| 8 |
|
#include "copyright.h" |
| 9 |
|
|
| 10 |
|
#include "ray.h" |
| 11 |
+ |
#include "otypes.h" |
| 12 |
|
#include "ambient.h" |
| 13 |
|
#include "source.h" |
| 14 |
|
#include "func.h" |
| 17 |
|
#include "pmapmat.h" |
| 18 |
|
|
| 19 |
|
/* |
| 20 |
< |
* Arguments to this material include optional diffuse colors. |
| 20 |
> |
* Arguments to this material include optional diffuse colors. |
| 21 |
|
* String arguments include the BSDF and function files. |
| 22 |
< |
* A non-zero thickness causes the strange but useful behavior |
| 22 |
> |
* For the MAT_BSDF type, a non-zero thickness causes the useful behavior |
| 23 |
|
* of translating transmitted rays this distance beneath the surface |
| 24 |
|
* (opposite the surface normal) to bypass any intervening geometry. |
| 25 |
|
* Translation only affects scattered, non-source-directed samples. |
| 36 |
|
* hides geometry in front of the surface when rays hit from behind, |
| 37 |
|
* and applies only the transmission and backside reflectance properties. |
| 38 |
|
* Reflection is ignored on the hidden side, as those rays pass through. |
| 39 |
< |
* When thickness is set to zero, shadow rays will be blocked unless |
| 40 |
< |
* a BTDF has a strong "through" component in the source direction. |
| 39 |
> |
* For the MAT_SBSDF type, we check for a strong "through" component. |
| 40 |
> |
* Such a component will cause direct rays to pass through unscattered. |
| 41 |
|
* A separate test prevents over-counting by dropping samples that are |
| 42 |
|
* too close to this "through" direction. BSDFs with such a through direction |
| 43 |
|
* will also have a view component, meaning they are somewhat see-through. |
| 44 |
+ |
* A MAT_BSDF type with zero thickness behaves the same as a MAT_SBSDF |
| 45 |
+ |
* type with no strong through component. |
| 46 |
|
* The "up" vector for the BSDF is given by three variables, defined |
| 47 |
|
* (along with the thickness) by the named function file, or '.' if none. |
| 48 |
|
* Together with the surface normal, this defines the local coordinate |
| 55 |
|
* not multiplied. However, patterns affect this material as a multiplier |
| 56 |
|
* on everything except non-diffuse reflection. |
| 57 |
|
* |
| 58 |
+ |
* Arguments for MAT_SBSDF are: |
| 59 |
+ |
* 5+ BSDFfile ux uy uz funcfile transform |
| 60 |
+ |
* 0 |
| 61 |
+ |
* 0|3|6|9 rdf gdf bdf |
| 62 |
+ |
* rdb gdb bdb |
| 63 |
+ |
* rdt gdt bdt |
| 64 |
+ |
* |
| 65 |
|
* Arguments for MAT_BSDF are: |
| 66 |
|
* 6+ thick BSDFfile ux uy uz funcfile transform |
| 67 |
|
* 0 |
| 86 |
|
RREAL toloc[3][3]; /* world to local BSDF coords */ |
| 87 |
|
RREAL fromloc[3][3]; /* local BSDF coords to world */ |
| 88 |
|
double thick; /* surface thickness */ |
| 89 |
< |
COLOR cthru; /* "through" component multiplier */ |
| 89 |
> |
COLOR cthru; /* "through" component for MAT_SBSDF */ |
| 90 |
|
SDData *sd; /* loaded BSDF data */ |
| 91 |
|
COLOR rdiff; /* diffuse reflection */ |
| 92 |
|
COLOR runsamp; /* BSDF hemispherical reflection */ |
| 96 |
|
|
| 97 |
|
#define cvt_sdcolor(cv, svp) ccy2rgb(&(svp)->spec, (svp)->cieY, cv) |
| 98 |
|
|
| 99 |
< |
/* Compute "through" component color */ |
| 99 |
> |
