| 14 |
|
#include "source.h" |
| 15 |
|
#include "func.h" |
| 16 |
|
#include "random.h" |
| 17 |
+ |
#include "pmapmat.h" |
| 18 |
|
|
| 19 |
|
#ifndef MAXITER |
| 20 |
|
#define MAXITER 10 /* maximum # specular ray attempts */ |
| 22 |
|
|
| 23 |
|
/* |
| 24 |
|
* This routine implements the anisotropic Gaussian |
| 25 |
< |
* model described by Ward in Siggraph `92 article. |
| 25 |
> |
* model described by Ward in Siggraph `92 article, updated with |
| 26 |
> |
* normalization and sampling adjustments due to Geisler-Moroder and Duer. |
| 27 |
|
* We orient the surface towards the incoming ray, so a single |
| 28 |
|
* surface can be used to represent an infinitely thin object. |
| 29 |
|
* |
| 30 |
|
* Arguments for MAT_PLASTIC2 and MAT_METAL2 are: |
| 31 |
|
* 4+ ux uy uz funcfile [transform...] |
| 32 |
|
* 0 |
| 33 |
< |
* 6 red grn blu specular-frac. u-facet-slope v-facet-slope |
| 33 |
> |
* 6 red grn blu specular-frac. u-rough v-rough |
| 34 |
|
* |
| 35 |
|
* Real arguments for MAT_TRANS2 are: |
| 36 |
|
* 8 red grn blu rspec u-rough v-rough trans tspec |
| 42 |
|
#define SP_FLAT 04 /* reflecting surface is flat */ |
| 43 |
|
#define SP_RBLT 010 /* reflection below sample threshold */ |
| 44 |
|
#define SP_TBLT 020 /* transmission below threshold */ |
| 43 |
– |
#define SP_BADU 040 /* bad u direction calculation */ |
| 45 |
|
|
| 46 |
|
typedef struct { |
| 47 |
|
OBJREC *mp; /* material pointer */ |
| 48 |
|
RAY *rp; /* ray pointer */ |
| 49 |
|
short specfl; /* specularity flags, defined above */ |
| 50 |
< |
COLOR mcolor; /* color of this material */ |
| 51 |
< |
COLOR scolor; /* color of specular component */ |
| 51 |
< |
FVECT vrefl; /* vector in reflected direction */ |
| 50 |
> |
SCOLOR mcolor; /* color of this material */ |
| 51 |
> |
SCOLOR scolor; /* color of specular component */ |
| 52 |
|
FVECT prdir; /* vector in transmitted direction */ |
| 53 |
|
FVECT u, v; /* u and v vectors orienting anisotropy */ |
| 54 |
|
double u_alpha; /* u roughness */ |
| 60 |
|
double pdot; /* perturbed dot product */ |
| 61 |
|
} ANISODAT; /* anisotropic material data */ |
| 62 |
|
|
| 63 |
< |
static srcdirf_t diraniso; |
| 64 |
< |
static void getacoords(RAY *r, ANISODAT *np); |
| 65 |
< |
static void agaussamp(RAY *r, ANISODAT *np); |
| 63 |
> |
static void getacoords(ANISODAT *np); |
| 64 |
> |
static void agaussamp(ANISODAT *np); |
| 65 |
|
|
| 66 |
|
|
| 67 |
|
static void |
| 68 |
|
diraniso( /* compute source contribution */ |
