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#ifndef lint |
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static const char RCSid[] = "$Id: pmapmat.c,v 4.16 2015/11/13 17:47:00 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" |
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#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 |
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#define SP_FLAT 010 |
35 |
#define SP_BADU 040 |
36 |
#define MLAMBDA 500 |
37 |
#define RINDEX 1.52 |
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#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; |
46 |
COLOR mcolor, scolor; |
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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; |
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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 |
|
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|
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|
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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}; |
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|
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. |
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* It is preserved for transferred rays (of type PMAP_XFER). |
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* 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 |
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* 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 |
if (rayIn) { |
110 |
/* Transfer flux */ |
111 |
copycolor(rayOut -> rcol, rayIn -> rcol); |
112 |
|
113 |
/* Copy caustic flag & direction for transferred rays */ |
114 |
if (rayOutType == PMAP_XFER) { |
115 |
/* rayOut -> rtype |= rayIn -> rtype & SPECULAR; */ |
116 |
rayOut -> rtype |= rayIn -> rtype; |
117 |
VCOPY(rayOut -> rdir, rayIn -> rdir); |
118 |
} |
119 |
else if (fluxAtten) { |
120 |
/* Attenuate and normalise flux for scattered rays */ |
121 |
multcolor(rayOut -> rcol, fluxAtten); |
122 |
colorNorm(rayOut -> rcol); |
123 |
} |
124 |
|
125 |
/* Propagate index of emitting light source */ |
126 |
rayOut -> rsrc = rayIn -> rsrc; |
127 |
} |
128 |
} |
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|
130 |
|
131 |
|
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static void addPhotons (const RAY *r) |
133 |
/* Insert photon hits, where applicable */ |
134 |
{ |
135 |
if (!r -> rlvl) |
136 |
/* Add direct photon map at primary hitpoint */ |
137 |
newPhoton(directPmap, r); |
138 |
else { |
139 |
/* Add global or precomputed photon map at indirect hitpoint */ |
140 |
newPhoton(preCompPmap ? preCompPmap : globalPmap, r); |
141 |
|
142 |
/* Store caustic photon if specular flag set */ |
143 |
if (PMAP_CAUSTICRAY(r)) |
144 |
newPhoton(causticPmap, r); |
145 |
|
146 |
/* Store in contribution photon map */ |
147 |
newPhoton(contribPmap, r); |
148 |
} |
149 |
} |
150 |
|
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|
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|
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void getPhotonSensors (char **sensorList) |
154 |
/* Find antimatter geometry declared as photon sensors */ |
155 |
{ |
156 |
OBJECT i; |
157 |
OBJREC *obj; |
158 |
char **lp; |
159 |
|
160 |
/* Init sensor set */ |
161 |
photonSensorSet [0] = 0; |
162 |
|
163 |
if (!sensorList [0]) |
164 |
return; |
165 |
|
166 |
for (i = 0; i < nobjects; i++) { |
167 |
obj = objptr(i); |
168 |
|
169 |
/* Insert object in sensor set if it's in the specified sensor list |
170 |
* and of type antimatter */ |
171 |
for (lp = sensorList; *lp; lp++) { |
172 |
if (!strcmp(obj -> oname, *lp)) { |
173 |
if (obj -> otype != MAT_CLIP) { |
174 |
sprintf(errmsg, "photon sensor modifier %s is not antimatter", |
175 |
obj -> oname); |
176 |
error(USER, errmsg); |
177 |
} |
178 |
|
179 |
if (photonSensorSet [0] >= AMBLLEN) |
180 |
error(USER, "too many photon sensor modifiers"); |
181 |
|
182 |
insertelem(photonSensorSet, i); |
183 |
} |
184 |
} |
185 |
} |
186 |
|
187 |
if (!photonSensorSet [0]) |
188 |
error(USER, "no photon sensors found"); |
189 |
} |
190 |
|
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|
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|
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/* ================ Material specific scattering routines ================ */ |
194 |
|
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|
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static int isoSpecPhotonScatter (NORMDAT *nd, RAY *rayOut) |
197 |
/* Generate direction for isotropically specularly reflected |
198 |
or transmitted ray. Returns 1 if successful. */ |
199 |
{ |
200 |
FVECT u, v, h; |
201 |
RAY *rayIn = nd -> rp; |
202 |
double d, d2, sinp, cosp; |
203 |
int niter, i = 0; |
204 |
|
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/* Set up sample coordinates */ |
206 |
getperpendicular(u, nd -> pnorm, 1); |
207 |
fcross(v, nd -> pnorm, u); |
208 |
|
209 |
if (nd -> specfl & SP_REFL) { |
210 |
/* Specular reflection; make MAXITER attempts at getting a ray */ |
211 |
|
212 |
for (niter = 0; niter < MAXITER; niter++) { |
213 |
d = 2 * PI * pmapRandom(scatterState); |
214 |
cosp = cos(d); |
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sinp = sin(d); |
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d2 = pmapRandom(scatterState); |
217 |
d = d2 <= FTINY ? 1 : sqrt(nd -> alpha2 * -log(d2)); |
218 |
|
219 |
for (i = 0; i < 3; i++) |
220 |
h [i] = nd -> pnorm [i] + d * (cosp * u [i] + sinp * v [i]); |
221 |
|
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d = -2 * DOT(h, rayIn -> rdir) / (1 + d * d); |
223 |
VSUM(rayOut -> rdir, rayIn -> rdir, h, d); |
224 |
|
225 |
if (DOT(rayOut -> rdir, rayIn -> ron) > FTINY) |
226 |
return 1; |
227 |
} |
228 |
|
229 |
return 0; |
230 |
} |
231 |
|
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else { |
233 |
/* Specular transmission; make MAXITER attempts at getting a ray */ |
234 |
|
235 |
for (niter = 0; niter < MAXITER; niter++) { |
236 |
d = 2 * PI * pmapRandom(scatterState); |
237 |
cosp = cos(d); |
238 |
sinp = sin(d); |
239 |
d2 = pmapRandom(scatterState); |
240 |
d = d2 <= FTINY ? 1 : sqrt(-log(d2) * nd -> alpha2); |
241 |
|
242 |
for (i = 0; i < 3; i++) |
243 |
rayOut -> rdir [i] = nd -> prdir [i] + |
244 |
d * (cosp * u [i] + sinp * v [i]); |
245 |
|
246 |
if (DOT(rayOut -> rdir, rayIn -> ron) < -FTINY) { |
247 |
normalize(rayOut -> rdir); |