/* Compute "through" component color for MAT_SBSDF */ |
| 100 |
|
static void |
| 101 |
|
compute_through(BSDFDAT *ndp) |
| 102 |
|
{ |
| 116 |
|
{0, -1.6}, |
| 117 |
|
{1.6, 0}, |
| 118 |
|
}; |
| 119 |
< |
const double peak_over = 2.0; |
| 119 |
> |
const double peak_over = 1.5; |
| 120 |
|
SDSpectralDF *dfp; |
| 121 |
|
FVECT pdir; |
| 122 |
|
double tomega, srchrad; |
| 124 |
|
int i; |
| 125 |
|
SDError ec; |
| 126 |
|
|
| 117 |
– |
setcolor(ndp->cthru, 0, 0, 0); /* starting assumption */ |
| 118 |
– |
|
| 127 |
|
if (ndp->pr->rod > 0) |
| 128 |
|
dfp = (ndp->sd->tf != NULL) ? ndp->sd->tf : ndp->sd->tb; |
| 129 |
|
else |
| 136 |
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srchrad = sqrt(dfp->minProjSA); /* else search for peak */ |
| 137 |
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setcolor(vpeak, 0, 0, 0); |
| 138 |
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setcolor(vsum, 0, 0, 0); |
| 139 |
+ |
pdir[2] = 0.0; |
| 140 |
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for (i = 0; i < NDIR2CHECK; i++) { |
| 141 |
|
FVECT tdir; |
| 142 |
|
SDValue sv; |
| 150 |
|
goto baderror; |
| 151 |
|
cvt_sdcolor(vcol, &sv); |
| 152 |
|
addcolor(vsum, vcol); |
| 153 |
< |
if (bright(vcol) > bright(vpeak)) { |
| 153 |
> |
if (sv.cieY > bright(vpeak)) { |
| 154 |
|
copycolor(vpeak, vcol); |
| 155 |
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VCOPY(pdir, tdir); |
| 156 |
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} |
| 157 |
|
} |
| 158 |
+ |
if (pdir[2] == 0.0) |
| 159 |
+ |
return; /* zero neighborhood */ |
| 160 |
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ec = SDsizeBSDF(&tomega, pdir, ndp->vray, SDqueryMin, ndp->sd); |
| 161 |
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if (ec) |
| 162 |
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goto baderror; |
| 163 |
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if (tomega > 1.5*dfp->minProjSA) |
| 164 |
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return; /* not really a peak? */ |
| 165 |
+ |
tomega /= fabs(pdir[2]); /* remove cosine factor */ |
| 166 |
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if ((bright(vpeak) - ndp->sd->tLamb.cieY*(1./PI))*tomega <= .001) |
| 167 |
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return; /* < 0.1% transmission */ |
| 168 |
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for (i = 3; i--; ) /* remove peak from average */ |
| 196 |
|
static int |
| 197 |
|
direct_specular_OK(COLOR cval, FVECT ldir, double omega, BSDFDAT *ndp) |
| 198 |
|
{ |
| 199 |
< |
int nsamp, ok = 0; |
| 199 |
> |
int nsamp; |
| 200 |
> |
double wtot = 0; |
| 201 |
|
FVECT vsrc, vsmp, vjit; |
| 202 |
|
double tomega, tomega2; |
| 203 |
|
double sf, tsr, sd[2]; |
| 245 |
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if ((vsrc[2] > 0) ^ (ndp->vray[2] > 0) && bright(ndp->cthru) > FTINY) { |
| 246 |
|
double dx = vsrc[0] + ndp->vray[0]; |
| 247 |
|
double dy = vsrc[1] + ndp->vray[1]; |
| 248 |
< |
if (dx*dx + dy*dy <= (4./PI)*(omega + tomega + |
| 248 |
> |
if (dx*dx + dy*dy <= (2.5*4./PI)*(omega + tomega + |
| 249 |
|
2.*sqrt(omega*tomega))) |
| 250 |
|
return(0); |
| 251 |
|
} |
| 282 |
|
