0;
1876
1877	+	transmitted = 0;
1878	+
1879		if ((xi -= prDiff) <= 0) {
1880		/* Diffuse reflection (extra component in material def) */
1881		photonRay(rayIn, &rayOut, PMAP_DIFFREFL, nd.rdiff);
#	Line 1821 \| Line 1884 \| *static int bsdfPhotonScatter (OBJREC mat, RAY rayIn)*
1884
1885		else if ((xi -= ptDiff) <= 0) {
1886		/* Diffuse transmission (extra component in material def) */
1824	–	flipsurface(rayIn);
1887		photonRay(rayIn, &rayOut, PMAP_DIFFTRANS, nd.tdiff);
1888	<	diffPhotonScatter(nd.pnorm, &rayOut);
1888	>	diffPhotonScatter(nd.pnorm, &rayOut);
1889	>	transmitted = 1;
1890		}
1891	<
1891	>
1892		else { /* Sample SDF */
1893		if ((xi -= prDiffSD) <= 0) {
1894		/* Diffuse SDF reflection (constant component) */
1895	<	if ((err = SDsampBSDF(&bsdfVal, nd.vray, xi2,
1895	>	if ((err = SDsampBSDF(&bsdfVal, nd.vray, pmapRandom(scatterState),
1896		SDsampDf \| SDsampR, nd.sd)))
1897		objerror(mat, USER, transSDError(err));
1898
#	Line 1841 \| Line 1904 \| *static int bsdfPhotonScatter (OBJREC mat, RAY rayIn)*
1904
1905		else if ((xi -= ptDiffSD) <= 0) {
1906		/* Diffuse SDF transmission (constant component) */
1907	<	if ((err = SDsampBSDF(&bsdfVal, nd.vray, xi2,
1907	>	if ((err = SDsampBSDF(&bsdfVal, nd.vray, pmapRandom(scatterState),
1908		SDsampDf \| SDsampT, nd.sd)))
1909		objerror(mat, USER, transSDError(err));
1910
#	Line 1849 \| Line 1912 \| *static int bsdfPhotonScatter (OBJREC mat, RAY rayIn)*
1912		ccy2rgb(&bsdfVal.spec, bsdfVal.cieY, bsdfRGB);
1913		multcolor(bsdfRGB, rayIn -> pcol);
1914		addcolor(bsdfRGB, nd.tdiff);
1852	–	flipsurface(rayIn); /* Necessary? */
1915		photonRay(rayIn, &rayOut, PMAP_DIFFTRANS, bsdfRGB);
1916	+	transmitted = 1;
1917		}
1918
1919		else if ((xi -= prSpecSD) <= 0) {
1920		/* Non-diffuse ("specular") SDF reflection */
1921	<	if ((err = SDsampBSDF(&bsdfVal, nd.vray, xi2,
1921	>	if ((err = SDsampBSDF(&bsdfVal, nd.vray, pmapRandom(scatterState),
1922		SDsampSp \| SDsampR, nd.sd)))
1923		objerror(mat, USER, transSDError(err));
1924
#	Line 1865 \| Line 1928 \| *static int bsdfPhotonScatter (OBJREC mat, RAY rayIn)*
1928
1929		else {
1930		/* Non-diffuse ("specular") SDF transmission */
1931	<	if ((err = SDsampBSDF(&bsdfVal, nd.vray, xi2,
1931	>	if ((err = SDsampBSDF(&bsdfVal, nd.vray, pmapRandom(scatterState),
1932		SDsampSp \| SDsampT, nd.sd)))
1933		objerror(mat, USER, transSDError(err));
1934
1935		/* Apply pattern to spectral component */
1936		ccy2rgb(&bsdfVal.spec, bsdfVal.cieY, bsdfRGB);
1937		multcolor(bsdfRGB, rayIn -> pcol);
1875	–	flipsurface(rayIn); /* Necessary? */
1938		photonRay(rayIn, &rayOut, PMAP_SPECTRANS, bsdfRGB);
1939	+	transmitted = 1;
1940		}
1941
1942		/* Xform outgoing dir to world coords */
#	Line 1886 \| Line 1949 \| *static int bsdfPhotonScatter (OBJREC mat, RAY rayIn)*
1949		/* Clean up */
