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greg |
1.1 |
/* 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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#endif |
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/* |
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* Routines for simulating virtual light sources |
9 |
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* Thus far, we only support planar mirrors. |
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*/ |
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#include "ray.h" |
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greg |
1.3 |
#include "otypes.h" |
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16 |
greg |
1.1 |
#include "source.h" |
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18 |
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19 |
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double intercircle(); |
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21 |
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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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25 |
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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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register int i; |
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/* check number of direct relays */ |
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if (directrelay <= 0) |
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return; |
32 |
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/* find virtual source objects */ |
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for (i = 0; i < nobjects; i++) { |
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o = objptr(i); |
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greg |
1.3 |
if (!issurface(o->otype) || o->omod == OVOID) |
36 |
greg |
1.1 |
continue; |
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if (!isvlight(objptr(o->omod)->otype)) |
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continue; |
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greg |
1.3 |
if (sfun[o->otype].of == NULL || |
40 |
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sfun[o->otype].of->getpleq == NULL) |
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objerror(o, USER, "illegal material"); |
42 |
greg |
1.1 |
if (nvobjects == 0) |
43 |
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vobject = (OBJECT *)malloc(sizeof(OBJECT)); |
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else |
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vobject = (OBJECT *)realloc((char *)vobject, |
46 |
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(unsigned)(nvobjects+1)*sizeof(OBJECT)); |
47 |
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if (vobject == NULL) |
48 |
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error(SYSTEM, "out of memory in addvirtuals"); |
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vobject[nvobjects++] = i; |
50 |
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} |
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if (nvobjects == 0) |
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return; |
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greg |
1.4 |
#ifdef DEBUG |
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fprintf(stderr, "found %d virtual source objects\n", nvobjects); |
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#endif |
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greg |
1.1 |
/* append virtual sources */ |
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for (i = nsources; i-- > 0; ) |
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if (!(source[i].sflags & SSKIP)) |
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greg |
1.4 |
addvirtuals(i, directrelay); |
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greg |
1.1 |
/* done with our object list */ |
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free((char *)vobject); |
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nvobjects = 0; |
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} |
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greg |
1.4 |
addvirtuals(sn, nr) /* add virtuals associated with source */ |
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int sn; |
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greg |
1.1 |
int nr; |
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{ |
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register int i; |
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/* check relay limit first */ |
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if (nr <= 0) |
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return; |
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/* check each virtual object for projection */ |
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for (i = 0; i < nvobjects; i++) |
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greg |
1.3 |
/* vproject() calls us recursively */ |
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greg |
1.4 |
vproject(objptr(vobject[i]), sn, nr-1); |
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greg |
1.1 |
} |
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greg |
1.4 |
vproject(o, sn, n) /* create projected source(s) if they exist */ |
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greg |
1.3 |
OBJREC *o; |
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greg |
1.4 |
int sn; |
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greg |
1.3 |
int n; |
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{ |
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register int i; |
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register VSMATERIAL *vsmat; |
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MAT4 proj; |
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greg |
1.4 |
int ns; |
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if (o == source[sn].so) /* objects cannot project themselves */ |
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return; |
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greg |
1.3 |
/* get virtual source material */ |
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vsmat = sfun[objptr(o->omod)->otype].mf; |
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/* project virtual sources */ |
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for (i = 0; i < vsmat->nproj; i++) |
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greg |
1.4 |
if ((*vsmat->vproj)(proj, o, &source[sn], i)) |
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if ((ns = makevsrc(o, sn, proj)) >= 0) { |
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#ifdef DEBUG |
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virtverb(&source[sn], stderr); |
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#endif |
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greg |
1.3 |
addvirtuals(ns, n); |
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greg |
1.4 |
} |
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greg |
1.3 |
} |
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greg |
1.4 |
int |
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makevsrc(op, sn, pm) /* make virtual source if reasonable */ |
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greg |
1.1 |
OBJREC *op; |
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greg |
1.4 |
register int sn; |
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greg |
1.1 |
MAT4 pm; |
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{ |
113 |
greg |
1.4 |
register int nsn; |
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greg |
1.1 |
FVECT nsloc, ocent, nsnorm; |
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greg |
1.3 |
int nsflags; |
116 |
greg |
1.1 |
double maxrad2; |
117 |
greg |
1.3 |
double d1; |
118 |
greg |
1.1 |
SPOT theirspot, ourspot; |
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register int i; |
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greg |
1.3 |
|
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greg |
