1 |
– |
/* Copyright (c) 1992 Regents of the University of California */ |
2 |
– |
|
1 |
|
#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
|
#endif |
6 |
– |
|
4 |
|
/* |
5 |
|
* normal.c - shading function for normal materials. |
6 |
|
* |
11 |
|
* Later changes described in delta comments. |
12 |
|
*/ |
13 |
|
|
14 |
+ |
/* ==================================================================== |
15 |
+ |
* The Radiance Software License, Version 1.0 |
16 |
+ |
* |
17 |
+ |
* Copyright (c) 1990 - 2002 The Regents of the University of California, |
18 |
+ |
* through Lawrence Berkeley National Laboratory. All rights reserved. |
19 |
+ |
* |
20 |
+ |
* Redistribution and use in source and binary forms, with or without |
21 |
+ |
* modification, are permitted provided that the following conditions |
22 |
+ |
* are met: |
23 |
+ |
* |
24 |
+ |
* 1. Redistributions of source code must retain the above copyright |
25 |
+ |
* notice, this list of conditions and the following disclaimer. |
26 |
+ |
* |
27 |
+ |
* 2. Redistributions in binary form must reproduce the above copyright |
28 |
+ |
* notice, this list of conditions and the following disclaimer in |
29 |
+ |
* the documentation and/or other materials provided with the |
30 |
+ |
* distribution. |
31 |
+ |
* |
32 |
+ |
* 3. The end-user documentation included with the redistribution, |
33 |
+ |
* if any, must include the following acknowledgment: |
34 |
+ |
* "This product includes Radiance software |
35 |
+ |
* (http://radsite.lbl.gov/) |
36 |
+ |
* developed by the Lawrence Berkeley National Laboratory |
37 |
+ |
* (http://www.lbl.gov/)." |
38 |
+ |
* Alternately, this acknowledgment may appear in the software itself, |
39 |
+ |
* if and wherever such third-party acknowledgments normally appear. |
40 |
+ |
* |
41 |
+ |
* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
42 |
+ |
* and "The Regents of the University of California" must |
43 |
+ |
* not be used to endorse or promote products derived from this |
44 |
+ |
* software without prior written permission. For written |
45 |
+ |
* permission, please contact [email protected]. |
46 |
+ |
* |
47 |
+ |
* 5. Products derived from this software may not be called "Radiance", |
48 |
+ |
* nor may "Radiance" appear in their name, without prior written |
49 |
+ |
* permission of Lawrence Berkeley National Laboratory. |
50 |
+ |
* |
51 |
+ |
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
52 |
+ |
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
53 |
+ |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
54 |
+ |
* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
55 |
+ |
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
56 |
+ |
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
57 |
+ |
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
58 |
+ |
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
59 |
+ |
