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/* Copyright (c) 1986 Regents of the University of California */ |
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/* Copyright (c) 1990 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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#include "ray.h" |
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#include "octree.h" |
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|
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#include "source.h" |
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#include "otypes.h" |
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extern double dstrsrc; /* source distribution amount */ |
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extern double shadthresh; /* relative shadow threshold */ |
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extern double shadcert; /* shadow testing certainty */ |
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|
32 |
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SOURCE srcval[MAXSOURCE]; /* our array of sources */ |
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SRCREC *source = NULL; /* our list of sources */ |
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int nsources = 0; /* the number of sources */ |
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|
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static CONTRIB *srccnt; /* source contributions in direct() */ |
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static CNTPTR *cntord; /* source ordering in direct() */ |
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|
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marksources() /* find and mark source objects */ |
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{ |
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register OBJREC *o, *m; |
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|
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m = objptr(o->omod); |
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|
53 |
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if (m->otype != MAT_LIGHT && |
47 |
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m->otype != MAT_ILLUM && |
48 |
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m->otype != MAT_GLOW && |
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m->otype != MAT_SPOT) |
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if (!islight(m->otype)) |
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continue; |
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|
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if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 : |
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m->oargs.farg[3] <= FTINY) |
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continue; /* don't bother */ |
64 |
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|
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if (nsources >= MAXSOURCE) |
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error(INTERNAL, "too many sources in marksources"); |
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if (source == NULL) |
66 |
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source = (SRCREC *)malloc(sizeof(SRCREC)); |
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else |
68 |
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source = (SRCREC *)realloc((char *)source, |
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(unsigned)(nsources+1)*sizeof(SRCREC)); |
70 |
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if (source == NULL) |
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goto memerr; |
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|
73 |
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newsource(&srcval[nsources], o); |
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newsource(&source[nsources], o); |
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|
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if (m->otype == MAT_GLOW) { |
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srcval[nsources].sflags |= SPROX; |
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srcval[nsources].sl.prox = m->oargs.farg[3]; |
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source[nsources].sflags |= SPROX; |
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source[nsources].sl.prox = m->oargs.farg[3]; |
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if (o->otype == OBJ_SOURCE) |
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srcval[nsources].sflags |= SSKIP; |
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source[nsources].sflags |= SSKIP; |
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} else if (m->otype == MAT_SPOT) { |
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srcval[nsources].sflags |= SSPOT; |
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srcval[nsources].sl.s = makespot(m); |
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source[nsources].sflags |= SSPOT; |
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source[nsources].sl.s = makespot(m); |
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} |
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nsources++; |
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} |
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if (nsources <= 0) { |
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error(WARNING, "no light sources found"); |
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return; |
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} |
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srccnt = (CONTRIB *)malloc(nsources*sizeof(CONTRIB)); |
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cntord = (CNTPTR *)malloc(nsources*sizeof(CNTPTR)); |