248 |
return 1; |
249 |
} |
250 |
} |
251 |
|
252 |
return 0; |
253 |
} |
254 |
} |
255 |
|
256 |
|
257 |
|
258 |
static void diffPhotonScatter (FVECT normal, RAY* rayOut) |
259 |
/* Generate cosine-weighted direction for diffuse ray */ |
260 |
{ |
261 |
const RREAL cosThetaSqr = pmapRandom(scatterState), |
262 |
cosTheta = sqrt(cosThetaSqr), |
263 |
sinTheta = sqrt(1 - cosThetaSqr), |
264 |
phi = 2 * PI * pmapRandom(scatterState), |
265 |
du = cos(phi) * sinTheta, dv = sin(phi) * sinTheta; |
266 |
FVECT u, v; |
267 |
int i = 0; |
268 |
|
269 |
/* Set up sample coordinates */ |
270 |
getperpendicular(u, normal, 1); |
271 |
fcross(v, normal, u); |
272 |
|
273 |
/* Convert theta & phi to cartesian */ |
274 |
for (i = 0; i < 3; i++) |
275 |
rayOut -> rdir [i] = du * u [i] + dv * v [i] + cosTheta * normal [i]; |
276 |
|
277 |
normalize(rayOut -> rdir); |
278 |
} |
279 |
|
280 |
|
281 |
|
282 |
static int normalPhotonScatter (OBJREC *mat, RAY *rayIn) |
283 |
/* Generate new photon ray for isotropic material and recurse */ |
284 |
{ |
285 |
NORMDAT nd; |
286 |
int i, hastexture; |
287 |
float xi, albedo, prdiff, ptdiff, prspec, ptspec; |
288 |
double d, fresnel; |
289 |
RAY rayOut; |
290 |
|
291 |
if (mat -> oargs.nfargs != (mat -> otype == MAT_TRANS ? 7 : 5)) |
292 |
objerror(mat, USER, "bad number of arguments"); |
293 |
|
294 |
/* Check for back side; reorient if back is visible */ |
295 |
if (rayIn -> rod < 0) |
296 |
if (!backvis && mat -> otype != MAT_TRANS) |
297 |
return 0; |
298 |
else { |
299 |
/* Get modifiers */ |
300 |
raytexture(rayIn, mat -> omod); |
301 |
flipsurface(rayIn); |
302 |
} |
303 |
else raytexture(rayIn, mat -> omod); |
304 |
|
305 |
nd.rp = rayIn; |
306 |
|
307 |
/* Get material color */ |
308 |
copycolor(nd.mcolor, mat -> oargs.farg); |
309 |
|
310 |
/* Get roughness */ |
311 |
nd.specfl = 0; |
312 |
nd.alpha2 = mat -> oargs.farg [4]; |
313 |
|
314 |
if ((nd.alpha2 *= nd.alpha2) <= FTINY) |
315 |
nd.specfl |= SP_PURE; |
316 |
|
317 |
if (rayIn -> ro != NULL && isflat(rayIn -> ro -> otype)) |
318 |
nd.specfl |= SP_FLAT; |
319 |
|
320 |
/* Perturb normal */ |
321 |
if ((hastexture = (DOT(rayIn -> pert, rayIn -> pert) > sqr(FTINY)) )) |
322 |
nd.pdot = raynormal(nd.pnorm, rayIn); |
323 |
else { |
324 |
VCOPY(nd.pnorm, rayIn -> ron); |
325 |
nd.pdot = rayIn -> rod; |
326 |
} |
327 |
|
328 |
nd.pdot = max(nd.pdot, .001); |
329 |
|
330 |
/* Modify material color */ |
331 |
multcolor(nd.mcolor, rayIn -> pcol); |
332 |
nd.rspec = mat -> oargs.farg [3]; |
333 |
|
334 |
/* Approximate Fresnel term */ |
335 |
if (nd.specfl & SP_PURE && nd.rspec > FTINY) { |
336 |
fresnel = FRESNE(rayIn -> rod); |
337 |
nd.rspec += fresnel * (1 - nd.rspec); |
338 |
} |
339 |
else fresnel = 0; |
340 |
|
341 |
/* Transmission params */ |
342 |
if (mat -> otype == MAT_TRANS) { |
343 |
nd.trans = mat -> oargs.farg [5] * (1 - nd.rspec); |
344 |
nd.tspec = nd.trans * mat -> oargs.farg [6]; |
345 |
nd.tdiff = nd.trans - nd.tspec; |
346 |
} |
347 |
else nd.tdiff = nd.tspec = nd.trans = 0; |
348 |
|
349 |
/* Specular reflection params */ |
350 |
if (nd.rspec > FTINY) { |
351 |
/* Specular color */ |
352 |
if (mat -> otype != MAT_METAL) |
353 |
setcolor(nd.scolor, nd.rspec, nd.rspec, nd.rspec); |
354 |
else if (fresnel > FTINY) { |
355 |
d = nd.rspec * (1 - fresnel); |
356 |
for (i = 0; i < 3; i++) |
357 |
nd.scolor [i] = fresnel + nd.mcolor [i] * d; |
358 |
} |
359 |
else { |
360 |
copycolor(nd.scolor, nd.mcolor); |
361 |
scalecolor(nd.scolor, nd.rspec); |
362 |
} |
363 |
} |
364 |
else setcolor(nd.scolor, 0, 0, 0); |
365 |
|
366 |
/* Diffuse reflection params */ |
367 |
nd.rdiff = 1 - nd.trans - nd.rspec; |
368 |
|
369 |
/* Set up probabilities */ |
370 |
prdiff = ptdiff = ptspec = colorAvg(nd.mcolor); |
371 |
prdiff *= nd.rdiff; |
372 |
ptdiff *= nd.tdiff; |
373 |
prspec = colorAvg(nd.scolor); |
374 |
ptspec *= nd.tspec; |
375 |
albedo = prdiff + ptdiff + prspec + ptspec; |
376 |
|
377 |
/* Insert direct and indirect photon hits if diffuse component */ |
378 |
if (prdiff > FTINY || ptdiff > FTINY) |
379 |
addPhotons(rayIn); |
380 |
|
381 |
xi = pmapRandom(rouletteState); |
382 |
|
383 |
if (xi > albedo) |
384 |
/* Absorbed */ |
385 |
return 0; |
386 |
|
387 |
if (xi > (albedo -= prspec)) { |
388 |
/* Specular reflection */ |
389 |
nd.specfl |= SP_REFL; |
390 |
|
391 |
if (nd.specfl & SP_PURE) { |
392 |
/* Perfect specular reflection */ |
393 |
for (i = 0; i < 3; i++) { |
394 |
/* Reflected ray */ |
395 |
nd.vrefl [i] = rayIn -> rdir [i] + 2 * nd.pdot * nd.pnorm [i]; |
396 |
} |
397 |
|
398 |
/* Penetration? */ |
399 |
if (hastexture && DOT(nd.vrefl, rayIn -> ron) <= FTINY) |
400 |
for (i = 0; i < 3; i++) { |
401 |
/* Safety measure */ |
402 |
nd.vrefl [i] = rayIn -> rdir [i] + |
403 |
2 * rayIn -> rod * rayIn -> ron [i]; |
404 |
} |
405 |
|
406 |
VCOPY(rayOut.rdir, nd.vrefl); |
407 |
} |
408 |
|
409 |
else if (!isoSpecPhotonScatter(&nd, &rayOut)) |
410 |
return 0; |
411 |
|
412 |
photonRay(rayIn, &rayOut, PMAP_SPECREFL, nd.scolor); |
413 |
} |
414 |
|
415 |
else if (xi > (albedo -= ptspec)) { |
416 |
/* Specular transmission */ |
417 |
nd.specfl |= SP_TRAN; |
418 |
|
419 |
if (hastexture) { |
420 |
/* Perturb */ |
421 |
for (i = 0; i < 3; i++) |
422 |
nd.prdir [i] = rayIn -> rdir [i] - rayIn -> pert [i]; |
423 |
|
424 |
if (DOT(nd.prdir, rayIn -> ron) < -FTINY) |
425 |
normalize(nd.prdir); |
426 |
else VCOPY(nd.prdir, rayIn -> rdir); |
427 |
} |
428 |
else VCOPY(nd.prdir, rayIn -> rdir); |
429 |
|
430 |
if ((nd.specfl & (SP_TRAN | SP_PURE)) == (SP_TRAN | SP_PURE)) |
431 |
/* Perfect specular transmission */ |
432 |
VCOPY(rayOut.rdir, nd.prdir); |
433 |
else if (!isoSpecPhotonScatter(&nd, &rayOut)) |
434 |
return 0; |
435 |
|
436 |
photonRay(rayIn, &rayOut, PMAP_SPECTRANS, nd.mcolor); |
437 |
} |
438 |
|
439 |
else if (xi > (albedo -= prdiff)) { |
440 |
/* Diffuse reflection */ |
441 |
photonRay(rayIn, &rayOut, PMAP_DIFFREFL, nd.mcolor); |
442 |
diffPhotonScatter(hastexture ? nd.pnorm : rayIn -> ron, &rayOut); |
443 |
} |
444 |
|
445 |
else { |
446 |
/* Diffuse transmission */ |
447 |
flipsurface(rayIn); |
448 |
photonRay(rayIn, &rayOut, PMAP_DIFFTRANS, nd.mcolor); |
449 |
|
450 |
if (hastexture) { |
451 |
FVECT bnorm; |
452 |
bnorm [0] = -nd.pnorm [0]; |
453 |
bnorm [1] = -nd.pnorm [1]; |
454 |
bnorm [2] = -nd.pnorm [2]; |
455 |
diffPhotonScatter(bnorm, &rayOut); |
456 |
} |
457 |
else diffPhotonScatter(rayIn -> ron, &rayOut); |
458 |
} |
459 |
|
460 |
tracePhoton(&rayOut); |
