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#ifndef lint |
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static const char RCSid[] = "$Id: pmapmat.c,v 4.17 2016/02/03 13:27:58 taschreg Exp taschreg $"; |
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#endif |
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/* |
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================================================================== |
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Photon map support routines for scattering by materials. |
7 |
|
8 |
Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
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(c) Fraunhofer Institute for Solar Energy Systems, |
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(c) Lucerne University of Applied Sciences and Arts, |
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supported by the Swiss National Science Foundation (SNSF, #147053) |
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================================================================== |
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|
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*/ |
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|
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|
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|
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#include "pmapmat.h" |
19 |
#include "pmapdata.h" |
20 |
#include "pmaprand.h" |
21 |
#include "otypes.h" |
22 |
#include "data.h" |
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#include "func.h" |
24 |
#include "bsdf.h" |
25 |
#include <math.h> |
26 |
|
27 |
|
28 |
|
29 |
/* Stuff ripped off from material modules */ |
30 |
#define MAXITER 10 |
31 |
#define SP_REFL 01 |
32 |
#define SP_TRAN 02 |
33 |
#define SP_PURE 04 |
34 |
#define SP_FLAT 010 |
35 |
#define SP_BADU 040 |
36 |
#define MLAMBDA 500 |
37 |
#define RINDEX 1.52 |
38 |
#define FRESNE(ci) (exp(-5.85*(ci)) - 0.00287989916) |
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|
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|
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|
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typedef struct { |
43 |
OBJREC *mp; |
44 |
RAY *rp; |
45 |
short specfl; |
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COLOR mcolor, scolor; |
47 |
FVECT vrefl, prdir, pnorm; |
48 |
double alpha2, rdiff, rspec, trans, tdiff, tspec, pdot; |
49 |
} NORMDAT; |
50 |
|
51 |
typedef struct { |
52 |
OBJREC *mp; |
53 |
RAY *rp; |
54 |
short specfl; |
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; |
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; |
69 |
SDData *sd; |
70 |
COLOR runsamp; |
71 |
COLOR rdiff; |
72 |
COLOR tunsamp; |
73 |
COLOR tdiff; |
74 |
} BSDFDAT; |
75 |
|
76 |
|
77 |
|
78 |
extern const SDCDst SDemptyCD; |
79 |
|
80 |
/* Per-material scattering function dispatch table; return value is usually |
81 |
* zero, indicating photon termination */ |
82 |
int (*photonScatter [NUMOTYPE]) (OBJREC*, RAY*); |
83 |
|
84 |
/* List of antimatter sensor modifier names and associated object set */ |
85 |
char *photonSensorList [MAXSET + 1] = {NULL}; |
86 |
static OBJECT photonSensorSet [MAXSET + 1] = {0}; |
87 |
|
88 |
|
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|
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/* ================ General support routines ================ */ |
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|
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|
93 |
void photonRay (const RAY *rayIn, RAY *rayOut, |
94 |
int rayOutType, COLOR fluxAtten) |
95 |
/* Spawn a new photon ray from a previous one; this is effectively a |
96 |
* customised rayorigin(). |
97 |
* A SPECULAR rayOutType flags this photon as _caustic_ for subsequent hits. |
98 |
* It is preserved for transferred rays (of type PMAP_XFER). |
99 |
* fluxAtten specifies the RGB attenuation of the photon flux effected by |
100 |
* the scattering material. The outgoing flux is then normalised to maintain |
101 |
* a uniform average of 1 over RGB. If fluxAtten == NULL, the flux remains |
102 |
* unchanged for the outgoing photon. fluxAtten is ignored for transferred |
103 |
* rays. |
104 |
* The ray direction is preserved for transferred rays, and undefined for |
105 |
* scattered rays and must be subsequently set by the caller. */ |
106 |
{ |
107 |
rayorigin(rayOut, rayOutType, rayIn, NULL); |
108 |
|
109 |
/* Transfer flux */ |
110 |
copycolor(rayOut -> rcol, rayIn -> rcol); |
111 |
|
112 |
/* Copy caustic flag & direction for transferred rays */ |
113 |
if (rayOutType == PMAP_XFER) { |
114 |
/* rayOut -> rtype |= rayIn -> rtype & SPECULAR; */ |
115 |
rayOut -> rtype |= rayIn -> rtype; |
116 |
VCOPY(rayOut -> rdir, rayIn -> rdir); |
117 |
} |
118 |
else if (fluxAtten) { |
119 |
/* Attenuate and normalise flux for scattered rays */ |
120 |
multcolor(rayOut -> rcol, fluxAtten); |
121 |
colorNorm(rayOut -> rcol); |
122 |
} |
123 |
|
124 |
/* Propagate index of emitting light source */ |
125 |
rayOut -> rsrc = rayIn -> rsrc; |
126 |
} |
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|
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|
129 |
|
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static void addPhotons (const RAY *r) |
131 |
/* Insert photon hits, where applicable */ |
132 |
{ |
133 |
if (!r -> rlvl) |
134 |
/* Add direct photon map at primary hitpoint */ |
135 |
addPhoton(directPmap, r); |
136 |
else { |
137 |
/* Add global or precomputed photon map at indirect hitpoint */ |
138 |
addPhoton(preCompPmap ? preCompPmap : globalPmap, r); |
139 |
|
140 |
/* Store caustic photon if specular flag set */ |
141 |
if (PMAP_CAUSTICRAY(r)) |
142 |
addPhoton(causticPmap, r); |
143 |
|
144 |
/* Store in contribution photon map */ |
145 |
addPhoton(contribPmap, r); |
146 |
} |
147 |
} |
148 |
|
149 |
|
150 |
|
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void getPhotonSensors (char **sensorList) |
152 |
/* Find antimatter geometry declared as photon sensors */ |
153 |
{ |
154 |
OBJECT i; |
155 |
OBJREC *obj; |
156 |
char **lp; |
157 |
|
158 |
/* Init sensor set */ |
159 |
photonSensorSet [0] = 0; |
160 |
|
161 |
if (!sensorList [0]) |
162 |
return; |
163 |
|
164 |
for (i = 0; i < nobjects; i++) { |
165 |
obj = objptr(i); |
166 |
|
167 |
/* Insert object in sensor set if it's in the specified sensor list |
168 |
* and of type antimatter */ |
169 |
for (lp = sensorList; *lp; lp++) { |
170 |
if (!strcmp(obj -> oname, *lp)) { |
171 |
if (obj -> otype != MAT_CLIP) { |
172 |
sprintf(errmsg, "photon sensor modifier %s is not antimatter", |
173 |
obj -> oname); |
174 |
error(USER, errmsg); |
175 |
} |
176 |
|
177 |
if (photonSensorSet [0] >= AMBLLEN) |
178 |
