1 |
greg |
1.1 |
/* Copyright (c) 1991 Regents of the University of California */ |
2 |
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3 |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
5 |
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#endif |
6 |
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7 |
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/* |
8 |
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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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*/ |
11 |
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12 |
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#include "ray.h" |
13 |
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14 |
greg |
1.7 |
#include "octree.h" |
15 |
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16 |
greg |
1.3 |
#include "otypes.h" |
17 |
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|
18 |
greg |
1.1 |
#include "source.h" |
19 |
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20 |
greg |
1.7 |
#include "random.h" |
21 |
greg |
1.1 |
|
22 |
greg |
1.22 |
#define MINSAMPLES 16 /* minimum number of pretest samples */ |
23 |
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#define STESTMAX 32 /* maximum seeks per sample */ |
24 |
greg |
1.1 |
|
25 |
greg |
1.13 |
|
26 |
greg |
1.7 |
double getdisk(); |
27 |
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28 |
greg |
1.1 |
static OBJECT *vobject; /* virtual source objects */ |
29 |
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static int nvobjects = 0; /* number of virtual source objects */ |
30 |
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31 |
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32 |
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markvirtuals() /* find and mark virtual sources */ |
33 |
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{ |
34 |
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register OBJREC *o; |
35 |
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register int i; |
36 |
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/* check number of direct relays */ |
37 |
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if (directrelay <= 0) |
38 |
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return; |
39 |
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/* find virtual source objects */ |
40 |
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for (i = 0; i < nobjects; i++) { |
41 |
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o = objptr(i); |
42 |
greg |
1.3 |
if (!issurface(o->otype) || o->omod == OVOID) |
43 |
greg |
1.1 |
continue; |
44 |
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if (!isvlight(objptr(o->omod)->otype)) |
45 |
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continue; |
46 |
greg |
1.3 |
if (sfun[o->otype].of == NULL || |
47 |
greg |
1.21 |
sfun[o->otype].of->getpleq == NULL) { |
48 |
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objerror(o,WARNING,"secondary sources not supported"); |
49 |
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continue; |
50 |
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} |
51 |
greg |
1.1 |
if (nvobjects == 0) |
52 |
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vobject = (OBJECT *)malloc(sizeof(OBJECT)); |
53 |
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else |
54 |
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vobject = (OBJECT *)realloc((char *)vobject, |
55 |
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(unsigned)(nvobjects+1)*sizeof(OBJECT)); |
56 |
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if (vobject == NULL) |
57 |
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error(SYSTEM, "out of memory in addvirtuals"); |
58 |
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vobject[nvobjects++] = i; |
59 |
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} |
60 |
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if (nvobjects == 0) |
61 |
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return; |
62 |
greg |
1.4 |
#ifdef DEBUG |
63 |
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fprintf(stderr, "found %d virtual source objects\n", nvobjects); |
64 |
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#endif |
65 |
greg |
1.1 |
/* append virtual sources */ |
66 |
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for (i = nsources; i-- > 0; ) |
67 |
greg |
1.7 |
addvirtuals(i, directrelay); |
68 |
greg |
1.1 |
/* done with our object list */ |
69 |
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free((char *)vobject); |
70 |
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nvobjects = 0; |
71 |
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} |
72 |
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73 |
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74 |
greg |
1.4 |
addvirtuals(sn, nr) /* add virtuals associated with source */ |
75 |
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int sn; |
76 |
greg |
1.1 |
int nr; |
77 |
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{ |
78 |