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
60 |
+ |
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
61 |
+ |
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
62 |
+ |
* SUCH DAMAGE. |
63 |
+ |
* ==================================================================== |
64 |
+ |
* |
65 |
+ |
* This software consists of voluntary contributions made by many |
66 |
+ |
* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
67 |
+ |
* information on Lawrence Berkeley National Laboratory, please see |
68 |
+ |
* <http://www.lbl.gov/>. |
69 |
+ |
*/ |
70 |
+ |
|
71 |
|
#include "ray.h" |
72 |
|
|
73 |
|
#include "otypes.h" |
74 |
|
|
75 |
|
#include "random.h" |
76 |
|
|
77 |
< |
extern double specthresh; /* specular sampling threshold */ |
78 |
< |
extern double specjitter; /* specular sampling jitter */ |
77 |
> |
#ifndef MAXITER |
78 |
> |
#define MAXITER 10 /* maximum # specular ray attempts */ |
79 |
> |
#endif |
80 |
> |
/* estimate of Fresnel function */ |
81 |
> |
#define FRESNE(ci) (exp(-6.0*(ci)) - 0.00247875217) |
82 |
|
|
83 |
< |
static gaussamp(); |
83 |
> |
static void gaussamp(); |
84 |
|
|
85 |
|
/* |
86 |
|
* This routine implements the isotropic Gaussian |
120 |
|
} NORMDAT; /* normal material data */ |
121 |
|
|
122 |
|
|
123 |
+ |
static void |
124 |
|
dirnorm(cval, np, ldir, omega) /* compute source contribution */ |
125 |
|
COLOR cval; /* returned coefficient */ |
126 |
|
register NORMDAT *np; /* material data */ |
128 |
|
double omega; /* light source size */ |
129 |
|
{ |
130 |
|
double ldot; |
131 |
+ |
double ldiff; |
132 |
|
double dtmp, d2; |
133 |
|
FVECT vtmp; |
134 |
|
COLOR ctmp; |
140 |
|
if (ldot < 0.0 ? np->trans <= FTINY : np->trans >= 1.0-FTINY) |
141 |
|
return; /* wrong side */ |
142 |
|
|
143 |
< |
if (ldot > FTINY && np->rdiff > FTINY) { |
143 |
> |
/* Fresnel estimate */ |
144 |
> |
ldiff = np->rdiff; |
145 |
> |
if (np->specfl & SP_PURE && (np->rspec > FTINY & ldiff > FTINY)) |
146 |
> |
ldiff *= 1. - FRESNE(fabs(ldot)); |
147 |
> |
|
148 |
> |
if (ldot > FTINY && ldiff > FTINY) { |
149 |
|
/* |
150 |
|
* Compute and add diffuse reflected component to returned |
151 |
|
* color. The diffuse reflected component will always be |
152 |
|
* modified by the color of the material. |
153 |
|
*/ |
154 |
|
copycolor(ctmp, np->mcolor); |
155 |
< |
dtmp = ldot * omega * np->rdiff / PI; |
155 |
> |
dtmp = ldot * omega * ldiff / PI; |
156 |
|
scalecolor(ctmp, dtmp); |
157 |
|
addcolor(cval, ctmp); |
158 |
|
} |
212 |
|
} |
213 |
|
|
214 |
|
|
215 |
+ |
int |
216 |
|
m_normal(m, r) /* color a ray that hit something normal */ |
217 |
|
register OBJREC *m; |
218 |
|
register RAY *r; |
219 |
|
{ |
220 |
|
NORMDAT nd; |
221 |
+ |
double fest; |
222 |
|
double transtest, transdist; |
223 |
+ |
double mirtest, mirdist; |
224 |
+ |
int hastexture; |
225 |
+ |
double d; |
226 |
|
COLOR ctmp; |
227 |
|
register int i; |
228 |