error(USER, "too many photon sensor modifiers"); |
179 |
|
180 |
insertelem(photonSensorSet, i); |
181 |
} |
182 |
} |
183 |
} |
184 |
|
185 |
if (!photonSensorSet [0]) |
186 |
error(USER, "no photon sensors found"); |
187 |
} |
188 |
|
189 |
|
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|
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/* ================ Material specific scattering routines ================ */ |
192 |
|
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|
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static int isoSpecPhotonScatter (NORMDAT *nd, RAY *rayOut) |
195 |
/* Generate direction for isotropically specularly reflected |
196 |
or transmitted ray. Returns 1 if successful. */ |
197 |
{ |
198 |
FVECT u, v, h; |
199 |
RAY *rayIn = nd -> rp; |
200 |
double d, d2, sinp, cosp; |
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int niter, i = 0; |
202 |
|
203 |
/* Set up sample coordinates */ |
204 |
getperpendicular(u, nd -> pnorm, 1); |
205 |
fcross(v, nd -> pnorm, u); |
206 |
|
207 |
if (nd -> specfl & SP_REFL) { |
208 |
/* Specular reflection; make MAXITER attempts at getting a ray */ |
209 |
|
210 |
for (niter = 0; niter < MAXITER; niter++) { |
211 |
d = 2 * PI * pmapRandom(scatterState); |
212 |
cosp = cos(d); |
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sinp = sin(d); |
214 |
d2 = pmapRandom(scatterState); |
215 |
d = d2 <= FTINY ? 1 : sqrt(nd -> alpha2 * -log(d2)); |
216 |
|
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for (i = 0; i < 3; i++) |
218 |
h [i] = nd -> pnorm [i] + d * (cosp * u [i] + sinp * v [i]); |
219 |
|
220 |
d = -2 * DOT(h, rayIn -> rdir) / (1 + d * d); |
221 |
VSUM(rayOut -> rdir, rayIn -> rdir, h, d); |
222 |
|
223 |
if (DOT(rayOut -> rdir, rayIn -> ron) > FTINY) |
224 |
return 1; |
225 |
} |
226 |
|
227 |
return 0; |
228 |
} |
229 |
|
230 |
else { |
231 |
/* Specular transmission; make MAXITER attempts at getting a ray */ |
232 |
|
233 |
for (niter = 0; niter < MAXITER; niter++) { |
234 |
d = 2 * PI * pmapRandom(scatterState); |
235 |
cosp = cos(d); |
236 |
sinp = sin(d); |
237 |
d2 = pmapRandom(scatterState); |
238 |
d = d2 <= FTINY ? 1 : sqrt(-log(d2) * nd -> alpha2); |
239 |
|
240 |
for (i = 0; i < 3; i++) |
241 |
rayOut -> rdir [i] = nd -> prdir [i] + |
242 |
d * (cosp * u [i] + sinp * v [i]); |
243 |
|
244 |
if (DOT(rayOut -> rdir, rayIn -> ron) < -FTINY) { |
245 |
normalize(rayOut -> rdir); |
246 |
return 1; |
247 |
} |
248 |
} |
249 |
|
250 |
return 0; |
251 |
} |
252 |
} |
253 |
|
254 |
|
255 |
|
256 |
static void diffPhotonScatter (FVECT normal, RAY* rayOut) |
257 |
/* Generate cosine-weighted direction for diffuse ray */ |
258 |
{ |
259 |
const RREAL cosThetaSqr = pmapRandom(scatterState), |
260 |
cosTheta = sqrt(cosThetaSqr), |
261 |
sinTheta = sqrt(1 - cosThetaSqr), |
262 |
phi = 2 * PI * pmapRandom(scatterState), |
263 |
du = cos(phi) * sinTheta, dv = sin(phi) * sinTheta; |
264 |
FVECT u, v; |
265 |
int i = 0; |
266 |
|
267 |
/* Set up sample coordinates */ |
268 |
getperpendicular(u, normal, 1); |
269 |
fcross(v, normal, u); |
270 |
|
271 |
/* Convert theta & phi to cartesian */ |
272 |
for (i = 0; i < 3; i++) |
273 |
rayOut -> rdir [i] = du * u [i] + dv * v [i] + cosTheta * normal [i]; |
274 |
|
275 |
normalize(rayOut -> rdir); |
276 |
} |
277 |
|
278 |
|
279 |
|
280 |
static int normalPhotonScatter (OBJREC *mat, RAY *rayIn) |
281 |
/* Generate new photon ray for isotropic material and recurse */ |
282 |
{ |
283 |
NORMDAT nd; |
284 |
int i, hastexture; |
285 |
float xi, albedo, prdiff, ptdiff, prspec, ptspec; |
286 |
double d, fresnel; |
287 |
RAY rayOut; |
288 |
|
289 |
if (mat -> oargs.nfargs != (mat -> otype == MAT_TRANS ? 7 : 5)) |
290 |
objerror(mat, USER, "bad number of arguments"); |
291 |
|
292 |
/* Check for back side; reorient if back is visible */ |
293 |
if (rayIn -> rod < 0) |
294 |
if (!backvis && mat -> otype != MAT_TRANS) |
295 |
return 0; |
296 |
else { |
297 |
/* Get modifiers */ |
298 |
raytexture(rayIn, mat -> omod); |
299 |
flipsurface(rayIn); |
300 |
} |
301 |
else raytexture(rayIn, mat -> omod); |
302 |
|
303 |
nd.rp = rayIn; |
304 |
|
305 |
/* Get material color */ |
306 |
copycolor(nd.mcolor, mat -> oargs.farg); |
307 |
|
308 |
/* Get roughness */ |
309 |
nd.specfl = 0; |
310 |
nd.alpha2 = mat -> oargs.farg [4]; |
311 |
|
312 |
if ((nd.alpha2 *= nd.alpha2) <= FTINY) |
313 |
nd.specfl |= SP_PURE; |
314 |
|
315 |
if (rayIn -> ro != NULL && isflat(rayIn -> ro -> otype)) |
316 |
nd.specfl |= SP_FLAT; |
317 |
|
318 |
/* Perturb normal */ |
319 |
if ((hastexture = (DOT(rayIn -> pert, rayIn -> pert) > sqr(FTINY)) )) |
320 |
nd.pdot = raynormal(nd.pnorm, rayIn); |
321 |
else { |
322 |
VCOPY(nd.pnorm, rayIn -> ron); |
323 |
nd.pdot = rayIn -> rod; |
324 |
} |
325 |
|
326 |
nd.pdot = max(nd.pdot, .001); |
327 |
|
328 |
/* Modify material color */ |
329 |
multcolor(nd.mcolor, rayIn -> pcol); |
330 |
nd.rspec = mat -> oargs.farg [3]; |
331 |
|
332 |
/* Approximate Fresnel term */ |
333 |
if (nd.specfl & SP_PURE && nd.rspec > FTINY) { |
334 |
fresnel = FRESNE(rayIn -> rod); |
335 |
nd.rspec += fresnel * (1 - nd.rspec); |
336 |
} |
337 |
else fresnel = 0; |
338 |
|
339 |
/* Transmission params */ |
340 |
if (mat -> otype == MAT_TRANS) { |
341 |
nd.trans = mat -> oargs.farg [5] * (1 - nd.rspec); |
342 |
nd.tspec = nd.trans * mat -> oargs.farg [6]; |
343 |
nd.tdiff = nd.trans - nd.tspec; |
344 |
} |
345 |
else nd.tdiff = nd.tspec = nd.trans = 0; |
346 |
|
347 |
/* Specular reflection params */ |
348 |
if (nd.rspec > FTINY) { |
349 |
/* Specular color */ |
350 |
if (mat -> otype != MAT_METAL) |
351 |
setcolor(nd.scolor, nd.rspec, nd.rspec, nd.rspec); |
352 |
else if (fresnel > FTINY) { |
353 |
d = nd.rspec * (1 - fresnel); |
354 |
for (i = 0; i < 3; i++) |
355 |
nd.scolor [i] = fresnel + nd.mcolor [i] * d; |
356 |
} |
357 |
else { |
358 |
copycolor(nd.scolor, nd.mcolor); |
359 |
scalecolor(nd.scolor, nd.rspec); |
360 |
} |
361 |
} |
362 |
else setcolor(nd.scolor, 0, 0, 0); |
363 |
|
364 |
/* Diffuse reflection params */ |
365 |
nd.rdiff = 1 - nd.trans - nd.rspec; |
366 |
|
367 |
/* Set up probabilities */ |
368 |
prdiff = ptdiff = ptspec = colorAvg(nd.mcolor); |
369 |
prdiff *= nd.rdiff; |
370 |
ptdiff *= nd.tdiff; |
371 |
prspec = colorAvg(nd.scolor); |
372 |
ptspec *= nd.tspec; |
373 |
albedo = prdiff + ptdiff + prspec + ptspec; |
374 |
|
375 |
/* Insert direct and indirect photon hits if diffuse component */ |
376 |
if (prdiff > FTINY || ptdiff > FTINY) |
377 |
addPhotons(rayIn); |
378 |
|
379 |
xi = pmapRandom(rouletteState); |
380 |
|
381 |
if (xi > albedo) |
382 |
/* Absorbed */ |
383 |
return 0; |
384 |
|
385 |
if (xi > (albedo -= prspec)) { |
386 |
/* Specular reflection */ |
387 |
nd.specfl |= SP_REFL; |
388 |
|
389 |
if (nd.specfl & SP_PURE) { |
390 |
/* Perfect specular reflection */ |
391 |
