| 1 |
greg |
2.1 |
#ifndef lint |
| 2 |
|
|
static const char RCSid[] = "$Id$"; |
| 3 |
|
|
#endif |
| 4 |
|
|
/* |
| 5 |
|
|
* Shading for materials with BSDFs taken from XML data files |
| 6 |
|
|
*/ |
| 7 |
|
|
|
| 8 |
|
|
#include "copyright.h" |
| 9 |
|
|
|
| 10 |
|
|
#include "ray.h" |
| 11 |
|
|
#include "paths.h" |
| 12 |
|
|
#include "ambient.h" |
| 13 |
|
|
#include "source.h" |
| 14 |
|
|
#include "func.h" |
| 15 |
|
|
#include "bsdf.h" |
| 16 |
|
|
#include "random.h" |
| 17 |
|
|
|
| 18 |
|
|
/* |
| 19 |
|
|
* Arguments to this material include optional diffuse colors. |
| 20 |
|
|
* String arguments include the BSDF and function files. |
| 21 |
|
|
* A thickness variable causes the strange but useful behavior |
| 22 |
|
|
* of translating transmitted rays this distance past the surface |
| 23 |
|
|
* intersection in the normal direction to bypass intervening geometry. |
| 24 |
|
|
* This only affects scattered, non-source directed samples. Thus, |
| 25 |
|
|
* thickness is relevant only if there is a transmitted component. |
| 26 |
|
|
* A positive thickness has the further side-effect that an unscattered |
| 27 |
|
|
* (view) ray will pass right through our material if it has any |
| 28 |
|
|
* non-diffuse transmission, making our BSDF invisible. This allows the |
| 29 |
|
|
* underlying geometry to become visible. A matching surface should be |
| 30 |
|
|
* placed on the other side, less than the thickness away, if the backside |
| 31 |
|
|
* reflectance is non-zero. |
| 32 |
|
|
* The "up" vector for the BSDF is given by three variables, defined |
| 33 |
|
|
* (along with the thickness) by the named function file, or '.' if none. |
| 34 |
|
|
* Together with the surface normal, this defines the local coordinate |
| 35 |
|
|
* system for the BSDF. |
| 36 |
|
|
* We do not reorient the surface, so if the BSDF has no back-side |
| 37 |
|
|
* reflectance and none is given in the real arguments, the surface will |
| 38 |
|
|
* appear as black when viewed from behind (unless backvis is false). |
| 39 |
|
|
* The diffuse compnent arguments are added to components in the BSDF file, |
| 40 |
|
|
* not multiplied. However, patterns affect this material as a multiplier |
| 41 |
|
|
* on everything except non-diffuse reflection. |
| 42 |
|
|
* |
| 43 |
|
|
* Arguments for MAT_BSDF are: |
| 44 |
|
|
* 6+ thick BSDFfile ux uy uz funcfile transform |
| 45 |
|
|
* 0 |
| 46 |
|
|
* 0|3|9 rdf gdf bdf |
| 47 |
|
|
* rdb gdb bdb |
| 48 |
|
|
* rdt gdt bdt |
| 49 |
|
|
*/ |
| 50 |
|
|
|
| 51 |
|
|
typedef struct { |
| 52 |
|
|
OBJREC *mp; /* material pointer */ |
| 53 |
|
|
RAY *pr; /* intersected ray */ |
| 54 |
|
|
FVECT pnorm; /* perturbed surface normal */ |
| 55 |
|
|
FVECT vinc; /* local incident vector */ |
| 56 |
