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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 wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
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(m->otype!=MAT_ILLUM || wrongillum(m,r))) |
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/* badspecular * |
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* |
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* Any undirected specular ray that hits a light source |
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* should be discarded. This is because the source contribution to |
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* specular components is calculated separately to reduce variance. |
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*/ |
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#define badspecular(m, r) (r->rsrc<0 && r->crtype&SPECULAR) |
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/* distglow * |
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* |
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* A distant glow is an object that sometimes acts as a light source, |
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#define badambient(m, r) ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \ |
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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) (badspecular(m,r) || wrongsource(m,r) || \ |
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badambient(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)) { |
