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/* Copyright (c) 1991 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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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* Routines for simulating virtual light sources |
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* Thus far, we only support planar mirrors. |
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* |
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* External symbols declared in source.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include "ray.h" |
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|
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#include "octree.h" |
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|
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#include "otypes.h" |
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|
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#include "source.h" |
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|
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#include "random.h" |
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|
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#define MINSAMPLES 16 /* minimum number of pretest samples */ |
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#define STESTMAX 32 /* maximum seeks per sample */ |
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|
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double getdisk(); |
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|
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static OBJECT *vobject; /* virtual source objects */ |
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static int nvobjects = 0; /* number of virtual source objects */ |
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|
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void |
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markvirtuals() /* find and mark virtual sources */ |
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{ |
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register OBJREC *o; |
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if (directrelay <= 0) |
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return; |
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/* find virtual source objects */ |
38 |
< |
for (i = 0; i < nobjects; i++) { |
38 |
> |
for (i = 0; i < nsceneobjs; i++) { |
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o = objptr(i); |
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if (!issurface(o->otype) || o->omod == OVOID) |
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continue; |
42 |
< |
if (!isvlight(objptr(o->omod)->otype)) |
42 |
> |
if (!isvlight(vsmaterial(o)->otype)) |
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continue; |
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if (sfun[o->otype].of == NULL || |
45 |
< |
sfun[o->otype].of->getpleq == NULL) |
46 |
< |
objerror(o, USER, "illegal material"); |
45 |
> |
sfun[o->otype].of->getpleq == NULL) { |
46 |
> |
objerror(o,WARNING,"secondary sources not supported"); |
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> |
continue; |
48 |
> |
} |
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if (nvobjects == 0) |
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vobject = (OBJECT *)malloc(sizeof(OBJECT)); |
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else |
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< |
vobject = (OBJECT *)realloc((char *)vobject, |
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> |
vobject = (OBJECT *)realloc((void *)vobject, |
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(unsigned)(nvobjects+1)*sizeof(OBJECT)); |
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if (vobject == NULL) |
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error(SYSTEM, "out of memory in addvirtuals"); |
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for (i = nsources; i-- > 0; ) |
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addvirtuals(i, directrelay); |
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/* done with our object list */ |
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free((char *)vobject); |
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> |
free((void *)vobject); |
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nvobjects = 0; |
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} |
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|
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|
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void |
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addvirtuals(sn, nr) /* add virtuals associated with source */ |
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int sn; |
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int nr; |
87 |
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} |
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|
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|
90 |
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void |
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vproject(o, sn, n) /* create projected source(s) if they exist */ |
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OBJREC *o; |
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int sn; |
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if (o == source[sn].so) /* objects cannot project themselves */ |
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return; |
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/* get virtual source material */ |
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< |
vsmat = sfun[objptr(o->omod)->otype].mf; |
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> |
vsmat = sfun[vsmaterial(o)->otype].mf; |
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/* project virtual sources */ |
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for (i = 0; i < vsmat->nproj; i++) |
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if ((*vsmat->vproj)(proj, o, &source[sn], i)) |
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if ((ns = makevsrc(o, sn, proj)) >= 0) { |
109 |
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source[ns].sa.sv.pn = i; |
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#ifdef DEBUG |
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virtverb(ns, stderr); |
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#endif |
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} |
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|
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|
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OBJREC * |
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vsmaterial(o) /* get virtual source material pointer */ |
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OBJREC *o; |
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{ |
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register int i; |
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register OBJREC *m; |
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|
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i = o->omod; |