|
/* easy shadow test */ |
229 |
|
if (r->crtype & SHADOW && m->otype != MAT_TRANS) |
230 |
< |
return; |
230 |
> |
return(1); |
231 |
|
|
232 |
|
if (m->oargs.nfargs != (m->otype == MAT_TRANS ? 7 : 5)) |
233 |
|
objerror(m, USER, "bad number of arguments"); |
234 |
+ |
/* check for back side */ |
235 |
+ |
if (r->rod < 0.0) { |
236 |
+ |
if (!backvis && m->otype != MAT_TRANS) { |
237 |
+ |
raytrans(r); |
238 |
+ |
return(1); |
239 |
+ |
} |
240 |
+ |
flipsurface(r); /* reorient if backvis */ |
241 |
+ |
} |
242 |
|
nd.mp = m; |
243 |
|
nd.rp = r; |
244 |
|
/* get material color */ |
250 |
|
nd.alpha2 = m->oargs.farg[4]; |
251 |
|
if ((nd.alpha2 *= nd.alpha2) <= FTINY) |
252 |
|
nd.specfl |= SP_PURE; |
253 |
< |
/* reorient if necessary */ |
254 |
< |
if (r->rod < 0.0) |
178 |
< |
flipsurface(r); |
253 |
> |
if (r->ro != NULL && isflat(r->ro->otype)) |
254 |
> |
nd.specfl |= SP_FLAT; |
255 |
|
/* get modifiers */ |
256 |
|
raytexture(r, m->omod); |
257 |
< |
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
257 |
> |
if (hastexture = DOT(r->pert,r->pert) > FTINY*FTINY) |
258 |
> |
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
259 |
> |
else { |
260 |
> |
VCOPY(nd.pnorm, r->ron); |
261 |
> |
nd.pdot = r->rod; |
262 |
> |
} |
263 |
|
if (nd.pdot < .001) |
264 |
|
nd.pdot = .001; /* non-zero for dirnorm() */ |
265 |
|
multcolor(nd.mcolor, r->pcol); /* modify material color */ |
266 |
< |
transtest = 0; |
267 |
< |
transdist = r->rot; |
268 |
< |
/* get specular component */ |
269 |
< |
if ((nd.rspec = m->oargs.farg[3]) > FTINY) { |
270 |
< |
nd.specfl |= SP_REFL; |
271 |
< |
/* compute specular color */ |
272 |
< |
if (m->otype == MAT_METAL) |
273 |
< |
copycolor(nd.scolor, nd.mcolor); |
274 |
< |
else |
194 |
< |
setcolor(nd.scolor, 1.0, 1.0, 1.0); |
195 |
< |
scalecolor(nd.scolor, nd.rspec); |
196 |
< |
/* check threshold */ |
197 |
< |
if (!(nd.specfl & SP_PURE) && specthresh >= nd.rspec-FTINY) |
198 |
< |
nd.specfl |= SP_RBLT; |
199 |
< |
/* compute reflected ray */ |
200 |
< |
for (i = 0; i < 3; i++) |
201 |
< |
nd.vrefl[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i]; |
202 |
< |
if (DOT(nd.vrefl, r->ron) <= FTINY) /* penetration? */ |
203 |
< |
for (i = 0; i < 3; i++) /* safety measure */ |
204 |
< |
nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
205 |
< |
|
206 |
< |
if (!(r->crtype & SHADOW) && nd.specfl & SP_PURE) { |
207 |
< |
RAY lr; |
208 |
< |
if (rayorigin(&lr, r, REFLECTED, nd.rspec) == 0) { |
209 |
< |
VCOPY(lr.rdir, nd.vrefl); |
210 |
< |
rayvalue(&lr); |
211 |
< |
multcolor(lr.rcol, nd.scolor); |
212 |
< |
addcolor(r->rcol, lr.rcol); |
213 |
< |
} |
214 |
< |
} |
215 |
< |
} |
266 |
> |
mirtest = transtest = 0; |
267 |
> |
mirdist = transdist = r->rot; |
268 |
> |
nd.rspec = m->oargs.farg[3]; |
269 |
> |
/* compute Fresnel approx. */ |
270 |
> |
if (nd.specfl & SP_PURE && nd.rspec > FTINY) { |
271 |
> |