|
|
RREAL toloc[3][3]; /* world to local BSDF coords */ |
| 57 |
|
|
RREAL fromloc[3][3]; /* local BSDF coords to world */ |
| 58 |
|
|
double thick; /* surface thickness */ |
| 59 |
|
|
SDData *sd; /* loaded BSDF data */ |
| 60 |
|
|
COLOR runsamp; /* BSDF hemispherical reflection */ |
| 61 |
|
|
COLOR rdiff; /* added diffuse reflection */ |
| 62 |
|
|
COLOR tunsamp; /* BSDF hemispherical transmission */ |
| 63 |
|
|
COLOR tdiff; /* added diffuse transmission */ |
| 64 |
|
|
} BSDFDAT; /* BSDF material data */ |
| 65 |
|
|
|
| 66 |
|
|
#define cvt_sdcolor(cv, svp) ccy2rgb(&(svp)->spec, (svp)->cieY, cv) |
| 67 |
|
|
|
| 68 |
|
|
/* Convert error from BSDF library */ |
| 69 |
|
|
static char * |
| 70 |
|
|
cvt_sderr(SDError ec) |
| 71 |
|
|
{ |
| 72 |
|
|
if (!SDerrorDetail[0]) |
| 73 |
|
|
return(strcpy(errmsg, SDerrorEnglish[ec])); |
| 74 |
|
|
sprintf(errmsg, "%s: %s", SDerrorEnglish[ec], SDerrorDetail); |
| 75 |
|
|
return(errmsg); |
| 76 |
|
|
} |
| 77 |
|
|
|
| 78 |
|
|
/* Compute source contribution for BSDF */ |
| 79 |
|
|
static void |
| 80 |
|
|
dirbsdf( |
| 81 |
|
|
COLOR cval, /* returned coefficient */ |
| 82 |
|
|
void *nnp, /* material data */ |
| 83 |
|
|
FVECT ldir, /* light source direction */ |
| 84 |
|
|
double omega /* light source size */ |
| 85 |
|
|
) |
| 86 |
|
|
{ |
| 87 |
|
|
BSDFDAT *np = nnp; |
| 88 |
|
|
SDError ec; |
| 89 |
|
|
SDValue sv; |
| 90 |
|
|
FVECT vout; |
| 91 |
|
|
double ldot; |
| 92 |
|
|
double dtmp; |
| 93 |
|
|
COLOR ctmp; |
| 94 |
|
|
|
| 95 |
|
|
setcolor(cval, .0, .0, .0); |
| 96 |
|
|
|
| 97 |
|
|
ldot = DOT(np->pnorm, ldir); |
| 98 |
|
|
if ((-FTINY <= ldot) & (ldot <= FTINY)) |
| 99 |
|
|
return; |
| 100 |
|
|
|
| 101 |
|
|
if (ldot > .0 && bright(np->rdiff) > FTINY) { |
| 102 |
|
|
/* |
| 103 |
|
|
* Compute added diffuse reflected component. |
| 104 |
|
|
*/ |
| 105 |
|
|
copycolor(ctmp, np->rdiff); |
| 106 |
|
|
dtmp = ldot * omega * (1./PI); |
| 107 |
|
|
scalecolor(ctmp, dtmp); |
| 108 |
|
|
addcolor(cval, ctmp); |
| 109 |
|
|
} |
| 110 |
|
|
if (ldot < .0 && bright(np->tdiff) > FTINY) { |
| 111 |
|
|
/* |
| 112 |
|
|
* Compute added diffuse transmission. |
| 113 |
|
|
*/ |
| 114 |
|
|
copycolor(ctmp, np->tdiff); |
| 115 |
|
|
dtmp = -ldot * omega * (1.0/PI); |
| 116 |
|
|
scalecolor(ctmp, dtmp); |
| 117 |
|
|
addcolor(cval, ctmp); |
| 118 |
|
|
} |
| 119 |
|
|
/* |
| 120 |
|
|
* Compute scattering coefficient using BSDF. |
| 121 |
|
|
*/ |
| 122 |
|
|
if (SDmapDir(vout, np->toloc, ldir) != SDEnone) |
| 123 |
|
|
return; |
| 124 |
|
|
ec = SDevalBSDF(&sv, vout, np->vinc, np->sd); |
| 125 |
|
|
if (ec) |
| 126 |
|
|
objerror(np->mp, USER, cvt_sderr(ec)); |
| 127 |
|
|
|
| 128 |
|
|
if (sv.cieY <= FTINY) /* not worth using? */ |
| 129 |
|
|
return; |
| 130 |