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m = findmaterial(objptr(i)); |
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if (m == NULL) |
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return(objptr(i)); |
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if (m->otype != MAT_ILLUM || m->oargs.nsargs < 1 || |
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!strcmp(m->oargs.sarg[0], VOIDID) || |
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(i = lastmod(objndx(m), m->oargs.sarg[0])) == OVOID) |
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return(m); /* direct modifier */ |
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return(objptr(i)); /* illum alternate */ |
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} |
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|
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|
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int |
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makevsrc(op, sn, pm) /* make virtual source if reasonable */ |
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OBJREC *op; |
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if (source[sn].sflags & SPROX) |
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return(-1); /* should never get here! */ |
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multv3(nsloc, source[sn].sloc, pm); |
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normalize(nsloc); |
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VCOPY(ourspot.aim, ocent); |
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ourspot.siz = PI*maxrad2; |
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ourspot.flen = 0.; |
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ourspot.flen = -1.; |
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if (source[sn].sflags & SSPOT) { |
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copystruct(&theirspot, source[sn].sl.s); |
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multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
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/* adjust for source size */ |
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d = sqrt(dist2(ourspot.aim, theirspot.aim)); |
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d = sqrt(source[sn].sl.s->siz/PI) + d*source[sn].srad; |
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theirspot.siz = PI*d*d; |
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ourspot.flen = theirspot.flen = source[sn].sl.s->flen; |
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d = ourspot.siz; |
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if (!commonbeam(&ourspot, &theirspot, nsloc)) |
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return(-1); /* no overlap */ |
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return(-1); /* at source!! */ |
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if (source[sn].sflags & SPROX && d > source[sn].sl.prox) |
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return(-1); /* too far away */ |
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ourspot.siz = 2.*PI*(1. - d/sqrt(d*d+maxrad2)); |
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ourspot.flen = 0.; |
192 |
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/* adjust for source size */ |
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d = (sqrt(maxrad2) + source[sn].srad) / d; |
194 |
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if (d < 1.-FTINY) |
195 |
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ourspot.siz = 2.*PI*(1. - sqrt(1.-d*d)); |
196 |
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else |
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nsflags &= ~SSPOT; |
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if (source[sn].sflags & SSPOT) { |
199 |
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copystruct(&theirspot, source[sn].sl.s); |
199 |
> |
theirspot = *(source[sn].sl.s); |
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multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
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< |
d = ourspot.siz; |
202 |
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if (!commonspot(&ourspot, &theirspot, nsloc)) |
203 |
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return(-1); /* no overlap */ |
201 |
> |
normalize(theirspot.aim); |
202 |
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if (nsflags & SSPOT) { |
203 |
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ourspot.flen = theirspot.flen; |
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d = ourspot.siz; |
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if (!commonspot(&ourspot, &theirspot, nsloc)) |
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return(-1); /* no overlap */ |
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} else { |
208 |
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nsflags |= SSPOT; |
209 |
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ourspot = theirspot; |
210 |
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d = 2.*ourspot.siz; |
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} |
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if (ourspot.siz < d-FTINY) { /* it shrunk */ |
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d = spotdisk(v, op, &ourspot, nsloc); |
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if (d <= FTINY) |
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VCOPY(ocent, v); |
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} |
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} |
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ourspot.flen = theirspot.flen; |
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} |
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if (source[sn].sflags & SFLAT) { /* behind source? */ |
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multv3(nsnorm, source[sn].snorm, pm); |
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if (checkspot(&ourspot, nsnorm) < 0) |
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normalize(nsnorm); |
225 |
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if (nsflags & SSPOT && !checkspot(&ourspot, nsnorm)) |
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return(-1); |
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} |
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} |
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goto memerr; |
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source[i].sflags = nsflags; |
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VCOPY(source[i].sloc, nsloc); |
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multv3(source[i].ss[SU], source[sn].ss[SU], pm); |
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multv3(source[i].ss[SV], source[sn].ss[SV], pm); |
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if (nsflags & SFLAT) |
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VCOPY(source[i].snorm, nsnorm); |
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< |
source[i].ss = source[sn].ss; source[i].ss2 = source[sn].ss2; |
243 |
< |
if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