461 |
return 0; |
462 |
} |
463 |
|
464 |
|
465 |
|
466 |
static void getacoords (ANISODAT *np) |
467 |
/* Set up coordinate system for anisotropic sampling; cloned from aniso.c */ |
468 |
{ |
469 |
MFUNC *mf; |
470 |
int i; |
471 |
|
472 |
mf = getfunc(np->mp, 3, 0x7, 1); |
473 |
setfunc(np->mp, np->rp); |
474 |
errno = 0; |
475 |
|
476 |
for (i = 0; i < 3; i++) |
477 |
np->u[i] = evalue(mf->ep[i]); |
478 |
|
479 |
if ((errno == EDOM) | (errno == ERANGE)) { |
480 |
objerror(np->mp, WARNING, "compute error"); |
481 |
np->specfl |= SP_BADU; |
482 |
return; |
483 |
} |
484 |
|
485 |
if (mf->fxp != &unitxf) |
486 |
multv3(np->u, np->u, mf->fxp->xfm); |
487 |
|
488 |
fcross(np->v, np->pnorm, np->u); |
489 |
|
490 |
if (normalize(np->v) == 0.0) { |
491 |
objerror(np->mp, WARNING, "illegal orientation vector"); |
492 |
np->specfl |= SP_BADU; |
493 |
return; |
494 |
} |
495 |
|
496 |
fcross(np->u, np->v, np->pnorm); |
497 |
} |
498 |
|
499 |
|
500 |
|
501 |
static int anisoSpecPhotonScatter (ANISODAT *nd, RAY *rayOut) |
502 |
/* Generate direction for anisotropically specularly reflected |
503 |
or transmitted ray. Returns 1 if successful. */ |
504 |
{ |
505 |
FVECT h; |
506 |
double d, d2, sinp, cosp; |
507 |
int niter, i; |
508 |
RAY *rayIn = nd -> rp; |
509 |
|
510 |
if (rayIn -> ro != NULL && isflat(rayIn -> ro -> otype)) |
511 |
nd -> specfl |= SP_FLAT; |
512 |
|
513 |
/* set up coordinates */ |
514 |
getacoords(nd); |
515 |
|
516 |
if (rayOut -> rtype & TRANS) { |
517 |
/* Specular transmission */ |
518 |
|
519 |
if (DOT(rayIn -> pert, rayIn -> pert) <= FTINY * FTINY) |
520 |
VCOPY(nd -> prdir, rayIn -> rdir); |
521 |
else { |
522 |
/* perturb */ |
523 |
for (i = 0; i < 3; i++) |
524 |
nd -> prdir [i] = rayIn -> rdir [i] - rayIn -> pert [i]; |
525 |
|
526 |
if (DOT(nd -> prdir, rayIn -> ron) < -FTINY) |
527 |
normalize(nd -> prdir); |
528 |
else VCOPY(nd -> prdir, rayIn -> rdir); |
529 |
} |
530 |
|
531 |
/* Make MAXITER attempts at getting a ray */ |
532 |
for (niter = 0; niter < MAXITER; niter++) { |
533 |
d = 2 * PI * pmapRandom(scatterState); |
534 |
cosp = cos(d) * nd -> u_alpha; |
535 |
sinp = sin(d) * nd -> v_alpha; |
536 |
d = sqrt(sqr(cosp) + sqr(sinp)); |
537 |
cosp /= d; |
538 |
sinp /= d; |
539 |
d2 = pmapRandom(scatterState); |
540 |
d = d2 <= FTINY ? 1 |
541 |
: sqrt(-log(d2) / |
542 |
(sqr(cosp) / sqr(nd -> u_alpha) + |
543 |
sqr(sinp) / (nd -> v_alpha * nd -> u_alpha))); |
544 |
|
545 |
for (i = 0; i < 3; i++) |
546 |
rayOut -> rdir [i] = nd -> prdir [i] + d * |
547 |
(cosp * nd -> u [i] + sinp * nd -> v [i]); |
548 |
|
549 |
if (DOT(rayOut -> rdir, rayIn -> ron) < -FTINY) { |
550 |
normalize(rayOut -> rdir); |
551 |
return 1; |
552 |
} |
553 |
} |
554 |
|
555 |
return 0; |
556 |
} |
557 |
|
558 |
else { |
559 |
/* Specular reflection */ |
560 |
|
561 |
/* Make MAXITER attempts at getting a ray */ |
562 |
for (niter = 0; niter < MAXITER; niter++) { |
563 |
d = 2 * PI * pmapRandom(scatterState); |
564 |
cosp = cos(d) * nd -> u_alpha; |
565 |
sinp = sin(d) * nd -> v_alpha; |
566 |
d = sqrt(sqr(cosp) + sqr(sinp)); |
567 |
cosp /= d; |
568 |
sinp /= d; |
569 |
d2 = pmapRandom(scatterState); |
570 |
d = d2 <= FTINY ? 1 |
571 |
: sqrt(-log(d2) / |
572 |
(sqr(cosp) / sqr(nd -> u_alpha) + |
573 |
sqr(sinp) / (nd -> v_alpha * nd -> v_alpha))); |
574 |
|
575 |
for (i = 0; i < 3; i++) |
576 |
h [i] = nd -> pnorm [i] + |
577 |
d * (cosp * nd -> u [i] + sinp * nd -> v [i]); |
578 |
|
579 |
d = -2 * DOT(h, rayIn -> rdir) / (1 + d * d); |
580 |
VSUM(rayOut -> rdir, rayIn -> rdir, h, d); |
581 |
|
582 |
if (DOT(rayOut -> rdir, rayIn -> ron) > FTINY) |
583 |
return 1; |
584 |
} |
585 |
|
586 |
return 0; |
587 |
} |
588 |
} |
589 |
|
590 |
|
591 |
|
592 |
static int anisoPhotonScatter (OBJREC *mat, RAY *rayIn) |
593 |
/* Generate new photon ray for anisotropic material and recurse */ |
594 |
{ |
595 |
ANISODAT nd; |
596 |
float xi, albedo, prdiff, ptdiff, prspec, ptspec; |
597 |
RAY rayOut; |
598 |
|
599 |
if (mat -> oargs.nfargs != (mat -> otype == MAT_TRANS2 ? 8 : 6)) |
600 |
objerror(mat, USER, "bad number of real arguments"); |
601 |
|
602 |
nd.rp = rayIn; |
603 |
nd.mp = objptr(rayIn -> ro -> omod); |
604 |
|
605 |
/* get material color */ |
606 |
copycolor(nd.mcolor, mat -> oargs.farg); |
607 |
|
608 |
/* get roughness */ |
609 |
nd.specfl = 0; |
610 |
nd.u_alpha = mat -> oargs.farg [4]; |
611 |
nd.v_alpha = mat -> oargs.farg [5]; |
612 |
if (nd.u_alpha < FTINY || nd.v_alpha <= FTINY) |
613 |
objerror(mat, USER, "roughness too small"); |
614 |
|
615 |
/* check for back side; reorient if back is visible */ |
616 |
if (rayIn -> rod < 0) |
617 |
if (!backvis && mat -> otype != MAT_TRANS2) |
618 |
return 0; |
619 |
else { |
620 |
/* get modifiers */ |
621 |
raytexture(rayIn, mat -> omod); |
622 |
flipsurface(rayIn); |
623 |
} |
624 |
else raytexture(rayIn, mat -> omod); |
625 |
|
626 |
/* perturb normal */ |
627 |
nd.pdot = max(raynormal(nd.pnorm, rayIn), .001); |
628 |
|
629 |
/* modify material color */ |
630 |
multcolor(nd.mcolor, rayIn -> pcol); |
631 |
nd.rspec = mat -> oargs.farg [3]; |
632 |
|
633 |
/* transmission params */ |
634 |
if (mat -> otype == MAT_TRANS2) { |
635 |
nd.trans = mat -> oargs.farg [6] * (1 - nd.rspec); |
636 |
nd.tspec = nd.trans * mat -> oargs.farg [7]; |
637 |
nd.tdiff = nd.trans - nd.tspec; |
638 |
if (nd.tspec > FTINY) |
639 |
nd.specfl |= SP_TRAN; |
640 |
} |
641 |
else nd.tdiff = nd.tspec = nd.trans = 0; |
642 |
|
643 |
/* specular reflection params */ |
644 |
if (nd.rspec > FTINY) { |
645 |
nd.specfl |= SP_REFL; |
646 |
|
647 |
/* comput e specular color */ |
648 |
if (mat -> otype == MAT_METAL2) |
649 |
copycolor(nd.scolor, nd.mcolor); |
650 |
else setcolor(nd.scolor, 1, 1, 1); |
651 |
|
652 |
scalecolor(nd.scolor, nd.rspec); |
653 |
} |
654 |
else setcolor(nd.scolor, 0, 0, 0); |
655 |
|
656 |
/* diffuse reflection params */ |
657 |
nd.rdiff = 1 - nd.trans - nd.rspec; |
658 |
|
659 |
/* Set up probabilities */ |
660 |
prdiff = ptdiff = ptspec = colorAvg(nd.mcolor); |
661 |
prdiff *= nd.rdiff; |
662 |
ptdiff *= nd.tdiff; |
663 |
prspec = colorAvg(nd.scolor); |
664 |
ptspec *= nd.tspec; |
665 |
albedo = prdiff + ptdiff + prspec + ptspec; |
666 |
|
667 |
/* Insert direct and indirect photon hits if diffuse component */ |
668 |
if (prdiff > FTINY || ptdiff > FTINY) |
669 |
addPhotons(rayIn); |
670 |
|
671 |
xi = pmapRandom(rouletteState); |
672 |
|
673 |
if (xi > albedo) |
674 |
/* Absorbed */ |
675 |
return 0; |
676 |
|
677 |