|
|
cvt_sdcolor(ctmp, &sv); |
| 131 |
|
|
if (ldot > .0) { /* pattern only diffuse reflection */ |
| 132 |
|
|
COLOR ctmp1, ctmp2; |
| 133 |
|
|
dtmp = (np->pr->rod > .0) ? np->sd->rLambFront.cieY |
| 134 |
|
|
: np->sd->rLambBack.cieY; |
| 135 |
|
|
dtmp /= PI * sv.cieY; /* diffuse fraction */ |
| 136 |
|
|
copycolor(ctmp2, np->pr->pcol); |
| 137 |
|
|
scalecolor(ctmp2, dtmp); |
| 138 |
|
|
setcolor(ctmp1, 1.-dtmp, 1.-dtmp, 1.-dtmp); |
| 139 |
|
|
addcolor(ctmp1, ctmp2); |
| 140 |
|
|
multcolor(ctmp, ctmp1); /* apply desaturated pattern */ |
| 141 |
|
|
dtmp = ldot * omega; |
| 142 |
|
|
} else { /* full pattern on transmission */ |
| 143 |
|
|
multcolor(ctmp, np->pr->pcol); |
| 144 |
|
|
dtmp = -ldot * omega; |
| 145 |
|
|
} |
| 146 |
|
|
scalecolor(ctmp, dtmp); |
| 147 |
|
|
addcolor(cval, ctmp); |
| 148 |
|
|
} |
| 149 |
|
|
|
| 150 |
|
|
/* Sample separate BSDF component */ |
| 151 |
|
|
static int |
| 152 |
|
|
sample_sdcomp(BSDFDAT *ndp, SDComponent *dcp, int usepat) |
| 153 |
|
|
{ |
| 154 |
|
|
int nstarget = 1; |
| 155 |
|
|
int nsent = 0; |
| 156 |
|
|
SDError ec; |
| 157 |
|
|
SDValue bsv; |
| 158 |
|
|
double sthick; |
| 159 |
|
|
FVECT vout; |
| 160 |
|
|
RAY sr; |
| 161 |
|
|
int ntrials; |
| 162 |
|
|
/* multiple samples? */ |
| 163 |
|
|
if (specjitter > 1.5) { |
| 164 |
|
|
nstarget = specjitter*ndp->pr->rweight + .5; |
| 165 |
|
|
if (nstarget < 1) |
| 166 |
|
|
nstarget = 1; |
| 167 |
|
|
} |
| 168 |
|
|
/* run through our trials */ |
| 169 |
|
|
for (ntrials = 0; nsent < nstarget && ntrials < 9*nstarget; ntrials++) { |
| 170 |
|
|
SDerrorDetail[0] = '\0'; |
| 171 |
|
|
/* sample direction & coef. */ |
| 172 |
|
|
ec = SDsampComponent(&bsv, vout, ndp->vinc, |
| 173 |
|
|
ntrials ? frandom() |
| 174 |
|
|
: urand(ilhash(dimlist,ndims)+samplendx), |
| 175 |
|
|
dcp); |
| 176 |
|
|
if (ec) |
| 177 |
|
|
objerror(ndp->mp, USER, cvt_sderr(ec)); |
| 178 |
|
|
/* zero component? */ |
| 179 |
|
|
if (bsv.cieY <= FTINY) |
| 180 |
|
|
break; |
| 181 |
|
|
/* map vector to world */ |
| 182 |
|
|
if (SDmapDir(sr.rdir, ndp->fromloc, vout) != SDEnone) |
| 183 |
|
|
break; |
| 184 |
|
|
/* unintentional penetration? */ |
| 185 |
|
|
if (DOT(sr.rdir, ndp->pr->ron) > .0 ^ vout[2] > .0) |
| 186 |
|
|
continue; |
| 187 |
|
|
/* spawn a specular ray */ |
| 188 |
|
|
if (nstarget > 1) |
| 189 |
|
|
bsv.cieY /= (double)nstarget; |
| 190 |
|
|
cvt_sdcolor(sr.rcoef, &bsv); /* use color */ |
| 191 |
|
|
if (usepat) /* pattern on transmission */ |
| 192 |
|
|
multcolor(sr.rcoef, ndp->pr->pcol); |
| 193 |
|
|
if (rayorigin(&sr, SPECULAR, ndp->pr, sr.rcoef) < 0) { |
| 194 |
|
|
if (maxdepth > 0) |
| 195 |
|
|
break; |
| 196 |
|
|
++nsent; /* Russian roulette victim */ |
| 197 |
|
|
continue; |
| 198 |
|
|
} |
| 199 |
|