| 69 |
< |
COLOR cval, /* returned coefficient */ |
| 70 |
< |
void *nnp, /* material data */ |
| 69 |
> |
SCOLOR scval, /* returned coefficient */ |
| 70 |
> |
void *nnp, /* material data */ |
| 71 |
|
FVECT ldir, /* light source direction */ |
| 72 |
|
double omega /* light source size */ |
| 73 |
|
) |
| 74 |
|
{ |
| 75 |
< |
register ANISODAT *np = nnp; |
| 75 |
> |
ANISODAT *np = nnp; |
| 76 |
|
double ldot; |
| 77 |
|
double dtmp, dtmp1, dtmp2; |
| 78 |
|
FVECT h; |
| 79 |
|
double au2, av2; |
| 80 |
< |
COLOR ctmp; |
| 80 |
> |
SCOLOR sctmp; |
| 81 |
|
|
| 82 |
< |
setcolor(cval, 0.0, 0.0, 0.0); |
| 82 |
> |
scolorblack(scval); |
| 83 |
|
|
| 84 |
|
ldot = DOT(np->pnorm, ldir); |
| 85 |
|
|
| 86 |
|
if (ldot < 0.0 ? np->trans <= FTINY : np->trans >= 1.0-FTINY) |
| 87 |
|
return; /* wrong side */ |
| 88 |
|
|
| 89 |
< |
if (ldot > FTINY && np->rdiff > FTINY) { |
| 89 |
> |
if ((ldot > FTINY) & (np->rdiff > FTINY)) { |
| 90 |
|
/* |
| 91 |
|
* Compute and add diffuse reflected component to returned |
| 92 |
|
* color. The diffuse reflected component will always be |
| 93 |
|
* modified by the color of the material. |
| 94 |
|
*/ |
| 95 |
< |
copycolor(ctmp, np->mcolor); |
| 95 |
> |
copyscolor(sctmp, np->mcolor); |
| 96 |
|
dtmp = ldot * omega * np->rdiff * (1.0/PI); |
| 97 |
< |
scalecolor(ctmp, dtmp); |
| 98 |
< |
addcolor(cval, ctmp); |
| 97 |
> |
scalescolor(sctmp, dtmp); |
| 98 |
> |
saddscolor(scval, sctmp); |
| 99 |
|
} |
| 100 |
< |
if (ldot > FTINY && (np->specfl&(SP_REFL|SP_BADU)) == SP_REFL) { |
| 100 |
> |
|
| 101 |
> |
if ((ldot < -FTINY) & (np->tdiff > FTINY)) { |
| 102 |
|
/* |
| 103 |
+ |
* Compute diffuse transmission. |
| 104 |
+ |
*/ |
| 105 |
+ |
copyscolor(sctmp, np->mcolor); |
| 106 |
+ |
dtmp = -ldot * omega * np->tdiff * (1.0/PI); |
| 107 |
+ |
scalescolor(sctmp, dtmp); |
| 108 |
+ |
saddscolor(scval, sctmp); |
| 109 |
+ |
} |
| 110 |
+ |
|
| 111 |
+ |
if (ambRayInPmap(np->rp)) |
| 112 |
+ |
return; /* specular accounted for in photon map */ |
| 113 |
+ |
|
| 114 |
+ |
if (ldot > FTINY && np->specfl&SP_REFL) { |
| 115 |
+ |
/* |
| 116 |
|
* Compute specular reflection coefficient using |
| 117 |
|
* anisotropic Gaussian distribution model. |
| 118 |
|
*/ |
| 124 |
|
au2 += np->u_alpha*np->u_alpha; |
| 125 |
|
av2 += np->v_alpha*np->v_alpha; |
| 126 |
|
/* half vector */ |
| 127 |
< |
h[0] = ldir[0] - np->rp->rdir[0]; |
| 115 |
< |
h[1] = ldir[1] - np->rp->rdir[1]; |
| 116 |
< |
h[2] = ldir[2] - np->rp->rdir[2]; |