for (i = 0; i < 3; i++) { |
392 |
/* Reflected ray */ |
393 |
nd.vrefl [i] = rayIn -> rdir [i] + 2 * nd.pdot * nd.pnorm [i]; |
394 |
} |
395 |
|
396 |
/* Penetration? */ |
397 |
if (hastexture && DOT(nd.vrefl, rayIn -> ron) <= FTINY) |
398 |
for (i = 0; i < 3; i++) { |
399 |
/* Safety measure */ |
400 |
nd.vrefl [i] = rayIn -> rdir [i] + |
401 |
2 * rayIn -> rod * rayIn -> ron [i]; |
402 |
} |
403 |
|
404 |
VCOPY(rayOut.rdir, nd.vrefl); |
405 |
} |
406 |
|
407 |
else if (!isoSpecPhotonScatter(&nd, &rayOut)) |
408 |
return 0; |
409 |
|
410 |
photonRay(rayIn, &rayOut, PMAP_SPECREFL, nd.scolor); |
411 |
} |
412 |
|
413 |
else if (xi > (albedo -= ptspec)) { |
414 |
/* Specular transmission */ |
415 |
nd.specfl |= SP_TRAN; |
416 |
|
417 |
if (hastexture) { |
418 |
/* Perturb */ |
419 |
for (i = 0; i < 3; i++) |
420 |
nd.prdir [i] = rayIn -> rdir [i] - rayIn -> pert [i]; |
421 |
|
422 |
if (DOT(nd.prdir, rayIn -> ron) < -FTINY) |
423 |
normalize(nd.prdir); |
424 |
else VCOPY(nd.prdir, rayIn -> rdir); |
425 |
} |
426 |
else VCOPY(nd.prdir, rayIn -> rdir); |
427 |
|
428 |
if ((nd.specfl & (SP_TRAN | SP_PURE)) == (SP_TRAN | SP_PURE)) |
429 |
/* Perfect specular transmission */ |
430 |
VCOPY(rayOut.rdir, nd.prdir); |
431 |
else if (!isoSpecPhotonScatter(&nd, &rayOut)) |
432 |
return 0; |
433 |
|
434 |
photonRay(rayIn, &rayOut, PMAP_SPECTRANS, nd.mcolor); |
435 |
} |
436 |
|
437 |
else if (xi > (albedo -= prdiff)) { |
438 |
/* Diffuse reflection */ |
439 |
photonRay(rayIn, &rayOut, PMAP_DIFFREFL, nd.mcolor); |
440 |
diffPhotonScatter(hastexture ? nd.pnorm : rayIn -> ron, &rayOut); |
441 |
} |
442 |
|
443 |
else { |
444 |
/* Diffuse transmission */ |
445 |
flipsurface(rayIn); |
446 |
photonRay(rayIn, &rayOut, PMAP_DIFFTRANS, nd.mcolor); |
447 |
|
448 |
if (hastexture) { |
449 |
FVECT bnorm; |
450 |
bnorm [0] = -nd.pnorm [0]; |
451 |
bnorm [1] = -nd.pnorm [1]; |
452 |
bnorm [2] = -nd.pnorm [2]; |
453 |
diffPhotonScatter(bnorm, &rayOut); |
454 |
} |
455 |
else diffPhotonScatter(rayIn -> ron, &rayOut); |
456 |
} |
457 |
|
458 |
tracePhoton(&rayOut); |
459 |
return 0; |
460 |
} |
461 |
|
462 |
|
463 |
|
464 |
static void getacoords (ANISODAT *np) |
465 |
/* Set up coordinate system for anisotropic sampling; cloned from aniso.c */ |
466 |
{ |
467 |
MFUNC *mf; |
468 |
int i; |
469 |
|
470 |
mf = getfunc(np->mp, 3, 0x7, 1); |
471 |
setfunc(np->mp, np->rp); |
472 |
errno = 0; |
473 |
|
474 |
for (i = 0; i < 3; i++) |
475 |
np->u[i] = evalue(mf->ep[i]); |
476 |
|
477 |
if ((errno == EDOM) | (errno == ERANGE)) { |
478 |
objerror(np->mp, WARNING, "compute error"); |
479 |
np->specfl |= SP_BADU; |
480 |
return; |
481 |
} |
482 |
|
483 |
if (mf->fxp != &unitxf) |
484 |
multv3(np->u, np->u, mf->fxp->xfm); |
485 |
|
486 |
fcross(np->v, np->pnorm, np->u); |
487 |
|
488 |
if (normalize(np->v) == 0.0) { |
489 |
objerror(np->mp, WARNING, "illegal orientation vector"); |
490 |
np->specfl |= SP_BADU; |
491 |
return; |
492 |
} |
493 |
|
494 |
fcross(np->u, np->v, np->pnorm); |
495 |
} |
496 |
|
497 |
|
498 |
|
499 |
static int anisoSpecPhotonScatter (ANISODAT *nd, RAY *rayOut) |
500 |
/* Generate direction for anisotropically specularly reflected |
501 |
or transmitted ray. Returns 1 if successful. */ |
502 |
{ |
503 |
FVECT h; |
504 |
double d, d2, sinp, cosp; |
505 |
int niter, i; |
506 |
RAY *rayIn = nd -> rp; |
507 |
|
508 |
if (rayIn -> ro != NULL && isflat(rayIn -> ro -> otype)) |
509 |
nd -> specfl |= SP_FLAT; |
510 |
|
511 |
/* set up coordinates */ |
512 |
getacoords(nd); |
513 |
|
514 |
if (rayOut -> rtype & TRANS) { |
515 |
/* Specular transmission */ |
516 |
|
517 |
if (DOT(rayIn -> pert, rayIn -> pert) <= FTINY * FTINY) |
518 |
VCOPY(nd -> prdir, rayIn -> rdir); |
519 |
else { |
520 |
/* perturb */ |
521 |
for (i = 0; i < 3; i++) |
522 |
nd -> prdir [i] = rayIn -> rdir [i] - rayIn -> pert [i]; |
523 |
|
524 |
if (DOT(nd -> prdir, rayIn -> ron) < -FTINY) |
525 |
normalize(nd -> prdir); |
526 |
else VCOPY(nd -> prdir, rayIn -> rdir); |
527 |
} |
528 |
|
529 |
/* Make MAXITER attempts at getting a ray */ |
530 |
for (niter = 0; niter < MAXITER; niter++) { |
531 |
d = 2 * PI * pmapRandom(scatterState); |
532 |
cosp = cos(d) * nd -> u_alpha; |
533 |
sinp = sin(d) * nd -> v_alpha; |
534 |
d = sqrt(sqr(cosp) + sqr(sinp)); |
535 |
cosp /= d; |
536 |
sinp /= d; |
537 |
d2 = pmapRandom(scatterState); |
538 |
d = d2 <= FTINY ? 1 |
539 |
: sqrt(-log(d2) / |
540 |
(sqr(cosp) / sqr(nd -> u_alpha) + |
541 |
sqr(sinp) / (nd -> v_alpha * nd -> u_alpha))); |
542 |
|
543 |
for (i = 0; i < 3; i++) |
544 |
rayOut -> rdir [i] = nd -> prdir [i] + d * |
545 |
(cosp * nd -> u [i] + sinp * nd -> v [i]); |
546 |
|
547 |
if (DOT(rayOut -> rdir, rayIn -> ron) < -FTINY) { |
548 |
normalize(rayOut -> rdir); |
549 |
return 1; |
550 |
} |
551 |
} |
552 |
|
553 |
return 0; |
554 |
} |
555 |
|
556 |
else { |
557 |
/* Specular reflection */ |
558 |
|
559 |
/* Make MAXITER attempts at getting a ray */ |
560 |
for (niter = 0; niter < MAXITER; niter++) { |
561 |
d = 2 * PI * pmapRandom(scatterState); |
562 |
cosp = cos(d) * nd -> u_alpha; |
563 |
sinp = sin(d) * nd -> v_alpha; |
564 |
d = sqrt(sqr(cosp) + sqr(sinp)); |
565 |
cosp /= d; |
566 |
sinp /= d; |
567 |
d2 = pmapRandom(scatterState); |
568 |
d = d2 <= FTINY ? 1 |
569 |
: sqrt(-log(d2) / |
570 |
(sqr(cosp) / sqr(nd -> u_alpha) + |
571 |
sqr(sinp) / (nd -> v_alpha * nd -> v_alpha))); |
572 |
|
573 |
for (i = 0; i < 3; i++) |
574 |
h [i] = nd -> pnorm [i] + |
575 |
d * (cosp * nd -> u [i] + sinp * nd -> v [i]); |
576 |
|
577 |
d = -2 * DOT(h, rayIn -> rdir) / (1 + d * d); |
578 |
VSUM(rayOut -> rdir, rayIn -> rdir, h, d); |
579 |
|
580 |
if (DOT(rayOut -> rdir, rayIn -> ron) > FTINY) |
581 |
return 1; |
582 |
} |
583 |
|
584 |
return 0; |
585 |
} |
586 |
} |
587 |
|
588 |
|
589 |
|
590 |
static int anisoPhotonScatter (OBJREC *mat, RAY *rayIn) |
591 |
/* Generate new photon ray for anisotropic material and recurse */ |
592 |
{ |
593 |
ANISODAT nd; |
594 |
float xi, albedo, prdiff, ptdiff, prspec, ptspec; |
595 |
RAY rayOut; |
596 |
|
597 |
if (mat -> oargs.nfargs != (mat -> otype == MAT_TRANS2 ? 8 : 6)) |
598 |
objerror(mat, USER, "bad number of real arguments"); |
599 |
|
600 |
nd.rp = rayIn; |
601 |
nd.mp = objptr(rayIn -> ro -> omod); |
602 |
|
603 |
/* get material color */ |
604 |
copycolor(nd.mcolor, mat -> oargs.farg); |
605 |
|
606 |
/* get roughness */ |
607 |
nd.specfl = 0; |
608 |
nd.u_alpha = mat -> oargs.farg [4]; |
609 |
nd.v_alpha = mat -> oargs.farg [5]; |
610 |
if (nd.u_alpha < FTINY || nd.v_alpha <= FTINY) |
611 |
objerror(mat, USER, "roughness too small"); |
612 |
|
613 |
/* check for back side; reorient if back is visible */ |
614 |
if (rayIn -> rod < 0) |
615 |
if (!backvis && mat -> otype != MAT_TRANS2) |
616 |
return 0; |
617 |
else { |
618 |
/* get modifiers */ |
619 |
raytexture(rayIn, mat -> omod); |