|
/* need to move origin? */ |
| 200 |
|
|
sthick = (ndp->pr->rod > .0) ? -ndp->thick : ndp->thick; |
| 201 |
|
|
if (sthick < .0 ^ vout[2] > .0) |
| 202 |
|
|
VSUM(sr.rorg, sr.rorg, ndp->pr->ron, sthick); |
| 203 |
|
|
|
| 204 |
|
|
rayvalue(&sr); /* send & evaluate sample */ |
| 205 |
|
|
multcolor(sr.rcol, sr.rcoef); |
| 206 |
|
|
addcolor(ndp->pr->rcol, sr.rcol); |
| 207 |
|
|
++nsent; |
| 208 |
|
|
} |
| 209 |
|
|
return(nsent); |
| 210 |
|
|
} |
| 211 |
|
|
|
| 212 |
|
|
/* Sample non-diffuse components of BSDF */ |
| 213 |
|
|
static int |
| 214 |
|
|
sample_sdf(BSDFDAT *ndp, int sflags) |
| 215 |
|
|
{ |
| 216 |
|
|
int n, ntotal = 0; |
| 217 |
|
|
SDSpectralDF *dfp; |
| 218 |
|
|
COLORV *unsc; |
| 219 |
|
|
|
| 220 |
|
|
if (sflags == SDsampSpT) { |
| 221 |
|
|
unsc = ndp->tunsamp; |
| 222 |
|
|
dfp = ndp->sd->tf; |
| 223 |
|
|
cvt_sdcolor(unsc, &ndp->sd->tLamb); |
| 224 |
|
|
} else /* sflags == SDsampSpR */ { |
| 225 |
|
|
unsc = ndp->runsamp; |
| 226 |
|
|
if (ndp->pr->rod > .0) { |
| 227 |
|
|
dfp = ndp->sd->rf; |
| 228 |
|
|
cvt_sdcolor(unsc, &ndp->sd->rLambFront); |
| 229 |
|
|
} else { |
| 230 |
|
|
dfp = ndp->sd->rb; |
| 231 |
|
|
cvt_sdcolor(unsc, &ndp->sd->rLambBack); |
| 232 |
|
|
} |
| 233 |
|
|
} |
| 234 |
|
|
multcolor(unsc, ndp->pr->pcol); |
| 235 |
|
|
if (dfp == NULL) /* no specular component? */ |
| 236 |
|
|
return(0); |
| 237 |
|
|
/* below sampling threshold? */ |
| 238 |
|
|
if (dfp->maxHemi <= specthresh+FTINY) { |
| 239 |
|
|
if (dfp->maxHemi > FTINY) { /* XXX no color from BSDF! */ |
| 240 |
|
|
double d = SDdirectHemi(ndp->vinc, sflags, ndp->sd); |
| 241 |
|
|
COLOR ctmp; |
| 242 |
|
|
if (sflags == SDsampSpT) { |
| 243 |
|
|
copycolor(ctmp, ndp->pr->pcol); |
| 244 |
|
|
scalecolor(ctmp, d); |
| 245 |
|
|
} else /* no pattern on reflection */ |
| 246 |
|
|
setcolor(ctmp, d, d, d); |
| 247 |
|
|
addcolor(unsc, ctmp); |
| 248 |
|
|
} |
| 249 |
|
|
return(0); |
| 250 |
|
|
} |
| 251 |
|
|
/* else need to sample */ |
| 252 |
|
|
dimlist[ndims++] = (int)(size_t)ndp->mp; |
| 253 |
|
|
ndims++; |
| 254 |
|
|
for (n = dfp->ncomp; n--; ) { /* loop over components */ |
| 255 |
|
|
dimlist[ndims-1] = n + 9438; |
| 256 |
|
|
ntotal += sample_sdcomp(ndp, &dfp->comp[n], sflags==SDsampSpT); |
| 257 |
|
|
} |
| 258 |
|
|
ndims -= 2; |
| 259 |
|
|
return(ntotal); |
| 260 |
|
|
} |
| 261 |
|
|
|
| 262 |
|
|
/* Color a ray that hit a BSDF material */ |
| 263 |
|
|
int |
| 264 |
|
|
m_bsdf(OBJREC *m, RAY *r) |
| 265 |
|
|
{ |
| 266 |
|
|
COLOR ctmp; |
| 267 |
|
|
SDError ec; |
| 268 |
|
|
FVECT upvec, outVec; |
| 269 |
|
|
MFUNC *mf; |
| 270 |
|
|
BSDFDAT nd; |
| 271 |
|
|
/* check arguments */ |
| 272 |
|
|
if ((m->oargs.nsargs < 6) | (m->oargs.nfargs > 9) | |
| 273 |
|
|
(m->oargs.nfargs % 3)) |
