| 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--; |