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greg |
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#ifndef lint
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static const char RCSid[] = "$Id$";
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#endif
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/*
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* Shading for materials with BSDFs taken from XML data files
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*/
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#include "copyright.h"
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#include "ray.h"
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#include "paths.h"
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#include "ambient.h"
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#include "source.h"
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#include "func.h"
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#include "bsdf.h"
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#include "random.h"
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/*
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* Arguments to this material include optional diffuse colors.
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* String arguments include the BSDF and function files.
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* A thickness variable causes the strange but useful behavior
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* of translating transmitted rays this distance past the surface
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* intersection in the normal direction to bypass intervening geometry.
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* This only affects scattered, non-source directed samples. Thus,
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* thickness is relevant only if there is a transmitted component.
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* A positive thickness has the further side-effect that an unscattered
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* (view) ray will pass right through our material if it has any
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* non-diffuse transmission, making our BSDF invisible. This allows the
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* underlying geometry to become visible. A matching surface should be
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* placed on the other side, less than the thickness away, if the backside
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* reflectance is non-zero.
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* The "up" vector for the BSDF is given by three variables, defined
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* (along with the thickness) by the named function file, or '.' if none.
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* Together with the surface normal, this defines the local coordinate
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* system for the BSDF.
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* We do not reorient the surface, so if the BSDF has no back-side
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* reflectance and none is given in the real arguments, the surface will
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* appear as black when viewed from behind (unless backvis is false).
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* The diffuse compnent arguments are added to components in the BSDF file,
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* not multiplied. However, patterns affect this material as a multiplier
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* on everything except non-diffuse reflection.
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*
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* Arguments for MAT_BSDF are:
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* 6+ thick BSDFfile ux uy uz funcfile transform
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* 0
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* 0|3|9 rdf gdf bdf
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* rdb gdb bdb
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* rdt gdt bdt
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*/
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typedef struct {
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OBJREC *mp; /* material pointer */
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RAY *pr; /* intersected ray */
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FVECT pnorm; /* perturbed surface normal */
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FVECT vinc; /* local incident vector */
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RREAL toloc[3][3]; /* world to local BSDF coords */
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RREAL fromloc[3][3]; /* local BSDF coords to world */
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double thick; /* surface thickness */
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SDData *sd; /* loaded BSDF data */
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COLOR runsamp; /* BSDF hemispherical reflection */
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COLOR rdiff; /* added diffuse reflection */
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COLOR tunsamp; /* BSDF hemispherical transmission */
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COLOR tdiff; /* added diffuse transmission */
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} BSDFDAT; /* BSDF material data */
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#define cvt_sdcolor(cv, svp) ccy2rgb(&(svp)->spec, (svp)->cieY, cv)
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/* Convert error from BSDF library */
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static char *
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cvt_sderr(SDError ec)
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{
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if (!SDerrorDetail[0])
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return(strcpy(errmsg, SDerrorEnglish[ec]));
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sprintf(errmsg, "%s: %s", SDerrorEnglish[ec], SDerrorDetail);
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return(errmsg);
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}
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/* Compute source contribution for BSDF */
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static void
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dirbsdf(
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COLOR cval, /* returned coefficient */
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void *nnp, /* material data */
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FVECT ldir, /* light source direction */
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double omega /* light source size */
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)
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{
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BSDFDAT *np = nnp;
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SDError ec;
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SDValue sv;
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FVECT vout;
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double ldot;
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double dtmp;
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COLOR ctmp;
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setcolor(cval, .0, .0, .0);
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ldot = DOT(np->pnorm, ldir);
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if ((-FTINY <= ldot) & (ldot <= FTINY))
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return;
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if (ldot > .0 && bright(np->rdiff) > FTINY) {
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/*
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* Compute added diffuse reflected component.
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*/
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copycolor(ctmp, np->rdiff);
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dtmp = ldot * omega * (1./PI);
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scalecolor(ctmp, dtmp);
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addcolor(cval, ctmp);
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}
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if (ldot < .0 && bright(np->tdiff) > FTINY) {
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/*
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* Compute added diffuse transmission.
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*/
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copycolor(ctmp, np->tdiff);
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dtmp = -ldot * omega * (1.0/PI);
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scalecolor(ctmp, dtmp);
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addcolor(cval, ctmp);
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}
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/*
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* Compute scattering coefficient using BSDF.