if (xi > (albedo -= prspec)) |
678 |
/* Specular reflection */ |
679 |
if (!(nd.specfl & SP_BADU)) { |
680 |
photonRay(rayIn, &rayOut, PMAP_SPECREFL, nd.scolor); |
681 |
|
682 |
if (!anisoSpecPhotonScatter(&nd, &rayOut)) |
683 |
return 0; |
684 |
} |
685 |
else return 0; |
686 |
|
687 |
else if (xi > (albedo -= ptspec)) |
688 |
/* Specular transmission */ |
689 |
|
690 |
if (!(nd.specfl & SP_BADU)) { |
691 |
/* Specular transmission */ |
692 |
photonRay(rayIn, &rayOut, PMAP_SPECTRANS, nd.mcolor); |
693 |
|
694 |
if (!anisoSpecPhotonScatter(&nd, &rayOut)) |
695 |
return 0; |
696 |
} |
697 |
else return 0; |
698 |
|
699 |
else if (xi > (albedo -= prdiff)) { |
700 |
/* Diffuse reflection */ |
701 |
photonRay(rayIn, &rayOut, PMAP_DIFFREFL, nd.mcolor); |
702 |
diffPhotonScatter(nd.pnorm, &rayOut); |
703 |
} |
704 |
|
705 |
else { |
706 |
/* Diffuse transmission */ |
707 |
FVECT bnorm; |
708 |
flipsurface(rayIn); |
709 |
bnorm [0] = -nd.pnorm [0]; |
710 |
bnorm [1] = -nd.pnorm [1]; |
711 |
bnorm [2] = -nd.pnorm [2]; |
712 |
|
713 |
photonRay(rayIn, &rayOut, PMAP_DIFFTRANS, nd.mcolor); |
714 |
diffPhotonScatter(bnorm, &rayOut); |
715 |
} |
716 |
|
717 |
tracePhoton(&rayOut); |
718 |
return 0; |
719 |
} |
720 |
|
721 |
|
722 |
static double mylog (double x) |
723 |
/* special log for extinction coefficients; cloned from dielectric.c */ |
724 |
{ |
725 |
if (x < 1e-40) |
726 |
return(-100.); |
727 |
|
728 |
if (x >= 1.) |
729 |
return(0.); |
730 |
|
731 |
return(log(x)); |
732 |
} |
733 |
|
734 |
|
735 |
static int dielectricPhotonScatter (OBJREC *mat, RAY *rayIn) |
736 |
/* Generate new photon ray for dielectric material and recurse */ |
737 |
{ |
738 |
double cos1, cos2, nratio, d1, d2, refl; |
739 |
COLOR ctrans, talb; |
740 |
FVECT dnorm; |
741 |
int hastexture, i; |
742 |
RAY rayOut; |
743 |
|
744 |
if (mat -> oargs.nfargs != (mat -> otype == MAT_DIELECTRIC ? 5 : 8)) |
745 |
objerror(mat, USER, "bad arguments"); |
746 |
|
747 |
/* get modifiers */ |
748 |
raytexture(rayIn, mat -> omod); |
749 |
|
750 |
if ((hastexture = (DOT(rayIn -> pert, rayIn -> pert) > FTINY * FTINY))) |
751 |
/* Perturb normal */ |
752 |
cos1 = raynormal(dnorm, rayIn); |
753 |
else { |
754 |
VCOPY(dnorm, rayIn -> ron); |
755 |
cos1 = rayIn -> rod; |
756 |
} |
757 |
|
758 |
/* index of refraction */ |
759 |
nratio = mat -> otype == |
760 |
MAT_DIELECTRIC ? mat -> oargs.farg [3] + mat -> oargs.farg [4] / MLAMBDA |
761 |
: mat -> oargs.farg [3] / mat -> oargs.farg [7]; |
762 |
|
763 |
if (cos1 < 0) { |
764 |
/* inside */ |
765 |
hastexture = -hastexture; |
766 |
cos1 = -cos1; |
767 |
dnorm [0] = -dnorm [0]; |
768 |
dnorm [1] = -dnorm [1]; |
769 |
dnorm [2] = -dnorm [2]; |
770 |
setcolor(rayIn -> cext, |
771 |
-mylog(mat -> oargs.farg [0] * rayIn -> pcol [0]), |
772 |
-mylog(mat -> oargs.farg [1] * rayIn -> pcol [1]), |
773 |
-mylog(mat -> oargs.farg [2] * rayIn -> pcol [2])); |
774 |
setcolor(rayIn -> albedo, 0, 0, 0); |
775 |
rayIn -> gecc = 0; |
776 |
|
777 |
if (mat -> otype == MAT_INTERFACE) { |
778 |
setcolor(ctrans, |
779 |
-mylog(mat -> oargs.farg [4] * rayIn -> pcol [0]), |
780 |
-mylog(mat -> oargs.farg [5] * rayIn -> pcol [1]), |
781 |
-mylog(mat -> oargs.farg [6] * rayIn -> pcol [2])); |
782 |
setcolor(talb, 0, 0, 0); |
783 |
} |
784 |
else { |
785 |
copycolor(ctrans, cextinction); |
786 |
copycolor(talb, salbedo); |
787 |
} |
788 |
} |
789 |
|
790 |
else { |
791 |
/* outside */ |
792 |
nratio = 1.0 / nratio; |
793 |
setcolor(ctrans, |
794 |
-mylog(mat -> oargs.farg [0] * rayIn -> pcol [0]), |
795 |
-mylog(mat -> oargs.farg [1] * rayIn -> pcol [1]), |
796 |
-mylog(mat -> oargs.farg [2] * rayIn -> pcol [2])); |
797 |
setcolor(talb, 0, 0, 0); |
798 |
|
799 |
if (mat -> otype == MAT_INTERFACE) { |
800 |
setcolor(rayIn -> cext, |
801 |
-mylog(mat -> oargs.farg [4] * rayIn -> pcol [0]), |
802 |
-mylog(mat -> oargs.farg [5] * rayIn -> pcol [1]), |
803 |
-mylog(mat -> oargs.farg [6] * rayIn -> pcol [2])); |
804 |
setcolor(rayIn -> albedo, 0, 0, 0); |
805 |
rayIn -> gecc = 0; |
806 |
} |
807 |
} |
808 |
|
809 |
/* compute cos theta2 */ |
810 |
d2 = 1 - sqr(nratio) * (1 - sqr(cos1)); |
811 |
|
812 |
if (d2 < FTINY) { |
813 |
/* Total reflection */ |
814 |
refl = cos2 = 1.0; |
815 |
} |
816 |
else { |
817 |
/* Refraction, compute Fresnel's equations */ |
818 |
cos2 = sqrt(d2); |
819 |
d1 = cos1; |
820 |
d2 = nratio * cos2; |
821 |
d1 = (d1 - d2) / (d1 + d2); |
822 |
refl = sqr(d1); |
823 |
d1 = 1 / cos1; |
824 |
d2 = nratio / cos2; |
825 |
d1 = (d1 - d2) / (d1 + d2); |
826 |
refl += sqr(d1); |
827 |
refl *= 0.5; |
828 |
} |
829 |
|
830 |
if (pmapRandom(rouletteState) > refl) { |
831 |
/* Refraction */ |
832 |
photonRay(rayIn, &rayOut, PMAP_REFRACT, NULL); |
833 |
d1 = nratio * cos1 - cos2; |
834 |
|
835 |
for (i = 0; i < 3; i++) |
836 |
rayOut.rdir [i] = nratio * rayIn -> rdir [i] + d1 * dnorm [i]; |
837 |
|
838 |
if (hastexture && DOT(rayOut.rdir, rayIn -> ron) * hastexture >= -FTINY) { |
839 |
d1 *= hastexture; |
840 |
|
841 |
for (i = 0; i < 3; i++) |
842 |
rayOut.rdir [i] = nratio * rayIn -> rdir [i] + |
843 |
d1 * rayIn -> ron [i]; |
844 |
|
845 |
normalize(rayOut.rdir); |
846 |
} |
847 |
|
848 |
copycolor(rayOut.cext, ctrans); |
849 |
copycolor(rayOut.albedo, talb); |
850 |
} |
851 |
|
852 |
else { |
853 |
/* Reflection */ |
854 |
photonRay(rayIn, &rayOut, PMAP_SPECREFL, NULL); |
855 |
VSUM(rayOut.rdir, rayIn -> rdir, dnorm, 2 * cos1); |
856 |
|
857 |
if (hastexture && DOT(rayOut.rdir, rayIn -> ron) * hastexture <= FTINY) |
858 |
for (i = 0; i < 3; i++) |
859 |
rayOut.rdir [i] = rayIn -> rdir [i] + |
860 |
2 * rayIn -> rod * rayIn -> ron [i]; |
861 |
} |
862 |
|
863 |
/* Ray is modified by medium defined by cext and albedo in |
864 |
* photonParticipate() */ |
865 |
tracePhoton(&rayOut); |
866 |
|
867 |
return 0; |
868 |
} |
869 |
|
870 |
|
871 |
|
872 |
static int glassPhotonScatter (OBJREC *mat, RAY *rayIn) |
873 |
/* Generate new photon ray for glass material and recurse */ |
874 |
{ |
875 |
float albedo, xi, ptrans; |
876 |
COLOR mcolor, refl, trans; |
877 |
double pdot, cos2, d, r1e, r1m, rindex = 0.0; |
878 |
FVECT pnorm, pdir; |
879 |
int hastexture, i; |
880 |
RAY rayOut; |
881 |
|
882 |
/* check arguments */ |
883 |
if (mat -> oargs.nfargs == 3) |
884 |
rindex = RINDEX; |
885 |
else if (mat -> oargs.nfargs == 4) |
886 |
rindex = mat -> oargs.farg [3]; |
887 |
else objerror(mat, USER, "bad arguments"); |
888 |
|
889 |
copycolor(mcolor, mat -> oargs.farg); |
890 |
|
891 |
/* get modifiers */ |
