1 |
greg |
1.1 |
/* Copyright (c) 1991 Regents of the University of California */ |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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7 |
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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. |
10 |
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*/ |
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12 |
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#include "ray.h" |
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14 |
greg |
1.3 |
#include "otypes.h" |
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16 |
greg |
1.1 |
#include "source.h" |
17 |
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18 |
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19 |
greg |
1.6 |
double intercircle(), getdisk(); |
20 |
greg |
1.1 |
|
21 |
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static OBJECT *vobject; /* virtual source objects */ |
22 |
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static int nvobjects = 0; /* number of virtual source objects */ |
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24 |
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25 |
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markvirtuals() /* find and mark virtual sources */ |
26 |
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{ |
27 |
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register OBJREC *o; |
28 |
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register int i; |
29 |
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/* check number of direct relays */ |
30 |
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if (directrelay <= 0) |
31 |
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return; |
32 |
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/* find virtual source objects */ |
33 |
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for (i = 0; i < nobjects; i++) { |
34 |
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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; |
37 |
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if (!isvlight(objptr(o->omod)->otype)) |
38 |
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continue; |
39 |
greg |
1.3 |
if (sfun[o->otype].of == NULL || |
40 |
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sfun[o->otype].of->getpleq == NULL) |
41 |
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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)); |
44 |
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else |
45 |
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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"); |
49 |
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vobject[nvobjects++] = i; |
50 |
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} |
51 |
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if (nvobjects == 0) |
52 |
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return; |
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greg |
1.4 |
#ifdef DEBUG |
54 |
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fprintf(stderr, "found %d virtual source objects\n", nvobjects); |
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#endif |
56 |
greg |
1.1 |
/* append virtual sources */ |
57 |
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for (i = nsources; i-- > 0; ) |
58 |
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if (!(source[i].sflags & SSKIP)) |
59 |
greg |
1.4 |
addvirtuals(i, directrelay); |
60 |
greg |
1.1 |
/* done with our object list */ |
61 |
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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 */ |
77 |
greg |
1.4 |
vproject(objptr(vobject[i]), sn, nr-1); |
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greg |
1.1 |
} |
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80 |
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81 |
greg |
1.4 |
vproject(o, sn, n) /* create projected source(s) if they exist */ |
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greg |
1.3 |
OBJREC *o; |
83 |
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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greg |
1.6 |
virtverb(ns, stderr); |
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greg |
1.4 |
#endif |
102 |
greg |
1.3 |
addvirtuals(ns, n); |
103 |
greg |
1.4 |
} |
104 |
greg |
1.3 |
} |
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106 |
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107 |
greg |
1.4 |
int |
108 |
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makevsrc(op, sn, pm) /* make virtual source if reasonable */ |
109 |
greg |
1.1 |
OBJREC *op; |
110 |
greg |
1.4 |
register int sn; |
111 |
greg |
1.1 |
MAT4 pm; |
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{ |
113 |
greg |
1.6 |
FVECT nsloc, nsnorm, ocent; |
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double maxrad2; |
115 |
greg |
1.3 |
int nsflags; |
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double d1; |
117 |
greg |
1.1 |
SPOT theirspot, ourspot; |
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register int i; |
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greg |
1.3 |
|
120 |
greg |
1.6 |
nsflags = source[sn].sflags | (SVIRTUAL|SSPOT|SFOLLOW); |
121 |
greg |
1.1 |
/* get object center and max. radius */ |
122 |
greg |
1.6 |
maxrad2 = getdisk(ocent, op, sn); |
123 |
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if (maxrad2 <= FTINY) /* too small? */ |
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return(-1); |
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greg |
1.1 |
/* get location and spot */ |
126 |
greg |
1.4 |
if (source[sn].sflags & SDISTANT) { /* distant source */ |
127 |
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if (source[sn].sflags & SPROX) |
128 |
greg |
1.5 |
return(-1); /* should never get here! */ |
129 |
greg |
1.4 |
multv3(nsloc, source[sn].sloc, pm); |
130 |
greg |
1.6 |
VCOPY(ourspot.aim, ocent); |
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ourspot.siz = PI*maxrad2; |
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ourspot.flen = 0.; |
133 |
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); |
136 |
greg |
1.6 |
if (!commonbeam(&ourspot, &theirspot, nsloc)) |
137 |
greg |
1.5 |
return(-1); /* no overlap */ |
138 |
greg |
1.1 |
} |
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} else { /* local source */ |
140 |
greg |
1.4 |
multp3(nsloc, source[sn].sloc, pm); |
141 |
greg |
1.6 |
for (i = 0; i < 3; i++) |
142 |
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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(-1); /* at source!! */ |
145 |
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if (source[sn].sflags & SPROX && d1 > source[sn].sl.prox) |
146 |
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return(-1); /* too far away */ |
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ourspot.siz = 2.*PI*(1. - d1/sqrt(d1*d1+maxrad2)); |
148 |
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ourspot.flen = 0.; |