1950		SDfreeCache(nd.sd);
1951
1952	+	/* Offset outgoing photon origin by thickness to bypass proxy geometry */
1953	+	if (transmitted && nd.thick != 0)
1954	+	VSUM(rayOut.rorg, rayOut.rorg, rayIn -> ron, -nd.thick);
1955	+
1956		tracePhoton(&rayOut);
1957		return 0;
1958		}
1892	–	#endif
1959
1960
1961
1962		static int lightPhotonScatter (OBJREC* mat, RAY* ray)
1963	<	/* Light sources doan' reflect */
1963	>	/* Light sources doan' reflect, mang */
1964		{
1965		return 0;
1966		}
#	Line 1905 \| Line 1971 \| void initPhotonScatterFuncs ()
1971		/* Init photonScatter[] dispatch table */
1972		{
1973		int i;
1974	<
1974	>
1975	>	/* Catch-all for inconsistencies */
1976		for (i = 0; i < NUMOTYPE; i++)
1977		photonScatter [i] = o_default;
1978	<
1978	>
1979		photonScatter [MAT_LIGHT] = photonScatter [MAT_ILLUM] =
1980		photonScatter [MAT_GLOW] = photonScatter [MAT_SPOT] =
1981		lightPhotonScatter;
1982	<
1982	>
1983		photonScatter [MAT_PLASTIC] = photonScatter [MAT_METAL] =
1984		photonScatter [MAT_TRANS] = normalPhotonScatter;
1985
#	Line 1921 \| Line 1988 \| void initPhotonScatterFuncs ()
1988
1989		photonScatter [MAT_DIELECTRIC] = photonScatter [MAT_INTERFACE] =
1990		dielectricPhotonScatter;
1991	<
1991	>
1992		photonScatter [MAT_MIST] = mistPhotonScatter;
1993		photonScatter [MAT_GLASS] = glassPhotonScatter;
1994		photonScatter [MAT_CLIP] = clipPhotonScatter;
#	Line 1929 \| Line 1996 \| void initPhotonScatterFuncs ()
1996		photonScatter [MIX_FUNC] = mx_funcPhotonScatter;
1997		photonScatter [MIX_DATA] = mx_dataPhotonScatter;
1998		photonScatter [MIX_PICT]= mx_pdataPhotonScatter;
1999	<
1999	>
2000		photonScatter [PAT_BDATA] = photonScatter [PAT_CDATA] =
2001		photonScatter [PAT_BFUNC] = photonScatter [PAT_CFUNC] =
2002		photonScatter [PAT_CPICT] = photonScatter [TEX_FUNC] =
2003		photonScatter [TEX_DATA] = pattexPhotonScatter;
2004	<
2004	>
2005		photonScatter [MOD_ALIAS] = aliasPhotonScatter;
2006	<	photonScatter [MAT_BSDF] = bsdfPhotonScatter;
2006	>	photonScatter [MAT_BRTDF] = brdfPhotonScatter;
2007	>
2008	>	photonScatter [MAT_PFUNC] = photonScatter [MAT_MFUNC] =
2009	>	photonScatter [MAT_PDATA] = photonScatter [MAT_MDATA] =
2010	>	photonScatter [MAT_TFUNC] = photonScatter [MAT_TDATA] =
2011	>	brdf2PhotonScatter;
2012	>
2013	>	photonScatter [MAT_BSDF] = photonScatter [MAT_ABSDF] =
2014	>	bsdfPhotonScatter;
2015		}

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Comparing ray/src/rt/pmapmat.c (file contents): Revision 2.5 by greg, Thu May 21 05:54:54 2015 UTC vs. Revision 2.21 by rschregle, Thu Dec 6 20:00:35 2018 UTC

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Comparing ray/src/rt/pmapmat.c (file contents):
Revision 2.5 by greg, Thu May 21 05:54:54 2015 UTC vs.
Revision 2.21 by rschregle, Thu Dec 6 20:00:35 2018 UTC