17 |
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#include "pmapmat.h" |
18 |
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|
19 |
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/* |
20 |
< |
* Arguments to this material include optional diffuse colors. |
20 |
> |
* Arguments to this material include optional diffuse colors. |
21 |
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* String arguments include the BSDF and function files. |
22 |
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* For the MAT_BSDF type, a non-zero thickness causes the useful behavior |
23 |
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* of translating transmitted rays this distance beneath the surface |
87 |
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RREAL fromloc[3][3]; /* local BSDF coords to world */ |
88 |
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double thick; /* surface thickness */ |
89 |
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COLOR cthru; /* "through" component for MAT_ABSDF */ |
90 |
+ |
COLOR cthru_surr; /* surround for "through" component */ |
91 |
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SDData *sd; /* loaded BSDF data */ |
92 |
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COLOR rdiff; /* diffuse reflection */ |
93 |
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COLOR runsamp; /* BSDF hemispherical reflection */ |
97 |
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|
98 |
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#define cvt_sdcolor(cv, svp) ccy2rgb(&(svp)->spec, (svp)->cieY, cv) |
99 |
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|
100 |
+ |
typedef struct { |
101 |
+ |
double vy; /* brightness (for sorting) */ |
102 |
+ |
FVECT tdir; /* through sample direction (normalized) */ |
103 |
+ |
COLOR vcol; /* BTDF color */ |
104 |
+ |
} PEAKSAMP; /* BTDF peak sample */ |
105 |
+ |
|
106 |
+ |
/* Comparison function to put near-peak values in descending order */ |
107 |
+ |
static int |
108 |
+ |
cmp_psamp(const void *p1, const void *p2) |
109 |
+ |
{ |
110 |
+ |
double diff = (*(const PEAKSAMP *)p1).vy - (*(const PEAKSAMP *)p2).vy; |
111 |
+ |
if (diff > 0) return(-1); |
112 |
+ |
if (diff < 0) return(1); |
113 |
+ |
return(0); |
114 |
+ |
} |
115 |
+ |
|
116 |
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/* Compute "through" component color for MAT_ABSDF */ |
117 |
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static void |
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compute_through(BSDFDAT *ndp) |
119 |
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{ |
120 |
< |
#define NDIR2CHECK 13 |
120 |
> |
#define NDIR2CHECK 29 |
121 |
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static const float dir2check[NDIR2CHECK][2] = { |
122 |
< |
{0, 0}, |
123 |
< |
{-0.8, 0}, |
124 |
< |
{0, 0.8}, |
125 |
< |
{0, -0.8}, |
126 |
< |
{0.8, 0}, |
127 |
< |
{-0.8, 0.8}, |
128 |
< |
{-0.8, -0.8}, |
129 |
< |
{0.8, 0.8}, |
130 |
< |
{0.8, -0.8}, |
131 |
< |
{-1.6, 0}, |
115 |
< |
{0, 1.6}, |
116 |
< |
{0, -1.6}, |
117 |
< |
{1.6, 0}, |
122 |
> |
{0, 0}, {-0.6, 0}, {0, 0.6}, |
123 |
> |
{0, -0.6}, {0.6, 0}, {-0.6, 0.6}, |
124 |
> |
{-0.6, -0.6}, {0.6, 0.6}, {0.6, -0.6}, |
125 |
> |
{-1.2, 0}, {0, 1.2}, {0, -1.2}, |
126 |
> |
{1.2, 0}, {-1.2, 1.2}, {-1.2, -1.2}, |
127 |
> |
{1.2, 1.2}, {1.2, -1.2}, {-1.8, 0}, |
128 |
> |
{0, 1.8}, {0, -1.8}, {1.8, 0}, |
129 |
> |
{-1.8, 1.8}, {-1.8, -1.8}, {1.8, 1.8}, |
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> |
{1.8, -1.8}, {-2.4, 0}, {0, 2.4}, |
131 |
> |
{0, -2.4}, {2.4, 0}, |
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}; |
133 |
< |
const double peak_over = 1.5; |
133 |
> |
PEAKSAMP psamp[NDIR2CHECK]; |
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SDSpectralDF *dfp; |
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FVECT pdir; |
