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#include "otypes.h" |
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#include "func.h" |
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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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* CrP, CgP, CbP - perturbed material color |
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*/ |
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|
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extern double funvalue(), varvalue(); |
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extern XF funcxf; |
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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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double dtmp; |
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COLOR ctmp; |
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FVECT ldx; |
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double pt[MAXDIM]; |
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double lddx[3], pt[MAXDIM]; |
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register char **sa; |
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register int i; |
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|
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if (ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY) |
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return; /* no specular component */ |
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/* set up function */ |
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setfunc(np->mp, np->pr); |
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setbrdfunc(np); |
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sa = np->mp->oargs.sarg; |
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errno = 0; |
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/* transform light vector */ |
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multv3(ldx, ldir, funcxf.xfm); |
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for (i = 0; i < 3; i++) |
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ldx[i] /= funcxf.sca; |
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lddx[i] = ldx[i]/funcxf.sca; |
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/* compute BRTDF */ |
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if (np->mp->otype == MAT_BRTDF) { |
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colval(ctmp,RED) = funvalue(sa[6], 3, ldx); |
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colval(ctmp,RED) = funvalue(sa[6], 3, lddx); |
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if (!strcmp(sa[7],sa[6])) |
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colval(ctmp,GRN) = colval(ctmp,RED); |
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else |
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colval(ctmp,GRN) = funvalue(sa[7], 3, ldx); |
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colval(ctmp,GRN) = funvalue(sa[7], 3, lddx); |
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if (!strcmp(sa[8],sa[6])) |
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colval(ctmp,BLU) = colval(ctmp,RED); |
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else if (!strcmp(sa[8],sa[7])) |
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colval(ctmp,BLU) = colval(ctmp,GRN); |
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else |
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colval(ctmp,BLU) = funvalue(sa[8], 3, ldx); |
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colval(ctmp,BLU) = funvalue(sa[8], 3, lddx); |
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dtmp = bright(ctmp); |
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} else if (np->dp == NULL) { |
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dtmp = funvalue(sa[0], 3, ldx); |
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dtmp = funvalue(sa[0], 3, lddx); |
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setcolor(ctmp, dtmp, dtmp, dtmp); |
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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, ldx); |
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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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setcolor(ctmp, dtmp, dtmp, dtmp); |
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} |
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if (errno) |
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goto computerr; |
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if (errno) { |
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objerror(np->mp, WARNING, "compute error"); |
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return; |
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} |
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if (dtmp <= FTINY) |
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return; |
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if (ldot > 0.0) { |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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return; |
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computerr: |
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objerror(np->mp, WARNING, "compute error"); |
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return; |
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} |
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BRDFDAT nd; |
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double transtest, transdist; |
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COLOR ctmp; |
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double dtmp; |
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FVECT vec; |
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double dtmp, tspect, rspecr; |
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MFUNC *mf; |
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register int i; |
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/* check arguments */ |
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switch (m->otype) { |
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raytexture(r, m->omod); |
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nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
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multcolor(nd.mcolor, r->pcol); /* modify material color */ |
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r->rt = r->rot; /* default ray length */ |
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transtest = 0; |
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/* load auxiliary files */ |
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if (m->otype == MAT_PDATA || m->otype == MAT_MDATA |
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|| m->otype == MAT_TDATA) { |
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if (hasdata(m->otype)) { |
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nd.dp = getdata(m->oargs.sarg[1]); |
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for (i = 3; i < m->oargs.nsargs; i++) |
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if (m->oargs.sarg[i][0] == '-') |
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break; |
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if (i-3 != nd.dp->nd) |
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objerror(m, USER, "dimension error"); |
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if (!fundefined(m->oargs.sarg[3])) |
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loadfunc(m->oargs.sarg[2]); |
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i = (1 << nd.dp->nd) - 1; |
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mf = getfunc(m, 2, i<<3, 0); |
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} else if (m->otype == MAT_BRTDF) { |
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nd.dp = NULL; |
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if (!fundefined(m->oargs.sarg[7])) |
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loadfunc(m->oargs.sarg[9]); |
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mf = getfunc(m, 9, 0x3f, 0); |
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} else { |
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nd.dp = NULL; |
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if (!fundefined(m->oargs.sarg[0])) |
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loadfunc(m->oargs.sarg[1]); |
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mf = getfunc(m, 1, 0, 0); |
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} |
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/* set special variables */ |
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setfunc(m, r); |
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multv3(vec, nd.pnorm, funcxf.xfm); |
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varset("NxP", '=', vec[0]/funcxf.sca); |
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varset("NyP", '=', vec[1]/funcxf.sca); |
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varset("NzP", '=', vec[2]/funcxf.sca); |