620 |
flipsurface(rayIn); |
621 |
} |
622 |
else raytexture(rayIn, mat -> omod); |
623 |
|
624 |
/* perturb normal */ |
625 |
nd.pdot = max(raynormal(nd.pnorm, rayIn), .001); |
626 |
|
627 |
/* modify material color */ |
628 |
multcolor(nd.mcolor, rayIn -> pcol); |
629 |
nd.rspec = mat -> oargs.farg [3]; |
630 |
|
631 |
/* transmission params */ |
632 |
if (mat -> otype == MAT_TRANS2) { |
633 |
nd.trans = mat -> oargs.farg [6] * (1 - nd.rspec); |
634 |
nd.tspec = nd.trans * mat -> oargs.farg [7]; |
635 |
nd.tdiff = nd.trans - nd.tspec; |
636 |
if (nd.tspec > FTINY) |
637 |
nd.specfl |= SP_TRAN; |
638 |
} |
639 |
else nd.tdiff = nd.tspec = nd.trans = 0; |
640 |
|
641 |
/* specular reflection params */ |
642 |
if (nd.rspec > FTINY) { |
643 |
nd.specfl |= SP_REFL; |
644 |
|
645 |
/* comput e specular color */ |
646 |
if (mat -> otype == MAT_METAL2) |
647 |
copycolor(nd.scolor, nd.mcolor); |
648 |
else setcolor(nd.scolor, 1, 1, 1); |
649 |
|
650 |
scalecolor(nd.scolor, nd.rspec); |
651 |
} |
652 |
else setcolor(nd.scolor, 0, 0, 0); |
653 |
|
654 |
/* diffuse reflection params */ |
655 |
nd.rdiff = 1 - nd.trans - nd.rspec; |
656 |
|
657 |
/* Set up probabilities */ |
658 |
prdiff = ptdiff = ptspec = colorAvg(nd.mcolor); |
659 |
prdiff *= nd.rdiff; |
660 |
ptdiff *= nd.tdiff; |
661 |
prspec = colorAvg(nd.scolor); |
662 |
ptspec *= nd.tspec; |
663 |
albedo = prdiff + ptdiff + prspec + ptspec; |
664 |
|
665 |
/* Insert direct and indirect photon hits if diffuse component */ |
666 |
if (prdiff > FTINY || ptdiff > FTINY) |
667 |
addPhotons(rayIn); |
668 |
|
669 |
xi = pmapRandom(rouletteState); |
670 |
|
671 |
if (xi > albedo) |
672 |
/* Absorbed */ |
673 |
return 0; |
674 |
|
675 |
if (xi > (albedo -= prspec)) |
676 |
/* Specular reflection */ |
677 |
if (!(nd.specfl & SP_BADU)) { |
678 |
photonRay(rayIn, &rayOut, PMAP_SPECREFL, nd.scolor); |
679 |
|
680 |
if (!anisoSpecPhotonScatter(&nd, &rayOut)) |
681 |
return 0; |
682 |
} |
683 |
else return 0; |
684 |
|
685 |
else if (xi > (albedo -= ptspec)) |
686 |
/* Specular transmission */ |
687 |
|
688 |
if (!(nd.specfl & SP_BADU)) { |
689 |
/* Specular transmission */ |
690 |
photonRay(rayIn, &rayOut, PMAP_SPECTRANS, nd.mcolor); |
691 |
|
692 |
if (!anisoSpecPhotonScatter(&nd, &rayOut)) |
693 |
return 0; |
694 |
} |
695 |
else return 0; |
696 |
|
697 |
else if (xi > (albedo -= prdiff)) { |
698 |
/* Diffuse reflection */ |
699 |
photonRay(rayIn, &rayOut, PMAP_DIFFREFL, nd.mcolor); |
700 |
diffPhotonScatter(nd.pnorm, &rayOut); |
701 |
} |
702 |
|
703 |
else { |
704 |
/* Diffuse transmission */ |
705 |
FVECT bnorm; |
706 |
flipsurface(rayIn); |
707 |
bnorm [0] = -nd.pnorm [0]; |
708 |
bnorm [1] = -nd.pnorm [1]; |
709 |
bnorm [2] = -nd.pnorm [2]; |
710 |
|
711 |
photonRay(rayIn, &rayOut, PMAP_DIFFTRANS, nd.mcolor); |
712 |
diffPhotonScatter(bnorm, &rayOut); |
713 |
} |
714 |
|
715 |
tracePhoton(&rayOut); |
716 |
return 0; |
717 |
} |
718 |
|
719 |
|
720 |
static double mylog (double x) |
721 |
/* special log for extinction coefficients; cloned from dielectric.c */ |
722 |
{ |
723 |
if (x < 1e-40) |
724 |
return(-100.); |
725 |
|
726 |
if (x >= 1.) |
727 |
return(0.); |
728 |
|
729 |
return(log(x)); |
730 |
} |
731 |
|
732 |
|
733 |
static int dielectricPhotonScatter (OBJREC *mat, RAY *rayIn) |
734 |
/* Generate new photon ray for dielectric material and recurse */ |
735 |
{ |
736 |
double cos1, cos2, nratio, d1, d2, refl; |
737 |
COLOR ctrans, talb; |
738 |
FVECT dnorm; |
739 |
int hastexture, i; |
740 |
RAY rayOut; |
741 |
|
742 |
if (mat -> oargs.nfargs != (mat -> otype == MAT_DIELECTRIC ? 5 : 8)) |
743 |
objerror(mat, USER, "bad arguments"); |
744 |
|
745 |
/* get modifiers */ |
746 |
raytexture(rayIn, mat -> omod); |
747 |
|
748 |
if ((hastexture = (DOT(rayIn -> pert, rayIn -> pert) > FTINY * FTINY))) |
749 |
/* Perturb normal */ |
750 |
cos1 = raynormal(dnorm, rayIn); |
751 |
else { |
752 |
VCOPY(dnorm, rayIn -> ron); |
753 |
cos1 = rayIn -> rod; |
754 |
} |
755 |
|
756 |
/* index of refraction */ |
757 |
nratio = mat -> otype == |
758 |
MAT_DIELECTRIC ? mat -> oargs.farg [3] + mat -> oargs.farg [4] / MLAMBDA |
759 |
: mat -> oargs.farg [3] / mat -> oargs.farg [7]; |
760 |
|
761 |
if (cos1 < 0) { |
762 |
/* inside */ |
763 |
hastexture = -hastexture; |
764 |
cos1 = -cos1; |
765 |
dnorm [0] = -dnorm [0]; |
766 |
dnorm [1] = -dnorm [1]; |
767 |
dnorm [2] = -dnorm [2]; |
768 |
setcolor(rayIn -> cext, |
769 |
-mylog(mat -> oargs.farg [0] * rayIn -> pcol [0]), |
770 |
-mylog(mat -> oargs.farg [1] * rayIn -> pcol [1]), |
771 |
-mylog(mat -> oargs.farg [2] * rayIn -> pcol [2])); |
772 |
setcolor(rayIn -> albedo, 0, 0, 0); |
773 |
rayIn -> gecc = 0; |
774 |
|
775 |
if (mat -> otype == MAT_INTERFACE) { |
776 |
setcolor(ctrans, |
777 |
-mylog(mat -> oargs.farg [4] * rayIn -> pcol [0]), |
778 |
-mylog(mat -> oargs.farg [5] * rayIn -> pcol [1]), |
779 |
-mylog(mat -> oargs.farg [6] * rayIn -> pcol [2])); |
780 |
setcolor(talb, 0, 0, 0); |
781 |
} |
782 |
else { |
783 |
copycolor(ctrans, cextinction); |
784 |
copycolor(talb, salbedo); |
785 |
} |
786 |
} |
787 |
|
788 |
else { |
789 |
/* outside */ |
790 |
nratio = 1.0 / nratio; |
791 |
setcolor(ctrans, |
792 |
-mylog(mat -> oargs.farg [0] * rayIn -> pcol [0]), |
793 |
-mylog(mat -> oargs.farg [1] * rayIn -> pcol [1]), |
794 |
-mylog(mat -> oargs.farg [2] * rayIn -> pcol [2])); |
795 |
setcolor(talb, 0, 0, 0); |
796 |
|
797 |
if (mat -> otype == MAT_INTERFACE) { |
798 |
setcolor(rayIn -> cext, |
799 |
-mylog(mat -> oargs.farg [4] * rayIn -> pcol [0]), |
800 |
-mylog(mat -> oargs.farg [5] * rayIn -> pcol [1]), |
801 |
-mylog(mat -> oargs.farg [6] * rayIn -> pcol [2])); |
802 |
setcolor(rayIn -> albedo, 0, 0, 0); |
803 |
rayIn -> gecc = 0; |
804 |
} |
805 |
} |
806 |
|
807 |
/* compute cos theta2 */ |
808 |
d2 = 1 - sqr(nratio) * (1 - sqr(cos1)); |
809 |
|
810 |
if (d2 < FTINY) { |
811 |
/* Total reflection */ |
812 |
refl = cos2 = 1.0; |
813 |
} |
814 |
else { |
815 |
/* Refraction, compute Fresnel's equations */ |
816 |
cos2 = sqrt(d2); |
817 |
d1 = cos1; |
818 |
d2 = nratio * cos2; |
819 |
d1 = (d1 - d2) / (d1 + d2); |
820 |
refl = sqr(d1); |
821 |
d1 = 1 / cos1; |
822 |
d2 = nratio / cos2; |
823 |
d1 = (d1 - d2) / (d1 + d2); |
824 |
refl += sqr(d1); |
825 |
refl *= 0.5; |
826 |
} |
827 |
|
828 |
if (pmapRandom(rouletteState) > refl) { |
829 |
/* Refraction */ |
830 |
photonRay(rayIn, &rayOut, PMAP_REFRACT, NULL); |
831 |
d1 = nratio * cos1 - cos2; |
832 |
|
833 |
for (i = 0; i < 3; i++) |
834 |
rayOut.rdir [i] = nratio * rayIn -> rdir [i] + d1 * dnorm [i]; |
835 |
|
836 |
if (hastexture && DOT(rayOut.rdir, rayIn -> ron) * hastexture >= -FTINY) { |
837 |
d1 *= hastexture; |
838 |
|
839 |
for (i = 0; i < 3; i++) |
840 |
rayOut.rdir [i] = nratio * rayIn -> rdir [i] + |
841 |
d1 * rayIn -> ron [i]; |
842 |
|
843 |
