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/* Copyright (c) 1992 Regents of the University of California */ |
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/* Copyright (c) 1993 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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* because they are very nasty and difficult to understand. |
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*/ |
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/* wrongillum * |
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/* illumblock * |
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* |
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* We cannot allow an illum to pass to another illum, because that |
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* would almost certainly constitute overcounting. |
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* However, we do allow an illum to pass to another illum |
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* that is actually going to relay to a virtual light source. |
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* We also prevent an illum from passing to a glow; this provides a |
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* convenient mechanism for defining detailed light source |
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* geometry behind (or inside) an effective radiator. |
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*/ |
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#define wrongillum(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
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objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM) |
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static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
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{register OBJREC *o = objptr(obj); |
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return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
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#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
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r->rod > 0.0 && \ |
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weaksrcmod(source[r->rsrc].so->omod)) |
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/* wrongsource * |
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* |
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* This source is the wrong source (ie. overcounted) if we are |
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* aimed to a different source than the one we hit and the one |
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* we hit is not an illum which should be passed. |
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* we hit is not an illum that should be passed. |
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*/ |
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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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(m->otype!=MAT_ILLUM || illumblock(m,r))) |
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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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* but is too far away from the test point to be one in this case. |
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* (Glows with negative radii should NEVER participate in illumination.) |
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*/ |
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#define distglow(m, r) (m->otype==MAT_GLOW && \ |
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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 (overcount(m, r)) |
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if (badcomponent(m, r)) |
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return; |
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if (wrongsource(m,r)) |
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return; |
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/* check for passed illum */ |
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if (passillum(m, r)) { |