149 |
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 |
1.6 |
if (!commonspot(&ourspot, &theirspot, nsloc)) |
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return(-1); /* no overlap */ |
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ourspot.flen = theirspot.flen; |
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greg |
1.1 |
} |
156 |
greg |
1.4 |
if (source[sn].sflags & SFLAT) { /* behind source? */ |
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multv3(nsnorm, source[sn].snorm, pm); |
158 |
greg |
1.6 |
if (checkspot(&ourspot, nsnorm) < 0) |
159 |
greg |
1.5 |
return(-1); |
160 |
greg |
1.1 |
} |
161 |
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} |
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/* everything is OK, make source */ |
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greg |
1.6 |
if ((i = newsource()) < 0) |
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greg |
1.1 |
goto memerr; |
165 |
greg |
1.6 |
source[i].sflags = nsflags; |
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VCOPY(source[i].sloc, nsloc); |
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greg |
1.3 |
if (nsflags & SFLAT) |
168 |
greg |
1.6 |
VCOPY(source[i].snorm, nsnorm); |
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source[i].ss = source[sn].ss; source[i].ss2 = source[sn].ss2; |
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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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greg |
1.3 |
if (nsflags & SPROX) |
174 |
greg |
1.6 |
source[i].sl.prox = source[sn].sl.prox; |
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source[i].sa.svnext = sn; |
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source[i].so = op; |
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return(i); |
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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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182 |
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183 |
greg |
1.6 |
double |
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getdisk(oc, op, sn) /* get visible object disk */ |
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FVECT oc; |
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OBJREC *op; |
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register int sn; |
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{ |
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double rad2, roffs, offs, d, rd, rdoto; |
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FVECT rnrm, nrm; |
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/* first, use object getdisk function */ |
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rad2 = (*sfun[op->otype].of->getdisk)(oc, op); |
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if (!(source[sn].sflags & SVIRTUAL)) |
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return(rad2); /* all done for normal source */ |
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/* check for correct side of relay surface */ |
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roffs = (*sfun[source[sn].so->otype].of->getpleq)(rnrm, source[sn].so); |
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rd = DOT(rnrm, source[sn].sloc); /* source projection */ |
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if (!(source[sn].sflags & SDISTANT)) |
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rd -= roffs; |
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d = DOT(rnrm, oc) - roffs; /* disk distance to relay plane */ |
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if ((d > 0.) ^ (rd > 0.)) |
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return(rad2); /* OK if opposite sides */ |
203 |
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if (d*d >= rad2) |
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return(.0); /* no relay is possible */ |
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/* we need a closer look */ |
206 |
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offs = (*sfun[op->otype].of->getpleq)(nrm, op); |
207 |
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rdoto = DOT(rnrm, nrm); |
208 |
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if (d*d >= rad2*(1.-rdoto*rdoto)) |
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return(0.); /* disk entirely on projection side */ |
210 |
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/* should shrink disk but I'm lazy */ |
211 |
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return(rad2); |
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} |
213 |
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214 |
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215 |
greg |
1.1 |
commonspot(sp1, sp2, org) /* set sp1 to intersection of sp1 and sp2 */ |
216 |
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register SPOT *sp1, *sp2; |
217 |
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FVECT org; |
218 |
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{ |
219 |
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FVECT cent; |
220 |
greg |
1.2 |
double rad2, cos1, cos2; |
221 |
greg |
1.1 |
|
222 |
greg |
1.2 |
cos1 = 1. - sp1->siz/(2.*PI); |
223 |
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cos2 = 1. - sp2->siz/(2.*PI); |
224 |
greg |
1.1 |
if (sp2->siz >= 2.*PI-FTINY) /* BIG, just check overlap */ |
225 |
greg |
1.2 |
return(DOT(sp1->aim,sp2->aim) >= cos1*cos2 - |
226 |
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sqrt((1.-cos1*cos1)*(1.-cos2*cos2))); |
227 |
greg |
1.1 |
/* compute and check disks */ |
228 |
greg |
1.2 |
rad2 = intercircle(cent, sp1->aim, sp2->aim, |
229 |
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1./(cos1*cos1) - 1., 1./(cos2*cos2) - 1.); |
230 |
greg |
1.1 |
if (rad2 <= FTINY || normalize(cent) == 0.) |
231 |
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return(0); |
232 |
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VCOPY(sp1->aim, cent); |
233 |
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sp1->siz = 2.*PI*(1. - 1./sqrt(1.+rad2)); |
234 |
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return(1); |
235 |
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} |
236 |
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237 |
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238 |
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commonbeam(sp1, sp2, dir) /* set sp1 to intersection of sp1 and sp2 */ |
239 |
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register SPOT *sp1, *sp2; |
240 |
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FVECT dir; |
241 |
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{ |
242 |
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FVECT cent, c1, c2; |
243 |
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double rad2, d; |
244 |
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register int i; |
245 |
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/* move centers to common plane */ |