| 127 |
> |
VSUB(h, ldir, np->rp->rdir); |
| 128 |
|
/* ellipse */ |
| 129 |
|
dtmp1 = DOT(np->u, h); |
| 130 |
|
dtmp1 *= dtmp1 / au2; |
| 138 |
|
(PI * dtmp*dtmp * sqrt(au2*av2)); |
| 139 |
|
/* worth using? */ |
| 140 |
|
if (dtmp > FTINY) { |
| 141 |
< |
copycolor(ctmp, np->scolor); |
| 141 |
> |
copyscolor(sctmp, np->scolor); |
| 142 |
|
dtmp *= ldot * omega; |
| 143 |
< |
scalecolor(ctmp, dtmp); |
| 144 |
< |
addcolor(cval, ctmp); |
| 143 |
> |
scalescolor(sctmp, dtmp); |
| 144 |
> |
saddscolor(scval, sctmp); |
| 145 |
|
} |
| 146 |
|
} |
| 147 |
< |
if (ldot < -FTINY && np->tdiff > FTINY) { |
| 147 |
> |
|
| 148 |
> |
if (ldot < -FTINY && np->specfl&SP_TRAN) { |
| 149 |
|
/* |
| 138 |
– |
* Compute diffuse transmission. |
| 139 |
– |
*/ |
| 140 |
– |
copycolor(ctmp, np->mcolor); |
| 141 |
– |
dtmp = -ldot * omega * np->tdiff * (1.0/PI); |
| 142 |
– |
scalecolor(ctmp, dtmp); |
| 143 |
– |
addcolor(cval, ctmp); |
| 144 |
– |
} |
| 145 |
– |
if (ldot < -FTINY && (np->specfl&(SP_TRAN|SP_BADU)) == SP_TRAN) { |
| 146 |
– |
/* |
| 150 |
|
* Compute specular transmission. Specular transmission |
| 151 |
|
* is always modified by material color. |
| 152 |
|
*/ |
| 155 |
|
au2 += np->u_alpha*np->u_alpha; |
| 156 |
|
av2 += np->v_alpha*np->v_alpha; |
| 157 |
|
/* "half vector" */ |
| 158 |
< |
h[0] = ldir[0] - np->prdir[0]; |
| 156 |
< |
h[1] = ldir[1] - np->prdir[1]; |
| 157 |
< |
h[2] = ldir[2] - np->prdir[2]; |
| 158 |
> |
VSUB(h, ldir, np->prdir); |
| 159 |
|
dtmp = DOT(h,h); |
| 160 |
|
if (dtmp > FTINY*FTINY) { |
| 161 |
|
dtmp1 = DOT(h,np->pnorm); |
| 162 |
|
dtmp = 1.0 - dtmp1*dtmp1/dtmp; |
| 163 |
< |
if (dtmp > FTINY*FTINY) { |
| 164 |
< |
dtmp1 = DOT(h,np->u); |
| 165 |
< |
dtmp1 *= dtmp1 / au2; |
| 166 |
< |
dtmp2 = DOT(h,np->v); |
| 167 |
< |
dtmp2 *= dtmp2 / av2; |
| 168 |
< |
dtmp = (dtmp1 + dtmp2) / dtmp; |
| 169 |
< |
} |
| 163 |
> |
} |
| 164 |
> |
if (dtmp > FTINY*FTINY) { |
| 165 |
> |
dtmp1 = DOT(h,np->u); |
| 166 |
> |
dtmp1 *= dtmp1 / au2; |
| 167 |
> |
dtmp2 = DOT(h,np->v); |
| 168 |
> |
dtmp2 *= dtmp2 / av2; |
| 169 |
> |
dtmp = (dtmp1 + dtmp2) / dtmp; |
| 170 |
> |
dtmp = exp(-dtmp); |
| 171 |
|
} else |
| 172 |
< |
dtmp = 0.0; |
| 172 |
> |
dtmp = 1.0; |
| 173 |
|
/* Gaussian */ |
| 174 |
< |
dtmp = exp(-dtmp) * (1.0/PI) * sqrt(-ldot/(np->pdot*au2*av2)); |
| 174 |
> |
dtmp *= (1.0/PI) * sqrt(-ldot/(np->pdot*au2*av2)); |
| 175 |
|
/* worth using? */ |
| 176 |
|
if (dtmp > FTINY) { |
| 177 |
< |
copycolor(ctmp, np->mcolor); |