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goto memerr; |
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< |
copystruct(source[i].sl.s, &ourspot); |
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> |
else |
243 |
> |
multv3(source[i].ss[SW], source[sn].ss[SW], pm); |
244 |
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source[i].srad = source[sn].srad; |
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source[i].ss2 = source[sn].ss2; |
246 |
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if (nsflags & SSPOT) { |
247 |
> |
if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
248 |
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goto memerr; |
249 |
> |
*(source[i].sl.s) = ourspot; |
250 |
> |
} |
251 |
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if (nsflags & SPROX) |
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source[i].sl.prox = source[sn].sl.prox; |
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< |
source[i].sa.svnext = sn; |
253 |
> |
source[i].sa.sv.sn = sn; |
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source[i].so = op; |
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return(i); |
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memerr: |
301 |
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RAY sr; |
302 |
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FVECT onorm; |
303 |
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FVECT offsdir; |
304 |
+ |
SRCINDEX si; |
305 |
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double or, d; |
306 |
< |
int infront; |
256 |
< |
int ssn; |
306 |
> |
int stestlim, ssn; |
307 |
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int nhit, nok; |
308 |
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register int i, n; |
309 |
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/* return if pretesting disabled */ |
313 |
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getplaneq(onorm, o); |
314 |
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/* set number of rays to sample */ |
315 |
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if (source[sn].sflags & SDISTANT) { |
316 |
< |
n = (2./3.*PI*PI)*or2/(thescene.cusize*thescene.cusize)* |
317 |
< |
vspretest + .5; |
268 |
< |
infront = DOT(onorm, source[sn].sloc) > 0.; |
316 |
> |
/* 32. == heuristic constant */ |
317 |
> |
n = 32.*or2/(thescene.cusize*thescene.cusize)*vspretest + .5; |
318 |
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} else { |
319 |
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for (i = 0; i < 3; i++) |
320 |
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offsdir[i] = source[sn].sloc[i] - oc[i]; |
321 |
< |
n = or2/DOT(offsdir,offsdir)*vspretest + .5; |
322 |
< |
infront = DOT(onorm, offsdir) > 0.; |
321 |
> |
d = DOT(offsdir,offsdir); |
322 |
> |
if (d <= FTINY) |
323 |
> |
n = 2.*PI * vspretest + .5; |
324 |
> |
else |
325 |
> |
n = 2.*PI * (1.-sqrt(1./(1.+or2/d)))*vspretest + .5; |
326 |
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} |
327 |
< |
if (n < 1) n = 1; |
327 |
> |
if (n < MINSAMPLES) n = MINSAMPLES; |
328 |
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#ifdef DEBUG |
329 |
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fprintf(stderr, "pretesting source %d in object %s with %d rays\n", |
330 |
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sn, o->oname, n); |
331 |
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#endif |
332 |
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/* sample */ |
333 |
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or = sqrt(or2); |
334 |
< |
ssn = 25*n; |
334 |
> |
stestlim = n*STESTMAX; |
335 |
> |
ssn = 0; |
336 |
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nhit = nok = 0; |
337 |
+ |
initsrcindex(&si); |
338 |
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while (n-- > 0) { |
339 |
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/* get sample point */ |
340 |
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do { |
341 |
< |
if (--ssn < 0) { |
341 |
> |
if (ssn >= stestlim) { |
342 |
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#ifdef DEBUG |
343 |
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fprintf(stderr, "\ttoo hard to hit\n"); |
344 |
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#endif |
345 |
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return(f); /* too small a target! */ |
346 |
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} |
347 |
+ |
multisamp(offsdir, 3, urand(sn*931+5827+ssn)); |
348 |
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for (i = 0; i < 3; i++) |
349 |
< |
offsdir[i] = or*(1. - |
350 |
< |
2.*urand(931*i+5827+ssn)); |
351 |
< |
for (i = 0; i < 3; i++) |
352 |
< |
sr.rorg[i] = oc[i] + offsdir[i]; |
353 |
< |
d = DOT(offsdir,onorm); |
354 |
< |
if (infront) |
355 |
< |
for (i = 0; i < 3; i++) { |
356 |
< |
sr.rorg[i] -= (d-.0001)*onorm[i]; |
302 |
< |
sr.rdir[i] = -onorm[i]; |
303 |
< |
} |
304 |
< |
else |
305 |
< |
for (i = 0; i < 3; i++) { |
306 |
< |
sr.rorg[i] -= (d+.0001)*onorm[i]; |
307 |
< |
sr.rdir[i] = onorm[i]; |
308 |
< |
} |
349 |
> |
offsdir[i] = or*(1. - 2.*offsdir[i]); |
350 |
> |
ssn++; |
351 |
> |
d = 1. - DOT(offsdir, onorm); |
352 |
> |
for (i = 0; i < 3; i++) { |
353 |
> |
sr.rorg[i] = oc[i] + offsdir[i] + d*onorm[i]; |
354 |
> |
sr.rdir[i] = -onorm[i]; |
355 |
> |
} |
356 |
> |
sr.rmax = 0.0; |
357 |
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rayorigin(&sr, NULL, PRIMARY, 1.0); |
358 |
|
} while (!(*ofun[o->otype].funp)(o, &sr)); |
359 |
|
/* check against source */ |
360 |
+ |
VCOPY(sr.rorg, sr.rop); /* starting from intersection */ |
361 |
|
samplendx++; |
362 |
< |
if (srcray(&sr, NULL, sn) == 0.) |
363 |
< |
continue; |
362 |
> |
if (si.sp >= si.np-1 || |
363 |
> |
!srcray(&sr, NULL, &si) || sr.rsrc != sn) { |
364 |
> |
si.sn = sn-1; /* reset index to our source */ |
365 |
> |
si.np = 0; |
366 |
> |
if (!srcray(&sr, NULL, &si) || sr.rsrc != sn) |
367 |
> |
continue; /* can't get there from here */ |
368 |
> |
} |
369 |
|
sr.revf = srcvalue; |
370 |
< |
rayvalue(&sr); |
370 |
> |
rayvalue(&sr); /* check sample validity */ |
371 |
|
if (bright(sr.rcol) <= FTINY) |
372 |
|
continue; |
373 |
< |
nok++; |
374 |
< |
/* check against obstructions */ |
375 |
< |
srcray(&sr, NULL, sn); |
373 |
> |
nok++; /* got sample; check obstructions */ |
374 |
> |
rayclear(&sr); |
375 |
> |
sr.revf = raytrace; |
376 |
|
rayvalue(&sr); |
377 |
|
if (bright(sr.rcol) > FTINY) |
378 |
|
nhit++; |
397 |
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|
398 |
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|
399 |
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#ifdef DEBUG |
400 |
+ |
void |
401 |
|
virtverb(sn, fp) /* print verbose description of virtual source */ |
402 |
|
register int sn; |
403 |
|
FILE *fp; |
411 |
|
fprintf(fp, "\tat (%f,%f,%f)\n", |
412 |
|
source[sn].sloc[0], source[sn].sloc[1], source[sn].sloc[2]); |
413 |
|
fprintf(fp, "\tlinked to source %d (%s)\n", |
414 |
< |
source[sn].sa.svnext, source[source[sn].sa.svnext].so->oname); |
414 |
> |
source[sn].sa.sv.sn, source[source[sn].sa.sv.sn].so->oname); |
415 |
|
if (source[sn].sflags & SFOLLOW) |
416 |
|
fprintf(fp, "\talways followed\n"); |
417 |
|
else |