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double tomega, srchrad; |
137 |
< |
COLOR vpeak, vsum; |
138 |
< |
int i; |
137 |
> |
double tomsum, tomsurr; |
138 |
> |
COLOR vpeak, vsurr; |
139 |
> |
double vypeak; |
140 |
> |
int i, ns; |
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SDError ec; |
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|
143 |
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if (ndp->pr->rod > 0) |
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return; /* no specular transmission */ |
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if (bright(ndp->pr->pcol) <= FTINY) |
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return; /* pattern is black, here */ |
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srchrad = sqrt(dfp->minProjSA); /* else search for peak */ |
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setcolor(vpeak, 0, 0, 0); |
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setcolor(vsum, 0, 0, 0); |
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pdir[2] = 0.0; |
152 |
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srchrad = sqrt(dfp->minProjSA); /* else evaluate peak */ |
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for (i = 0; i < NDIR2CHECK; i++) { |
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FVECT tdir; |
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SDValue sv; |
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COLOR vcol; |
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tdir[0] = -ndp->vray[0] + dir2check[i][0]*srchrad; |
157 |
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tdir[1] = -ndp->vray[1] + dir2check[i][1]*srchrad; |
158 |
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tdir[2] = -ndp->vray[2]; |
159 |
< |
normalize(tdir); |
148 |
< |
ec = SDevalBSDF(&sv, tdir, ndp->vray, ndp->sd); |
155 |
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psamp[i].tdir[0] = -ndp->vray[0] + dir2check[i][0]*srchrad; |
156 |
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psamp[i].tdir[1] = -ndp->vray[1] + dir2check[i][1]*srchrad; |
157 |
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psamp[i].tdir[2] = -ndp->vray[2]; |
158 |
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normalize(psamp[i].tdir); |
159 |
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ec = SDevalBSDF(&sv, psamp[i].tdir, ndp->vray, ndp->sd); |
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if (ec) |
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goto baderror; |
162 |
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cvt_sdcolor(vcol, &sv); |
163 |
< |
addcolor(vsum, vcol); |
164 |
< |
if (sv.cieY > bright(vpeak)) { |
165 |
< |
copycolor(vpeak, vcol); |
166 |
< |
VCOPY(pdir, tdir); |
162 |
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cvt_sdcolor(psamp[i].vcol, &sv); |
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psamp[i].vy = sv.cieY; |
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} |
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qsort(psamp, NDIR2CHECK, sizeof(PEAKSAMP), cmp_psamp); |
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if (psamp[0].vy <= FTINY) |
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return; /* zero BTDF here */ |
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setcolor(vpeak, 0, 0, 0); |
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setcolor(vsurr, 0, 0, 0); |
170 |
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vypeak = tomsum = tomsurr = 0; /* combine top unique values */ |
171 |
> |
ns = 0; |
172 |
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for (i = 0; i < NDIR2CHECK; i++) { |
173 |
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if (i && psamp[i].vy == psamp[i-1].vy) |
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continue; /* assume duplicate sample */ |
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> |
|