normalize(rayOut.rdir); |
844 |
} |
845 |
|
846 |
copycolor(rayOut.cext, ctrans); |
847 |
copycolor(rayOut.albedo, talb); |
848 |
} |
849 |
|
850 |
else { |
851 |
/* Reflection */ |
852 |
photonRay(rayIn, &rayOut, PMAP_SPECREFL, NULL); |
853 |
VSUM(rayOut.rdir, rayIn -> rdir, dnorm, 2 * cos1); |
854 |
|
855 |
if (hastexture && DOT(rayOut.rdir, rayIn -> ron) * hastexture <= FTINY) |
856 |
for (i = 0; i < 3; i++) |
857 |
rayOut.rdir [i] = rayIn -> rdir [i] + |
858 |
2 * rayIn -> rod * rayIn -> ron [i]; |
859 |
} |
860 |
|
861 |
/* Ray is modified by medium defined by cext and albedo in |
862 |
* photonParticipate() */ |
863 |
tracePhoton(&rayOut); |
864 |
|
865 |
return 0; |
866 |
} |
867 |
|
868 |
|
869 |
|
870 |
static int glassPhotonScatter (OBJREC *mat, RAY *rayIn) |
871 |
/* Generate new photon ray for glass material and recurse */ |
872 |
{ |
873 |
float albedo, xi, ptrans; |
874 |
COLOR mcolor, refl, trans; |
875 |
double pdot, cos2, d, r1e, r1m, rindex = 0.0; |
876 |
FVECT pnorm, pdir; |
877 |
int hastexture, i; |
878 |
RAY rayOut; |
879 |
|
880 |
/* check arguments */ |
881 |
if (mat -> oargs.nfargs == 3) |
882 |
rindex = RINDEX; |
883 |
else if (mat -> oargs.nfargs == 4) |
884 |
rindex = mat -> oargs.farg [3]; |
885 |
else objerror(mat, USER, "bad arguments"); |
886 |
|
887 |
copycolor(mcolor, mat -> oargs.farg); |
888 |
|
889 |
/* get modifiers */ |
890 |
raytexture(rayIn, mat -> omod); |
891 |
|
892 |
/* reorient if necessary */ |
893 |
if (rayIn -> rod < 0) |
894 |
flipsurface(rayIn); |
895 |
if ((hastexture = (DOT(rayIn -> pert, rayIn -> pert) > FTINY * FTINY) )) |
896 |
pdot = raynormal(pnorm, rayIn); |
897 |
else { |
898 |
VCOPY(pnorm, rayIn -> ron); |
899 |
pdot = rayIn -> rod; |
900 |
} |
901 |
|
902 |
/* Modify material color */ |
903 |
multcolor(mcolor, rayIn -> pcol); |
904 |
|
905 |
/* angular transmission */ |
906 |
cos2 = sqrt((1 - 1 / sqr(rindex)) + sqr(pdot / rindex)); |
907 |
setcolor(mcolor, pow(mcolor [0], 1 / cos2), pow(mcolor [1], 1 / cos2), |
908 |
pow(mcolor [2], 1 / cos2)); |
909 |
|
910 |
/* compute reflection */ |
911 |
r1e = (pdot - rindex * cos2) / (pdot + rindex * cos2); |
912 |
r1e *= r1e; |
913 |
r1m = (1 / pdot - rindex / cos2) / (1 / pdot + rindex / cos2); |
914 |
r1m *= r1m; |
915 |
|
916 |
for (i = 0; i < 3; i++) { |
917 |
double r1ed2, r1md2, d2; |
918 |
|
919 |
d = mcolor [i]; |
920 |
d2 = sqr(d); |
921 |
r1ed2 = sqr(r1e) * d2; |
922 |
r1md2 = sqr(r1m) * d2; |
923 |
|
924 |
/* compute transmittance */ |
925 |
trans [i] = 0.5 * d * |
926 |
(sqr(1 - r1e) / (1 - r1ed2) + sqr(1 - r1m) / (1 - r1md2)); |
927 |
|
928 |
/* compute reflectance */ |
929 |
refl [i] = 0.5 * (r1e * (1 + (1 - 2 * r1e) * d2) / (1 - r1ed2) + |
930 |
r1m * (1 + (1 - 2 * r1m) * d2) / (1 - r1md2)); |
931 |
} |
932 |
|
933 |
/* Set up probabilities */ |
934 |
ptrans = colorAvg(trans); |
935 |
albedo = colorAvg(refl) + ptrans; |
936 |
xi = pmapRandom(rouletteState); |
937 |
|
938 |
|
939 |
if (xi > albedo) |
940 |
/* Absorbed */ |
941 |
return 0; |
942 |
|
943 |
if (xi > (albedo -= ptrans)) { |
944 |
/* Transmitted */ |
945 |
|
946 |
if (hastexture) { |
947 |
/* perturb direction */ |
948 |
VSUM(pdir, rayIn -> rdir, rayIn -> pert, 2 * (1 - rindex)); |
949 |
|
950 |
if (normalize(pdir) == 0) { |
951 |
objerror(mat, WARNING, "bad perturbation"); |
952 |
VCOPY(pdir, rayIn -> rdir); |
953 |
} |
954 |
} |
955 |
else VCOPY(pdir, rayIn -> rdir); |
956 |
|
957 |
VCOPY(rayOut.rdir, pdir); |
958 |
photonRay(rayIn, &rayOut, PMAP_SPECTRANS, mcolor); |
959 |
} |
960 |
|
961 |
else { |
962 |
/* reflected ray */ |
963 |
VSUM(rayOut.rdir, rayIn -> rdir, pnorm, 2 * pdot); |
964 |
photonRay(rayIn, &rayOut, PMAP_SPECREFL, mcolor); |
965 |
} |
966 |
|
967 |
tracePhoton(&rayOut); |
968 |
return 0; |
969 |
} |
970 |
|
971 |
|
972 |
|
973 |
static int aliasPhotonScatter (OBJREC *mat, RAY *rayIn) |
974 |
/* Transfer photon scattering to alias target */ |
975 |
{ |
976 |
OBJECT aliasObj; |
977 |
OBJREC aliasRec; |
978 |
|
979 |
/* Straight replacement? */ |
980 |
if (!mat -> oargs.nsargs) { |
981 |
/* Skip void modifier! */ |
982 |
if (mat -> omod != OVOID) { |
983 |
mat = objptr(mat -> omod); |
984 |
photonScatter [mat -> otype] (mat, rayIn); |
985 |
} |
986 |
|
987 |
return 0; |
988 |
} |
989 |
|
990 |
/* Else replace alias */ |
991 |
if (mat -> oargs.nsargs != 1) |
992 |
objerror(mat, INTERNAL, "bad # string arguments"); |
993 |
|
994 |
aliasObj = lastmod(objndx(mat), mat -> oargs.sarg [0]); |
995 |
|
996 |
if (aliasObj < 0) |
997 |
objerror(mat, USER, "bad reference"); |
998 |
|
999 |
memcpy(&aliasRec, objptr(aliasObj), sizeof(OBJREC)); |
1000 |
|
1001 |
/* Substitute modifier */ |
1002 |
aliasRec.omod = mat -> omod; |
1003 |
|
1004 |
/* Replacement scattering routine */ |
1005 |
photonScatter [aliasRec.otype] (&aliasRec, rayIn); |
1006 |
return 0; |
1007 |
} |
1008 |
|
1009 |
|
1010 |
|
1011 |
static int clipPhotonScatter (OBJREC *mat, RAY *rayIn) |
1012 |
/* Generate new photon ray for antimatter material and recurse */ |
1013 |
{ |
1014 |
OBJECT obj = objndx(mat), mod, cset [MAXSET + 1], *modset; |
1015 |
int entering, inside = 0, i; |
1016 |
const RAY *rp; |
1017 |
RAY rayOut; |
1018 |
|
1019 |
if ((modset = (OBJECT*)mat -> os) == NULL) { |
1020 |
if (mat -> oargs.nsargs < 1 || mat -> oargs.nsargs > MAXSET) |
1021 |
objerror(mat, USER, "bad # arguments"); |
1022 |
|
1023 |
modset = (OBJECT*)malloc((mat -> oargs.nsargs + 1) * sizeof(OBJECT)); |
1024 |
|
1025 |
if (modset == NULL) |
1026 |
error(SYSTEM, "out of memory in clipPhotonScatter"); |
1027 |
modset [0] = 0; |
1028 |
|
1029 |
for (i = 0; i < mat -> oargs.nsargs; i++) { |
1030 |
if (!strcmp(mat -> oargs.sarg [i], VOIDID)) |
1031 |
continue; |
1032 |
|
1033 |
if ((mod = lastmod(obj, mat -> oargs.sarg [i])) == OVOID) { |
1034 |
sprintf(errmsg, "unknown modifier \"%s\"", mat -> oargs.sarg [i]); |
1035 |
objerror(mat, WARNING, errmsg); |
1036 |
continue; |
1037 |
} |
1038 |
|
1039 |
if (inset(modset, mod)) { |
1040 |
objerror(mat, WARNING, "duplicate modifier"); |
1041 |
continue; |
1042 |
} |
1043 |
|
1044 |
insertelem(modset, mod); |
1045 |
} |
1046 |
|
1047 |
mat -> os = (char*)modset; |
1048 |
} |
1049 |
|
1050 |
if (rayIn -> clipset != NULL) |
1051 |
setcopy(cset, rayIn -> clipset); |
1052 |
else cset [0] = 0; |
1053 |
|
1054 |
entering = rayIn -> rod > 0; |
1055 |
|
1056 |
/* Store photon incident from front if material defined as sensor */ |
1057 |
if (entering && inset(photonSensorSet, obj)) |
1058 |
addPhotons(rayIn); |
1059 |
|
1060 |
for (i = modset [0]; i > 0; i--) { |
1061 |
if (entering) { |
1062 |
if (!inset(cset, modset [i])) { |
1063 |
if (cset [0] >= MAXSET) |
1064 |
error(INTERNAL, "set overflow in clipPhotonScatter"); |
1065 |
insertelem(cset, modset [i]); |
1066 |
} |
1067 |
} |
1068 |
else if (inset(cset, modset [i])) |
1069 |
deletelem(cset, modset [i]); |