if (tomega2 < .12*tomega) |
| 283 |
|
continue; /* not safe to include */ |
| 284 |
|
cvt_sdcolor(csmp, &sv); |
| 285 |
< |
addcolor(cval, csmp); /* else average it in */ |
| 286 |
< |
++ok; |
| 285 |
> |
|
| 286 |
> |
if (sf < 2.5*tsr) { /* weight by Y for small sources */ |
| 287 |
> |
scalecolor(csmp, sv.cieY); |
| 288 |
> |
wtot += sv.cieY; |
| 289 |
> |
} else |
| 290 |
> |
wtot += 1.; |
| 291 |
> |
addcolor(cval, csmp); |
| 292 |
|
} |
| 293 |
< |
if (!ok) /* no valid specular samples? */ |
| 293 |
> |
if (wtot <= FTINY) /* no valid specular samples? */ |
| 294 |
|
return(0); |
| 295 |
|
|
| 296 |
< |
sf = 1./(double)ok; /* compute average BSDF */ |
| 296 |
> |
sf = 1./wtot; /* weighted average BSDF */ |
| 297 |
|
scalecolor(cval, sf); |
| 298 |
|
/* subtract diffuse contribution */ |
| 299 |
|
for (i = 3*(diffY > FTINY); i--; ) |
| 450 |
|
sample_sdcomp(BSDFDAT *ndp, SDComponent *dcp, int xmit) |
| 451 |
|
{ |
| 452 |
|
const int hasthru = (xmit && |
| 453 |
< |
!(ndp->pr->crtype & (SPECULAR|AMBIENT)) && |
| 454 |
< |
bright(ndp->cthru) > FTINY); |
| 453 |
> |
!(ndp->pr->crtype & (SPECULAR|AMBIENT)) |
| 454 |
> |
&& bright(ndp->cthru) > FTINY); |
| 455 |
|
int nstarget = 1; |
| 456 |
|
int nsent = 0; |
| 457 |
|
int n; |
| 498 |
|
if (xmit) /* apply pattern on transmit */ |
| 499 |
|
multcolor(sr.rcoef, ndp->pr->pcol); |
| 500 |
|
if (rayorigin(&sr, SPECULAR, ndp->pr, sr.rcoef) < 0) { |
| 501 |
< |
if (maxdepth > 0) |
| 502 |
< |
break; |
| 503 |
< |
continue; /* Russian roulette victim */ |
| 501 |
> |
if (!n & (nstarget > 1)) { |
| 502 |
> |
n = nstarget; /* avoid infinitue loop */ |
| 503 |
> |
nstarget = nstarget*sr.rweight/minweight; |
| 504 |
> |
if (n == nstarget) break; |
| 505 |
> |
n = -1; /* moved target */ |
| 506 |
> |
} |
| 507 |
> |
continue; /* try again */ |
| 508 |
|
} |
| 509 |
|
if (xmit && ndp->thick != 0) /* need to offset origin? */ |
| 510 |
|
VSUM(sr.rorg, sr.rorg, ndp->pr->ron, -ndp->thick); |
| 520 |
|
static int |
| 521 |
|
sample_sdf(BSDFDAT *ndp, int sflags) |
| 522 |
|
{ |
| 523 |
< |
int hasthru = (sflags == SDsampSpT |
| 524 |
< |
&& !(ndp->pr->crtype & (SPECULAR|AMBIENT)) |
| 525 |
< |
&& bright(ndp->cthru) > FTINY); |
| 523 |
> |
int hasthru = (sflags == SDsampSpT && |
| 524 |
> |
!(ndp->pr->crtype & (SPECULAR|AMBIENT)) |
| 525 |
> |
&& bright(ndp->cthru) > FTINY); |
| 526 |
|
int n, ntotal = 0; |
| 527 |
|
double b = 0; |
| 528 |
|
SDSpectralDF *dfp; |
| 557 |
|
} else |
| 558 |
|
hasthru = 0; |
| 559 |
|
} |
| 560 |
< |
if (dfp->maxHemi - b <= FTINY) { /* how specular to sample? */ |
| 560 |
> |
if (dfp->maxHemi - b <= FTINY) { /* have specular to sample? */ |
| 561 |
|
b = 0; |
| 562 |
|
} else { |
| 563 |
|
FVECT vjit; |
| 589 |
|
int |
| 590 |
|
m_bsdf(OBJREC *m, RAY *r) |
| 591 |
|
{ |
| 592 |
+ |
int hasthick = (m->otype == MAT_BSDF); |
| 593 |
|
int hitfront; |
| 594 |
|
COLOR ctmp; |
| 595 |
|
SDError ec; |
| 597 |
|
MFUNC *mf; |
| 598 |
|
BSDFDAT nd; |
| 599 |
|
/* check arguments */ |
| 600 |
< |
if ((m->oargs.nsargs < 6) | (m->oargs.nfargs > 9) | |
| 600 |
> |
if ((m->oargs.nsargs < hasthick+5) | (m->oargs.nfargs > 9) | |
| 601 |
|
(m->oargs.nfargs % 3)) |
| 602 |
|
objerror(m, USER, "bad # arguments"); |