fest = FRESNE(r->rod); |
272 |
> |
nd.rspec += fest*(1. - nd.rspec); |
273 |
> |
} else |
274 |
> |
fest = 0.; |
275 |
|
/* compute transmission */ |
276 |
|
if (m->otype == MAT_TRANS) { |
277 |
|
nd.trans = m->oargs.farg[5]*(1.0 - nd.rspec); |
283 |
|
if (!(nd.specfl & SP_PURE) && |
284 |
|
specthresh >= nd.tspec-FTINY) |
285 |
|
nd.specfl |= SP_TBLT; |
286 |
< |
if (r->crtype & SHADOW || |
228 |
< |
DOT(r->pert,r->pert) <= FTINY*FTINY) { |
286 |
> |
if (!hastexture || r->crtype & SHADOW) { |
287 |
|
VCOPY(nd.prdir, r->rdir); |
288 |
|
transtest = 2; |
289 |
|
} else { |
298 |
|
} else |
299 |
|
nd.tdiff = nd.tspec = nd.trans = 0.0; |
300 |
|
/* transmitted ray */ |
301 |
< |
if ((nd.specfl&(SP_TRAN|SP_PURE)) == (SP_TRAN|SP_PURE)) { |
301 |
> |
if ((nd.specfl&(SP_TRAN|SP_PURE|SP_TBLT)) == (SP_TRAN|SP_PURE)) { |
302 |
|
RAY lr; |
303 |
|
if (rayorigin(&lr, r, TRANS, nd.tspec) == 0) { |
304 |
|
VCOPY(lr.rdir, nd.prdir); |
312 |
|
} else |
313 |
|
transtest = 0; |
314 |
|
|
315 |
< |
if (r->crtype & SHADOW) /* the rest is shadow */ |
316 |
< |
return; |
315 |
> |
if (r->crtype & SHADOW) { /* the rest is shadow */ |
316 |
> |
r->rt = transdist; |
317 |
> |
return(1); |
318 |
> |
} |
319 |
> |
/* get specular reflection */ |
320 |
> |
if (nd.rspec > FTINY) { |
321 |
> |
nd.specfl |= SP_REFL; |
322 |
> |
/* compute specular color */ |
323 |
> |
if (m->otype != MAT_METAL) { |
324 |
> |
setcolor(nd.scolor, nd.rspec, nd.rspec, nd.rspec); |
325 |
> |
} else if (fest > FTINY) { |
326 |
> |
d = nd.rspec*(1. - fest); |
327 |
> |
for (i = 0; i < 3; i++) |
328 |
> |
nd.scolor[i] = fest + nd.mcolor[i]*d; |
329 |
> |
} else { |
330 |
> |
copycolor(nd.scolor, nd.mcolor); |
331 |
> |
scalecolor(nd.scolor, nd.rspec); |
332 |
> |
} |
333 |
> |
/* check threshold */ |
334 |
> |
if (!(nd.specfl & SP_PURE) && specthresh >= nd.rspec-FTINY) |
335 |
> |
nd.specfl |= SP_RBLT; |
336 |
> |
/* compute reflected ray */ |
337 |
> |
for (i = 0; i < 3; i++) |
338 |
> |
nd.vrefl[i] = r->rdir[i] + 2.*nd.pdot*nd.pnorm[i]; |
339 |
> |
/* penetration? */ |
340 |
> |
if (hastexture && DOT(nd.vrefl, r->ron) <= FTINY) |
341 |
> |
for (i = 0; i < 3; i++) /* safety measure */ |
342 |
> |
nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
343 |
> |
} |
344 |
> |
/* reflected ray */ |
345 |
> |
if ((nd.specfl&(SP_REFL|SP_PURE|SP_RBLT)) == (SP_REFL|SP_PURE)) { |
346 |
> |
RAY lr; |
347 |
> |
if (rayorigin(&lr, r, REFLECTED, nd.rspec) == 0) { |
348 |
> |
VCOPY(lr.rdir, nd.vrefl); |
349 |
> |
rayvalue(&lr); |
350 |
> |
multcolor(lr.rcol, nd.scolor); |
351 |
> |
addcolor(r->rcol, lr.rcol); |
352 |
> |
if (!hastexture && nd.specfl & SP_FLAT) { |
353 |
> |
mirtest = 2.*bright(lr.rcol); |
354 |
> |
mirdist = r->rot + lr.rt; |
355 |
> |
} |
356 |
> |
} |
357 |
> |
} |
358 |
|
/* diffuse reflection */ |
359 |
|
nd.rdiff = 1.0 - nd.trans - nd.rspec; |
360 |
|
|
361 |
|