1070 |
} |
1071 |
|
1072 |
rayIn -> newcset = cset; |
1073 |
|
1074 |
if (strcmp(mat -> oargs.sarg [0], VOIDID)) { |
1075 |
for (rp = rayIn; rp -> parent != NULL; rp = rp -> parent) { |
1076 |
if ( !(rp -> rtype & RAYREFL) && rp->parent->ro != NULL && |
1077 |
inset(modset, rp -> parent -> ro -> omod)) { |
1078 |
|
1079 |
if (rp -> parent -> rod > 0) |
1080 |
inside++; |
1081 |
else inside--; |
1082 |
} |
1083 |
} |
1084 |
|
1085 |
if (inside > 0) { |
1086 |
flipsurface(rayIn); |
1087 |
mat = objptr(lastmod(obj, mat -> oargs.sarg [0])); |
1088 |
photonScatter [mat -> otype] (mat, rayIn); |
1089 |
return 0; |
1090 |
} |
1091 |
} |
1092 |
|
1093 |
/* Else transfer ray */ |
1094 |
photonRay(rayIn, &rayOut, PMAP_XFER, NULL); |
1095 |
tracePhoton(&rayOut); |
1096 |
|
1097 |
return 0; |
1098 |
} |
1099 |
|
1100 |
|
1101 |
|
1102 |
static int mirrorPhotonScatter (OBJREC *mat, RAY *rayIn) |
1103 |
/* Generate new photon ray for mirror material and recurse */ |
1104 |
{ |
1105 |
RAY rayOut; |
1106 |
int rpure = 1, i; |
1107 |
FVECT pnorm; |
1108 |
double pdot; |
1109 |
float albedo; |
1110 |
COLOR mcolor; |
1111 |
|
1112 |
/* check arguments */ |
1113 |
if (mat -> oargs.nfargs != 3 || mat -> oargs.nsargs > 1) |
1114 |
objerror(mat, USER, "bad number of arguments"); |
1115 |
|
1116 |
/* back is black */ |
1117 |
if (rayIn -> rod < 0) |
1118 |
return 0; |
1119 |
|
1120 |
/* get modifiers */ |
1121 |
raytexture(rayIn, mat -> omod); |
1122 |
|
1123 |
/* assign material color */ |
1124 |
copycolor(mcolor, mat -> oargs.farg); |
1125 |
multcolor(mcolor, rayIn -> pcol); |
1126 |
|
1127 |
/* Set up probabilities */ |
1128 |
albedo = colorAvg(mcolor); |
1129 |
|
1130 |
if (pmapRandom(rouletteState) > albedo) |
1131 |
/* Absorbed */ |
1132 |
return 0; |
1133 |
|
1134 |
/* compute reflected ray */ |
1135 |
photonRay(rayIn, &rayOut, PMAP_SPECREFL, mcolor); |
1136 |
|
1137 |
if (DOT(rayIn -> pert, rayIn -> pert) > sqr(FTINY)) { |
1138 |
/* use textures */ |
1139 |
pdot = raynormal(pnorm, rayIn); |
1140 |
|
1141 |
for (i = 0; i < 3; i++) |
1142 |
rayOut.rdir [i] = rayIn -> rdir [i] + 2 * pdot * pnorm [i]; |
1143 |
|
1144 |
rpure = 0; |
1145 |
} |
1146 |
|
1147 |
/* Check for penetration */ |
1148 |
if (rpure || DOT(rayOut.rdir, rayIn -> ron) <= FTINY) |
1149 |
for (i = 0; i < 3; i++) |
1150 |
rayOut.rdir [i] = rayIn -> rdir [i] + |
1151 |
2 * rayIn -> rod * rayIn -> ron [i]; |
1152 |
|
1153 |
tracePhoton(&rayOut); |
1154 |
return 0; |
1155 |
} |
1156 |
|
1157 |
|
1158 |
|
1159 |
static int mistPhotonScatter (OBJREC *mat, RAY *rayIn) |
1160 |
/* Generate new photon ray within mist and recurse */ |
1161 |
{ |
1162 |
COLOR mext; |
1163 |
RREAL re, ge, be; |
1164 |
RAY rayOut; |
1165 |
|
1166 |
/* check arguments */ |
1167 |
if (mat -> oargs.nfargs > 7) |
1168 |
objerror(mat, USER, "bad arguments"); |
1169 |
|
1170 |
if (mat -> oargs.nfargs > 2) { |
1171 |
/* compute extinction */ |
1172 |
copycolor(mext, mat -> oargs.farg); |
1173 |
/* get modifiers */ |
1174 |
raytexture(rayIn, mat -> omod); |
1175 |
multcolor(mext, rayIn -> pcol); |
1176 |
} |
1177 |
else setcolor(mext, 0, 0, 0); |
1178 |
|
1179 |
photonRay(rayIn, &rayOut, PMAP_XFER, NULL); |
1180 |
|
1181 |
if (rayIn -> rod > 0) { |
1182 |
/* entering ray */ |
1183 |
addcolor(rayOut.cext, mext); |
1184 |
|
1185 |
if (mat -> oargs.nfargs > 5) |
1186 |
copycolor(rayOut.albedo, mat -> oargs.farg + 3); |
1187 |
if (mat -> oargs.nfargs > 6) |
1188 |
rayOut.gecc = mat -> oargs.farg [6]; |
1189 |
} |
1190 |
|
1191 |
else { |
1192 |
/* leaving ray */ |
1193 |
re = max(rayIn -> cext [0] - mext [0], cextinction [0]); |
1194 |
ge = max(rayIn -> cext [1] - mext [1], cextinction [1]); |
1195 |
be = max(rayIn -> cext [2] - mext [2], cextinction [2]); |
1196 |
setcolor(rayOut.cext, re, ge, be); |
1197 |
|
1198 |
if (mat -> oargs.nfargs > 5) |
1199 |
copycolor(rayOut.albedo, salbedo); |
1200 |
if (mat -> oargs.nfargs > 6) |
1201 |
rayOut.gecc = seccg; |
1202 |
} |
1203 |
|
1204 |
tracePhoton(&rayOut); |
1205 |
|
1206 |
return 0; |
1207 |
} |
1208 |
|
1209 |
|
1210 |
|
1211 |
static int mx_dataPhotonScatter (OBJREC *mat, RAY *rayIn) |
1212 |
/* Pass photon on to materials selected by mixture data */ |
1213 |
{ |
1214 |
OBJECT obj; |
1215 |
double coef, pt [MAXDIM]; |
1216 |
DATARRAY *dp; |
1217 |
OBJECT mod [2]; |
1218 |
MFUNC *mf; |
1219 |
int i; |
1220 |
|
1221 |
if (mat -> oargs.nsargs < 6) |
1222 |
objerror(mat, USER, "bad # arguments"); |
1223 |
|
1224 |
obj = objndx(mat); |
1225 |
|
1226 |
for (i = 0; i < 2; i++) |
1227 |
if (!strcmp(mat -> oargs.sarg [i], VOIDID)) |
1228 |
mod [i] = OVOID; |
1229 |
else if ((mod [i] = lastmod(obj, mat -> oargs.sarg [i])) == OVOID) { |
1230 |
sprintf(errmsg, "undefined modifier \"%s\"", mat -> oargs.sarg [i]); |
1231 |
objerror(mat, USER, errmsg); |
1232 |
} |
1233 |
|
1234 |
dp = getdata(mat -> oargs.sarg [3]); |
1235 |
i = (1 << dp -> nd) - 1; |
1236 |
mf = getfunc(mat, 4, i << 5, 0); |
1237 |
setfunc(mat, rayIn); |
1238 |
errno = 0; |
1239 |
|
1240 |
for (i = 0; i < dp -> nd; i++) { |
1241 |
pt [i] = evalue(mf -> ep [i]); |
1242 |
|
1243 |
if (errno) { |
1244 |
objerror(mat, WARNING, "compute error"); |
1245 |
return 0; |
1246 |
} |
1247 |
} |
1248 |
|
1249 |
coef = datavalue(dp, pt); |
1250 |
errno = 0; |
1251 |
coef = funvalue(mat -> oargs.sarg [2], 1, &coef); |
1252 |
|
1253 |
if (errno) |
1254 |
objerror(mat, WARNING, "compute error"); |
1255 |
else { |
1256 |
OBJECT mxMod = mod [pmapRandom(rouletteState) < coef ? 0 : 1]; |
1257 |
|
1258 |
if (mxMod != OVOID) { |
1259 |
mat = objptr(mxMod); |
1260 |
photonScatter [mat -> otype] (mat, rayIn); |
1261 |
} |
1262 |
else { |
1263 |
/* Transfer ray if no modifier */ |
1264 |
RAY rayOut; |
1265 |
|
1266 |
photonRay(rayIn, &rayOut, PMAP_XFER, NULL); |
1267 |
tracePhoton(&rayOut); |
1268 |
} |
1269 |
} |
1270 |
|
1271 |
return 0; |
1272 |
} |
1273 |
|
1274 |
|
1275 |
|
1276 |
static int mx_pdataPhotonScatter (OBJREC *mat, RAY *rayIn) |
1277 |
/* Pass photon on to materials selected by mixture picture */ |
1278 |
{ |
1279 |
OBJECT obj; |
1280 |
double col [3], coef, pt [MAXDIM]; |
1281 |
DATARRAY *dp; |
1282 |
OBJECT mod [2]; |
1283 |
MFUNC *mf; |
1284 |
int i; |
1285 |
|
1286 |
if (mat -> oargs.nsargs < 7) |
1287 |
objerror(mat, USER, "bad # arguments"); |
1288 |
|
1289 |
obj = objndx(mat); |
1290 |
|
1291 |
for (i = 0; i < 2; i++) |
1292 |
if (!strcmp(mat -> oargs.sarg [i], VOIDID)) |
1293 |
mod [i] = OVOID; |
1294 |
else if ((mod [i] = lastmod(obj, mat -> oargs.sarg [i])) == OVOID) { |
1295 |
sprintf(errmsg, "undefined modifier \"%s\"", mat -> oargs.sarg [i]); |
1296 |
objerror(mat, USER, errmsg); |
1297 |
} |
1298 |
|
1299 |
dp = getpict(mat -> oargs.sarg [3]); |
1300 |
mf = getfunc(mat, 4, 0x3 << 5, 0); |
1301 |
setfunc(mat, rayIn); |
1302 |
errno = 0; |
1303 |
pt [1] = evalue(mf -> ep [0]); |
