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#include "otypes.h" |
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#include "rtotypes.h" |
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#include "func.h" |
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#include "pmapmat.h" |
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|
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/* |
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* Arguments to this material include the color and specularity. |
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* Arguments for MAT_TFUNC are: |
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* 2+ func funcfile transform |
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* 0 |
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* 4+ red grn blu rspec trans tspec A7 .. |
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* 6+ red grn blu rspec trans tspec A7 .. |
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* |
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* Arguments for MAT_TDATA are: |
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* 4+ func datafile funcfile v0 .. transform |
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* 0 |
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* 4+ red grn blu rspec trans tspec A7 .. |
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* 6+ red grn blu rspec trans tspec A7 .. |
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* |
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* Arguments for the more general MAT_BRTDF are: |
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* 10+ rrefl grefl brefl |
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} BRDFDAT; /* BRDF material data */ |
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|
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|
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static srcdirf_t dirbrdf; |
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static int setbrdfunc(BRDFDAT *np); |
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static int setbrdfunc(BRDFDAT *np); |
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|
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|
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static void |
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double omega /* light source size */ |
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) |
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{ |
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register BRDFDAT *np = nnp; |
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BRDFDAT *np = nnp; |
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double ldot; |
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double dtmp; |
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COLOR ctmp; |
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FVECT ldx; |
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static double vldx[5], pt[MAXDIM]; |
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register char **sa; |
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register int i; |
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char **sa; |
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int i; |
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#define lddx (vldx+1) |
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|
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setcolor(cval, 0.0, 0.0, 0.0); |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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if (ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY) |
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return; /* no specular component */ |
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if ((ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY) || |
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ambRayInPmap(np->pr)) |
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return; /* diffuse only */ |
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/* set up function */ |
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setbrdfunc(np); |
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sa = np->mp->oargs.sarg; |
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lddx[3] = omega; |
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/* compute BRTDF */ |
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if (np->mp->otype == MAT_BRTDF) { |
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if (sa[6][0] == '0') /* special case */ |
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if (sa[6][0] == '0' && !sa[6][1]) /* special case */ |
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colval(ctmp,RED) = 0.0; |
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else |
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colval(ctmp,RED) = funvalue(sa[6], 4, lddx); |
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if (!strcmp(sa[7],sa[6])) |
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if (sa[7][0] == '0' && !sa[7][1]) |
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colval(ctmp,GRN) = 0.0; |
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else 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], 4, lddx); |
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if (!strcmp(sa[8],sa[6])) |
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if (sa[8][0] == '0' && !sa[8][1]) |
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colval(ctmp,BLU) = 0.0; |
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else 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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dtmp = funvalue(sa[0], 5, vldx); |
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setcolor(ctmp, dtmp, dtmp, dtmp); |
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} |
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if (errno == EDOM || errno == ERANGE) { |
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if ((errno == EDOM) | (errno == ERANGE)) { |
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objerror(np->mp, WARNING, "compute error"); |
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return; |
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} |
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} |
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|
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extern int |
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int |
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m_brdf( /* color a ray that hit a BRDTfunc material */ |
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register OBJREC *m, |
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register RAY *r |
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OBJREC *m, |
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RAY *r |
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) |
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{ |
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int hitfront = 1; |
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BRDFDAT nd; |
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RAY sr; |
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double mirtest=0, mirdist=0; |
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double transtest, transdist; |
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double transtest=0, transdist=0; |
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int hasrefl, hastrans; |
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int hastexture; |
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COLOR ctmp; |
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FVECT vtmp; |
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double d; |
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register MFUNC *mf; |
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register int i; |
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MFUNC *mf; |
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int i; |
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/* check arguments */ |
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if ((m->oargs.nsargs < 10) | (m->oargs.nfargs < 9)) |
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objerror(m, USER, "bad # arguments"); |
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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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if (errno == EDOM || errno == ERANGE) |