| 177 |
> |
copyscolor(sctmp, np->mcolor); |
| 178 |
|
dtmp *= np->tspec * omega; |
| 179 |
< |
scalecolor(ctmp, dtmp); |
| 180 |
< |
addcolor(cval, ctmp); |
| 179 |
> |
scalescolor(sctmp, dtmp); |
| 180 |
> |
saddscolor(scval, sctmp); |
| 181 |
|
} |
| 182 |
|
} |
| 183 |
|
} |
| 184 |
|
|
| 185 |
|
|
| 186 |
< |
extern int |
| 186 |
> |
int |
| 187 |
|
m_aniso( /* shade ray that hit something anisotropic */ |
| 188 |
< |
register OBJREC *m, |
| 189 |
< |
register RAY *r |
| 188 |
> |
OBJREC *m, |
| 189 |
> |
RAY *r |
| 190 |
|
) |
| 191 |
|
{ |
| 192 |
|
ANISODAT nd; |
| 193 |
< |
COLOR ctmp; |
| 194 |
< |
register int i; |
| 193 |
> |
SCOLOR sctmp; |
| 194 |
> |
int i; |
| 195 |
|
/* easy shadow test */ |
| 196 |
|
if (r->crtype & SHADOW) |
| 197 |
|
return(1); |
| 200 |
|
objerror(m, USER, "bad number of real arguments"); |
| 201 |
|
/* check for back side */ |
| 202 |
|
if (r->rod < 0.0) { |
| 203 |
< |
if (!backvis && m->otype != MAT_TRANS2) { |
| 203 |
> |
if (!backvis) { |
| 204 |
|
raytrans(r); |
| 205 |
|
return(1); |
| 206 |
|
} |
| 211 |
|
/* get material color */ |
| 212 |
|
nd.mp = m; |
| 213 |
|
nd.rp = r; |
| 214 |
< |
setcolor(nd.mcolor, m->oargs.farg[0], |
| 214 |
> |
setscolor(nd.mcolor, m->oargs.farg[0], |
| 215 |
|
m->oargs.farg[1], |
| 216 |
|
m->oargs.farg[2]); |
| 217 |
|
/* get roughness */ |
| 218 |
|
nd.specfl = 0; |
| 219 |
|
nd.u_alpha = m->oargs.farg[4]; |
| 220 |
|
nd.v_alpha = m->oargs.farg[5]; |
| 221 |
< |
if (nd.u_alpha <= FTINY || nd.v_alpha <= FTINY) |
| 221 |
> |
if ((nd.u_alpha <= FTINY) | (nd.v_alpha <= FTINY)) |
| 222 |
|
objerror(m, USER, "roughness too small"); |
| 223 |
|
|
| 224 |
|
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
| 225 |
|
if (nd.pdot < .001) |
| 226 |
|
nd.pdot = .001; /* non-zero for diraniso() */ |
| 227 |
< |
multcolor(nd.mcolor, r->pcol); /* modify material color */ |
| 227 |
> |
smultscolor(nd.mcolor, r->pcol); /* modify material color */ |
| 228 |
|
/* get specular component */ |
| 229 |
|
if ((nd.rspec = m->oargs.farg[3]) > FTINY) { |
| 230 |
|
nd.specfl |= SP_REFL; |
| 231 |
|
/* compute specular color */ |
| 232 |
|
if (m->otype == MAT_METAL2) |
| 233 |
< |
copycolor(nd.scolor, nd.mcolor); |
| 233 |
> |
copyscolor(nd.scolor, nd.mcolor); |
| 234 |
|
else |
| 235 |
< |
setcolor(nd.scolor, 1.0, 1.0, 1.0); |
| 236 |
< |
scalecolor(nd.scolor, nd.rspec); |
| 235 |
> |
setscolor(nd.scolor, 1.0, 1.0, 1.0); |
| 236 |
> |
scalescolor(nd.scolor, nd.rspec); |
| 237 |
|