892 |
raytexture(rayIn, mat -> omod); |
893 |
|
894 |
/* reorient if necessary */ |
895 |
if (rayIn -> rod < 0) |
896 |
flipsurface(rayIn); |
897 |
if ((hastexture = (DOT(rayIn -> pert, rayIn -> pert) > FTINY * FTINY) )) |
898 |
pdot = raynormal(pnorm, rayIn); |
899 |
else { |
900 |
VCOPY(pnorm, rayIn -> ron); |
901 |
pdot = rayIn -> rod; |
902 |
} |
903 |
|
904 |
/* Modify material color */ |
905 |
multcolor(mcolor, rayIn -> pcol); |
906 |
|
907 |
/* angular transmission */ |
908 |
cos2 = sqrt((1 - 1 / sqr(rindex)) + sqr(pdot / rindex)); |
909 |
setcolor(mcolor, pow(mcolor [0], 1 / cos2), pow(mcolor [1], 1 / cos2), |
910 |
pow(mcolor [2], 1 / cos2)); |
911 |
|
912 |
/* compute reflection */ |
913 |
r1e = (pdot - rindex * cos2) / (pdot + rindex * cos2); |
914 |
r1e *= r1e; |
915 |
r1m = (1 / pdot - rindex / cos2) / (1 / pdot + rindex / cos2); |
916 |
r1m *= r1m; |
917 |
|
918 |
for (i = 0; i < 3; i++) { |
919 |
double r1ed2, r1md2, d2; |
920 |
|
921 |
d = mcolor [i]; |
922 |
d2 = sqr(d); |
923 |
r1ed2 = sqr(r1e) * d2; |
924 |
r1md2 = sqr(r1m) * d2; |
925 |
|
926 |
/* compute transmittance */ |
927 |
trans [i] = 0.5 * d * |
928 |
(sqr(1 - r1e) / (1 - r1ed2) + sqr(1 - r1m) / (1 - r1md2)); |
929 |
|
930 |
/* compute reflectance */ |
931 |
refl [i] = 0.5 * (r1e * (1 + (1 - 2 * r1e) * d2) / (1 - r1ed2) + |
932 |
r1m * (1 + (1 - 2 * r1m) * d2) / (1 - r1md2)); |
933 |
} |
934 |
|
935 |
/* Set up probabilities */ |
936 |
ptrans = colorAvg(trans); |
937 |
albedo = colorAvg(refl) + ptrans; |
938 |
xi = pmapRandom(rouletteState); |
939 |
|
940 |
|
941 |
if (xi > albedo) |
942 |
/* Absorbed */ |
943 |
return 0; |
944 |
|
945 |
if (xi > (albedo -= ptrans)) { |
946 |
/* Transmitted */ |
947 |
|
948 |
if (hastexture) { |
949 |
/* perturb direction */ |
950 |
VSUM(pdir, rayIn -> rdir, rayIn -> pert, 2 * (1 - rindex)); |
951 |
|
952 |
if (normalize(pdir) == 0) { |
953 |
objerror(mat, WARNING, "bad perturbation"); |
954 |
VCOPY(pdir, rayIn -> rdir); |
955 |
} |
956 |
} |
957 |
else VCOPY(pdir, rayIn -> rdir); |
958 |
|
959 |
VCOPY(rayOut.rdir, pdir); |
960 |
photonRay(rayIn, &rayOut, PMAP_SPECTRANS, mcolor); |
961 |
} |
962 |
|
963 |
else { |
964 |
/* reflected ray */ |
965 |
VSUM(rayOut.rdir, rayIn -> rdir, pnorm, 2 * pdot); |
966 |
photonRay(rayIn, &rayOut, PMAP_SPECREFL, mcolor); |
967 |
} |
968 |
|
969 |
tracePhoton(&rayOut); |
970 |
return 0; |
971 |
} |
972 |
|
973 |
|
974 |
|
975 |
static int aliasPhotonScatter (OBJREC *mat, RAY *rayIn) |
976 |
/* Transfer photon scattering to alias target */ |
977 |
{ |
978 |
OBJECT aliasObj; |
979 |
OBJREC aliasRec; |
980 |
|
981 |
/* Straight replacement? */ |
982 |
if (!mat -> oargs.nsargs) { |
983 |
/* Skip void modifier! */ |
984 |
if (mat -> omod != OVOID) { |
985 |
mat = objptr(mat -> omod); |
986 |
photonScatter [mat -> otype] (mat, rayIn); |
987 |
} |
988 |
|
989 |
return 0; |
990 |
} |
991 |
|
992 |
/* Else replace alias */ |
993 |
if (mat -> oargs.nsargs != 1) |
994 |
objerror(mat, INTERNAL, "bad # string arguments"); |
995 |
|
996 |
aliasObj = lastmod(objndx(mat), mat -> oargs.sarg [0]); |
997 |
|
998 |
if (aliasObj < 0) |
999 |
objerror(mat, USER, "bad reference"); |
1000 |
|
1001 |
memcpy(&aliasRec, objptr(aliasObj), sizeof(OBJREC)); |
1002 |
|
1003 |
/* Substitute modifier */ |
1004 |
aliasRec.omod = mat -> omod; |
1005 |
|
1006 |
/* Replacement scattering routine */ |
1007 |
photonScatter [aliasRec.otype] (&aliasRec, rayIn); |
1008 |
return 0; |
1009 |
} |
1010 |
|
1011 |
|
1012 |
|
1013 |
static int clipPhotonScatter (OBJREC *mat, RAY *rayIn) |
1014 |
/* Generate new photon ray for antimatter material and recurse */ |
1015 |
{ |
1016 |
OBJECT obj = objndx(mat), mod, cset [MAXSET + 1], *modset; |
1017 |
int entering, inside = 0, i; |
1018 |
const RAY *rp; |
1019 |
RAY rayOut; |
1020 |
|
1021 |
if ((modset = (OBJECT*)mat -> os) == NULL) { |
1022 |
if (mat -> oargs.nsargs < 1 || mat -> oargs.nsargs > MAXSET) |
1023 |
objerror(mat, USER, "bad # arguments"); |
1024 |
|
1025 |
modset = (OBJECT*)malloc((mat -> oargs.nsargs + 1) * sizeof(OBJECT)); |
1026 |
|
1027 |
if (modset == NULL) |
1028 |
error(SYSTEM, "out of memory in clipPhotonScatter"); |
1029 |
modset [0] = 0; |
1030 |
|
1031 |
for (i = 0; i < mat -> oargs.nsargs; i++) { |
1032 |
if (!strcmp(mat -> oargs.sarg [i], VOIDID)) |
1033 |
continue; |
1034 |
|
1035 |
if ((mod = lastmod(obj, mat -> oargs.sarg [i])) == OVOID) { |
1036 |
sprintf(errmsg, "unknown modifier \"%s\"", mat -> oargs.sarg [i]); |
1037 |
objerror(mat, WARNING, errmsg); |
1038 |
continue; |
1039 |
} |
1040 |
|
1041 |
if (inset(modset, mod)) { |
1042 |
objerror(mat, WARNING, "duplicate modifier"); |
1043 |
continue; |
1044 |
} |
1045 |
|
1046 |
insertelem(modset, mod); |
1047 |
} |
1048 |
|
1049 |
mat -> os = (char*)modset; |
1050 |
} |
1051 |
|
1052 |
if (rayIn -> clipset != NULL) |
1053 |
setcopy(cset, rayIn -> clipset); |
1054 |
else cset [0] = 0; |
1055 |
|
1056 |
entering = rayIn -> rod > 0; |
1057 |
|
1058 |
/* Store photon incident from front if material defined as sensor */ |
1059 |
if (entering && inset(photonSensorSet, obj)) |
1060 |
addPhotons(rayIn); |
1061 |
|
1062 |
for (i = modset [0]; i > 0; i--) { |
1063 |
if (entering) { |
1064 |
if (!inset(cset, modset [i])) { |
1065 |
if (cset [0] >= MAXSET) |
1066 |
error(INTERNAL, "set overflow in clipPhotonScatter"); |
1067 |
insertelem(cset, modset [i]); |
1068 |
} |
1069 |
} |
1070 |
else if (inset(cset, modset [i])) |
1071 |
deletelem(cset, modset [i]); |
1072 |
} |
1073 |
|
1074 |
rayIn -> newcset = cset; |
1075 |
|
1076 |
if (strcmp(mat -> oargs.sarg [0], VOIDID)) { |
1077 |
for (rp = rayIn; rp -> parent != NULL; rp = rp -> parent) { |
1078 |
if ( !(rp -> rtype & RAYREFL) && rp->parent->ro != NULL && |
1079 |
inset(modset, rp -> parent -> ro -> omod)) { |
1080 |
|
1081 |
if (rp -> parent -> rod > 0) |
1082 |
inside++; |
1083 |
else inside--; |
1084 |
} |
1085 |
} |
1086 |
|
1087 |
if (inside > 0) { |
1088 |
flipsurface(rayIn); |
1089 |
mat = objptr(lastmod(obj, mat -> oargs.sarg [0])); |
1090 |
photonScatter [mat -> otype] (mat, rayIn); |
1091 |
return 0; |
1092 |
} |
1093 |
} |
1094 |
|
1095 |
/* Else transfer ray */ |
1096 |
photonRay(rayIn, &rayOut, PMAP_XFER, NULL); |
1097 |
tracePhoton(&rayOut); |
1098 |
|
1099 |
return 0; |
1100 |
} |
1101 |
|
1102 |
|
1103 |
|
1104 |
static int mirrorPhotonScatter (OBJREC *mat, RAY *rayIn) |
1105 |
/* Generate new photon ray for mirror material and recurse */ |
1106 |
{ |
1107 |
RAY rayOut; |
1108 |
int rpure = 1, i; |