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if (srccnt != NULL && cntord != NULL) |
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return; |
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/* fall through */ |
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memerr: |
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error(SYSTEM, "out of memory in marksources"); |
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} |
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|
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|
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newsource(src, so) /* add a source to the array */ |
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register SOURCE *src; |
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register SRCREC *src; |
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register OBJREC *so; |
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{ |
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double cos(), tan(), sqrt(); |
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register int i; |
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|
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src->sflags = 0; |
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src->aimsuccess = 2*AIMREQT-1; /* bitch on second failure */ |
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src->nhits = 1; src->ntests = 2; /* start probability = 1/2 */ |
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src->so = so; |
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|
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switch (so->otype) { |
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double d; |
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register int i; |
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|
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if (srcval[sn].sflags & SSKIP) |
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if (source[sn].sflags & SSKIP) |
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return(0.0); /* skip this source */ |
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|
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rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
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|
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sr->rsrc = sn; /* remember source */ |
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/* get source direction */ |
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if (srcval[sn].sflags & SDISTANT) |
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if (source[sn].sflags & SDISTANT) |
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/* constant direction */ |
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VCOPY(sr->rdir, srcval[sn].sloc); |
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VCOPY(sr->rdir, source[sn].sloc); |
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else { /* compute direction */ |
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for (i = 0; i < 3; i++) |
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sr->rdir[i] = srcval[sn].sloc[i] - sr->rorg[i]; |
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sr->rdir[i] = source[sn].sloc[i] - sr->rorg[i]; |
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|
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if (srcval[sn].so->otype == OBJ_FACE) |
209 |
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norm = getface(srcval[sn].so)->norm; |
210 |
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else if (srcval[sn].so->otype == OBJ_RING) |
211 |
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norm = getcone(srcval[sn].so,0)->ad; |
208 |
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if (source[sn].so->otype == OBJ_FACE) |
209 |
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norm = getface(source[sn].so)->norm; |
210 |
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else if (source[sn].so->otype == OBJ_RING) |
211 |
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norm = getcone(source[sn].so,0)->ad; |
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|
213 |
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if (norm != NULL && (ddot = -DOT(sr->rdir, norm)) <= 0.0) |
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if (norm != NULL && (ddot = -DOT(sr->rdir, norm)) <= FTINY) |
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return(0.0); /* behind surface! */ |
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} |
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if (dstrsrc > FTINY) { |
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/* distribute source direction */ |
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for (i = 0; i < 3; i++) |
219 |
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vd[i] = dstrsrc * srcval[sn].ss * (1.0 - 2.0*frandom()); |
220 |
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|
218 |
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dimlist[ndims++] = sn; |
219 |
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for (i = 0; i < 3; i++) { |
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dimlist[ndims] = i + 8831; |
221 |
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vd[i] = dstrsrc * source[sn].ss * |
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(1.0 - 2.0*urand(ilhash(dimlist,ndims+1)+samplendx)); |
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} |
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ndims--; |
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if (norm != NULL) { /* project offset */ |
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d = DOT(vd, norm); |
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for (i = 0; i < 3; i++) |
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for (i = 0; i < 3; i++) /* offset source direction */ |