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*/
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if (SDmapDir(vout, np->toloc, ldir) != SDEnone)
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return;
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ec = SDevalBSDF(&sv, vout, np->vinc, np->sd);
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if (ec)
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objerror(np->mp, USER, cvt_sderr(ec));
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if (sv.cieY <= FTINY) /* not worth using? */
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return;
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cvt_sdcolor(ctmp, &sv);
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if (ldot > .0) { /* pattern only diffuse reflection */
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COLOR ctmp1, ctmp2;
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dtmp = (np->pr->rod > .0) ? np->sd->rLambFront.cieY
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: np->sd->rLambBack.cieY;
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dtmp /= PI * sv.cieY; /* diffuse fraction */
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copycolor(ctmp2, np->pr->pcol);
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scalecolor(ctmp2, dtmp);
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setcolor(ctmp1, 1.-dtmp, 1.-dtmp, 1.-dtmp);
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addcolor(ctmp1, ctmp2);
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multcolor(ctmp, ctmp1); /* apply desaturated pattern */
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dtmp = ldot * omega;
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} else { /* full pattern on transmission */
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multcolor(ctmp, np->pr->pcol);
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dtmp = -ldot * omega;
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}
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scalecolor(ctmp, dtmp);
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addcolor(cval, ctmp);
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}
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/* Sample separate BSDF component */
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static int
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sample_sdcomp(BSDFDAT *ndp, SDComponent *dcp, int usepat)
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{
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int nstarget = 1;
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int nsent = 0;
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SDError ec;
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SDValue bsv;
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double sthick;
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FVECT vout;
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RAY sr;
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int ntrials;
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/* multiple samples? */
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if (specjitter > 1.5) {
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nstarget = specjitter*ndp->pr->rweight + .5;
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if (nstarget < 1)
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nstarget = 1;
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}
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/* run through our trials */
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for (ntrials = 0; nsent < nstarget && ntrials < 9*nstarget; ntrials++) {
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SDerrorDetail[0] = '\0';
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/* sample direction & coef. */
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ec = SDsampComponent(&bsv, vout, ndp->vinc,
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ntrials ? frandom()
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: urand(ilhash(dimlist,ndims)+samplendx),
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dcp);
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if (ec)
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objerror(ndp->mp, USER, cvt_sderr(ec));
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/* zero component? */
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if (bsv.cieY <= FTINY)
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break;
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/* map vector to world */
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if (SDmapDir(sr.rdir, ndp->fromloc, vout) != SDEnone)
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break;
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/* unintentional penetration? */
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if (DOT(sr.rdir, ndp->pr->ron) > .0 ^ vout[2] > .0)
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continue;
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/* spawn a specular ray */
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if (nstarget > 1)
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bsv.cieY /= (double)nstarget;
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cvt_sdcolor(sr.rcoef, &bsv); /* use color */
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if (usepat) /* pattern on transmission */
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multcolor(sr.rcoef, ndp->pr->pcol);
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if (rayorigin(&sr, SPECULAR, ndp->pr, sr.rcoef) < 0) {
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if (maxdepth > 0)
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break;
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++nsent; /* Russian roulette victim */
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continue;
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}
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/* need to move origin? */
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sthick = (ndp->pr->rod > .0) ? -ndp->thick : ndp->thick;
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if (sthick < .0 ^ vout[2] > .0)
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VSUM(sr.rorg, sr.rorg, ndp->pr->ron, sthick);
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| 204 |
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rayvalue(&sr); /* send & evaluate sample */
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multcolor(sr.rcol, sr.rcoef);
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addcolor(ndp->pr->rcol, sr.rcol);
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++nsent;
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}
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return(nsent);
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}
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| 211 |
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| 212 |
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/* Sample non-diffuse components of BSDF */
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static int
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sample_sdf(BSDFDAT *ndp, int sflags)
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{
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int n, ntotal = 0;
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SDSpectralDF *dfp;
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COLORV *unsc;
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| 220 |
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if (sflags == SDsampSpT) {
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unsc = ndp->tunsamp;
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dfp = ndp->sd->tf;
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cvt_sdcolor(unsc, &ndp->sd->tLamb);
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} else /* sflags == SDsampSpR */ {
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unsc = ndp->runsamp;
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| 226 |
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if (ndp->pr->rod > .0) {
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dfp = ndp->sd->rf;
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cvt_sdcolor(unsc, &ndp->sd->rLambFront);
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} else {
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| 230 |
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dfp = ndp->sd->rb;
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cvt_sdcolor(unsc, &ndp->sd->rLambBack);
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}
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| 233 |
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}
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| 234 |
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multcolor(unsc, ndp->pr->pcol);
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| 235 |
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if (dfp == NULL) /* no specular component? */
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| 236 |
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return(0);
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| 237 |