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register int i; |
79 |
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/* check relay limit first */ |
80 |
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if (nr <= 0) |
81 |
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return; |
82 |
greg |
1.7 |
if (source[sn].sflags & SSKIP) |
83 |
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return; |
84 |
greg |
1.1 |
/* check each virtual object for projection */ |
85 |
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for (i = 0; i < nvobjects; i++) |
86 |
greg |
1.3 |
/* vproject() calls us recursively */ |
87 |
greg |
1.4 |
vproject(objptr(vobject[i]), sn, nr-1); |
88 |
greg |
1.1 |
} |
89 |
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|
90 |
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|
91 |
greg |
1.4 |
vproject(o, sn, n) /* create projected source(s) if they exist */ |
92 |
greg |
1.3 |
OBJREC *o; |
93 |
greg |
1.4 |
int sn; |
94 |
greg |
1.3 |
int n; |
95 |
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{ |
96 |
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register int i; |
97 |
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register VSMATERIAL *vsmat; |
98 |
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MAT4 proj; |
99 |
greg |
1.4 |
int ns; |
100 |
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101 |
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if (o == source[sn].so) /* objects cannot project themselves */ |
102 |
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return; |
103 |
greg |
1.3 |
/* get virtual source material */ |
104 |
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vsmat = sfun[objptr(o->omod)->otype].mf; |
105 |
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/* project virtual sources */ |
106 |
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for (i = 0; i < vsmat->nproj; i++) |
107 |
greg |
1.4 |
if ((*vsmat->vproj)(proj, o, &source[sn], i)) |
108 |
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if ((ns = makevsrc(o, sn, proj)) >= 0) { |
109 |
greg |
1.17 |
source[ns].sa.sv.pn = i; |
110 |
greg |
1.4 |
#ifdef DEBUG |
111 |
greg |
1.6 |
virtverb(ns, stderr); |
112 |
greg |
1.4 |
#endif |
113 |
greg |
1.3 |
addvirtuals(ns, n); |
114 |
greg |
1.4 |
} |
115 |
greg |
1.3 |
} |
116 |
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|
117 |
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|
118 |
greg |
1.4 |
int |
119 |
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makevsrc(op, sn, pm) /* make virtual source if reasonable */ |
120 |
greg |
1.1 |
OBJREC *op; |
121 |
greg |
1.4 |
register int sn; |
122 |
greg |
1.1 |
MAT4 pm; |
123 |
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{ |
124 |
greg |
1.9 |
FVECT nsloc, nsnorm, ocent, v; |
125 |
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double maxrad2, d; |
126 |
greg |
1.3 |
int nsflags; |
127 |
greg |
1.1 |
SPOT theirspot, ourspot; |
128 |
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register int i; |
129 |
greg |
1.3 |
|
130 |
greg |
1.6 |
nsflags = source[sn].sflags | (SVIRTUAL|SSPOT|SFOLLOW); |
131 |
greg |
1.1 |
/* get object center and max. radius */ |
132 |
greg |
1.6 |
maxrad2 = getdisk(ocent, op, sn); |
133 |
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if (maxrad2 <= FTINY) /* too small? */ |
134 |
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return(-1); |
135 |
greg |
1.1 |
/* get location and spot */ |
136 |
greg |
1.4 |
if (source[sn].sflags & SDISTANT) { /* distant source */ |
137 |
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if (source[sn].sflags & SPROX) |
138 |
greg |
1.5 |
return(-1); /* should never get here! */ |
139 |
greg |
1.4 |
multv3(nsloc, source[sn].sloc, pm); |
140 |
greg |
1.17 |
normalize(nsloc); |
141 |
greg |
1.6 |
VCOPY(ourspot.aim, ocent); |
142 |
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ourspot.siz = PI*maxrad2; |
143 |
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ourspot.flen = 0.; |
144 |
greg |
1.4 |
if (source[sn].sflags & SSPOT) { |
145 |
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multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
146 |
greg |
1.19 |
d = sqrt(dist2(ourspot.aim, theirspot.aim)); |
147 |
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d = sqrt(source[sn].sl.s->siz/PI) + d*source[sn].ss; |
148 |
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theirspot.siz = PI*d*d; |
149 |
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ourspot.flen = theirspot.flen = source[sn].sl.s->flen; |
150 |
greg |
1.9 |
d = ourspot.siz; |
151 |
greg |
1.6 |
if (!commonbeam(&ourspot, &theirspot, nsloc)) |
152 |
greg |
1.9 |
return(-1); /* no overlap */ |
153 |
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if (ourspot.siz < d-FTINY) { /* it shrunk */ |
154 |
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d = beamdisk(v, op, &ourspot, nsloc); |
155 |
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if (d <= FTINY) |
156 |
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return(-1); |
157 |
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if (d < maxrad2) { |
158 |
