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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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if (m->otype == MAT_GLOW) { |
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source[ns].sflags |= SPROX; |
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source[ns].sl.prox = m->oargs.farg[3]; |
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if (o->otype == OBJ_SOURCE) |
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if (source[ns].sflags & SDISTANT) |
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source[ns].sflags |= SSKIP; |
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} else if (m->otype == MAT_SPOT) { |
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source[ns].sflags |= SSPOT; |
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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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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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m->oargs.farg[3] >= -FTINY && \ |
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r->rot > m->oargs.farg[3]) |
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/* badcomponent * |
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/* srcignore * |
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* |
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* The -di flag renders light sources invisible, and here is the test. |
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* The -dv flag is normally on for sources to be visible. |
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*/ |
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#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
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#define srcignore(m, r) (!directvis && !(r->crtype&SHADOW) && \ |
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!distglow(m, r)) |
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if (srcignore(m, r)) |
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return; |
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/* check for outside spot */ |
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if (m->otype==MAT_SPOT && spotout(r, (SPOT *)m->os, r->rot>=FHUGE)) |
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if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) |
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return; |
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/* get distribution pattern */ |
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raytexture(r, m->omod); |