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ec = SDsizeBSDF(&tomega, psamp[i].tdir, ndp->vray, |
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SDqueryMin, ndp->sd); |
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if (ec) |
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goto baderror; |
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> |
|
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scalecolor(psamp[i].vcol, tomega); |
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/* not part of peak? */ |
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if (tomega > 1.5*dfp->minProjSA || |
184 |
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vypeak > 8.*psamp[i].vy*ns) { |
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if (!i) return; /* abort */ |
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addcolor(vsurr, psamp[i].vcol); |
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tomsurr += tomega; |
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continue; |
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} |
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addcolor(vpeak, psamp[i].vcol); |
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tomsum += tomega; |
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vypeak += psamp[i].vy; |
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++ns; |
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} |
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if (pdir[2] == 0.0) |
196 |
< |
return; /* zero neighborhood */ |
197 |
< |
ec = SDsizeBSDF(&tomega, pdir, ndp->vray, SDqueryMin, ndp->sd); |
198 |
< |
if (ec) |
199 |
< |
goto baderror; |
200 |
< |
if (tomega > 1.5*dfp->minProjSA) |
164 |
< |
return; /* not really a peak? */ |
165 |
< |
tomega /= fabs(pdir[2]); /* remove cosine factor */ |
166 |
< |
if ((bright(vpeak) - ndp->sd->tLamb.cieY*(1./PI))*tomega <= .001) |
167 |
< |
return; /* < 0.1% transmission */ |
168 |
< |
for (i = 3; i--; ) /* remove peak from average */ |
169 |
< |
colval(vsum,i) -= colval(vpeak,i); |
170 |
< |
if (peak_over*bright(vsum) >= (NDIR2CHECK-1)*bright(vpeak)) |
171 |
< |
return; /* not peaky enough */ |
172 |
< |
copycolor(ndp->cthru, vpeak); /* else use it */ |
173 |
< |
scalecolor(ndp->cthru, tomega); |
195 |
> |
if (tomsurr <= FTINY) /* no surround implies no peak */ |
196 |
> |
return; |
197 |
> |
if ((vypeak/ns - (ndp->vray[2] > 0 ? ndp->sd->tLambFront.cieY |
198 |
> |
: ndp->sd->tLambBack.cieY)*(1./PI))*tomsum < .0005) |
199 |
> |
return; /* < 0.05% transmission */ |
200 |
> |
copycolor(ndp->cthru, vpeak); /* already scaled by omega */ |
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multcolor(ndp->cthru, ndp->pr->pcol); /* modify by pattern */ |
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+ |
scalecolor(vsurr, 1./tomsurr); /* surround is avg. BTDF */ |
203 |
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copycolor(ndp->cthru_surr, vsurr); |
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multcolor(ndp->cthru_surr, ndp->pr->pcol); |
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return; |
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baderror: |
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objerror(ndp->mp, USER, transSDError(ec)); |
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return(0); /* all diffuse */ |
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sv = ndp->sd->rLambBack; |
255 |
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break; |
256 |
< |
default: |
256 |
> |
case 1: |
257 |
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if ((ndp->sd->tf == NULL) & (ndp->sd->tb == NULL)) |
258 |
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return(0); /* all diffuse */ |
259 |
< |
sv = ndp->sd->tLamb; |
259 |
> |
sv = ndp->sd->tLambFront; |
260 |
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break; |
261 |
+ |
case 2: |