/* check threshold */ |
| 238 |
|
if (specthresh >= nd.rspec-FTINY) |
| 239 |
|
nd.specfl |= SP_RBLT; |
| 238 |
– |
/* compute refl. direction */ |
| 239 |
– |
VSUM(nd.vrefl, r->rdir, nd.pnorm, 2.0*nd.pdot); |
| 240 |
– |
if (DOT(nd.vrefl, r->ron) <= FTINY) /* penetration? */ |
| 241 |
– |
VSUM(nd.vrefl, r->rdir, r->ron, 2.0*r->rod); |
| 240 |
|
} |
| 241 |
|
/* compute transmission */ |
| 242 |
|
if (m->otype == MAT_TRANS2) { |
| 268 |
|
if (r->ro != NULL && isflat(r->ro->otype)) |
| 269 |
|
nd.specfl |= SP_FLAT; |
| 270 |
|
|
| 271 |
< |
getacoords(r, &nd); /* set up coordinates */ |
| 271 |
> |
getacoords(&nd); /* set up coordinates */ |
| 272 |
|
|
| 273 |
< |
if (nd.specfl & (SP_REFL|SP_TRAN) && !(nd.specfl & SP_BADU)) |
| 274 |
< |
agaussamp(r, &nd); |
| 273 |
> |
if (nd.specfl & (SP_REFL|SP_TRAN)) |
| 274 |
> |
agaussamp(&nd); |
| 275 |
|
|
| 276 |
|
if (nd.rdiff > FTINY) { /* ambient from this side */ |
| 277 |
< |
copycolor(ctmp, nd.mcolor); /* modified by material color */ |
| 278 |
< |
scalecolor(ctmp, nd.rdiff); |
| 277 |
> |
copyscolor(sctmp, nd.mcolor); /* modified by material color */ |
| 278 |
> |
scalescolor(sctmp, nd.rdiff); |
| 279 |
|
if (nd.specfl & SP_RBLT) /* add in specular as well? */ |
| 280 |
< |
addcolor(ctmp, nd.scolor); |
| 281 |
< |
multambient(ctmp, r, nd.pnorm); |
| 282 |
< |
addcolor(r->rcol, ctmp); /* add to returned color */ |
| 280 |
> |
saddscolor(sctmp, nd.scolor); |
| 281 |
> |
multambient(sctmp, r, nd.pnorm); |
| 282 |
> |
saddscolor(r->rcol, sctmp); /* add to returned color */ |
| 283 |
|
} |
| 284 |
+ |
|
| 285 |
|
if (nd.tdiff > FTINY) { /* ambient from other side */ |
| 286 |
|
FVECT bnorm; |
| 288 |
– |
|
| 289 |
– |
flipsurface(r); |
| 287 |
|
bnorm[0] = -nd.pnorm[0]; |
| 288 |
|
bnorm[1] = -nd.pnorm[1]; |
| 289 |
|
bnorm[2] = -nd.pnorm[2]; |
| 290 |
< |
copycolor(ctmp, nd.mcolor); /* modified by color */ |
| 291 |
< |
if (nd.specfl & SP_TBLT) |
| 292 |
< |
scalecolor(ctmp, nd.trans); |
| 293 |
< |
else |
| 294 |
< |
scalecolor(ctmp, nd.tdiff); |
| 295 |
< |
multambient(ctmp, r, bnorm); |
| 296 |
< |
addcolor(r->rcol, ctmp); |
| 297 |
< |
flipsurface(r); |
| 290 |
> |
copyscolor(sctmp, nd.mcolor); /* modified by color */ |
| 291 |
> |
if (nd.specfl & SP_TBLT) { |
| 292 |
> |
scalescolor(sctmp, nd.trans); |
| 293 |
> |
} else { |
| 294 |
> |
scalescolor(sctmp, nd.tdiff); |
| 295 |
> |
} |
| 296 |
> |
multambient(sctmp, r, bnorm); |
| 297 |
> |
saddscolor(r->rcol, sctmp); |
| 298 |
|
} |
| 299 |
|
