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#include "copyright.h" |
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#include "ray.h" |
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#include "ambient.h" |
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#include "data.h" |
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#include "source.h" |
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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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/* |
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} BRDFDAT; /* BRDF material data */ |
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static srcdirf_t dirbrdf; |
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static int setbrdfunc(BRDFDAT *np); |
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static void |
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dirbrdf(cval, np, ldir, omega) /* compute source contribution */ |
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COLOR cval; /* returned coefficient */ |
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register BRDFDAT *np; /* material data */ |
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FVECT ldir; /* light source direction */ |
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double omega; /* light source size */ |
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dirbrdf( /* compute source contribution */ |
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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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register 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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/* |
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* Compute reflected non-diffuse component. |
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*/ |
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if (np->mp->otype == MAT_MFUNC | np->mp->otype == MAT_MDATA) |
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if ((np->mp->otype == MAT_MFUNC) | (np->mp->otype == MAT_MDATA)) |
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multcolor(ctmp, np->mcolor); |
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dtmp = ldot * omega * np->rspec; |
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scalecolor(ctmp, dtmp); |
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/* |
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* Compute transmitted non-diffuse component. |
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*/ |
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if (np->mp->otype == MAT_TFUNC | np->mp->otype == MAT_TDATA) |
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if ((np->mp->otype == MAT_TFUNC) | (np->mp->otype == MAT_TDATA)) |
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multcolor(ctmp, np->mcolor); |
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dtmp = -ldot * omega * np->tspec; |
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scalecolor(ctmp, dtmp); |
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} |
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int |
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m_brdf(m, r) /* 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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extern 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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) |
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{ |
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int hitfront = 1; |
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BRDFDAT nd; |
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register MFUNC *mf; |
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register 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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if ((m->oargs.nsargs < 10) | (m->oargs.nfargs < 9)) |
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objerror(m, USER, "bad # arguments"); |
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nd.mp = m; |
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nd.pr = r; |
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int |
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m_brdf2(m, r) /* 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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extern 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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) |
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{ |
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BRDFDAT nd; |
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COLOR ctmp; |
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if (r->crtype & SHADOW) |
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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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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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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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/* get specular component */ |
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nd.rspec = m->oargs.farg[3]; |
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/* compute transmittance */ |
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if (m->otype == MAT_TFUNC | m->otype == MAT_TDATA) { |
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if ((m->otype == MAT_TFUNC) | (m->otype == MAT_TDATA)) { |
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nd.trans = m->oargs.farg[4]*(1.0 - nd.rspec); |
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nd.tspec = nd.trans * m->oargs.farg[5]; |
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dtmp = nd.trans - nd.tspec; |
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} |
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int |
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setbrdfunc(np) /* set up brdf function and variables */ |
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register BRDFDAT *np; |
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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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) |
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{ |
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FVECT vec; |
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