1304 |
pt [0] = evalue(mf -> ep [1]); |
1305 |
|
1306 |
if (errno) { |
1307 |
objerror(mat, WARNING, "compute error"); |
1308 |
return 0; |
1309 |
} |
1310 |
|
1311 |
for (i = 0; i < 3; i++) |
1312 |
col [i] = datavalue(dp + i, pt); |
1313 |
|
1314 |
errno = 0; |
1315 |
coef = funvalue(mat -> oargs.sarg [2], 3, col); |
1316 |
|
1317 |
if (errno) |
1318 |
objerror(mat, WARNING, "compute error"); |
1319 |
else { |
1320 |
OBJECT mxMod = mod [pmapRandom(rouletteState) < coef ? 0 : 1]; |
1321 |
|
1322 |
if (mxMod != OVOID) { |
1323 |
mat = objptr(mxMod); |
1324 |
photonScatter [mat -> otype] (mat, rayIn); |
1325 |
} |
1326 |
else { |
1327 |
/* Transfer ray if no modifier */ |
1328 |
RAY rayOut; |
1329 |
|
1330 |
photonRay(rayIn, &rayOut, PMAP_XFER, NULL); |
1331 |
tracePhoton(&rayOut); |
1332 |
} |
1333 |
} |
1334 |
|
1335 |
return 0; |
1336 |
} |
1337 |
|
1338 |
|
1339 |
|
1340 |
static int mx_funcPhotonScatter (OBJREC *mat, RAY *rayIn) |
1341 |
/* Pass photon on to materials selected by mixture function */ |
1342 |
{ |
1343 |
OBJECT obj, mod [2]; |
1344 |
int i; |
1345 |
double coef; |
1346 |
MFUNC *mf; |
1347 |
|
1348 |
if (mat -> oargs.nsargs < 4) |
1349 |
objerror(mat, USER, "bad # arguments"); |
1350 |
|
1351 |
obj = objndx(mat); |
1352 |
|
1353 |
for (i = 0; i < 2; i++) |
1354 |
if (!strcmp(mat -> oargs.sarg [i], VOIDID)) |
1355 |
mod [i] = OVOID; |
1356 |
else if ((mod [i] = lastmod(obj, mat -> oargs.sarg [i])) == OVOID) { |
1357 |
sprintf(errmsg, "undefined modifier \"%s\"", mat -> oargs.sarg [i]); |
1358 |
objerror(mat, USER, errmsg); |
1359 |
} |
1360 |
|
1361 |
mf = getfunc(mat, 3, 0x4, 0); |
1362 |
setfunc(mat, rayIn); |
1363 |
errno = 0; |
1364 |
|
1365 |
/* bound coefficient */ |
1366 |
coef = min(1, max(0, evalue(mf -> ep [0]))); |
1367 |
|
1368 |
if (errno) |
1369 |
objerror(mat, WARNING, "compute error"); |
1370 |
else { |
1371 |
OBJECT mxMod = mod [pmapRandom(rouletteState) < coef ? 0 : 1]; |
1372 |
|
1373 |
if (mxMod != OVOID) { |
1374 |
mat = objptr(mxMod); |
1375 |
photonScatter [mat -> otype] (mat, rayIn); |
1376 |
} |
1377 |
else { |
1378 |
/* Transfer ray if no modifier */ |
1379 |
RAY rayOut; |
1380 |
|
1381 |
photonRay(rayIn, &rayOut, PMAP_XFER, NULL); |
1382 |
tracePhoton(&rayOut); |
1383 |
} |
1384 |
} |
1385 |
|
1386 |
return 0; |
1387 |
} |
1388 |
|
1389 |
|
1390 |
|
1391 |
static int pattexPhotonScatter (OBJREC *mat, RAY *rayIn) |
1392 |
/* Generate new photon ray for pattern or texture modifier and recurse. |
1393 |
This code is brought to you by Henkel! :^) */ |
1394 |
{ |
1395 |
RAY rayOut; |
1396 |
|
1397 |
/* Get pattern */ |
1398 |
ofun [mat -> otype].funp(mat, rayIn); |
1399 |
if (mat -> omod != OVOID) { |
1400 |
/* Scatter using modifier (if any) */ |
1401 |
mat = objptr(mat -> omod); |
1402 |
photonScatter [mat -> otype] (mat, rayIn); |
1403 |
} |
1404 |
else { |
1405 |
/* Transfer ray if no modifier */ |
1406 |
photonRay(rayIn, &rayOut, PMAP_XFER, NULL); |
1407 |
tracePhoton(&rayOut); |
1408 |
} |
1409 |
|
1410 |
return 0; |
1411 |
} |
1412 |
|
1413 |
|
1414 |
|
1415 |
/* |
1416 |
================================================================== |
1417 |
The following code is |
1418 |
(c) Lucerne University of Applied Sciences and Arts, |
1419 |
supported by the Swiss National Science Foundation (SNSF, #147053) |
1420 |
================================================================== |
1421 |
*/ |
1422 |
|
1423 |
static int bsdfPhotonScatter (OBJREC *mat, RAY *rayIn) |
1424 |
/* Generate new photon ray for BSDF modifier and recurse. */ |
1425 |
{ |
1426 |
int hitFront; |
1427 |
SDError err; |
1428 |
SDValue bsdfVal; |
1429 |
FVECT upvec; |
1430 |
MFUNC *mf; |
1431 |
BSDFDAT nd; |
1432 |
RAY rayOut; |
1433 |
COLOR bsdfRGB; |
1434 |
int transmitted; |
1435 |
double prDiff, ptDiff, prDiffSD, ptDiffSD, prSpecSD, ptSpecSD, |
1436 |
albedo, xi; |
1437 |
const double patAlb = bright(rayIn -> pcol); |
1438 |
|
1439 |
/* Following code adapted from m_bsdf() */ |
1440 |
/* Check arguments */ |
1441 |
if (mat -> oargs.nsargs < 6 || mat -> oargs.nfargs > 9 || |
1442 |
mat -> oargs.nfargs % 3) |
1443 |
objerror(mat, USER, "bad # arguments"); |
1444 |
|
1445 |
hitFront = (rayIn -> rod > 0); |
1446 |
|
1447 |
/* Load cal file */ |
1448 |
mf = getfunc(mat, 5, 0x1d, 1); |
1449 |
|
1450 |
/* Get thickness */ |
1451 |
nd.thick = evalue(mf -> ep [0]); |
1452 |
if ((-FTINY <= nd.thick) & (nd.thick <= FTINY)) |
1453 |
nd.thick = .0; |
1454 |
|
1455 |
/* Get BSDF data */ |
1456 |
nd.sd = loadBSDF(mat -> oargs.sarg [1]); |
1457 |
|
1458 |
/* Extra diffuse reflectance from material def */ |
1459 |
if (hitFront) { |
1460 |
if (mat -> oargs.nfargs < 3) |
1461 |
setcolor(nd.rdiff, .0, .0, .0); |
1462 |
else setcolor(nd.rdiff, mat -> oargs.farg [0], mat -> oargs.farg [1], |
1463 |
mat -> oargs.farg [2]); |
1464 |
} |
1465 |
else if (mat -> oargs.nfargs < 6) { |
1466 |
/* Check for absorbing backside */ |
1467 |
if (!backvis && !nd.sd -> rb && !nd.sd -> tf) { |
1468 |
SDfreeCache(nd.sd); |
1469 |
return 0; |
1470 |
} |
1471 |
|
1472 |
setcolor(nd.rdiff, .0, .0, .0); |
1473 |
} |
1474 |
else setcolor(nd.rdiff, mat -> oargs.farg [3], mat -> oargs.farg [4], |
1475 |
mat -> oargs.farg [5]); |
1476 |
|
1477 |
/* Extra diffuse transmittance from material def */ |
1478 |
if (mat -> oargs.nfargs < 9) |
1479 |
setcolor(nd.tdiff, .0, .0, .0); |
1480 |
else setcolor(nd.tdiff, mat -> oargs.farg [6], mat -> oargs.farg [7], |
1481 |
mat -> oargs.farg [8]); |
1482 |
|
1483 |
nd.mp = mat; |
1484 |
nd.pr = rayIn; |
1485 |
|
1486 |
/* Get modifiers */ |
1487 |
raytexture(rayIn, mat -> omod); |
1488 |
|
1489 |
/* Modify diffuse values */ |
1490 |
multcolor(nd.rdiff, rayIn -> pcol); |
1491 |
multcolor(nd.tdiff, rayIn -> pcol); |
1492 |
|
1493 |
/* Get up vector & xform to world coords */ |
1494 |
upvec [0] = evalue(mf -> ep [1]); |
1495 |
upvec [1] = evalue(mf -> ep [2]); |
1496 |
upvec [2] = evalue(mf -> ep [3]); |
1497 |
|
1498 |
if (mf -> fxp != &unitxf) { |
1499 |
multv3(upvec, upvec, mf -> fxp -> xfm); |
1500 |
nd.thick *= mf -> fxp -> sca; |
1501 |
} |
1502 |
|
1503 |
if (rayIn -> rox) { |
1504 |
multv3(upvec, upvec, rayIn -> rox -> f.xfm); |
1505 |
nd.thick *= rayIn -> rox -> f.sca; |
1506 |
} |
1507 |
|
1508 |
/* Perturb normal */ |
1509 |
raynormal(nd.pnorm, rayIn); |
1510 |
|
1511 |
/* Xform incident dir to local BSDF coords */ |
1512 |
err = SDcompXform(nd.toloc, nd.pnorm, upvec); |
1513 |
|
1514 |
if (!err) { |
1515 |
nd.vray [0] = -rayIn -> rdir [0]; |
1516 |
nd.vray [1] = -rayIn -> rdir [1]; |
1517 |
nd.vray [2] = -rayIn -> rdir [2]; |
1518 |
err = SDmapDir(nd.vray, nd.toloc, nd.vray); |
1519 |
} |
1520 |
|
1521 |
if (!err) |
1522 |
err = SDinvXform(nd.fromloc, nd.toloc); |
1523 |
|
1524 |
if (err) { |
1525 |
objerror(mat, WARNING, "Illegal orientation vector"); |
1526 |
return 0; |
1527 |
} |