/* add direct component */ |
| 300 |
|
direct(r, diraniso, &nd); |
| 302 |
|
return(1); |
| 303 |
|
} |
| 304 |
|
|
| 308 |
– |
|
| 305 |
|
static void |
| 306 |
|
getacoords( /* set up coordinate system */ |
| 307 |
< |
RAY *r, |
| 312 |
< |
register ANISODAT *np |
| 307 |
> |
ANISODAT *np |
| 308 |
|
) |
| 309 |
|
{ |
| 310 |
< |
register MFUNC *mf; |
| 311 |
< |
register int i; |
| 310 |
> |
MFUNC *mf; |
| 311 |
> |
int i; |
| 312 |
|
|
| 313 |
|
mf = getfunc(np->mp, 3, 0x7, 1); |
| 314 |
< |
setfunc(np->mp, r); |
| 314 |
> |
setfunc(np->mp, np->rp); |
| 315 |
|
errno = 0; |
| 316 |
|
for (i = 0; i < 3; i++) |
| 317 |
|
np->u[i] = evalue(mf->ep[i]); |
| 318 |
< |
if (errno == EDOM || errno == ERANGE) { |
| 319 |
< |
objerror(np->mp, WARNING, "compute error"); |
| 320 |
< |
np->specfl |= SP_BADU; |
| 326 |
< |
return; |
| 327 |
< |
} |
| 328 |
< |
if (mf->fxp != &unitxf) |
| 318 |
> |
if ((errno == EDOM) | (errno == ERANGE)) |
| 319 |
> |
np->u[0] = np->u[1] = np->u[2] = 0.0; |
| 320 |
> |
else if (mf->fxp != &unitxf) |
| 321 |
|
multv3(np->u, np->u, mf->fxp->xfm); |
| 322 |
|
fcross(np->v, np->pnorm, np->u); |
| 323 |
|
if (normalize(np->v) == 0.0) { |
| 324 |
< |
objerror(np->mp, WARNING, "illegal orientation vector"); |
| 325 |
< |
np->specfl |= SP_BADU; |
| 326 |
< |
return; |
| 327 |
< |
} |
| 328 |
< |
fcross(np->u, np->v, np->pnorm); |
| 324 |
> |
if (fabs(np->u_alpha - np->v_alpha) > 0.001) |
| 325 |
> |
objerror(np->mp, WARNING, "illegal orientation vector"); |
| 326 |
> |
getperpendicular(np->u, np->pnorm, 1); /* punting */ |
| 327 |
> |
fcross(np->v, np->pnorm, np->u); |
| 328 |
> |
np->u_alpha = np->v_alpha = sqrt( 0.5 * |
| 329 |
> |
(np->u_alpha*np->u_alpha + np->v_alpha*np->v_alpha) ); |
| 330 |
> |
} else |
| 331 |
> |
fcross(np->u, np->v, np->pnorm); |
| 332 |
|
} |
| 333 |
|
|
| 334 |
|
|
| 335 |
|
static void |
| 336 |
|
agaussamp( /* sample anisotropic Gaussian specular */ |
| 337 |
< |
RAY *r, |
| 343 |
< |
register ANISODAT *np |
| 337 |
> |
ANISODAT *np |
| 338 |
|
) |
| 339 |
|
{ |
| 340 |
|
RAY sr; |
| 341 |
|
FVECT h; |
| 342 |
|
double rv[2]; |
| 343 |
|
double d, sinp, cosp; |
| 350 |
– |
COLOR scol; |
| 344 |
|
int maxiter, ntrials, nstarget, nstaken; |
| 345 |
< |
register int i; |
| 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, RSPECULAR, np->rp, np->scolor) == 0) { |
| 349 |
> |
SCOLOR scol; |
| 350 |
|
nstarget = 1; |
| 351 |
|
if (specjitter > 1.5) { /* multiple samples? */ |
| 352 |
< |