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maxrad2 = d; |
159 |
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VCOPY(ocent, v); |
160 |
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} |
161 |
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} |
162 |
greg |
1.1 |
} |
163 |
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} else { /* local source */ |
164 |
greg |
1.4 |
multp3(nsloc, source[sn].sloc, pm); |
165 |
greg |
1.6 |
for (i = 0; i < 3; i++) |
166 |
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ourspot.aim[i] = ocent[i] - nsloc[i]; |
167 |
greg |
1.9 |
if ((d = normalize(ourspot.aim)) == 0.) |
168 |
greg |
1.6 |
return(-1); /* at source!! */ |
169 |
greg |
1.9 |
if (source[sn].sflags & SPROX && d > source[sn].sl.prox) |
170 |
greg |
1.6 |
return(-1); /* too far away */ |
171 |
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ourspot.flen = 0.; |
172 |
greg |
1.19 |
d = (sqrt(maxrad2) + source[sn].ss) / d; |
173 |
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if (d < 1.-FTINY) |
174 |
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ourspot.siz = 2.*PI*(1. - sqrt(1.-d*d)); |
175 |
greg |
1.14 |
else |
176 |
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nsflags &= ~SSPOT; |
177 |
greg |
1.4 |
if (source[sn].sflags & SSPOT) { |
178 |
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copystruct(&theirspot, source[sn].sl.s); |
179 |
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multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
180 |
greg |
1.17 |
normalize(theirspot.aim); |
181 |
greg |
1.14 |
if (nsflags & SSPOT) { |
182 |
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ourspot.flen = theirspot.flen; |
183 |
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d = ourspot.siz; |
184 |
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if (!commonspot(&ourspot, &theirspot, nsloc)) |
185 |
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return(-1); /* no overlap */ |
186 |
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} else { |
187 |
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nsflags |= SSPOT; |
188 |
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copystruct(&ourspot, &theirspot); |
189 |
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d = 2.*ourspot.siz; |
190 |
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} |
191 |
greg |
1.9 |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
192 |
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d = spotdisk(v, op, &ourspot, nsloc); |
193 |
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if (d <= FTINY) |
194 |
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return(-1); |
195 |
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if (d < maxrad2) { |
196 |
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maxrad2 = d; |
197 |
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VCOPY(ocent, v); |
198 |
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} |
199 |
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} |
200 |
greg |
1.1 |
} |
201 |
greg |
1.4 |
if (source[sn].sflags & SFLAT) { /* behind source? */ |
202 |
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multv3(nsnorm, source[sn].snorm, pm); |
203 |
greg |
1.17 |
normalize(nsnorm); |
204 |
greg |
1.20 |
if (nsflags & SSPOT && !checkspot(&ourspot, nsnorm)) |
205 |
greg |
1.5 |
return(-1); |
206 |
greg |
1.1 |
} |
207 |
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} |
208 |
greg |
1.7 |
/* pretest visibility */ |
209 |
|
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nsflags = vstestvis(nsflags, op, ocent, maxrad2, sn); |
210 |
|
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if (nsflags & SSKIP) |
211 |
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return(-1); /* obstructed */ |
212 |
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/* it all checks out, so make it */ |
213 |
greg |
1.6 |
if ((i = newsource()) < 0) |
214 |
greg |
1.1 |
goto memerr; |
215 |
greg |
1.6 |
source[i].sflags = nsflags; |
216 |
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VCOPY(source[i].sloc, nsloc); |
217 |
greg |
1.3 |
if (nsflags & SFLAT) |
218 |
greg |
1.6 |
VCOPY(source[i].snorm, nsnorm); |
219 |
|
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source[i].ss = source[sn].ss; source[i].ss2 = source[sn].ss2; |
220 |
greg |
1.14 |
if (nsflags & SSPOT) { |
221 |
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if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
222 |
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goto memerr; |
223 |
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copystruct(source[i].sl.s, &ourspot); |
224 |
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} |
225 |
greg |
1.3 |
if (nsflags & SPROX) |
226 |
greg |
1.6 |
source[i].sl.prox = source[sn].sl.prox; |
227 |
greg |
1.17 |
source[i].sa.sv.sn = sn; |
228 |
greg |
1.6 |
source[i].so = op; |
229 |
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return(i); |
230 |
greg |
1.1 |
memerr: |
231 |
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error(SYSTEM, "out of memory in makevsrc"); |
232 |
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} |