1528 |
|
1529 |
/* Determine BSDF resolution */ |
1530 |
err = SDsizeBSDF(nd.sr_vpsa, nd.vray, NULL, SDqueryMin + SDqueryMax, nd.sd); |
1531 |
|
1532 |
if (err) |
1533 |
objerror(mat, USER, transSDError(err)); |
1534 |
|
1535 |
nd.sr_vpsa [0] = sqrt(nd.sr_vpsa [0]); |
1536 |
nd.sr_vpsa [1] = sqrt(nd.sr_vpsa [1]); |
1537 |
|
1538 |
/* Orient perturbed normal towards incident side */ |
1539 |
if (!hitFront) { |
1540 |
nd.pnorm [0] = -nd.pnorm [0]; |
1541 |
nd.pnorm [1] = -nd.pnorm [1]; |
1542 |
nd.pnorm [2] = -nd.pnorm [2]; |
1543 |
} |
1544 |
|
1545 |
/* Get scatter probabilities (weighted by pattern except for spec refl) |
1546 |
* prDiff, ptDiff: extra diffuse component in material def |
1547 |
* prDiffSD, ptDiffSD: diffuse (constant) component in SDF |
1548 |
* prSpecSD, ptSpecSD: non-diffuse ("specular") component in SDF |
1549 |
* albedo: sum of above, inverse absorption probability */ |
1550 |
prDiff = colorAvg(nd.rdiff); |
1551 |
ptDiff = colorAvg(nd.tdiff); |
1552 |
prDiffSD = patAlb * SDdirectHemi(nd.vray, SDsampDf | SDsampR, nd.sd); |
1553 |
ptDiffSD = patAlb * SDdirectHemi(nd.vray, SDsampDf | SDsampT, nd.sd); |
1554 |
prSpecSD = SDdirectHemi(nd.vray, SDsampSp | SDsampR, nd.sd); |
1555 |
ptSpecSD = patAlb * SDdirectHemi(nd.vray, SDsampSp | SDsampT, nd.sd); |
1556 |
albedo = prDiff + ptDiff + prDiffSD + ptDiffSD + prSpecSD + ptSpecSD; |
1557 |
|
1558 |
/* |
1559 |
if (albedo > 1) |
1560 |
objerror(mat, WARNING, "Invalid albedo"); |
1561 |
*/ |
1562 |
|
1563 |
/* Insert direct and indirect photon hits if diffuse component */ |
1564 |
if (prDiff + ptDiff + prDiffSD + ptDiffSD > FTINY) |
1565 |
addPhotons(rayIn); |
1566 |
|
1567 |
xi = pmapRandom(rouletteState); |
1568 |
|
1569 |
if (xi > albedo) |
1570 |
/* Absorbtion */ |
1571 |
return 0; |
1572 |
|
1573 |
transmitted = 0; |
1574 |
|
1575 |
if ((xi -= prDiff) <= 0) { |
1576 |
/* Diffuse reflection (extra component in material def) */ |
1577 |
photonRay(rayIn, &rayOut, PMAP_DIFFREFL, nd.rdiff); |
1578 |
diffPhotonScatter(nd.pnorm, &rayOut); |
1579 |
} |
1580 |
|
1581 |
else if ((xi -= ptDiff) <= 0) { |
1582 |
/* Diffuse transmission (extra component in material def) */ |
1583 |
flipsurface(rayIn); |
1584 |
nd.thick = -nd.thick; |
1585 |
photonRay(rayIn, &rayOut, PMAP_DIFFTRANS, nd.tdiff); |
1586 |
diffPhotonScatter(nd.pnorm, &rayOut); |
1587 |
transmitted = 1; |
1588 |
} |
1589 |
|
1590 |
else { /* Sample SDF */ |
1591 |
if ((xi -= prDiffSD) <= 0) { |
1592 |
/* Diffuse SDF reflection (constant component) */ |
1593 |
if ((err = SDsampBSDF(&bsdfVal, nd.vray, pmapRandom(scatterState), |
1594 |
SDsampDf | SDsampR, nd.sd))) |
1595 |
objerror(mat, USER, transSDError(err)); |
1596 |
|
1597 |
/* Apply pattern to spectral component */ |
1598 |
ccy2rgb(&bsdfVal.spec, bsdfVal.cieY, bsdfRGB); |
1599 |
multcolor(bsdfRGB, rayIn -> pcol); |
1600 |
photonRay(rayIn, &rayOut, PMAP_DIFFREFL, bsdfRGB); |
1601 |
} |
1602 |
|
1603 |
else if ((xi -= ptDiffSD) <= 0) { |
1604 |
/* Diffuse SDF transmission (constant component) */ |
1605 |
if ((err = SDsampBSDF(&bsdfVal, nd.vray, pmapRandom(scatterState), |
1606 |
SDsampDf | SDsampT, nd.sd))) |
1607 |
objerror(mat, USER, transSDError(err)); |
1608 |
|
1609 |
/* Apply pattern to spectral component */ |
1610 |
ccy2rgb(&bsdfVal.spec, bsdfVal.cieY, bsdfRGB); |
1611 |
multcolor(bsdfRGB, rayIn -> pcol); |
1612 |
addcolor(bsdfRGB, nd.tdiff); |
1613 |
flipsurface(rayIn); /* Necessary? */ |
1614 |
nd.thick = -nd.thick; |
1615 |
photonRay(rayIn, &rayOut, PMAP_DIFFTRANS, bsdfRGB); |
1616 |
transmitted = 1; |
1617 |
} |
1618 |
|
1619 |
else if ((xi -= prSpecSD) <= 0) { |
1620 |
/* Non-diffuse ("specular") SDF reflection */ |
1621 |
if ((err = SDsampBSDF(&bsdfVal, nd.vray, pmapRandom(scatterState), |
1622 |
SDsampSp | SDsampR, nd.sd))) |
1623 |
objerror(mat, USER, transSDError(err)); |
1624 |
|
1625 |
ccy2rgb(&bsdfVal.spec, bsdfVal.cieY, bsdfRGB); |
1626 |
photonRay(rayIn, &rayOut, PMAP_SPECREFL, bsdfRGB); |
1627 |
} |
1628 |
|
1629 |
else { |
1630 |
/* Non-diffuse ("specular") SDF transmission */ |
1631 |
if ((err = SDsampBSDF(&bsdfVal, nd.vray, pmapRandom(scatterState), |
1632 |
SDsampSp | SDsampT, nd.sd))) |
1633 |
objerror(mat, USER, transSDError(err)); |
1634 |
|
1635 |
/* Apply pattern to spectral component */ |
1636 |
ccy2rgb(&bsdfVal.spec, bsdfVal.cieY, bsdfRGB); |
1637 |
multcolor(bsdfRGB, rayIn -> pcol); |
1638 |
flipsurface(rayIn); /* Necessary? */ |
1639 |
nd.thick = -nd.thick; |
1640 |
photonRay(rayIn, &rayOut, PMAP_SPECTRANS, bsdfRGB); |
1641 |
transmitted = 1; |
1642 |
} |
1643 |
|
1644 |
/* Xform outgoing dir to world coords */ |
1645 |
if ((err = SDmapDir(rayOut.rdir, nd.fromloc, nd.vray))) { |
1646 |
objerror(mat, USER, transSDError(err)); |
1647 |
return 0; |
1648 |
} |
1649 |
} |
1650 |
|
1651 |
/* Clean up */ |
1652 |
SDfreeCache(nd.sd); |
1653 |
|
1654 |
/* Need to offset ray origin to get past detail geometry? */ |
1655 |
if (transmitted && nd.thick != 0) |
1656 |
VSUM(rayOut.rorg, rayOut.rorg, rayIn -> ron, -nd.thick); |
1657 |
|
1658 |
tracePhoton(&rayOut); |
1659 |
return 0; |
1660 |
} |
1661 |
|
1662 |
|
1663 |
|
1664 |
static int lightPhotonScatter (OBJREC* mat, RAY* ray) |
1665 |
/* Light sources doan' reflect */ |
1666 |
{ |
1667 |
return 0; |
1668 |
} |
1669 |
|
1670 |
|
1671 |
|
1672 |
void initPhotonScatterFuncs () |
1673 |
/* Init photonScatter[] dispatch table */ |
1674 |
{ |
1675 |
int i; |
1676 |
|
1677 |
for (i = 0; i < NUMOTYPE; i++) |
1678 |
photonScatter [i] = o_default; |
1679 |
|
1680 |
photonScatter [MAT_LIGHT] = photonScatter [MAT_ILLUM] = |
1681 |
photonScatter [MAT_GLOW] = photonScatter [MAT_SPOT] = |
1682 |
lightPhotonScatter; |
1683 |
|
1684 |
photonScatter [MAT_PLASTIC] = photonScatter [MAT_METAL] = |
1685 |
photonScatter [MAT_TRANS] = normalPhotonScatter; |
1686 |
|
1687 |
photonScatter [MAT_PLASTIC2] = photonScatter [MAT_METAL2] = |
1688 |
photonScatter [MAT_TRANS2] = anisoPhotonScatter; |
1689 |
|
1690 |
photonScatter [MAT_DIELECTRIC] = photonScatter [MAT_INTERFACE] = |
1691 |
dielectricPhotonScatter; |
1692 |
|
1693 |
photonScatter [MAT_MIST] = mistPhotonScatter; |
1694 |
photonScatter [MAT_GLASS] = glassPhotonScatter; |
1695 |
photonScatter [MAT_CLIP] = clipPhotonScatter; |
1696 |
photonScatter [MAT_MIRROR] = mirrorPhotonScatter; |
1697 |
photonScatter [MIX_FUNC] = mx_funcPhotonScatter; |
1698 |
photonScatter [MIX_DATA] = mx_dataPhotonScatter; |
1699 |
photonScatter [MIX_PICT]= mx_pdataPhotonScatter; |
1700 |
|
1701 |
photonScatter [PAT_BDATA] = photonScatter [PAT_CDATA] = |
1702 |
photonScatter [PAT_BFUNC] = photonScatter [PAT_CFUNC] = |
1703 |
photonScatter [PAT_CPICT] = photonScatter [TEX_FUNC] = |
1704 |
photonScatter [TEX_DATA] = pattexPhotonScatter; |
1705 |
|
1706 |
photonScatter [MOD_ALIAS] = aliasPhotonScatter; |
1707 |
photonScatter [MAT_BSDF] = bsdfPhotonScatter; |
1708 |
} |