41 |
|
#define SP_FLAT 04 /* reflecting surface is flat */ |
42 |
|
#define SP_RBLT 010 /* reflection below sample threshold */ |
43 |
|
#define SP_TBLT 020 /* transmission below threshold */ |
44 |
– |
#define SP_BADU 040 /* bad u direction calculation */ |
44 |
|
|
45 |
|
typedef struct { |
46 |
|
OBJREC *mp; /* material pointer */ |
60 |
|
double pdot; /* perturbed dot product */ |
61 |
|
} ANISODAT; /* anisotropic material data */ |
62 |
|
|
63 |
< |
static void getacoords(RAY *r, ANISODAT *np); |
64 |
< |
static void agaussamp(RAY *r, ANISODAT *np); |
63 |
> |
static void getacoords(ANISODAT *np); |
64 |
> |
static void agaussamp(ANISODAT *np); |
65 |
|
|
66 |
|
|
67 |
|
static void |
97 |
|
scalecolor(ctmp, dtmp); |
98 |
|
addcolor(cval, ctmp); |
99 |
|
} |
100 |
< |
if (ldot > FTINY && (np->specfl&(SP_REFL|SP_BADU)) == SP_REFL) { |
100 |
> |
if (ldot > FTINY && np->specfl&SP_REFL) { |
101 |
|
/* |
102 |
|
* Compute specular reflection coefficient using |
103 |
|
* anisotropic Gaussian distribution model. |
139 |
|
scalecolor(ctmp, dtmp); |
140 |
|
addcolor(cval, ctmp); |
141 |
|
} |
142 |
< |
if (ldot < -FTINY && (np->specfl&(SP_TRAN|SP_BADU)) == SP_TRAN) { |
142 |
> |
if (ldot < -FTINY && np->specfl&SP_TRAN) { |
143 |
|
/* |
144 |
|
* Compute specular transmission. Specular transmission |
145 |
|
* is always modified by material color. |
193 |
|
objerror(m, USER, "bad number of real arguments"); |
194 |
|
/* check for back side */ |
195 |
|
if (r->rod < 0.0) { |
196 |
< |
if (!backvis && m->otype != MAT_TRANS2) { |
196 |
> |
if (!backvis) { |
197 |
|
raytrans(r); |
198 |
|
return(1); |
199 |
|
} |
265 |
|
if (r->ro != NULL && isflat(r->ro->otype)) |
266 |
|
nd.specfl |= SP_FLAT; |
267 |
|
|
268 |
< |
getacoords(r, &nd); /* set up coordinates */ |
268 |
> |
getacoords(&nd); /* set up coordinates */ |
269 |
|
|
270 |
< |
if (nd.specfl & (SP_REFL|SP_TRAN) && !(nd.specfl & SP_BADU)) |
271 |
< |
agaussamp(r, &nd); |
270 |
> |
if (nd.specfl & (SP_REFL|SP_TRAN)) |
271 |
> |
agaussamp(&nd); |
272 |
|
|
273 |
|
if (nd.rdiff > FTINY) { /* ambient from this side */ |
274 |
|
copycolor(ctmp, nd.mcolor); /* modified by material color */ |
303 |
|
|
304 |
|
static void |
305 |
|
getacoords( /* set up coordinate system */ |
307 |
– |
RAY *r, |
306 |
|
ANISODAT *np |
307 |
|
) |
308 |
|
{ |
310 |
|
int i; |
311 |
|
|
312 |
|
mf = getfunc(np->mp, 3, 0x7, 1); |
313 |
< |
setfunc(np->mp, r); |
313 |
> |
setfunc(np->mp, np->rp); |
314 |
|
errno = 0; |
315 |
|
for (i = 0; i < 3; i++) |
316 |
|
np->u[i] = evalue(mf->ep[i]); |
317 |
< |
if ((errno == EDOM) | (errno == ERANGE)) { |
318 |
< |
objerror(np->mp, WARNING, "compute error"); |
321 |
< |
np->specfl |= SP_BADU; |
322 |
< |
return; |
323 |
< |
} |
317 |
> |
if ((errno == EDOM) | (errno == ERANGE)) |
318 |
> |
np->u[0] = np->u[1] = np->u[2] = 0.0; |
319 |
|
if (mf->fxp != &unitxf) |
320 |
|
multv3(np->u, np->u, mf->fxp->xfm); |
321 |
|
fcross(np->v, np->pnorm, np->u); |
322 |
|
if (normalize(np->v) == 0.0) { |
323 |
< |
objerror(np->mp, WARNING, "illegal orientation vector"); |
324 |
< |
np->specfl |= SP_BADU; |
325 |
< |
return; |
326 |
< |
} |
327 |
< |
fcross(np->u, np->v, np->pnorm); |
323 |
> |
if (fabs(np->u_alpha - np->v_alpha) > 0.001) |
324 |
> |
objerror(np->mp, WARNING, "illegal orientation vector"); |
325 |
> |
getperpendicular(np->u, np->pnorm); /* punting */ |
