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/* Copyright (c) 1991 Regents of the University of California */ |
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/* Copyright (c) 1992 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#define distglow(m, r) (m->otype==MAT_GLOW && \ |
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r->rot > m->oargs.farg[3]) |
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/* badambient * |
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/* badcomponent * |
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* |
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* We must avoid including counting light sources in the ambient calculation, |
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* We must avoid counting light sources in the ambient calculation, |
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* since the direct component is handled separately. Therefore, any |
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* ambient ray which hits an active light source must be discarded. |
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* The same is true for stray specular samples, since the specular |
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* contribution from light sources is calculated separately. |
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*/ |
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#define badambient(m, r) ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \ |
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!distglow(m, r)) |
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#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
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!(r->crtype&SHADOW || r->rod < 0.0 || \ |
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distglow(m, r))) |
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/* overcount * |
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* |
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* All overcounting possibilities are contained here. |
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*/ |
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#define overcount(m, r) (badcomponent(m,r) || wrongsource(m,r)) |
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/* passillum * |
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* |
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* An illum passes to another material type when we didn't hit it |
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register RAY *r; |
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{ |
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/* check for over-counting */ |
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if (wrongsource(m, r) || badambient(m, r)) |
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if (overcount(m, r)) |
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return; |
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/* check for passed illum */ |
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if (passillum(m, r)) { |