nstarget = specjitter*r->rweight + .5; |
| 352 |
> |
nstarget = specjitter*np->rp->rweight + .5; |
| 353 |
|
if (sr.rweight <= minweight*nstarget) |
| 354 |
|
nstarget = sr.rweight/minweight; |
| 355 |
|
if (nstarget > 1) { |
| 356 |
|
d = 1./nstarget; |
| 357 |
< |
scalecolor(sr.rcoef, d); |
| 357 |
> |
scalescolor(sr.rcoef, d); |
| 358 |
|
sr.rweight *= d; |
| 359 |
|
} else |
| 360 |
|
nstarget = 1; |
| 361 |
|
} |
| 362 |
< |
setcolor(scol, 0., 0., 0.); |
| 362 |
> |
scolorblack(scol); |
| 363 |
|
dimlist[ndims++] = (int)(size_t)np->mp; |
| 364 |
|
maxiter = MAXITER*nstarget; |
| 365 |
< |
for (nstaken = ntrials = 0; nstaken < nstarget && |
| 366 |
< |
ntrials < maxiter; ntrials++) { |
| 365 |
> |
for (nstaken = ntrials = 0; (nstaken < nstarget) & |
| 366 |
> |
(ntrials < maxiter); ntrials++) { |
| 367 |
|
if (ntrials) |
| 368 |
|
d = frandom(); |
| 369 |
|
else |
| 377 |
|
sinp *= d; |
| 378 |
|
if ((0. <= specjitter) & (specjitter < 1.)) |
| 379 |
|
rv[1] = 1.0 - specjitter*rv[1]; |
| 380 |
< |
if (rv[1] <= FTINY) |
| 387 |
< |
d = 1.0; |
| 388 |
< |
else |
| 389 |
< |
d = sqrt(-log(rv[1]) / |
| 380 |
> |
d = (rv[1] <= FTINY) ? 1.0 : sqrt( -log(rv[1]) / |
| 381 |
|
(cosp*cosp/(np->u_alpha*np->u_alpha) + |
| 382 |
< |
sinp*sinp/(np->v_alpha*np->v_alpha))); |
| 382 |
> |
sinp*sinp/(np->v_alpha*np->v_alpha)) ); |
| 383 |
|
for (i = 0; i < 3; i++) |
| 384 |
|
h[i] = np->pnorm[i] + |
| 385 |
|
d*(cosp*np->u[i] + sinp*np->v[i]); |
| 386 |
< |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
| 387 |
< |
VSUM(sr.rdir, r->rdir, h, d); |
| 386 |
> |
d = -2.0 * DOT(h, np->rp->rdir) / (1.0 + d*d); |
| 387 |
> |
VSUM(sr.rdir, np->rp->rdir, h, d); |
| 388 |
|
/* sample rejection test */ |
| 389 |
< |
if ((d = DOT(sr.rdir, r->ron)) <= FTINY) |
| 389 |
> |
if ((d = DOT(sr.rdir, np->rp->ron)) <= FTINY) |
| 390 |
|
continue; |
| 391 |
|
checknorm(sr.rdir); |
| 392 |
|
if (nstarget > 1) { /* W-G-M-D adjustment */ |
| 393 |
|
if (nstaken) rayclear(&sr); |
| 394 |
|
rayvalue(&sr); |
| 395 |
< |
d = 2./(1. + r->rod/d); |
| 396 |
< |
scalecolor(sr.rcol, d); |
| 397 |
< |
addcolor(scol, sr.rcol); |
| 395 |
> |
d = 2./(1. + np->rp->rod/d); |
| 396 |
> |
scalescolor(sr.rcol, d); |
| 397 |
> |
saddscolor(scol, sr.rcol); |
| 398 |
|
} else { |
| 399 |
|
rayvalue(&sr); |
| 400 |
< |
multcolor(sr.rcol, sr.rcoef); |
| 401 |
< |
addcolor(r->rcol, sr.rcol); |
| 400 |
> |
smultscolor(sr.rcol, sr.rcoef); |
| 401 |
> |
saddscolor(np->rp->rcol, sr.rcol); |
| 402 |
|
} |
| 403 |
|