1109 |
FVECT pnorm; |
1110 |
double pdot; |
1111 |
float albedo; |
1112 |
COLOR mcolor; |
1113 |
|
1114 |
/* check arguments */ |
1115 |
if (mat -> oargs.nfargs != 3 || mat -> oargs.nsargs > 1) |
1116 |
objerror(mat, USER, "bad number of arguments"); |
1117 |
|
1118 |
/* back is black */ |
1119 |
if (rayIn -> rod < 0) |
1120 |
return 0; |
1121 |
|
1122 |
/* get modifiers */ |
1123 |
raytexture(rayIn, mat -> omod); |
1124 |
|
1125 |
/* assign material color */ |
1126 |
copycolor(mcolor, mat -> oargs.farg); |
1127 |
multcolor(mcolor, rayIn -> pcol); |
1128 |
|
1129 |
/* Set up probabilities */ |
1130 |
albedo = colorAvg(mcolor); |
1131 |
|
1132 |
if (pmapRandom(rouletteState) > albedo) |
1133 |
/* Absorbed */ |
1134 |
return 0; |
1135 |
|
1136 |
/* compute reflected ray */ |
1137 |
photonRay(rayIn, &rayOut, PMAP_SPECREFL, mcolor); |
1138 |
|
1139 |
if (DOT(rayIn -> pert, rayIn -> pert) > sqr(FTINY)) { |
1140 |
/* use textures */ |
1141 |
pdot = raynormal(pnorm, rayIn); |
1142 |
|
1143 |
for (i = 0; i < 3; i++) |
1144 |
rayOut.rdir [i] = rayIn -> rdir [i] + 2 * pdot * pnorm [i]; |
1145 |
|
1146 |
rpure = 0; |
1147 |
} |
1148 |
|
1149 |
/* Check for penetration */ |
1150 |
if (rpure || DOT(rayOut.rdir, rayIn -> ron) <= FTINY) |
1151 |
for (i = 0; i < 3; i++) |
1152 |
rayOut.rdir [i] = rayIn -> rdir [i] + |
1153 |
2 * rayIn -> rod * rayIn -> ron [i]; |
1154 |
|
1155 |
tracePhoton(&rayOut); |
1156 |
return 0; |
1157 |
} |
1158 |
|
1159 |
|
1160 |
|
1161 |
static int mistPhotonScatter (OBJREC *mat, RAY *rayIn) |
1162 |
/* Generate new photon ray within mist and recurse */ |
1163 |
{ |
1164 |
COLOR mext; |
1165 |
RREAL re, ge, be; |
1166 |
RAY rayOut; |
1167 |
|
1168 |
/* check arguments */ |
1169 |
if (mat -> oargs.nfargs > 7) |
1170 |
objerror(mat, USER, "bad arguments"); |
1171 |
|
1172 |
if (mat -> oargs.nfargs > 2) { |
1173 |
/* compute extinction */ |
1174 |
copycolor(mext, mat -> oargs.farg); |
1175 |
/* get modifiers */ |
1176 |
raytexture(rayIn, mat -> omod); |
1177 |
multcolor(mext, rayIn -> pcol); |
1178 |
} |
1179 |
else setcolor(mext, 0, 0, 0); |
1180 |
|
1181 |
photonRay(rayIn, &rayOut, PMAP_XFER, NULL); |
1182 |
|
1183 |
if (rayIn -> rod > 0) { |
1184 |
/* entering ray */ |
1185 |
addcolor(rayOut.cext, mext); |
1186 |
|
1187 |
if (mat -> oargs.nfargs > 5) |
1188 |
copycolor(rayOut.albedo, mat -> oargs.farg + 3); |
1189 |
if (mat -> oargs.nfargs > 6) |
1190 |
rayOut.gecc = mat -> oargs.farg [6]; |
1191 |
} |
1192 |
|
1193 |
else { |
1194 |
/* leaving ray */ |
1195 |
re = max(rayIn -> cext [0] - mext [0], cextinction [0]); |
1196 |
ge = max(rayIn -> cext [1] - mext [1], cextinction [1]); |
1197 |
be = max(rayIn -> cext [2] - mext [2], cextinction [2]); |
1198 |
setcolor(rayOut.cext, re, ge, be); |
1199 |
|
1200 |
if (mat -> oargs.nfargs > 5) |
1201 |
copycolor(rayOut.albedo, salbedo); |
1202 |
if (mat -> oargs.nfargs > 6) |
1203 |
rayOut.gecc = seccg; |
1204 |
} |
1205 |
|
1206 |
tracePhoton(&rayOut); |
1207 |
|
1208 |
return 0; |
1209 |
} |
1210 |
|
1211 |
|
1212 |
|
1213 |
static int mx_dataPhotonScatter (OBJREC *mat, RAY *rayIn) |
1214 |
/* Pass photon on to materials selected by mixture data */ |
1215 |
{ |
1216 |
OBJECT obj; |
1217 |
double coef, pt [MAXDIM]; |
1218 |
DATARRAY *dp; |
1219 |
OBJECT mod [2]; |
1220 |
MFUNC *mf; |
1221 |
int i; |
1222 |
|
1223 |
if (mat -> oargs.nsargs < 6) |
1224 |
objerror(mat, USER, "bad # arguments"); |
1225 |
|
1226 |
obj = objndx(mat); |
1227 |
|
1228 |
for (i = 0; i < 2; i++) |
1229 |
if (!strcmp(mat -> oargs.sarg [i], VOIDID)) |
1230 |
mod [i] = OVOID; |
1231 |
else if ((mod [i] = lastmod(obj, mat -> oargs.sarg [i])) == OVOID) { |
1232 |
sprintf(errmsg, "undefined modifier \"%s\"", mat -> oargs.sarg [i]); |
1233 |
objerror(mat, USER, errmsg); |
1234 |
} |
1235 |
|
1236 |
dp = getdata(mat -> oargs.sarg [3]); |
1237 |
i = (1 << dp -> nd) - 1; |
1238 |
mf = getfunc(mat, 4, i << 5, 0); |
1239 |
setfunc(mat, rayIn); |
1240 |
errno = 0; |
1241 |
|
1242 |
for (i = 0; i < dp -> nd; i++) { |
1243 |
pt [i] = evalue(mf -> ep [i]); |
1244 |
|
1245 |
if (errno) { |
1246 |
objerror(mat, WARNING, "compute error"); |
1247 |
return 0; |
1248 |
} |
1249 |
} |
1250 |
|
1251 |
coef = datavalue(dp, pt); |
1252 |
errno = 0; |
1253 |
coef = funvalue(mat -> oargs.sarg [2], 1, &coef); |
1254 |
|
1255 |
if (errno) |
1256 |
objerror(mat, WARNING, "compute error"); |
1257 |
else { |
1258 |
OBJECT mxMod = mod [pmapRandom(rouletteState) < coef ? 0 : 1]; |
1259 |
|
1260 |
if (mxMod != OVOID) { |
1261 |
mat = objptr(mxMod); |
1262 |
photonScatter [mat -> otype] (mat, rayIn); |
1263 |
} |
1264 |
else { |
1265 |
/* Transfer ray if no modifier */ |
1266 |
RAY rayOut; |
1267 |
|
1268 |
photonRay(rayIn, &rayOut, PMAP_XFER, NULL); |
1269 |
tracePhoton(&rayOut); |
1270 |
} |
1271 |
} |
1272 |
|
1273 |
return 0; |
1274 |
} |
1275 |
|
1276 |
|
1277 |
|
1278 |
static int mx_pdataPhotonScatter (OBJREC *mat, RAY *rayIn) |
1279 |
/* Pass photon on to materials selected by mixture picture */ |
1280 |
{ |
1281 |
OBJECT obj; |
1282 |
double col [3], coef, pt [MAXDIM]; |
1283 |
DATARRAY *dp; |
1284 |
OBJECT mod [2]; |
1285 |
MFUNC *mf; |
1286 |
int i; |
1287 |
|
1288 |
if (mat -> oargs.nsargs < 7) |
1289 |
objerror(mat, USER, "bad # arguments"); |
1290 |
|
1291 |
obj = objndx(mat); |
1292 |
|
1293 |
for (i = 0; i < 2; i++) |
1294 |
if (!strcmp(mat -> oargs.sarg [i], VOIDID)) |
1295 |
mod [i] = OVOID; |
1296 |
else if ((mod [i] = lastmod(obj, mat -> oargs.sarg [i])) == OVOID) { |
1297 |
sprintf(errmsg, "undefined modifier \"%s\"", mat -> oargs.sarg [i]); |
1298 |
objerror(mat, USER, errmsg); |
1299 |
} |
1300 |
|
1301 |
dp = getpict(mat -> oargs.sarg [3]); |
1302 |
mf = getfunc(mat, 4, 0x3 << 5, 0); |
1303 |
setfunc(mat, rayIn); |
1304 |
errno = 0; |
1305 |
pt [1] = evalue(mf -> ep [0]); |
1306 |
pt [0] = evalue(mf -> ep [1]); |
1307 |
|
1308 |
if (errno) { |
1309 |
objerror(mat, WARNING, "compute error"); |
1310 |
return 0; |
1311 |
} |
1312 |
|
1313 |
for (i = 0; i < 3; i++) |
1314 |
col [i] = datavalue(dp + i, pt); |
1315 |
|
1316 |
errno = 0; |
1317 |
coef = funvalue(mat -> oargs.sarg [2], 3, col); |
1318 |
|
1319 |
if (errno) |
1320 |
objerror(mat, WARNING, "compute error"); |
1321 |
else { |
1322 |
OBJECT mxMod = mod [pmapRandom(rouletteState) < coef ? 0 : 1]; |
1323 |
|
1324 |
if (mxMod != OVOID) { |
1325 |
mat = objptr(mxMod); |
1326 |
photonScatter [mat -> otype] (mat, rayIn); |
1327 |
} |
1328 |
else { |
1329 |
/* Transfer ray if no modifier */ |