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sr->rdir[i] += vd[i]; |
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} else if (srcval[sn].sflags & SDISTANT) |
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} else if (source[sn].sflags & SDISTANT) |
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/* already normalized */ |
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return(srcval[sn].ss2); |
235 |
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return(source[sn].ss2); |
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|
237 |
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if ((d = normalize(sr->rdir)) == 0.0) |
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/* at source! */ |
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return(0.0); |
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241 |
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if (srcval[sn].sflags & SDISTANT) |
241 |
> |
if (source[sn].sflags & SDISTANT) |
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/* domega constant */ |
243 |
< |
return(srcval[sn].ss2); |
243 |
> |
return(source[sn].ss2); |
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|
219 |
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else { |
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/* check proximity */ |
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if (srcval[sn].sflags & SPROX && |
247 |
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d > srcval[sn].sl.prox) |
248 |
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return(0.0); |
249 |
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|
250 |
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if (norm != NULL) |
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ddot /= d; |
252 |
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else |
253 |
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ddot = 1.0; |
246 |
> |
if (source[sn].sflags & SPROX && |
247 |
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d > source[sn].sl.prox) |
248 |
> |
return(0.0); |
249 |
> |
/* compute dot product */ |
250 |
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if (norm != NULL) |
251 |
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ddot /= d; |
252 |
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else |
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ddot = 1.0; |
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/* check angle */ |
255 |
< |
if (srcval[sn].sflags & SSPOT) { |
256 |
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if (srcval[sn].sl.s->siz < 2.0*PI * |
257 |
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(1.0 + DOT(srcval[sn].sl.s->aim,sr->rdir))) |
258 |
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return(0.0); |
259 |
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d += srcval[sn].sl.s->flen; |
235 |
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} |
236 |
< |
/* return domega */ |
237 |
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return(ddot*srcval[sn].ss2/(d*d)); |
255 |
> |
if (source[sn].sflags & SSPOT) { |
256 |
> |
if (source[sn].sl.s->siz < 2.0*PI * |
257 |
> |
(1.0 + DOT(source[sn].sl.s->aim,sr->rdir))) |
258 |
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return(0.0); |
259 |
> |
d += source[sn].sl.s->flen; /* adjust length */ |
260 |
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} |
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/* compute domega */ |
262 |
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return(ddot*source[sn].ss2/(d*d)); |
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} |
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first = 0; last = nsources-1; |
276 |
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} |
277 |
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for (i = first; i <= last; i++) |
278 |
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if (srcval[i].sflags & SDISTANT) |
278 |
> |
if (source[i].sflags & SDISTANT) |
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/* |
280 |
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* Check to see if ray is within |
281 |
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* solid angle of source. |
282 |
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*/ |
283 |
< |
if (2.0*PI * (1.0 - DOT(srcval[i].sloc,r->rdir)) |
284 |
< |
<= srcval[i].ss2) { |
285 |
< |
r->ro = srcval[i].so; |
286 |
< |
if (!(srcval[i].sflags & SSKIP)) |
283 |
> |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
284 |
> |
<= source[i].ss2) { |
285 |
> |
r->ro = source[i].so; |
286 |
> |
if (!(source[i].sflags & SSKIP)) |
287 |
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break; |
288 |
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} |
289 |
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|
291 |
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for (i = 0; i < 3; i++) |
292 |
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r->ron[i] = -r->rdir[i]; |
293 |
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r->rod = 1.0; |
294 |
+ |
r->rox = NULL; |
295 |
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return(1); |
296 |
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} |
297 |
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return(0); |
298 |
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} |
299 |
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300 |
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|
301 |
+ |
static int |
302 |
+ |
cntcmp(sc1, sc2) /* contribution compare (descending) */ |
303 |
+ |
register CNTPTR *sc1, *sc2; |
304 |
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{ |
305 |
+ |
if (sc1->brt > sc2->brt) |
306 |
+ |
return(-1); |
307 |
+ |
if (sc1->brt < sc2->brt) |
308 |
+ |
return(1); |
309 |
+ |
return(0); |
310 |
+ |
} |
311 |
+ |