if (nd.specfl & SP_PURE && nd.rdiff <= FTINY && nd.tdiff <= FTINY) |
362 |
< |
return; /* 100% pure specular */ |
362 |
> |
return(1); /* 100% pure specular */ |
363 |
|
|
364 |
< |
if (r->ro != NULL && (r->ro->otype == OBJ_FACE || |
365 |
< |
r->ro->otype == OBJ_RING)) |
267 |
< |
nd.specfl |= SP_FLAT; |
364 |
> |
if (!(nd.specfl & SP_PURE)) |
365 |
> |
gaussamp(r, &nd); /* checks *BLT flags */ |
366 |
|
|
269 |
– |
if (nd.specfl & (SP_REFL|SP_TRAN) && !(nd.specfl & SP_PURE)) |
270 |
– |
gaussamp(r, &nd); |
271 |
– |
|
367 |
|
if (nd.rdiff > FTINY) { /* ambient from this side */ |
368 |
< |
ambient(ctmp, r); |
368 |
> |
ambient(ctmp, r, hastexture?nd.pnorm:r->ron); |
369 |
|
if (nd.specfl & SP_RBLT) |
370 |
|
scalecolor(ctmp, 1.0-nd.trans); |
371 |
|
else |
375 |
|
} |
376 |
|
if (nd.tdiff > FTINY) { /* ambient from other side */ |
377 |
|
flipsurface(r); |
378 |
< |
ambient(ctmp, r); |
378 |
> |
if (hastexture) { |
379 |
> |
FVECT bnorm; |
380 |
> |
bnorm[0] = -nd.pnorm[0]; |
381 |
> |
bnorm[1] = -nd.pnorm[1]; |
382 |
> |
bnorm[2] = -nd.pnorm[2]; |
383 |
> |
ambient(ctmp, r, bnorm); |
384 |
> |
} else |
385 |
> |
ambient(ctmp, r, r->ron); |
386 |
|
if (nd.specfl & SP_TBLT) |
387 |
|
scalecolor(ctmp, nd.trans); |
388 |
|
else |
394 |
|
/* add direct component */ |
395 |
|
direct(r, dirnorm, &nd); |
396 |
|
/* check distance */ |
397 |
< |
if (transtest > bright(r->rcol)) |
397 |
> |
d = bright(r->rcol); |
398 |
> |
if (transtest > d) |
399 |
|
r->rt = transdist; |
400 |
+ |
else if (mirtest > d) |
401 |
+ |
r->rt = mirdist; |
402 |
+ |
|
403 |
+ |
return(1); |
404 |
|
} |
405 |
|
|
406 |
|
|
407 |
< |
static |
407 |
> |
static void |
408 |
|
gaussamp(r, np) /* sample gaussian specular */ |
409 |
|
RAY *r; |
410 |
|
register NORMDAT *np; |
413 |
|
FVECT u, v, h; |
414 |
|
double rv[2]; |
415 |
|
double d, sinp, cosp; |
416 |
+ |
int niter; |
417 |
|
register int i; |
418 |
|
/* quick test */ |
419 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) != SP_REFL && |
432 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
433 |
|
rayorigin(&sr, r, SPECULAR, np->rspec) == 0) { |
434 |
|
dimlist[ndims++] = (int)np->mp; |
435 |
< |
d = urand(ilhash(dimlist,ndims)+samplendx); |
436 |
< |
multisamp(rv, 2, d); |
437 |
< |
d = 2.0*PI * rv[0]; |
438 |
< |
cosp = cos(d); |
439 |
< |
sinp = sin(d); |
440 |
< |
rv[1] = 1.0 - specjitter*rv[1]; |
441 |
< |
if (rv[1] <= FTINY) |
442 |
< |
d = 1.0; |
443 |
< |
else |
444 |
< |
d = sqrt( np->alpha2 * -log(rv[1]) ); |
445 |
< |
for (i = 0; i < 3; i++) |
446 |
< |
h[i] = np->pnorm[i] + d*(cosp*u[i] + sinp*v[i]); |
447 |
< |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
448 |
< |
for (i = 0; i < 3; i++) |
449 |
< |
sr.rdir[i] = r->rdir[i] + d*h[i]; |
450 |
< |
if (DOT(sr.rdir, r->ron) <= FTINY) |
451 |
< |
VCOPY(sr.rdir, np->vrefl); /* jitter no good */ |
452 |
< |
rayvalue(&sr); |
453 |
< |
multcolor(sr.rcol, np->scolor); |
454 |
< |