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varset("RdotP", '=', nd.pdot); |
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varset("CrP", '=', colval(nd.mcolor,RED)); |
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varset("CgP", '=', colval(nd.mcolor,GRN)); |
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varset("CbP", '=', colval(nd.mcolor,BLU)); |
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setbrdfunc(&nd); |
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/* compute transmitted ray */ |
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tspect = 0.; |
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if (m->otype == MAT_BRTDF && nd.tspec > FTINY) { |
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RAY sr; |
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errno = 0; |
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setcolor(ctmp, varvalue(m->oargs.sarg[0]), |
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varvalue(m->oargs.sarg[1]), |
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varvalue(m->oargs.sarg[2])); |
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scalecolor(ctmp, nd.tspec); |
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setcolor(ctmp, evalue(mf->ep[3]), |
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evalue(mf->ep[4]), |
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evalue(mf->ep[5])); |
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scalecolor(ctmp, nd.trans); |
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if (errno) |
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objerror(m, WARNING, "compute error"); |
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else if ((dtmp = bright(ctmp)) > FTINY && |
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rayorigin(&sr, r, TRANS, dtmp) == 0) { |
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if (DOT(r->pert,r->pert) > FTINY*FTINY) { |
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else if ((tspect = bright(ctmp)) > FTINY && |
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rayorigin(&sr, r, TRANS, tspect) == 0) { |
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if (!(r->crtype & SHADOW) && |
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DOT(r->pert,r->pert) > FTINY*FTINY) { |
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for (i = 0; i < 3; i++) /* perturb direction */ |
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sr.rdir[i] = r->rdir[i] - |
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.75*r->pert[i]; |
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normalize(sr.rdir); |
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} else |
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} else { |
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VCOPY(sr.rdir, r->rdir); |
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transtest = 2; |
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} |
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rayvalue(&sr); |
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multcolor(sr.rcol, ctmp); |
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addcolor(r->rcol, sr.rcol); |
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if (r->crtype & SHADOW) /* the rest is shadow */ |
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return; |
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/* compute reflected ray */ |
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rspecr = 0.; |
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if (m->otype == MAT_BRTDF && nd.rspec > FTINY) { |
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RAY sr; |
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errno = 0; |
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setcolor(ctmp, varvalue(m->oargs.sarg[3]), |
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varvalue(m->oargs.sarg[4]), |
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varvalue(m->oargs.sarg[5])); |
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scalecolor(ctmp, nd.rspec); |
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setcolor(ctmp, evalue(mf->ep[0]), |
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evalue(mf->ep[1]), |
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evalue(mf->ep[2])); |
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if (errno) |
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objerror(m, WARNING, "compute error"); |
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else if ((dtmp = bright(ctmp)) > FTINY && |
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rayorigin(&sr, r, REFLECTED, dtmp) == 0) { |
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else if ((rspecr = bright(ctmp)) > FTINY && |
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rayorigin(&sr, r, REFLECTED, rspecr) == 0) { |
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for (i = 0; i < 3; i++) |
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sr.rdir[i] = r->rdir[i] + |
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2.0*nd.pdot*nd.pnorm[i]; |
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} |
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} |
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/* compute ambient */ |
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if (nd.rdiff > FTINY) { |
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if ((dtmp = 1.0-nd.trans-rspecr) > FTINY) { |
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ambient(ctmp, r); |
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if (m->otype == MAT_BRTDF) |
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scalecolor(ctmp, nd.rdiff); |
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else |
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scalecolor(ctmp, 1.0-nd.trans); |
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> |
scalecolor(ctmp, dtmp); |
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multcolor(ctmp, nd.mcolor); /* modified by material color */ |
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addcolor(r->rcol, ctmp); /* add to returned color */ |
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} |
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if (nd.tdiff > FTINY) { /* from other side */ |
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> |
if ((dtmp = nd.trans-tspect) > FTINY) { /* from other side */ |
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flipsurface(r); |
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ambient(ctmp, r); |
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< |
if (m->otype == MAT_BRTDF) |
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< |
scalecolor(ctmp, nd.tdiff); |
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else |
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< |
scalecolor(ctmp, nd.trans); |
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scalecolor(ctmp, dtmp); |
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multcolor(ctmp, nd.mcolor); |
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addcolor(r->rcol, ctmp); |
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flipsurface(r); |
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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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} |
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|
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|
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setbrdfunc(np) /* set up brdf function and variables */ |
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register BRDFDAT *np; |
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{ |
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FVECT vec; |
331 |
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|
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if (setfunc(np->mp, np->pr) == 0) |
333 |
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return(0); /* it's OK, setfunc says we're done */ |
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/* else (re)assign special variables */ |
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multv3(vec, np->pnorm, funcxf.xfm); |
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varset("NxP", '=', vec[0]/funcxf.sca); |
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varset("NyP", '=', vec[1]/funcxf.sca); |
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varset("NzP", '=', vec[2]/funcxf.sca); |
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varset("RdotP", '=', np->pdot <= -1.0 ? -1.0 : |
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np->pdot >= 1.0 ? 1.0 : np->pdot); |
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varset("CrP", '=', colval(np->mcolor,RED)); |
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varset("CgP", '=', colval(np->mcolor,GRN)); |
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varset("CbP", '=', colval(np->mcolor,BLU)); |
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return(1); |
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} |