1330 |
RAY rayOut; |
1331 |
|
1332 |
photonRay(rayIn, &rayOut, PMAP_XFER, NULL); |
1333 |
tracePhoton(&rayOut); |
1334 |
} |
1335 |
} |
1336 |
|
1337 |
return 0; |
1338 |
} |
1339 |
|
1340 |
|
1341 |
|
1342 |
static int mx_funcPhotonScatter (OBJREC *mat, RAY *rayIn) |
1343 |
/* Pass photon on to materials selected by mixture function */ |
1344 |
{ |
1345 |
OBJECT obj, mod [2]; |
1346 |
int i; |
1347 |
double coef; |
1348 |
MFUNC *mf; |
1349 |
|
1350 |
if (mat -> oargs.nsargs < 4) |
1351 |
objerror(mat, USER, "bad # arguments"); |
1352 |
|
1353 |
obj = objndx(mat); |
1354 |
|
1355 |
for (i = 0; i < 2; i++) |
1356 |
if (!strcmp(mat -> oargs.sarg [i], VOIDID)) |
1357 |
mod [i] = OVOID; |
1358 |
else if ((mod [i] = lastmod(obj, mat -> oargs.sarg [i])) == OVOID) { |
1359 |
sprintf(errmsg, "undefined modifier \"%s\"", mat -> oargs.sarg [i]); |
1360 |
objerror(mat, USER, errmsg); |
1361 |
} |
1362 |
|
1363 |
mf = getfunc(mat, 3, 0x4, 0); |
1364 |
setfunc(mat, rayIn); |
1365 |
errno = 0; |
1366 |
|
1367 |
/* bound coefficient */ |
1368 |
coef = min(1, max(0, evalue(mf -> ep [0]))); |
1369 |
|
1370 |
if (errno) |
1371 |
objerror(mat, WARNING, "compute error"); |
1372 |
else { |
1373 |
OBJECT mxMod = mod [pmapRandom(rouletteState) < coef ? 0 : 1]; |
1374 |
|
1375 |
if (mxMod != OVOID) { |
1376 |
mat = objptr(mxMod); |
1377 |
photonScatter [mat -> otype] (mat, rayIn); |
1378 |
} |
1379 |
else { |
1380 |
/* Transfer ray if no modifier */ |
1381 |
RAY rayOut; |
1382 |
|
1383 |
photonRay(rayIn, &rayOut, PMAP_XFER, NULL); |
1384 |
tracePhoton(&rayOut); |
1385 |
} |
1386 |
} |
1387 |
|
1388 |
return 0; |
1389 |
} |
1390 |
|
1391 |
|
1392 |
|
1393 |
static int pattexPhotonScatter (OBJREC *mat, RAY *rayIn) |
1394 |
/* Generate new photon ray for pattern or texture modifier and recurse. |
1395 |
This code is brought to you by Henkel! :^) */ |
1396 |
{ |
1397 |
RAY rayOut; |
1398 |
|
1399 |
/* Get pattern */ |
1400 |
ofun [mat -> otype].funp(mat, rayIn); |
1401 |
if (mat -> omod != OVOID) { |
1402 |
/* Scatter using modifier (if any) */ |
1403 |
mat = objptr(mat -> omod); |
1404 |
photonScatter [mat -> otype] (mat, rayIn); |
1405 |
} |
1406 |
else { |
1407 |
/* Transfer ray if no modifier */ |
1408 |
photonRay(rayIn, &rayOut, PMAP_XFER, NULL); |
1409 |
tracePhoton(&rayOut); |
1410 |
} |
1411 |
|
1412 |
return 0; |
1413 |
} |
1414 |
|
1415 |
|
1416 |
|
1417 |
/* |
1418 |
================================================================== |
1419 |
The following code is |
1420 |
(c) Lucerne University of Applied Sciences and Arts, |
1421 |
supported by the Swiss National Science Foundation (SNSF, #147053) |
1422 |
================================================================== |
1423 |
*/ |
1424 |
|
1425 |
static int bsdfPhotonScatter (OBJREC *mat, RAY *rayIn) |
1426 |
/* Generate new photon ray for BSDF modifier and recurse. */ |
1427 |
{ |
1428 |
int hitFront; |
1429 |
SDError err; |
1430 |
SDValue bsdfVal; |
1431 |
FVECT upvec; |
1432 |
MFUNC *mf; |
1433 |
BSDFDAT nd; |
1434 |
RAY rayOut; |
1435 |
COLOR bsdfRGB; |
1436 |
int transmitted; |
1437 |
double prDiff, ptDiff, prDiffSD, ptDiffSD, prSpecSD, ptSpecSD, |
1438 |
albedo, xi; |
1439 |
const double patAlb = bright(rayIn -> pcol); |
1440 |
|
1441 |
/* Following code adapted from m_bsdf() */ |
1442 |
/* Check arguments */ |
1443 |
if (mat -> oargs.nsargs < 6 || mat -> oargs.nfargs > 9 || |
1444 |
mat -> oargs.nfargs % 3) |
1445 |
objerror(mat, USER, "bad # arguments"); |
1446 |
|
1447 |
hitFront = (rayIn -> rod > 0); |
1448 |
|
1449 |
/* Load cal file */ |
1450 |
mf = getfunc(mat, 5, 0x1d, 1); |
1451 |
|
1452 |
/* Get thickness */ |
1453 |
nd.thick = evalue(mf -> ep [0]); |
1454 |
if ((-FTINY <= nd.thick) & (nd.thick <= FTINY)) |
1455 |
nd.thick = .0; |
1456 |
|
1457 |
/* Get BSDF data */ |
1458 |
nd.sd = loadBSDF(mat -> oargs.sarg [1]); |
1459 |
|
1460 |
/* Extra diffuse reflectance from material def */ |
1461 |
if (hitFront) { |
1462 |
if (mat -> oargs.nfargs < 3) |
1463 |
setcolor(nd.rdiff, .0, .0, .0); |
1464 |
else setcolor(nd.rdiff, mat -> oargs.farg [0], mat -> oargs.farg [1], |
1465 |
mat -> oargs.farg [2]); |
1466 |
} |
1467 |
else if (mat -> oargs.nfargs < 6) { |
1468 |
/* Check for absorbing backside */ |
1469 |
if (!backvis && !nd.sd -> rb && !nd.sd -> tf) { |
1470 |
SDfreeCache(nd.sd); |
1471 |
return 0; |
1472 |
} |
1473 |
|
1474 |
setcolor(nd.rdiff, .0, .0, .0); |
1475 |
} |
1476 |
else setcolor(nd.rdiff, mat -> oargs.farg [3], mat -> oargs.farg [4], |
1477 |
mat -> oargs.farg [5]); |
1478 |
|
1479 |
/* Extra diffuse transmittance from material def */ |
1480 |
if (mat -> oargs.nfargs < 9) |
1481 |
setcolor(nd.tdiff, .0, .0, .0); |
1482 |
else setcolor(nd.tdiff, mat -> oargs.farg [6], mat -> oargs.farg [7], |
1483 |
mat -> oargs.farg [8]); |
1484 |
|
1485 |
nd.mp = mat; |
1486 |
nd.pr = rayIn; |
1487 |
|
1488 |
/* Get modifiers */ |
1489 |
raytexture(rayIn, mat -> omod); |
1490 |
|
1491 |
/* Modify diffuse values */ |
1492 |
multcolor(nd.rdiff, rayIn -> pcol); |
1493 |
multcolor(nd.tdiff, rayIn -> pcol); |
1494 |
|
1495 |
/* Get up vector & xform to world coords */ |
1496 |
upvec [0] = evalue(mf -> ep [1]); |
1497 |
upvec [1] = evalue(mf -> ep [2]); |
1498 |
upvec [2] = evalue(mf -> ep [3]); |
1499 |
|
1500 |
if (mf -> fxp != &unitxf) { |
1501 |
multv3(upvec, upvec, mf -> fxp -> xfm); |
1502 |
nd.thick *= mf -> fxp -> sca; |
1503 |
} |
1504 |
|
1505 |
if (rayIn -> rox) { |
1506 |
multv3(upvec, upvec, rayIn -> rox -> f.xfm); |
1507 |
nd.thick *= rayIn -> rox -> f.sca; |
1508 |
} |
1509 |
|
1510 |
/* Perturb normal */ |
1511 |
raynormal(nd.pnorm, rayIn); |
1512 |
|
1513 |
/* Xform incident dir to local BSDF coords */ |
1514 |
err = SDcompXform(nd.toloc, nd.pnorm, upvec); |
1515 |
|
1516 |
if (!err) { |
1517 |
nd.vray [0] = -rayIn -> rdir [0]; |
1518 |
nd.vray [1] = -rayIn -> rdir [1]; |
1519 |
nd.vray [2] = -rayIn -> rdir [2]; |
1520 |
err = SDmapDir(nd.vray, nd.toloc, nd.vray); |
1521 |
} |
1522 |
|
1523 |
if (!err) |
1524 |
err = SDinvXform(nd.fromloc, nd.toloc); |
1525 |
|
1526 |
if (err) { |
1527 |
objerror(mat, WARNING, "Illegal orientation vector"); |
1528 |
return 0; |
1529 |
} |
1530 |
|
1531 |
/* Determine BSDF resolution */ |
1532 |
err = SDsizeBSDF(nd.sr_vpsa, nd.vray, NULL, SDqueryMin + SDqueryMax, nd.sd); |
1533 |
|
1534 |
if (err) |
1535 |
objerror(mat, USER, transSDError(err)); |
1536 |
|
1537 |
nd.sr_vpsa [0] = sqrt(nd.sr_vpsa [0]); |
1538 |
nd.sr_vpsa [1] = sqrt(nd.sr_vpsa [1]); |
1539 |
|
1540 |
