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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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{ |
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register SPOT *ns; |
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|
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if ((ns = (SPOT *)m->os) != NULL) |
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return(ns); |
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if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
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return(NULL); |
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ns->siz = 2.0*PI * (1.0 - cos(PI/180.0/2.0 * m->oargs.farg[3])); |
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VCOPY(ns->aim, m->oargs.farg+4); |
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if ((ns->flen = normalize(ns->aim)) == 0.0) |
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objerror(m, USER, "zero focus vector"); |
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m->os = (char *)ns; |
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return(ns); |
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} |
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spotout(r, s, dist) /* check if we're outside spot region */ |
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register RAY *r; |
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register SPOT *s; |
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int dist; |
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{ |
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double d; |
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FVECT vd; |
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|
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if (s == NULL) |
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return(0); |
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if (dist) { /* distant source */ |
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vd[0] = s->aim[0] - r->rorg[0]; |
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vd[1] = s->aim[1] - r->rorg[1]; |
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vd[2] = s->aim[2] - r->rorg[2]; |
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d = DOT(r->rdir,vd); |
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/* wrong side? |
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if (d <= FTINY) |
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return(1); */ |
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d = DOT(vd,vd) - d*d; |
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if (PI*d > s->siz) |
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return(1); /* out */ |
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return(0); /* OK */ |
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} |
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/* local source */ |
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if (s->siz < 2.0*PI * (1.0 + DOT(s->aim,r->rdir))) |
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return(1); /* out */ |
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return(0); /* OK */ |
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} |
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|
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|
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double |
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fgetmaxdisk(ocent, op) /* get center and squared radius of face */ |
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FVECT ocent; |
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return(1); |
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} |
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return(0); |
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} |
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|
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/**************************************************************** |
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* The following macros were separated from the m_light() routine |
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* because they are very nasty and difficult to understand. |
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*/ |
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|
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/* wrongillum * |
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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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*/ |
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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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|
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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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*/ |
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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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|
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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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*/ |
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|
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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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|
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/* badambient * |
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* |
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* We must avoid including 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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*/ |
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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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|
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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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* on purpose (as part of a direct calculation), or it is relaying |
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* a virtual light source. |
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*/ |
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|
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#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
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(r->rsrc<0 || source[r->rsrc].so!=r->ro || \ |
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source[r->rsrc].sflags&SVIRTUAL)) |
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|
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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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*/ |
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|
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#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
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!distglow(m, r)) |
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|
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|
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m_light(m, r) /* ray hit a light source */ |
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register OBJREC *m; |
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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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return; |
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/* check for passed illum */ |
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if (passillum(m, r)) { |
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if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
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raytrans(r); |
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else |
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rayshade(r, modifier(m->oargs.sarg[0])); |
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return; |
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} |
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/* otherwise treat as source */ |
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/* check for behind */ |
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if (r->rod < 0.0) |
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return; |
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/* check for invisibility */ |
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if (srcignore(m, r)) |
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return; |
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/* get distribution pattern */ |
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raytexture(r, m->omod); |
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/* get source color */ |
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setcolor(r->rcol, m->oargs.farg[0], |
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m->oargs.farg[1], |
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m->oargs.farg[2]); |
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/* modify value */ |
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multcolor(r->rcol, r->pcol); |
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} |
