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#include "func.h" |
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extern int backvis; /* back faces visible? */ |
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/* |
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* Arguments to this material include the color and specularity. |
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* String arguments include the reflection function and files. |
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* The BRDF is currently used just for the specular component to light |
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* sources. Reflectance values or data coordinates are functions |
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* of the direction to the light source. |
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* of the direction to the light source. (Data modification functions |
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* are passed the source direction as args 2-4.) |
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* We orient the surface towards the incoming ray, so a single |
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* surface can be used to represent an infinitely thin object. |
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* |
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COLOR ctmp; |
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FVECT ldx; |
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double lddx[3], pt[MAXDIM]; |
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double vldx[4]; |
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register char **sa; |
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register int i; |
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} else { |
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for (i = 0; i < np->dp->nd; i++) |
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pt[i] = funvalue(sa[3+i], 3, lddx); |
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dtmp = datavalue(np->dp, pt); |
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dtmp = funvalue(sa[0], 1, &dtmp); |
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vldx[0] = datavalue(np->dp, pt); |
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vldx[1] = lddx[0]; vldx[2] = lddx[1]; vldx[3] = lddx[2]; |
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dtmp = funvalue(sa[0], 4, vldx); |
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setcolor(ctmp, dtmp, dtmp, dtmp); |
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} |
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if (errno) { |
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double transtest, transdist; |
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int hasrefl, hastrans; |
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COLOR ctmp; |
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double dtmp; |
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register MFUNC *mf; |
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register int i; |
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/* check arguments */ |
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/* compute transmitted ray */ |
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setbrdfunc(&nd); |
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transtest = 0; |
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transdist = r->rot; |
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errno = 0; |
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setcolor(ctmp, evalue(mf->ep[3]), |
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evalue(mf->ep[4]), |
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transdist = r->rot + sr.rt; |
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} |
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if (r->crtype & SHADOW) /* the rest is shadow */ |
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return; |
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return(1); |
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/* compute reflected ray */ |
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setbrdfunc(&nd); |
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errno = 0; |
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/* check distance */ |
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if (transtest > bright(r->rcol)) |
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r->rt = transdist; |
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return(1); |
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} |
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double dtmp; |
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/* always a shadow */ |
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if (r->crtype & SHADOW) |
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return; |
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return(1); |
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/* check arguments */ |
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if (m->oargs.nsargs < (hasdata(m->otype)?4:2) | m->oargs.nfargs < |
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(m->otype==MAT_TFUNC|m->otype==MAT_TDATA?6:4)) |
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/* compute reflectance */ |
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dtmp = 1.0 - nd.trans - nd.rspec; |
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setcolor(nd.rdiff, dtmp, dtmp, dtmp); |
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/* fix orientation */ |
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if (r->rod < 0.0) |
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flipsurface(r); |
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/* check for back side */ |
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if (r->rod < 0.0) { |
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if (!backvis && m->otype != MAT_TFUNC |
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&& m->otype != MAT_TDATA) { |
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raytrans(r); |
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return(1); |
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} |
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flipsurface(r); /* reorient if backvis */ |
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} |
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/* get modifiers */ |
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raytexture(r, m->omod); |
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nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
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} |
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/* add direct component */ |
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direct(r, dirbrdf, &nd); |
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return(1); |
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} |
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