246 |
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d = DOT(sp1->aim, dir); |
247 |
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for (i = 0; i < 3; i++) |
248 |
greg |
1.2 |
c1[i] = sp1->aim[i] - d*dir[i]; |
249 |
greg |
1.1 |
d = DOT(sp2->aim, dir); |
250 |
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for (i = 0; i < 3; i++) |
251 |
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c2[i] = sp2->aim[i] - d*dir[i]; |
252 |
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/* compute overlap */ |
253 |
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rad2 = intercircle(cent, c1, c2, sp1->siz/PI, sp2->siz/PI); |
254 |
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if (rad2 <= FTINY) |
255 |
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return(0); |
256 |
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VCOPY(sp1->aim, cent); |
257 |
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sp1->siz = PI*rad2; |
258 |
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return(1); |
259 |
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} |
260 |
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261 |
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262 |
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checkspot(sp, nrm) /* check spotlight for behind source */ |
263 |
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register SPOT *sp; |
264 |
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FVECT nrm; |
265 |
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{ |
266 |
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double d, d1; |
267 |
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268 |
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d = DOT(sp->aim, nrm); |
269 |
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if (d > FTINY) /* center in front? */ |
270 |
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return(0); |
271 |
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/* else check horizon */ |
272 |
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d1 = 1. - sp->siz/(2.*PI); |
273 |
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return(1.-FTINY-d*d > d1*d1); |
274 |
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} |
275 |
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276 |
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277 |
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double |
278 |
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intercircle(cc, c1, c2, r1s, r2s) /* intersect two circles */ |
279 |
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FVECT cc; /* midpoint (return value) */ |
280 |
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FVECT c1, c2; /* circle centers */ |
281 |
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double r1s, r2s; /* radii squared */ |
282 |
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{ |
283 |
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double a2, d2, l; |
284 |
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FVECT disp; |
285 |
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register int i; |
286 |
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287 |
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for (i = 0; i < 3; i++) |
288 |
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disp[i] = c2[i] - c1[i]; |
289 |
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d2 = DOT(disp,disp); |
290 |
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/* circle within overlap? */ |
291 |
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if (r1s < r2s) { |
292 |
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if (r2s >= r1s + d2) { |
293 |
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VCOPY(cc, c1); |
294 |
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return(r1s); |
295 |
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} |
296 |
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} else { |
297 |
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if (r1s >= r2s + d2) { |
298 |
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VCOPY(cc, c2); |
299 |
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return(r2s); |
300 |
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} |
301 |
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} |
302 |
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a2 = .25*(2.*(r1s+r2s) - d2 - (r2s-r1s)*(r2s-r1s)/d2); |
303 |
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/* no overlap? */ |
304 |
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if (a2 <= 0.) |
305 |
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return(0.); |
306 |
greg |
1.2 |
/* overlap, compute center */ |
307 |
greg |
1.1 |
l = sqrt((r1s - a2)/d2); |
308 |
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for (i = 0; i < 3; i++) |
309 |
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cc[i] = c1[i] + l*disp[i]; |
310 |
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return(a2); |
311 |
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} |
312 |
greg |
1.4 |
|
313 |
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314 |
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#ifdef DEBUG |
315 |
greg |
1.6 |
virtverb(sn, fp) /* print verbose description of virtual source */ |
316 |
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register int sn; |
317 |
greg |
1.4 |
FILE *fp; |
318 |
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{ |
319 |
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register int i; |
320 |
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|
321 |
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fprintf(fp, "%s virtual source %d in %s %s\n", |
322 |
greg |
1.6 |
source[sn].sflags & SDISTANT ? "distant" : "local", |
323 |
|
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sn, ofun[source[sn].so->otype].funame, |
324 |
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source[sn].so->oname); |
325 |
greg |
1.4 |
fprintf(fp, "\tat (%f,%f,%f)\n", |
326 |
greg |
1.6 |
source[sn].sloc[0], source[sn].sloc[1], source[sn].sloc[2]); |
327 |
greg |
1.4 |
fprintf(fp, "\tlinked to source %d (%s)\n", |
328 |
greg |
1.6 |
source[sn].sa.svnext, source[source[sn].sa.svnext].so->oname); |
329 |
|
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if (source[sn].sflags & SFOLLOW) |
330 |
greg |
1.4 |
fprintf(fp, "\talways followed\n"); |
331 |
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else |
332 |
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fprintf(fp, "\tnever followed\n"); |
333 |
greg |
1.6 |
if (!(source[sn].sflags & SSPOT)) |
334 |
greg |
1.4 |
return; |
335 |
|
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fprintf(fp, "\twith spot aim (%f,%f,%f) and size %f\n", |
336 |
greg |
1.6 |
source[sn].sl.s->aim[0], source[sn].sl.s->aim[1], |
337 |
|
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source[sn].sl.s->aim[2], source[sn].sl.s->siz); |
338 |
greg |
1.4 |
} |
339 |
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#endif |