/* Orient perturbed normal towards incident side */ |
1541 |
if (!hitFront) { |
1542 |
nd.pnorm [0] = -nd.pnorm [0]; |
1543 |
nd.pnorm [1] = -nd.pnorm [1]; |
1544 |
nd.pnorm [2] = -nd.pnorm [2]; |
1545 |
} |
1546 |
|
1547 |
/* Get scatter probabilities (weighted by pattern except for spec refl) |
1548 |
* prDiff, ptDiff: extra diffuse component in material def |
1549 |
* prDiffSD, ptDiffSD: diffuse (constant) component in SDF |
1550 |
* prSpecSD, ptSpecSD: non-diffuse ("specular") component in SDF |
1551 |
* albedo: sum of above, inverse absorption probability */ |
1552 |
prDiff = colorAvg(nd.rdiff); |
1553 |
ptDiff = colorAvg(nd.tdiff); |
1554 |
prDiffSD = patAlb * SDdirectHemi(nd.vray, SDsampDf | SDsampR, nd.sd); |
1555 |
ptDiffSD = patAlb * SDdirectHemi(nd.vray, SDsampDf | SDsampT, nd.sd); |
1556 |
prSpecSD = SDdirectHemi(nd.vray, SDsampSp | SDsampR, nd.sd); |
1557 |
ptSpecSD = patAlb * SDdirectHemi(nd.vray, SDsampSp | SDsampT, nd.sd); |
1558 |
albedo = prDiff + ptDiff + prDiffSD + ptDiffSD + prSpecSD + ptSpecSD; |
1559 |
|
1560 |
/* |
1561 |
if (albedo > 1) |
1562 |
objerror(mat, WARNING, "Invalid albedo"); |
1563 |
*/ |
1564 |
|
1565 |
/* Insert direct and indirect photon hits if diffuse component */ |
1566 |
if (prDiff + ptDiff + prDiffSD + ptDiffSD > FTINY) |
1567 |
addPhotons(rayIn); |
1568 |
|
1569 |
xi = pmapRandom(rouletteState); |
1570 |
|
1571 |
if (xi > albedo) |
1572 |
/* Absorbtion */ |
1573 |
return 0; |
1574 |
|
1575 |
transmitted = 0; |
1576 |
|
1577 |
if ((xi -= prDiff) <= 0) { |
1578 |
/* Diffuse reflection (extra component in material def) */ |
1579 |
photonRay(rayIn, &rayOut, PMAP_DIFFREFL, nd.rdiff); |
1580 |
diffPhotonScatter(nd.pnorm, &rayOut); |
1581 |
} |
1582 |
|
1583 |
else if ((xi -= ptDiff) <= 0) { |
1584 |
/* Diffuse transmission (extra component in material def) */ |
1585 |
flipsurface(rayIn); |
1586 |
nd.thick = -nd.thick; |
1587 |
photonRay(rayIn, &rayOut, PMAP_DIFFTRANS, nd.tdiff); |
1588 |
diffPhotonScatter(nd.pnorm, &rayOut); |
1589 |
transmitted = 1; |
1590 |
} |
1591 |
|
1592 |
else { /* Sample SDF */ |
1593 |
if ((xi -= prDiffSD) <= 0) { |
1594 |
/* Diffuse SDF reflection (constant component) */ |
1595 |
if ((err = SDsampBSDF(&bsdfVal, nd.vray, pmapRandom(scatterState), |
1596 |
SDsampDf | SDsampR, nd.sd))) |
1597 |
objerror(mat, USER, transSDError(err)); |
1598 |
|
1599 |
/* Apply pattern to spectral component */ |
1600 |
ccy2rgb(&bsdfVal.spec, bsdfVal.cieY, bsdfRGB); |
1601 |
multcolor(bsdfRGB, rayIn -> pcol); |
1602 |
photonRay(rayIn, &rayOut, PMAP_DIFFREFL, bsdfRGB); |
1603 |
} |
1604 |
|
1605 |
else if ((xi -= ptDiffSD) <= 0) { |
1606 |
/* Diffuse SDF transmission (constant component) */ |
1607 |
if ((err = SDsampBSDF(&bsdfVal, nd.vray, pmapRandom(scatterState), |
1608 |
SDsampDf | SDsampT, nd.sd))) |
1609 |
objerror(mat, USER, transSDError(err)); |
1610 |
|
1611 |
/* Apply pattern to spectral component */ |
1612 |
ccy2rgb(&bsdfVal.spec, bsdfVal.cieY, bsdfRGB); |
1613 |
multcolor(bsdfRGB, rayIn -> pcol); |
1614 |
addcolor(bsdfRGB, nd.tdiff); |
1615 |
flipsurface(rayIn); /* Necessary? */ |
1616 |
nd.thick = -nd.thick; |
1617 |
photonRay(rayIn, &rayOut, PMAP_DIFFTRANS, bsdfRGB); |
1618 |
transmitted = 1; |
1619 |
} |
1620 |
|
1621 |
else if ((xi -= prSpecSD) <= 0) { |
1622 |
/* Non-diffuse ("specular") SDF reflection */ |
1623 |
if ((err = SDsampBSDF(&bsdfVal, nd.vray, pmapRandom(scatterState), |
1624 |
SDsampSp | SDsampR, nd.sd))) |
1625 |
objerror(mat, USER, transSDError(err)); |
1626 |
|
1627 |
ccy2rgb(&bsdfVal.spec, bsdfVal.cieY, bsdfRGB); |
1628 |
photonRay(rayIn, &rayOut, PMAP_SPECREFL, bsdfRGB); |
1629 |
} |
1630 |
|
1631 |
else { |
1632 |
/* Non-diffuse ("specular") SDF transmission */ |
1633 |
if ((err = SDsampBSDF(&bsdfVal, nd.vray, pmapRandom(scatterState), |
1634 |
SDsampSp | SDsampT, nd.sd))) |
1635 |
objerror(mat, USER, transSDError(err)); |
1636 |
|
1637 |
/* Apply pattern to spectral component */ |
1638 |
ccy2rgb(&bsdfVal.spec, bsdfVal.cieY, bsdfRGB); |
1639 |
multcolor(bsdfRGB, rayIn -> pcol); |
1640 |
flipsurface(rayIn); /* Necessary? */ |
1641 |
nd.thick = -nd.thick; |
1642 |
photonRay(rayIn, &rayOut, PMAP_SPECTRANS, bsdfRGB); |
1643 |
transmitted = 1; |
1644 |
} |
1645 |
|
1646 |
/* Xform outgoing dir to world coords */ |
1647 |
if ((err = SDmapDir(rayOut.rdir, nd.fromloc, nd.vray))) { |
1648 |
objerror(mat, USER, transSDError(err)); |
1649 |
return 0; |
1650 |
} |
1651 |
} |
1652 |
|
1653 |
/* Clean up */ |
1654 |
SDfreeCache(nd.sd); |
1655 |
|
1656 |
/* Need to offset ray origin to get past detail geometry? */ |
1657 |
if (transmitted && nd.thick != 0) |
1658 |
VSUM(rayOut.rorg, rayOut.rorg, rayIn -> ron, -nd.thick); |
1659 |
|
1660 |
tracePhoton(&rayOut); |
1661 |
return 0; |
1662 |
} |
1663 |
|
1664 |
|
1665 |
|
1666 |
static int lightPhotonScatter (OBJREC* mat, RAY* ray) |
1667 |
/* Light sources doan' reflect */ |
1668 |
{ |
1669 |
return 0; |
1670 |
} |
1671 |
|
1672 |
|
1673 |
|
1674 |
void initPhotonScatterFuncs () |
1675 |
/* Init photonScatter[] dispatch table */ |
1676 |
{ |
1677 |
int i; |
1678 |
|
1679 |
for (i = 0; i < NUMOTYPE; i++) |
1680 |
photonScatter [i] = o_default; |
1681 |
|
1682 |
photonScatter [MAT_LIGHT] = photonScatter [MAT_ILLUM] = |
1683 |
photonScatter [MAT_GLOW] = photonScatter [MAT_SPOT] = |
1684 |
lightPhotonScatter; |
1685 |
|
1686 |
photonScatter [MAT_PLASTIC] = photonScatter [MAT_METAL] = |
1687 |
photonScatter [MAT_TRANS] = normalPhotonScatter; |
1688 |
|
1689 |
photonScatter [MAT_PLASTIC2] = photonScatter [MAT_METAL2] = |
1690 |
photonScatter [MAT_TRANS2] = anisoPhotonScatter; |
1691 |
|
1692 |
photonScatter [MAT_DIELECTRIC] = photonScatter [MAT_INTERFACE] = |
1693 |
dielectricPhotonScatter; |
1694 |
|
1695 |
photonScatter [MAT_MIST] = mistPhotonScatter; |
1696 |
photonScatter [MAT_GLASS] = glassPhotonScatter; |
1697 |
photonScatter [MAT_CLIP] = clipPhotonScatter; |
1698 |
photonScatter [MAT_MIRROR] = mirrorPhotonScatter; |
1699 |
photonScatter [MIX_FUNC] = mx_funcPhotonScatter; |
1700 |
photonScatter [MIX_DATA] = mx_dataPhotonScatter; |
1701 |
photonScatter [MIX_PICT]= mx_pdataPhotonScatter; |
1702 |
|
1703 |
photonScatter [PAT_BDATA] = photonScatter [PAT_CDATA] = |
1704 |
photonScatter [PAT_BFUNC] = photonScatter [PAT_CFUNC] = |
1705 |
photonScatter [PAT_CPICT] = photonScatter [TEX_FUNC] = |
1706 |
photonScatter [TEX_DATA] = pattexPhotonScatter; |
1707 |
|
1708 |
photonScatter [MOD_ALIAS] = aliasPhotonScatter; |
1709 |
photonScatter [MAT_BSDF] = bsdfPhotonScatter; |
1710 |
} |