262 |
+ |
if ((ndp->sd->tf == NULL) & (ndp->sd->tb == NULL)) |
263 |
+ |
return(0); /* all diffuse */ |
264 |
+ |
sv = ndp->sd->tLambBack; |
265 |
+ |
break; |
266 |
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} |
267 |
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if (sv.cieY > FTINY) { |
268 |
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diffY = sv.cieY *= 1./PI; |
282 |
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((ndp->sd->tb != NULL) ? ndp->sd->tb : ndp->sd->tf) ; |
283 |
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|
284 |
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if (dx*dx + dy*dy <= (2.5*4./PI)*(omega + dfp->minProjSA + |
285 |
< |
2.*sqrt(omega*dfp->minProjSA))) |
286 |
< |
return(0); |
285 |
> |
2.*sqrt(omega*dfp->minProjSA))) { |
286 |
> |
if (bright(ndp->cthru_surr) <= FTINY) |
287 |
> |
return(0); |
288 |
> |
copycolor(cval, ndp->cthru_surr); |
289 |
> |
return(1); /* return non-zero surround BTDF */ |
290 |
> |
} |
291 |
|
} |
292 |
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ec = SDsizeBSDF(&tomega, ndp->vray, vsrc, SDqueryMin, ndp->sd); |
293 |
|
if (ec) |
325 |
|
if (tomega2 < .12*tomega) |
326 |
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continue; /* not safe to include */ |
327 |
|
cvt_sdcolor(csmp, &sv); |
328 |
< |
|
329 |
< |
if (sf < 2.5*tsr) { /* weight by Y for small sources */ |
328 |
> |
#if 0 |
329 |
> |
if (sf < 2.5*tsr) { /* weight by BSDF for small sources */ |
330 |
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scalecolor(csmp, sv.cieY); |
331 |
|
wtot += sv.cieY; |
332 |
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} else |
333 |
< |
wtot += 1.; |
333 |
> |
#endif |
334 |
> |
wtot += 1.; |
335 |
|
addcolor(cval, csmp); |
336 |
|
} |
337 |
|
if (wtot <= FTINY) /* no valid specular samples? */ |
596 |
|
rayvalue(&tr); |
597 |
|
multcolor(tr.rcol, tr.rcoef); |
598 |
|
addcolor(ndp->pr->rcol, tr.rcol); |
599 |
+ |
ndp->pr->rxt = ndp->pr->rot + raydistance(&tr); |
600 |
|
++ntotal; |
601 |
|
b = bright(ndp->cthru); |
602 |
|
} else |
676 |
|
/* get BSDF data */ |
677 |
|
nd.sd = loadBSDF(m->oargs.sarg[hasthick]); |
678 |
|
/* early shadow check #2 */ |
679 |
< |
if (r->crtype & SHADOW && (nd.sd->tf == NULL) & (nd.sd->tb == NULL)) |
679 |
> |
if (r->crtype & SHADOW && (nd.sd->tf == NULL) & (nd.sd->tb == NULL)) { |
680 |
> |
SDfreeCache(nd.sd); |
681 |
|
return(1); |
682 |
< |
/* diffuse reflectance */ |
682 |
> |
} |
683 |
> |
/* diffuse components */ |
684 |
|
if (hitfront) { |
685 |
|
cvt_sdcolor(nd.rdiff, &nd.sd->rLambFront); |
686 |
|
if (m->oargs.nfargs >= 3) { |
689 |
|
m->oargs.farg[2]); |
690 |
|
addcolor(nd.rdiff, ctmp); |
691 |
|
} |
692 |
+ |
cvt_sdcolor(nd.tdiff, &nd.sd->tLambFront); |
693 |
|
} else { |
694 |
|
cvt_sdcolor(nd.rdiff, &nd.sd->rLambBack); |
695 |
|
if (m->oargs.nfargs >= 6) { |
698 |
|
m->oargs.farg[5]); |
699 |
|
addcolor(nd.rdiff, ctmp); |
700 |
|
} |
701 |
+ |
cvt_sdcolor(nd.tdiff, &nd.sd->tLambBack); |
702 |
|
} |
703 |
< |
/* diffuse transmittance */ |
659 |
< |
cvt_sdcolor(nd.tdiff, &nd.sd->tLamb); |
660 |
< |
if (m->oargs.nfargs >= 9) { |
703 |
> |
if (m->oargs.nfargs >= 9) { /* add diffuse transmittance? */ |
704 |
|
setcolor(ctmp, m->oargs.farg[6], |
705 |
|
m->oargs.farg[7], |
706 |
|
m->oargs.farg[8]); |
735 |
|
} |
736 |
|
if (ec) { |
737 |
|
objerror(m, WARNING, "Illegal orientation vector"); |
738 |
+ |
SDfreeCache(nd.sd); |
739 |
|
return(1); |
740 |
|
} |
741 |
|
setcolor(nd.cthru, 0, 0, 0); /* consider through component */ |
742 |
+ |
setcolor(nd.cthru_surr, 0, 0, 0); |
743 |
|
if (m->otype == MAT_ABSDF) { |
744 |
|
compute_through(&nd); |
745 |
|
if (r->crtype & SHADOW) { |
746 |
|
RAY tr; /* attempt to pass shadow ray */ |
747 |
+ |
SDfreeCache(nd.sd); |
748 |
|
if (rayorigin(&tr, TRANS, r, nd.cthru) < 0) |
749 |
|
return(1); /* no through component */ |
750 |
|
VCOPY(tr.rdir, r->rdir); |