326 |
> |
fcross(np->v, np->pnorm, np->u); |
327 |
> |
np->u_alpha = np->v_alpha = sqrt( 0.5 * |
328 |
> |
(np->u_alpha*np->u_alpha + np->v_alpha*np->v_alpha) ); |
329 |
> |
} else |
330 |
> |
fcross(np->u, np->v, np->pnorm); |
331 |
|
} |
332 |
|
|
333 |
|
|
334 |
|
static void |
335 |
|
agaussamp( /* sample anisotropic Gaussian specular */ |
338 |
– |
RAY *r, |
336 |
|
ANISODAT *np |
337 |
|
) |
338 |
|
{ |
345 |
|
int i; |
346 |
|
/* compute reflection */ |
347 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
348 |
< |
rayorigin(&sr, SPECULAR, r, np->scolor) == 0) { |
348 |
> |
rayorigin(&sr, SPECULAR, np->rp, np->scolor) == 0) { |
349 |
|
nstarget = 1; |
350 |
|
if (specjitter > 1.5) { /* multiple samples? */ |
351 |
< |
nstarget = specjitter*r->rweight + .5; |
351 |
> |
nstarget = specjitter*np->rp->rweight + .5; |
352 |
|
if (sr.rweight <= minweight*nstarget) |
353 |
|
nstarget = sr.rweight/minweight; |
354 |
|
if (nstarget > 1) { |
385 |
|
for (i = 0; i < 3; i++) |
386 |
|
h[i] = np->pnorm[i] + |
387 |
|
d*(cosp*np->u[i] + sinp*np->v[i]); |
388 |
< |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
389 |
< |
VSUM(sr.rdir, r->rdir, h, d); |
388 |
> |
d = -2.0 * DOT(h, np->rp->rdir) / (1.0 + d*d); |
389 |
> |
VSUM(sr.rdir, np->rp->rdir, h, d); |
390 |
|
/* sample rejection test */ |
391 |
< |
if ((d = DOT(sr.rdir, r->ron)) <= FTINY) |
391 |
> |
if ((d = DOT(sr.rdir, np->rp->ron)) <= FTINY) |
392 |
|
continue; |
393 |
|
checknorm(sr.rdir); |
394 |
|
if (nstarget > 1) { /* W-G-M-D adjustment */ |
395 |
|
if (nstaken) rayclear(&sr); |
396 |
|
rayvalue(&sr); |
397 |
< |
d = 2./(1. + r->rod/d); |
397 |
> |
d = 2./(1. + np->rp->rod/d); |
398 |
|
scalecolor(sr.rcol, d); |
399 |
|
addcolor(scol, sr.rcol); |
400 |
|
} else { |
401 |
|
rayvalue(&sr); |
402 |
|
multcolor(sr.rcol, sr.rcoef); |
403 |
< |
addcolor(r->rcol, sr.rcol); |
403 |
> |
addcolor(np->rp->rcol, sr.rcol); |
404 |
|
} |
405 |
|
++nstaken; |
406 |
|
} |
408 |
|
multcolor(scol, sr.rcoef); |
409 |
|
d = (double)nstarget/ntrials; |
410 |
|
scalecolor(scol, d); |
411 |
< |
addcolor(r->rcol, scol); |
411 |
> |
addcolor(np->rp->rcol, scol); |
412 |
|
} |
413 |
|
ndims--; |
414 |
|
} |
416 |
|
copycolor(sr.rcoef, np->mcolor); /* modify by material color */ |
417 |
|
scalecolor(sr.rcoef, np->tspec); |
418 |
|
if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
419 |
< |
rayorigin(&sr, SPECULAR, r, sr.rcoef) == 0) { |
419 |
> |
rayorigin(&sr, SPECULAR, np->rp, sr.rcoef) == 0) { |
420 |
|
nstarget = 1; |
421 |
|
if (specjitter > 1.5) { /* multiple samples? */ |
422 |
< |
nstarget = specjitter*r->rweight + .5; |
422 |
> |
nstarget = specjitter*np->rp->rweight + .5; |
423 |
|
if (sr.rweight <= minweight*nstarget) |
424 |
|
nstarget = sr.rweight/minweight; |
425 |
|
if (nstarget > 1) { |
455 |
|
for (i = 0; i < 3; i++) |
456 |
|
sr.rdir[i] = np->prdir[i] + |
457 |
|
d*(cosp*np->u[i] + sinp*np->v[i]); |
458 |
< |
if (DOT(sr.rdir, r->ron) >= -FTINY) |
458 |
> |
if (DOT(sr.rdir, np->rp->ron) >= -FTINY) |
459 |
|
continue; |
460 |
|
normalize(sr.rdir); /* OK, normalize */ |
461 |
|
if (nstaken) /* multi-sampling */ |
462 |
|
rayclear(&sr); |
463 |
|
rayvalue(&sr); |
464 |
|
multcolor(sr.rcol, sr.rcoef); |
465 |
< |
addcolor(r->rcol, sr.rcol); |
465 |
> |
addcolor(np->rp->rcol, sr.rcol); |
466 |
|
++nstaken; |
467 |
|
} |
468 |
|
ndims--; |