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/* below sampling threshold? */
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| 238 |
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if (dfp->maxHemi <= specthresh+FTINY) {
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| 239 |
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if (dfp->maxHemi > FTINY) { /* XXX no color from BSDF! */
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| 240 |
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double d = SDdirectHemi(ndp->vinc, sflags, ndp->sd);
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| 241 |
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COLOR ctmp;
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| 242 |
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if (sflags == SDsampSpT) {
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| 243 |
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copycolor(ctmp, ndp->pr->pcol);
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| 244 |
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scalecolor(ctmp, d);
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| 245 |
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} else /* no pattern on reflection */
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| 246 |
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setcolor(ctmp, d, d, d);
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addcolor(unsc, ctmp);
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}
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| 249 |
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return(0);
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| 250 |
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}
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| 251 |
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/* else need to sample */
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| 252 |
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dimlist[ndims++] = (int)(size_t)ndp->mp;
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| 253 |
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ndims++;
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| 254 |
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for (n = dfp->ncomp; n--; ) { /* loop over components */
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| 255 |
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dimlist[ndims-1] = n + 9438;
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| 256 |
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ntotal += sample_sdcomp(ndp, &dfp->comp[n], sflags==SDsampSpT);
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| 257 |
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}
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| 258 |
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ndims -= 2;
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| 259 |
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return(ntotal);
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| 260 |
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}
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| 261 |
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| 262 |
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/* Color a ray that hit a BSDF material */
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| 263 |
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int
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| 264 |
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m_bsdf(OBJREC *m, RAY *r)
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| 265 |
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{
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| 266 |
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COLOR ctmp;
|
| 267 |
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SDError ec;
|
| 268 |
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FVECT upvec, outVec;
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| 269 |
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MFUNC *mf;
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| 270 |
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BSDFDAT nd;
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| 271 |
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/* check arguments */
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| 272 |
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if ((m->oargs.nsargs < 6) | (m->oargs.nfargs > 9) |
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| 273 |
|
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(m->oargs.nfargs % 3))
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| 274 |
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objerror(m, USER, "bad # arguments");
|
| 275 |
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|
| 276 |
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SDerrorDetail[0] = '\0'; /* get BSDF data */
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| 277 |
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nd.sd = SDgetCache(m->oargs.sarg[1]);
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| 278 |
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if (nd.sd == NULL)
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| 279 |
|
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error(SYSTEM, "out of memory in m_bsdf");
|
| 280 |
|
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if (!SDisLoaded(nd.sd)) {
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| 281 |
|
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char *pname = getpath(m->oargs.sarg[1], getrlibpath(), R_OK);
|
| 282 |
|
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if (pname == NULL) {
|
| 283 |
|
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sprintf(errmsg, "cannot find BSDF file \"%s\"",
|
| 284 |
|
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m->oargs.sarg[1]);
|
| 285 |
|
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objerror(m, USER, errmsg);
|
| 286 |
|
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}
|
| 287 |
|
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ec = SDloadFile(nd.sd, pname);
|
| 288 |
|
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if (ec)
|
| 289 |
|
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objerror(m, USER, cvt_sderr(ec));
|
| 290 |
|
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SDretainSet = SDretainAll;
|
| 291 |
|
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}
|
| 292 |
|
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/* load cal file */
|
| 293 |
|
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mf = getfunc(m, 5, 0x1d, 1);
|
| 294 |
|
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/* get thickness */
|
| 295 |
|
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nd.thick = evalue(mf->ep[0]);
|
| 296 |
|
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if (nd.thick < .0)
|
| 297 |
|
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nd.thick = .0;
|
| 298 |
|
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/* check shadow */
|
| 299 |
|
|
if (r->crtype & SHADOW) {
|
| 300 |
|
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SDfreeCache(nd.sd);
|
| 301 |
|
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if (nd.thick > FTINY && nd.sd->tf != NULL &&
|
| 302 |
|
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nd.sd->tf->maxHemi > FTINY)
|
| 303 |
|
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raytrans(r); /* pass-through */
|
| 304 |
|
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return(1); /* else shadow */
|
| 305 |
|
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}
|
| 306 |
|
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/* check unscattered ray */
|
| 307 |
|
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if (!(r->crtype & (SPECULAR|AMBIENT)) && nd.thick > FTINY &&
|
| 308 |
|
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nd.sd->tf != NULL && nd.sd->tf->maxHemi > FTINY) {
|
| 309 |
|
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SDfreeCache(nd.sd);
|
| 310 |
|
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raytrans(r); /* pass-through */
|
| 311 |
|
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return(1);
|
| 312 |
|
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}
|
| 313 |
|
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/* diffuse reflectance */
|
| 314 |
|
|
if (r->rod > .0) {
|
| 315 |
|
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if (m->oargs.nfargs < 3)
|
| 316 |
|
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setcolor(nd.rdiff, .0, .0, .0);
|
| 317 |
|
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else
|
| 318 |
|
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setcolor(nd.rdiff, m->oargs.farg[0],
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| 319 |
|
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m->oargs.farg[1],
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| 320 |
|
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m->oargs.farg[2]);
|
| 321 |
|
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} else {
|
| 322 |
|
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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 |
|
|
}
|