|
312 |
+ |
|
313 |
+ |
direct(r, f, p) /* add direct component */ |
314 |
+ |
RAY *r; /* ray that hit surface */ |
315 |
+ |
int (*f)(); /* direct component coefficient function */ |
316 |
+ |
char *p; /* data for f */ |
317 |
+ |
{ |
318 |
+ |
extern double pow(); |
319 |
+ |
register int sn; |
320 |
+ |
int nshadcheck, ncnts; |
321 |
+ |
int nhits; |
322 |
+ |
double prob, ourthresh, hwt; |
323 |
+ |
RAY sr; |
324 |
+ |
/* NOTE: srccnt and cntord global so no recursion */ |
325 |
+ |
if (nsources <= 0) |
326 |
+ |
return; /* no sources?! */ |
327 |
+ |
/* compute number to check */ |
328 |
+ |
nshadcheck = pow((double)nsources, shadcert) + .5; |
329 |
+ |
/* modify threshold */ |
330 |
+ |
ourthresh = shadthresh / r->rweight; |
331 |
+ |
/* potential contributions */ |
332 |
+ |
for (sn = 0; sn < nsources; sn++) { |
333 |
+ |
cntord[sn].sno = sn; |
334 |
+ |
cntord[sn].brt = 0.0; |
335 |
+ |
/* get source ray */ |
336 |
+ |
if ((srccnt[sn].dom = srcray(&sr, r, sn)) == 0.0) |
337 |
+ |
continue; |
338 |
+ |
VCOPY(srccnt[sn].dir, sr.rdir); |
339 |
+ |
/* compute coefficient */ |
340 |
+ |
(*f)(srccnt[sn].val, p, srccnt[sn].dir, srccnt[sn].dom); |
341 |
+ |
cntord[sn].brt = bright(srccnt[sn].val); |
342 |
+ |
if (cntord[sn].brt <= 0.0) |
343 |
+ |
continue; |
344 |
+ |
/* compute intersection */ |
345 |
+ |
if (source[sn].sflags & SDISTANT ? |
346 |
+ |
sourcehit(&sr) : |
347 |
+ |
(*ofun[source[sn].so->otype].funp) |
348 |
+ |
(source[sn].so, &sr)) { |
349 |
+ |
if (source[sn].aimsuccess >= 0) |
350 |
+ |
source[sn].aimsuccess++; |
351 |
+ |
} else { |
352 |
+ |
cntord[sn].brt = 0.0; |
353 |
+ |
if (source[sn].aimsuccess < 0) |
354 |
+ |
continue; /* bitched already */ |
355 |
+ |
source[sn].aimsuccess -= AIMREQT; |
356 |
+ |
if (source[sn].aimsuccess >= 0) |
357 |
+ |
continue; /* leniency */ |
358 |
+ |
sprintf(errmsg, |
359 |
+ |
"aiming failure for light source \"%s\"", |
360 |
+ |
source[sn].so->oname); |
361 |
+ |
error(WARNING, errmsg); |
362 |
+ |
continue; |
363 |
+ |
} |
364 |
+ |
/* compute contribution */ |
365 |
+ |
raycont(&sr); |
366 |
+ |
multcolor(srccnt[sn].val, sr.rcol); |
367 |
+ |
cntord[sn].brt = bright(srccnt[sn].val); |
368 |
+ |
} |
369 |
+ |
/* sort contributions */ |
370 |
+ |
qsort(cntord, nsources, sizeof(CNTPTR), cntcmp); |
371 |
+ |
{ /* find last */ |
372 |
+ |
register int l, m; |
373 |
+ |
|
374 |
+ |
sn = 0; ncnts = l = nsources; |
375 |
+ |
while ((m = (sn + ncnts) >> 1) != l) { |
376 |
+ |
if (cntord[m].brt > 0.0) |
377 |
+ |
sn = m; |
378 |
+ |
else |
379 |
+ |
ncnts = m; |
380 |
+ |
l = m; |
381 |
+ |
} |
382 |
+ |
} |
383 |
+ |
/* accumulate tail */ |
384 |
+ |
for (sn = ncnts-1; sn > 0; sn--) |
385 |
+ |
cntord[sn-1].brt += cntord[sn].brt; |
386 |
+ |
/* test for shadows */ |
387 |
+ |
nhits = 0; |
388 |
+ |
for (sn = 0; sn < ncnts; sn++) { |
389 |
+ |
/* check threshold */ |
390 |
+ |
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
391 |
+ |
cntord[sn].brt-cntord[sn+nshadcheck].brt) |
392 |
+ |
< ourthresh*bright(r->rcol)) |
393 |
+ |
break; |
394 |
+ |
/* get statistics */ |
395 |
+ |
source[cntord[sn].sno].ntests++; |
396 |
+ |
/* test for hit */ |
397 |
+ |
rayorigin(&sr, r, SHADOW, 1.0); |
398 |
+ |
VCOPY(sr.rdir, srccnt[cntord[sn].sno].dir); |
399 |
+ |
sr.rsrc = cntord[sn].sno; |
400 |
+ |
if (localhit(&sr, &thescene) && |
401 |
+ |
sr.ro != source[cntord[sn].sno].so) { |
402 |
+ |
/* check for transmission */ |
403 |
+ |
raycont(&sr); |
404 |
+ |
if (bright(sr.rcol) <= FTINY) |
405 |
+ |
continue; /* missed! */ |
406 |
+ |
(*f)(srccnt[cntord[sn].sno].val, p, |
407 |
+ |
srccnt[cntord[sn].sno].dir, |
408 |
+ |
srccnt[cntord[sn].sno].dom); |
409 |
+ |
multcolor(srccnt[cntord[sn].sno].val, sr.rcol); |
410 |
+ |
} |
411 |
+ |
/* add contribution if hit */ |
412 |
+ |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
413 |
+ |
nhits++; |
414 |
+ |
source[cntord[sn].sno].nhits++; |
415 |
+ |
} |
416 |
+ |
/* surface hit rate */ |
417 |
+ |
if (sn > 0) |
418 |
+ |
hwt = (double)nhits / (double)sn; |
419 |
+ |
else |
420 |
+ |
hwt = 0.5; |
421 |
+ |
#ifdef DEBUG |
422 |
+ |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
423 |
+ |
sn, ncnts-sn, hwt); |
424 |
+ |
eputs(errmsg); |
425 |
+ |
#endif |
426 |
+ |
/* add in untested sources */ |
427 |
+ |
for ( ; sn < ncnts; sn++) { |
428 |
+ |
prob = hwt * (double)source[cntord[sn].sno].nhits / |
429 |
+ |
(double)source[cntord[sn].sno].ntests; |
430 |
+ |
scalecolor(srccnt[cntord[sn].sno].val, prob); |
431 |
+ |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
432 |
+ |
} |
433 |
+ |
} |
434 |
+ |
|
435 |
+ |
|
436 |
|
#define wrongsource(m, r) (m->otype!=MAT_ILLUM && \ |
437 |
|
r->rsrc>=0 && \ |
438 |
< |
srcval[r->rsrc].so!=r->ro) |
438 |
> |
source[r->rsrc].so!=r->ro) |
439 |
|
|
440 |
|
#define badambient(m, r) ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \ |
441 |
|
!(r->rtype&REFLECTED) && /* hack! */\ |
442 |
|
!(m->otype==MAT_GLOW&&r->rot>m->oargs.farg[3])) |
443 |
|
|
444 |
|
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
445 |
< |
!(r->rsrc>=0&&srcval[r->rsrc].so==r->ro)) |
445 |
> |
!(r->rsrc>=0&&source[r->rsrc].so==r->ro)) |
446 |
|
|
447 |
|
|
448 |
|
m_light(m, r) /* ray hit a light source */ |
449 |
|
register OBJREC *m; |
450 |
|
register RAY *r; |
451 |
|
{ |
292 |
– |
/* check for behind */ |
293 |
– |
if (r->rod < 0.0) |
294 |
– |
return; |
452 |
|
/* check for over-counting */ |
453 |
|
if (wrongsource(m, r) || badambient(m, r)) |
454 |
|
return; |
462 |
|
|
463 |
|
/* otherwise treat as source */ |
464 |
|
} else { |
465 |
+ |
/* check for behind */ |
466 |
+ |
if (r->rod < 0.0) |
467 |
+ |
return; |
468 |
|
/* get distribution pattern */ |
469 |
|
raytexture(r, m->omod); |
470 |
|
/* get source color */ |
475 |
|
multcolor(r->rcol, r->pcol); |
476 |
|
} |
477 |
|
} |
318 |
– |
|
319 |
– |
|
320 |
– |
o_source() {} /* intersection with a source is done elsewhere */ |