| 274 |
|
|
objerror(m, USER, "bad # arguments"); |
| 275 |
|
|
|
| 276 |
|
|
SDerrorDetail[0] = '\0'; /* get BSDF data */ |
| 277 |
|
|
nd.sd = SDgetCache(m->oargs.sarg[1]); |
| 278 |
|
|
if (nd.sd == NULL) |
| 279 |
|
|
error(SYSTEM, "out of memory in m_bsdf"); |
| 280 |
|
|
if (!SDisLoaded(nd.sd)) { |
| 281 |
|
|
char *pname = getpath(m->oargs.sarg[1], getrlibpath(), R_OK); |
| 282 |
|
|
if (pname == NULL) { |
| 283 |
|
|
sprintf(errmsg, "cannot find BSDF file \"%s\"", |
| 284 |
|
|
m->oargs.sarg[1]); |
| 285 |
|
|
objerror(m, USER, errmsg); |
| 286 |
|
|
} |
| 287 |
|
|
ec = SDloadFile(nd.sd, pname); |
| 288 |
|
|
if (ec) |
| 289 |
|
|
objerror(m, USER, cvt_sderr(ec)); |
| 290 |
|
|
SDretainSet = SDretainAll; |
| 291 |
|
|
} |
| 292 |
|
|
/* load cal file */ |
| 293 |
|
|
mf = getfunc(m, 5, 0x1d, 1); |
| 294 |
|
|
/* get thickness */ |
| 295 |
|
|
nd.thick = evalue(mf->ep[0]); |
| 296 |
|
|
if (nd.thick < .0) |
| 297 |
|
|
nd.thick = .0; |
| 298 |
|
|
/* check shadow */ |
| 299 |
|
|
if (r->crtype & SHADOW) { |
| 300 |
|
|
SDfreeCache(nd.sd); |
| 301 |
|
|
if (nd.thick > FTINY && nd.sd->tf != NULL && |
| 302 |
|
|
nd.sd->tf->maxHemi > FTINY) |
| 303 |
|
|
raytrans(r); /* pass-through */ |
| 304 |
|
|
return(1); /* else shadow */ |
| 305 |
|
|
} |
| 306 |
|
|
/* check unscattered ray */ |
| 307 |
|
|
if (!(r->crtype & (SPECULAR|AMBIENT)) && nd.thick > FTINY && |
| 308 |
|
|
nd.sd->tf != NULL && nd.sd->tf->maxHemi > FTINY) { |
| 309 |
|
|
SDfreeCache(nd.sd); |
| 310 |
|
|
raytrans(r); /* pass-through */ |
| 311 |
|
|
return(1); |
| 312 |
|
|
} |
| 313 |
|
|
/* diffuse reflectance */ |
| 314 |
|
|
if (r->rod > .0) { |
| 315 |
|
|
if (m->oargs.nfargs < 3) |
| 316 |
|
|
setcolor(nd.rdiff, .0, .0, .0); |
| 317 |
|
|
else |
| 318 |
|
|
setcolor(nd.rdiff, m->oargs.farg[0], |
| 319 |
|
|
m->oargs.farg[1], |
| 320 |
|
|
m->oargs.farg[2]); |
| 321 |
|
|
} else { |
| 322 |
|
|
if (m->oargs.nfargs < 6) { /* check invisible backside */ |
| 323 |
|
|
if (!backvis && (nd.sd->rb == NULL || |
| 324 |
|
|
nd.sd->rb->maxHemi <= FTINY) && |
| 325 |
|
|
(nd.sd->tf == NULL || |
| 326 |
|
|
nd.sd->tf->maxHemi <= FTINY)) { |
| 327 |
|
|
SDfreeCache(nd.sd); |
| 328 |
|
|
raytrans(r); |
| 329 |
|
|
return(1); |
| 330 |
|
|
} |
| 331 |
|
|
setcolor(nd.rdiff, .0, .0, .0); |
| 332 |
|
|
} else |
| 333 |
|
|
setcolor(nd.rdiff, m->oargs.farg[3], |
| 334 |
|
|
m->oargs.farg[4], |
| 335 |
|
|
m->oargs.farg[5]); |
| 336 |
|
|
} |
| 337 |
|
|
/* diffuse transmittance */ |
| 338 |
|
|
if (m->oargs.nfargs < 9) |
| 339 |
|
|
setcolor(nd.tdiff, .0, .0, .0); |
| 340 |
|
|
else |
| 341 |
|
|
setcolor(nd.tdiff, m->oargs.farg[6], |
| 342 |
|
|
m->oargs.farg[7], |
| 343 |
|
|
m->oargs.farg[8]); |
| 344 |
|
|
nd.mp = m; |
| 345 |
|
|
nd.pr = r; |
| 346 |
|
|