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if ((errno == EDOM) | (errno == ERANGE)) |
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objerror(m, WARNING, "compute error"); |
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else if (rayorigin(&sr, r, TRANS, bright(ctmp)) == 0) { |
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else if (rayorigin(&sr, TRANS, r, ctmp) == 0) { |
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if (!(r->crtype & SHADOW) && hastexture) { |
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for (i = 0; i < 3; i++) /* perturb direction */ |
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sr.rdir[i] = r->rdir[i] - .75*r->pert[i]; |
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/* perturb direction */ |
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VSUM(sr.rdir, r->rdir, r->pert, -.75); |
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if (normalize(sr.rdir) == 0.0) { |
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objerror(m, WARNING, "illegal perturbation"); |
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VCOPY(sr.rdir, r->rdir); |
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VCOPY(sr.rdir, r->rdir); |
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} |
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rayvalue(&sr); |
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multcolor(sr.rcol, ctmp); |
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multcolor(sr.rcol, sr.rcoef); |
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addcolor(r->rcol, sr.rcol); |
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if (!hastexture) { |
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transtest = 2.0*bright(sr.rcol); |
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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 == EDOM || errno == ERANGE) |
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if ((errno == EDOM) | (errno == ERANGE)) |
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objerror(m, WARNING, "compute error"); |
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else if (rayorigin(&sr, r, REFLECTED, bright(ctmp)) == 0) { |
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for (i = 0; i < 3; i++) |
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sr.rdir[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i]; |
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else if (rayorigin(&sr, REFLECTED, r, ctmp) == 0) { |
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VSUM(sr.rdir, r->rdir, nd.pnorm, 2.*nd.pdot); |
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checknorm(sr.rdir); |
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rayvalue(&sr); |
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multcolor(sr.rcol, ctmp); |
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multcolor(sr.rcol, sr.rcoef); |
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addcolor(r->rcol, sr.rcol); |
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if (!hastexture && r->ro != NULL && isflat(r->ro->otype)) { |
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mirtest = 2.0*bright(sr.rcol); |
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if (hasrefl) { |
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if (!hitfront) |
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flipsurface(r); |
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ambient(ctmp, r, nd.pnorm); |
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multcolor(ctmp, nd.rdiff); |
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copycolor(ctmp, nd.rdiff); |
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multambient(ctmp, r, nd.pnorm); |
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addcolor(r->rcol, ctmp); /* add to returned color */ |
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if (!hitfront) |
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flipsurface(r); |
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vtmp[0] = -nd.pnorm[0]; |
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vtmp[1] = -nd.pnorm[1]; |
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vtmp[2] = -nd.pnorm[2]; |
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ambient(ctmp, r, vtmp); |
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multcolor(ctmp, nd.tdiff); |
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copycolor(ctmp, nd.tdiff); |
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multambient(ctmp, r, vtmp); |
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addcolor(r->rcol, ctmp); |
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if (hitfront) |
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flipsurface(r); |
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|
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|
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|
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extern int |
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> |
int |
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m_brdf2( /* color a ray that hit a BRDF material */ |
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register OBJREC *m, |
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< |
register RAY *r |
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> |
OBJREC *m, |
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RAY *r |
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) |
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{ |
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BRDFDAT nd; |
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objerror(m, USER, "bad # arguments"); |
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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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if (!backvis) { |
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raytrans(r); |
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return(1); |
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} |
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} |
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/* compute ambient */ |
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if (nd.trans < 1.0-FTINY) { |
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ambient(ctmp, r, nd.pnorm); |
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copycolor(ctmp, nd.mcolor); /* modified by material color */ |
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scalecolor(ctmp, 1.0-nd.trans); |
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multcolor(ctmp, nd.mcolor); /* modified by material color */ |
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multambient(ctmp, r, nd.pnorm); |
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addcolor(r->rcol, ctmp); /* add to returned color */ |
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} |
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if (nd.trans > FTINY) { /* from other side */ |
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vtmp[0] = -nd.pnorm[0]; |
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vtmp[1] = -nd.pnorm[1]; |
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vtmp[2] = -nd.pnorm[2]; |
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< |
ambient(ctmp, r, vtmp); |
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> |
copycolor(ctmp, nd.mcolor); |
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scalecolor(ctmp, nd.trans); |
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< |
multcolor(ctmp, nd.mcolor); |
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> |
multambient(ctmp, r, vtmp); |
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addcolor(r->rcol, ctmp); |
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flipsurface(r); |
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} |
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|
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static int |
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setbrdfunc( /* set up brdf function and variables */ |
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< |
register BRDFDAT *np |
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> |
BRDFDAT *np |
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) |
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{ |
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FVECT vec; |