1.4 |
nsflags = (source[sn].sflags|(SVIRTUAL|SFOLLOW)) & ~SSPOT; |
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greg |
1.1 |
/* get object center and max. radius */ |
123 |
greg |
1.3 |
if (sfun[op->otype].of->getdisk != NULL) { |
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maxrad2 = (*sfun[op->otype].of->getdisk)(ocent, op); |
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if (maxrad2 <= FTINY) /* too small? */ |
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return(NULL); |
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nsflags |= SSPOT; |
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} |
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greg |
1.1 |
/* get location and spot */ |
130 |
greg |
1.4 |
if (source[sn].sflags & SDISTANT) { /* distant source */ |
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if (source[sn].sflags & SPROX) |
132 |
greg |
1.1 |
return(NULL); /* should never get here! */ |
133 |
greg |
1.4 |
multv3(nsloc, source[sn].sloc, pm); |
134 |
greg |
1.3 |
if (nsflags & SSPOT) { |
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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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} |
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greg |
1.4 |
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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greg |
1.3 |
if (nsflags & SSPOT && |
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!commonbeam(&ourspot, &theirspot, nsloc)) |
144 |
greg |
1.1 |
return(NULL); /* no overlap */ |
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} |
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} else { /* local source */ |
147 |
greg |
1.4 |
multp3(nsloc, source[sn].sloc, pm); |
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greg |
1.3 |
if (nsflags & SSPOT) { |
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for (i = 0; i < 3; i++) |
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ourspot.aim[i] = ocent[i] - nsloc[i]; |
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if ((d1 = normalize(ourspot.aim)) == 0.) |
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return(NULL); /* at source!! */ |
153 |
greg |
1.4 |
if (source[sn].sflags & SPROX && |
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d1 > source[sn].sl.prox) |
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greg |
1.3 |
return(NULL); /* too far away */ |
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ourspot.siz = 2.*PI*(1. - d1/sqrt(d1*d1+maxrad2)); |
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ourspot.flen = 0.; |
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greg |
1.4 |
} else if (source[sn].sflags & SPROX) { |
159 |
greg |
1.3 |
FVECT norm; |
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double offs; |
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/* use distance from plane */ |
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offs = (*sfun[op->otype].of->getpleq)(norm, op); |
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d1 = DOT(norm, nsloc) - offs; |
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greg |
1.4 |
if (d1 < 0.) d1 = -d1; |
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if (d1 > source[sn].sl.prox) |
166 |
greg |
1.3 |
return(NULL); /* too far away */ |
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} |
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greg |
1.4 |
if (source[sn].sflags & SSPOT) { |
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copystruct(&theirspot, source[sn].sl.s); |
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multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
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greg |
1.3 |
if (nsflags & SSPOT) { |
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if (!commonspot(&ourspot, &theirspot, nsloc)) |
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return(NULL); /* no overlap */ |
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ourspot.flen = theirspot.flen; |
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} |
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greg |
1.1 |
} |
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greg |
1.4 |
if (source[sn].sflags & SFLAT) { /* behind source? */ |
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multv3(nsnorm, source[sn].snorm, pm); |
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greg |
1.3 |
if (nsflags & SSPOT && checkspot(&ourspot, nsnorm) < 0) |
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greg |
1.1 |
return(NULL); |
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} |
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} |
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/* everything is OK, make source */ |
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greg |
1.4 |
if ((nsn = newsource()) < 0) |
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greg |
1.1 |
goto memerr; |
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greg |
1.4 |
source[nsn].sflags = nsflags; |
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VCOPY(source[nsn].sloc, nsloc); |
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greg |
1.3 |
if (nsflags & SFLAT) |
189 |
greg |
1.4 |
VCOPY(source[nsn].snorm, nsnorm); |
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source[nsn].ss = source[sn].ss; source[nsn].ss2 = source[sn].ss2; |
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if ((nsflags | source[sn].sflags) & SSPOT) { |
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if ((source[nsn].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
193 |
greg |
1.3 |
goto memerr; |
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if (nsflags & SSPOT) |
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greg |
1.4 |
copystruct(source[nsn].sl.s, &ourspot); |
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greg |
1.3 |
else |
197 |
greg |
1.4 |
copystruct(source[nsn].sl.s, &theirspot); |
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source[nsn].sflags |= SSPOT; |
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greg |
1.3 |
} |
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if (nsflags & SPROX) |
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greg |
1.4 |
source[nsn].sl.prox = source[sn].sl.prox; |
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source[nsn].sa.svnext = sn; |
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source[nsn].so = op; |
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return(nsn); |
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greg |
1.1 |
memerr: |
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error(SYSTEM, "out of memory in makevsrc"); |
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} |
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commonspot(sp1, sp2, org) /* set sp1 to intersection of sp1 and sp2 */ |
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register SPOT *sp1, *sp2; |
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FVECT org; |
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{ |
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FVECT cent; |
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greg |
1.2 |
double rad2, cos1, cos2; |
216 |
greg |
1.1 |
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217 |
greg |
1.2 |
cos1 = 1. - sp1->siz/(2.*PI); |
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cos2 = 1. - sp2->siz/(2.*PI); |
219 |
greg |
1.1 |
if (sp2->siz >= 2.*PI-FTINY) /* BIG, just check overlap */ |
220 |
greg |
1.2 |
return(DOT(sp1->aim,sp2->aim) >= cos1*cos2 - |
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sqrt((1.-cos1*cos1)*(1.-cos2*cos2))); |
222 |
greg |
1.1 |
/* compute and check disks */ |
223 |
greg |
1.2 |
rad2 = intercircle(cent, sp1->aim, sp2->aim, |
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1./(cos1*cos1) - 1., 1./(cos2*cos2) - 1.); |
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greg |
1.1 |
if (rad2 <= FTINY || normalize(cent) == 0.) |
226 |
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return(0); |
227 |
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VCOPY(sp1->aim, cent); |