/* get modifiers */ |
| 347 |
|
|
raytexture(r, m->omod); |
| 348 |
|
|
if (bright(r->pcol) <= FTINY) { /* black pattern?! */ |
| 349 |
|
|
SDfreeCache(nd.sd); |
| 350 |
|
|
return(1); |
| 351 |
|
|
} |
| 352 |
|
|
/* modify diffuse values */ |
| 353 |
|
|
multcolor(nd.rdiff, r->pcol); |
| 354 |
|
|
multcolor(nd.tdiff, r->pcol); |
| 355 |
|
|
/* get up vector */ |
| 356 |
|
|
upvec[0] = evalue(mf->ep[1]); |
| 357 |
|
|
upvec[1] = evalue(mf->ep[2]); |
| 358 |
|
|
upvec[2] = evalue(mf->ep[3]); |
| 359 |
|
|
/* return to world coords */ |
| 360 |
|
|
if (mf->f != &unitxf) { |
| 361 |
|
|
multv3(upvec, upvec, mf->f->xfm); |
| 362 |
|
|
nd.thick *= mf->f->sca; |
| 363 |
|
|
} |
| 364 |
|
|
raynormal(nd.pnorm, r); |
| 365 |
|
|
/* compute local BSDF xform */ |
| 366 |
|
|
ec = SDcompXform(nd.toloc, nd.pnorm, upvec); |
| 367 |
|
|
if (!ec) { |
| 368 |
|
|
nd.vinc[0] = -r->rdir[0]; |
| 369 |
|
|
nd.vinc[1] = -r->rdir[1]; |
| 370 |
|
|
nd.vinc[2] = -r->rdir[2]; |
| 371 |
|
|
ec = SDmapDir(nd.vinc, nd.toloc, nd.vinc); |
| 372 |
|
|
} |
| 373 |
|
|
if (!ec) |
| 374 |
|
|
ec = SDinvXform(nd.fromloc, nd.toloc); |
| 375 |
|
|
if (ec) { |
| 376 |
|
|
objerror(m, WARNING, cvt_sderr(ec)); |
| 377 |
|
|
SDfreeCache(nd.sd); |
| 378 |
|
|
return(1); |
| 379 |
|
|
} |
| 380 |
|
|
if (r->rod < .0) { /* perturb normal towards hit */ |
| 381 |
|
|
nd.pnorm[0] = -nd.pnorm[0]; |
| 382 |
|
|
nd.pnorm[1] = -nd.pnorm[1]; |
| 383 |
|
|
nd.pnorm[2] = -nd.pnorm[2]; |
| 384 |
|
|
} |
| 385 |
|
|
/* sample reflection */ |
| 386 |
|
|
sample_sdf(&nd, SDsampSpR); |
| 387 |
|
|
/* sample transmission */ |
| 388 |
|
|
sample_sdf(&nd, SDsampSpT); |
| 389 |
|
|
/* compute indirect diffuse */ |
| 390 |
|
|
copycolor(ctmp, nd.rdiff); |
| 391 |
|
|
addcolor(ctmp, nd.runsamp); |
| 392 |
|
|
if (bright(ctmp) > FTINY) { /* ambient from this side */ |
| 393 |
|
|
if (r->rod < .0) |
| 394 |
|
|
flipsurface(r); |
| 395 |
|
|
multambient(ctmp, r, nd.pnorm); |
| 396 |
|
|
addcolor(r->rcol, ctmp); |
| 397 |
|
|
if (r->rod < .0) |
| 398 |
|
|
flipsurface(r); |
| 399 |
|
|
} |
| 400 |
|
|
copycolor(ctmp, nd.tdiff); |
| 401 |
|
|
addcolor(ctmp, nd.tunsamp); |
| 402 |
|
|
if (bright(ctmp) > FTINY) { /* ambient from other side */ |
| 403 |
|
|
FVECT bnorm; |
| 404 |
|
|
if (r->rod > .0) |
| 405 |
|
|
flipsurface(r); |
| 406 |
|
|
bnorm[0] = -nd.pnorm[0]; |
| 407 |
|
|
bnorm[1] = -nd.pnorm[1]; |
| 408 |
|
|
bnorm[2] = -nd.pnorm[2]; |
| 409 |
|
|
multambient(ctmp, r, bnorm); |
| 410 |
|
|
addcolor(r->rcol, ctmp); |
| 411 |
|
|
if (r->rod > .0) |
| 412 |
|
|
flipsurface(r); |
| 413 |
|
|
} |
| 414 |
|
|
/* add direct component */ |
| 415 |
|
|
direct(r, dirbsdf, &nd); |
| 416 |
|
|
/* clean up */ |
| 417 |
|
|
SDfreeCache(nd.sd); |
| 418 |
|
|
return(1); |
| 419 |
|
|
} |