addcolor(r->rcol, sr.rcol); |
435 |
> |
for (niter = 0; niter < MAXITER; niter++) { |
436 |
> |
if (niter) |
437 |
> |
d = frandom(); |
438 |
> |
else |
439 |
> |
d = urand(ilhash(dimlist,ndims)+samplendx); |
440 |
> |
multisamp(rv, 2, d); |
441 |
> |
d = 2.0*PI * rv[0]; |
442 |
> |
cosp = tcos(d); |
443 |
> |
sinp = tsin(d); |
444 |
> |
rv[1] = 1.0 - specjitter*rv[1]; |
445 |
> |
if (rv[1] <= FTINY) |
446 |
> |
d = 1.0; |
447 |
> |
else |
448 |
> |
d = sqrt( np->alpha2 * -log(rv[1]) ); |
449 |
> |
for (i = 0; i < 3; i++) |
450 |
> |
h[i] = np->pnorm[i] + d*(cosp*u[i] + sinp*v[i]); |
451 |
> |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
452 |
> |
for (i = 0; i < 3; i++) |
453 |
> |
sr.rdir[i] = r->rdir[i] + d*h[i]; |
454 |
> |
if (DOT(sr.rdir, r->ron) > FTINY) { |
455 |
> |
rayvalue(&sr); |
456 |
> |
multcolor(sr.rcol, np->scolor); |
457 |
> |
addcolor(r->rcol, sr.rcol); |
458 |
> |
break; |
459 |
> |
} |
460 |
> |
} |
461 |
|
ndims--; |
462 |
|
} |
463 |
|
/* compute transmission */ |
464 |
|
if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
465 |
|
rayorigin(&sr, r, SPECULAR, np->tspec) == 0) { |
466 |
|
dimlist[ndims++] = (int)np->mp; |
467 |
< |
d = urand(ilhash(dimlist,ndims)+1823+samplendx); |
468 |
< |
multisamp(rv, 2, d); |
469 |
< |
d = 2.0*PI * rv[0]; |
470 |
< |
cosp = cos(d); |
471 |
< |
sinp = sin(d); |
472 |
< |
rv[1] = 1.0 - specjitter*rv[1]; |
473 |
< |
if (rv[1] <= FTINY) |
474 |
< |
d = 1.0; |
475 |
< |
else |
476 |
< |
d = sqrt( -log(rv[1]) * np->alpha2 ); |
477 |
< |
for (i = 0; i < 3; i++) |
478 |
< |
sr.rdir[i] = np->prdir[i] + d*(cosp*u[i] + sinp*v[i]); |
479 |
< |
if (DOT(sr.rdir, r->ron) < -FTINY) |
480 |
< |
normalize(sr.rdir); /* OK, normalize */ |
481 |
< |
else |
482 |
< |
VCOPY(sr.rdir, np->prdir); /* else no jitter */ |
483 |
< |
rayvalue(&sr); |
484 |
< |
scalecolor(sr.rcol, np->tspec); |
485 |
< |
multcolor(sr.rcol, np->mcolor); /* modified by color */ |
486 |
< |
addcolor(r->rcol, sr.rcol); |
467 |
> |
for (niter = 0; niter < MAXITER; niter++) { |
468 |
> |
if (niter) |
469 |
> |
d = frandom(); |
470 |
> |
else |
471 |
> |
d = urand(ilhash(dimlist,ndims)+1823+samplendx); |
472 |
> |
multisamp(rv, 2, d); |
473 |
> |
d = 2.0*PI * rv[0]; |
474 |
> |
cosp = tcos(d); |
475 |
> |
sinp = tsin(d); |
476 |
> |
rv[1] = 1.0 - specjitter*rv[1]; |
477 |
> |
if (rv[1] <= FTINY) |
478 |
> |
d = 1.0; |
479 |
> |
else |
480 |
> |
d = sqrt( np->alpha2 * -log(rv[1]) ); |
481 |
> |
for (i = 0; i < 3; i++) |
482 |
> |
sr.rdir[i] = np->prdir[i] + d*(cosp*u[i] + sinp*v[i]); |
483 |
> |
if (DOT(sr.rdir, r->ron) < -FTINY) { |
484 |
> |
normalize(sr.rdir); /* OK, normalize */ |
485 |
> |
rayvalue(&sr); |
486 |
> |
scalecolor(sr.rcol, np->tspec); |
487 |
> |
multcolor(sr.rcol, np->mcolor); /* modified */ |
488 |
> |
addcolor(r->rcol, sr.rcol); |
489 |
> |
break; |
490 |
> |
} |
491 |
> |
} |
492 |
|
ndims--; |
493 |
|
} |
494 |
|
} |