| 603 |
|
/* record surface struck */ |
| 604 |
|
hitfront = (r->rod > 0); |
| 605 |
|
/* load cal file */ |
| 606 |
< |
mf = getfunc(m, 5, 0x1d, 1); |
| 606 |
> |
mf = hasthick ? getfunc(m, 5, 0x1d, 1) |
| 607 |
> |
: getfunc(m, 4, 0xe, 1) ; |
| 608 |
|
setfunc(m, r); |
| 609 |
< |
/* get thickness */ |
| 610 |
< |
nd.thick = evalue(mf->ep[0]); |
| 611 |
< |
if ((-FTINY <= nd.thick) & (nd.thick <= FTINY)) |
| 612 |
< |
nd.thick = 0; |
| 609 |
> |
nd.thick = 0; /* set thickness */ |
| 610 |
> |
if (hasthick) { |
| 611 |
> |
nd.thick = evalue(mf->ep[0]); |
| 612 |
> |
if ((-FTINY <= nd.thick) & (nd.thick <= FTINY)) |
| 613 |
> |
nd.thick = 0; |
| 614 |
> |
} |
| 615 |
|
/* check backface visibility */ |
| 616 |
|
if (!hitfront & !backvis) { |
| 617 |
|
raytrans(r); |
| 624 |
|
raytrans(r); /* hide our proxy */ |
| 625 |
|
return(1); |
| 626 |
|
} |
| 627 |
+ |
if (hasthick && r->crtype & SHADOW) /* early shadow check #1 */ |
| 628 |
+ |
return(1); |
| 629 |
|
nd.mp = m; |
| 630 |
|
nd.pr = r; |
| 631 |
|
/* get BSDF data */ |
| 632 |
< |
nd.sd = loadBSDF(m->oargs.sarg[1]); |
| 633 |
< |
/* early shadow check */ |
| 632 |
> |
nd.sd = loadBSDF(m->oargs.sarg[hasthick]); |
| 633 |
> |
/* early shadow check #2 */ |
| 634 |
|
if (r->crtype & SHADOW && (nd.sd->tf == NULL) & (nd.sd->tb == NULL)) |
| 635 |
|
return(1); |
| 636 |
|
/* diffuse reflectance */ |
| 665 |
|
multcolor(nd.rdiff, r->pcol); |
| 666 |
|
multcolor(nd.tdiff, r->pcol); |
| 667 |
|
/* get up vector */ |
| 668 |
< |
upvec[0] = evalue(mf->ep[1]); |
| 669 |
< |
upvec[1] = evalue(mf->ep[2]); |
| 670 |
< |
upvec[2] = evalue(mf->ep[3]); |
| 668 |
> |
upvec[0] = evalue(mf->ep[hasthick+0]); |
| 669 |
> |
upvec[1] = evalue(mf->ep[hasthick+1]); |
| 670 |
> |
upvec[2] = evalue(mf->ep[hasthick+2]); |
| 671 |
|
/* return to world coords */ |
| 672 |
|
if (mf->fxp != &unitxf) { |
| 673 |
|
multv3(upvec, upvec, mf->fxp->xfm); |
| 690 |
|
objerror(m, WARNING, "Illegal orientation vector"); |
| 691 |
|
return(1); |
| 692 |
|
} |
| 693 |
< |
compute_through(&nd); /* compute through component */ |
| 694 |
< |
if (r->crtype & SHADOW) { |
| 695 |
< |
RAY tr; /* attempt to pass shadow ray */ |
| 696 |
< |
if (rayorigin(&tr, TRANS, r, nd.cthru) < 0) |
| 697 |
< |
return(1); /* blocked */ |
| 698 |
< |
VCOPY(tr.rdir, r->rdir); |
| 699 |
< |
rayvalue(&tr); /* transmit with scaling */ |
| 700 |
< |
multcolor(tr.rcol, tr.rcoef); |
| 701 |
< |
copycolor(r->rcol, tr.rcol); |
| 702 |
< |
return(1); /* we're done */ |
| 693 |
> |
setcolor(nd.cthru, 0, 0, 0); /* consider through component */ |
| 694 |
> |
if (m->otype == MAT_SBSDF) { |
| 695 |
> |
compute_through(&nd); |
| 696 |
> |
if (r->crtype & SHADOW) { |
| 697 |
> |
RAY tr; /* attempt to pass shadow ray */ |
| 698 |
> |
if (rayorigin(&tr, TRANS, r, nd.cthru) < 0) |
| 699 |
> |
return(1); /* no through component */ |
| 700 |
> |
VCOPY(tr.rdir, r->rdir); |
| 701 |
> |
rayvalue(&tr); /* transmit with scaling */ |
| 702 |
> |
multcolor(tr.rcol, tr.rcoef); |
| 703 |
> |
copycolor(r->rcol, tr.rcol); |
| 704 |
> |
return(1); /* we're done */ |
| 705 |
> |
} |
| 706 |
|
} |
| 707 |
|
ec = SDinvXform(nd.fromloc, nd.toloc); |
| 708 |
|
if (!ec) /* determine BSDF resolution */ |