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sp1->siz = 2.*PI*(1. - 1./sqrt(1.+rad2)); |
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return(1); |
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} |
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commonbeam(sp1, sp2, dir) /* set sp1 to intersection of sp1 and sp2 */ |
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register SPOT *sp1, *sp2; |
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FVECT dir; |
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{ |
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FVECT cent, c1, c2; |
238 |
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double rad2, d; |
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register int i; |
240 |
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/* move centers to common plane */ |
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d = DOT(sp1->aim, dir); |
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for (i = 0; i < 3; i++) |
243 |
greg |
1.2 |
c1[i] = sp1->aim[i] - d*dir[i]; |
244 |
greg |
1.1 |
d = DOT(sp2->aim, dir); |
245 |
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for (i = 0; i < 3; i++) |
246 |
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c2[i] = sp2->aim[i] - d*dir[i]; |
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/* compute overlap */ |
248 |
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rad2 = intercircle(cent, c1, c2, sp1->siz/PI, sp2->siz/PI); |
249 |
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if (rad2 <= FTINY) |
250 |
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return(0); |
251 |
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VCOPY(sp1->aim, cent); |
252 |
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sp1->siz = PI*rad2; |
253 |
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return(1); |
254 |
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} |
255 |
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256 |
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257 |
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checkspot(sp, nrm) /* check spotlight for behind source */ |
258 |
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register SPOT *sp; |
259 |
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FVECT nrm; |
260 |
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{ |
261 |
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double d, d1; |
262 |
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263 |
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d = DOT(sp->aim, nrm); |
264 |
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if (d > FTINY) /* center in front? */ |
265 |
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return(0); |
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/* else check horizon */ |
267 |
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d1 = 1. - sp->siz/(2.*PI); |
268 |
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return(1.-FTINY-d*d > d1*d1); |
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} |
270 |
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271 |
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272 |
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double |
273 |
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intercircle(cc, c1, c2, r1s, r2s) /* intersect two circles */ |
274 |
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FVECT cc; /* midpoint (return value) */ |
275 |
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FVECT c1, c2; /* circle centers */ |
276 |
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double r1s, r2s; /* radii squared */ |
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{ |
278 |
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double a2, d2, l; |
279 |
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FVECT disp; |
280 |
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register int i; |
281 |
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282 |
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for (i = 0; i < 3; i++) |
283 |
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disp[i] = c2[i] - c1[i]; |
284 |
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d2 = DOT(disp,disp); |
285 |
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/* circle within overlap? */ |
286 |
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if (r1s < r2s) { |
287 |
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if (r2s >= r1s + d2) { |
288 |
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VCOPY(cc, c1); |
289 |
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return(r1s); |
290 |
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} |
291 |
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} else { |
292 |
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if (r1s >= r2s + d2) { |
293 |
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VCOPY(cc, c2); |
294 |
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return(r2s); |
295 |
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} |
296 |
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} |
297 |
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a2 = .25*(2.*(r1s+r2s) - d2 - (r2s-r1s)*(r2s-r1s)/d2); |
298 |
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/* no overlap? */ |
299 |
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if (a2 <= 0.) |
300 |
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return(0.); |
301 |
greg |
1.2 |
/* overlap, compute center */ |
302 |
greg |
1.1 |
l = sqrt((r1s - a2)/d2); |
303 |
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for (i = 0; i < 3; i++) |
304 |
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cc[i] = c1[i] + l*disp[i]; |
305 |
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return(a2); |
306 |
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} |
307 |
greg |
1.4 |
|
308 |
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309 |
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#ifdef DEBUG |
310 |
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virtverb(vs, fp) /* print verbose description of virtual source */ |
311 |
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register SRCREC *vs; |
312 |
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FILE *fp; |
313 |
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{ |
314 |
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register int i; |
315 |
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316 |
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fprintf(fp, "%s virtual source %d in %s %s\n", |
317 |
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vs->sflags & SDISTANT ? "distant" : "local", |
318 |
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vs-source, ofun[vs->so->otype].funame, vs->so->oname); |
319 |
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fprintf(fp, "\tat (%f,%f,%f)\n", |
320 |
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vs->sloc[0], vs->sloc[1], vs->sloc[2]); |
321 |
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fprintf(fp, "\tlinked to source %d (%s)\n", |
322 |
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vs->sa.svnext, source[vs->sa.svnext].so->oname); |
323 |
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if (vs->sflags & SFOLLOW) |
324 |
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fprintf(fp, "\talways followed\n"); |
325 |
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else |
326 |
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fprintf(fp, "\tnever followed\n"); |
327 |
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if (!(vs->sflags & SSPOT)) |
328 |
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return; |
329 |
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fprintf(fp, "\twith spot aim (%f,%f,%f) and size %f\n", |
330 |
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vs->sl.s->aim[0], vs->sl.s->aim[1], vs->sl.s->aim[2], |
331 |
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vs->sl.s->siz); |
332 |
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} |
333 |
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#endif |