++nstaken; |
| 404 |
|
} |
| 405 |
|
if (nstarget > 1) { /* final W-G-M-D weighting */ |
| 406 |
< |
multcolor(scol, sr.rcoef); |
| 406 |
> |
smultscolor(scol, sr.rcoef); |
| 407 |
|
d = (double)nstarget/ntrials; |
| 408 |
< |
scalecolor(scol, d); |
| 409 |
< |
addcolor(r->rcol, scol); |
| 408 |
> |
scalescolor(scol, d); |
| 409 |
> |
saddscolor(np->rp->rcol, scol); |
| 410 |
|
} |
| 411 |
|
ndims--; |
| 412 |
|
} |
| 413 |
|
/* compute transmission */ |
| 414 |
< |
copycolor(sr.rcoef, np->mcolor); /* modify by material color */ |
| 415 |
< |
scalecolor(sr.rcoef, np->tspec); |
| 414 |
> |
copyscolor(sr.rcoef, np->mcolor); /* modify by material color */ |
| 415 |
> |
scalescolor(sr.rcoef, np->tspec); |
| 416 |
|
if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
| 417 |
< |
rayorigin(&sr, SPECULAR, r, sr.rcoef) == 0) { |
| 417 |
> |
rayorigin(&sr, TSPECULAR, np->rp, sr.rcoef) == 0) { |
| 418 |
|
nstarget = 1; |
| 419 |
|
if (specjitter > 1.5) { /* multiple samples? */ |
| 420 |
< |
nstarget = specjitter*r->rweight + .5; |
| 420 |
> |
nstarget = specjitter*np->rp->rweight + .5; |
| 421 |
|
if (sr.rweight <= minweight*nstarget) |
| 422 |
|
nstarget = sr.rweight/minweight; |
| 423 |
|
if (nstarget > 1) { |
| 424 |
|
d = 1./nstarget; |
| 425 |
< |
scalecolor(sr.rcoef, d); |
| 425 |
> |
scalescolor(sr.rcoef, d); |
| 426 |
|
sr.rweight *= d; |
| 427 |
|
} else |
| 428 |
|
nstarget = 1; |
| 429 |
|
} |
| 430 |
|
dimlist[ndims++] = (int)(size_t)np->mp; |
| 431 |
|
maxiter = MAXITER*nstarget; |
| 432 |
< |
for (nstaken = ntrials = 0; nstaken < nstarget && |
| 433 |
< |
ntrials < maxiter; ntrials++) { |
| 432 |
> |
for (nstaken = ntrials = 0; (nstaken < nstarget) & |
| 433 |
> |
(ntrials < maxiter); ntrials++) { |
| 434 |
|
if (ntrials) |
| 435 |
|
d = frandom(); |
| 436 |
|
else |
| 453 |
|
for (i = 0; i < 3; i++) |
| 454 |
|
sr.rdir[i] = np->prdir[i] + |
| 455 |
|
d*(cosp*np->u[i] + sinp*np->v[i]); |
| 456 |
< |
if (DOT(sr.rdir, r->ron) >= -FTINY) |
| 457 |
< |
continue; |
| 456 |
> |
if (DOT(sr.rdir,np->rp->ron) >= -FTINY) |
| 457 |
> |
continue; /* reject sample */ |
| 458 |
|
normalize(sr.rdir); /* OK, normalize */ |
| 459 |
|
if (nstaken) /* multi-sampling */ |
| 460 |
|
rayclear(&sr); |
| 461 |
|
rayvalue(&sr); |
| 462 |
< |
multcolor(sr.rcol, sr.rcoef); |
| 463 |
< |
addcolor(r->rcol, sr.rcol); |
| 462 |
> |
smultscolor(sr.rcol, sr.rcoef); |
| 463 |
> |
saddscolor(np->rp->rcol, sr.rcol); |
| 464 |
|
++nstaken; |
| 465 |
|
} |
| 466 |
|
ndims--; |