233 |
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234 |
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|
235 |
greg |
1.6 |
double |
236 |
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getdisk(oc, op, sn) /* get visible object disk */ |
237 |
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FVECT oc; |
238 |
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OBJREC *op; |
239 |
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register int sn; |
240 |
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{ |
241 |
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double rad2, roffs, offs, d, rd, rdoto; |
242 |
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FVECT rnrm, nrm; |
243 |
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/* first, use object getdisk function */ |
244 |
greg |
1.9 |
rad2 = getmaxdisk(oc, op); |
245 |
greg |
1.6 |
if (!(source[sn].sflags & SVIRTUAL)) |
246 |
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return(rad2); /* all done for normal source */ |
247 |
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/* check for correct side of relay surface */ |
248 |
greg |
1.9 |
roffs = getplaneq(rnrm, source[sn].so); |
249 |
greg |
1.6 |
rd = DOT(rnrm, source[sn].sloc); /* source projection */ |
250 |
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if (!(source[sn].sflags & SDISTANT)) |
251 |
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rd -= roffs; |
252 |
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d = DOT(rnrm, oc) - roffs; /* disk distance to relay plane */ |
253 |
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if ((d > 0.) ^ (rd > 0.)) |
254 |
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return(rad2); /* OK if opposite sides */ |
255 |
|
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if (d*d >= rad2) |
256 |
greg |
1.9 |
return(0.); /* no relay is possible */ |
257 |
greg |
1.6 |
/* we need a closer look */ |
258 |
greg |
1.9 |
offs = getplaneq(nrm, op); |
259 |
greg |
1.6 |
rdoto = DOT(rnrm, nrm); |
260 |
|
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if (d*d >= rad2*(1.-rdoto*rdoto)) |
261 |
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return(0.); /* disk entirely on projection side */ |
262 |
|
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/* should shrink disk but I'm lazy */ |
263 |
|
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return(rad2); |
264 |
|
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} |
265 |
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|
266 |
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|
267 |
greg |
1.7 |
int |
268 |
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vstestvis(f, o, oc, or2, sn) /* pretest source visibility */ |
269 |
|
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int f; /* virtual source flags */ |
270 |
|
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OBJREC *o; /* relay object */ |
271 |
|
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FVECT oc; /* relay object center */ |
272 |
|
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double or2; /* relay object radius squared */ |
273 |
|
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register int sn; /* target source number */ |
274 |
greg |
1.1 |
{ |
275 |
greg |
1.7 |
RAY sr; |
276 |
|
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FVECT onorm; |
277 |
|
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FVECT offsdir; |
278 |
|
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double or, d; |
279 |
greg |
1.8 |
int infront; |
280 |
greg |
1.16 |
int stestlim, ssn; |
281 |
greg |
1.11 |
int nhit, nok; |
282 |
greg |
1.7 |
register int i, n; |
283 |
|
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/* return if pretesting disabled */ |
284 |
|
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if (vspretest <= 0) |
285 |
|
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return(f); |
286 |
|
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/* get surface normal */ |
287 |
greg |
1.9 |
getplaneq(onorm, o); |
288 |
greg |
1.7 |
/* set number of rays to sample */ |
289 |
greg |
1.8 |
if (source[sn].sflags & SDISTANT) { |
290 |
greg |
1.22 |
n = 4.*or2/(thescene.cusize*thescene.cusize)*vspretest + .5; |
291 |
greg |
1.8 |
infront = DOT(onorm, source[sn].sloc) > 0.; |
292 |
|
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} else { |
293 |
|
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for (i = 0; i < 3; i++) |
294 |
|
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offsdir[i] = source[sn].sloc[i] - oc[i]; |
295 |
greg |
1.20 |
d = DOT(offsdir,offsdir); |
296 |
|
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if (d <= FTINY) |
297 |
|
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n = 2.*PI * vspretest + .5; |
298 |
|
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else |
299 |
|
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n = 2.*PI * (1.-sqrt(1./(1.+or2/d)))*vspretest + .5; |
300 |
greg |
1.8 |
infront = DOT(onorm, offsdir) > 0.; |
301 |
|
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} |
302 |
greg |
1.13 |
if (n < MINSAMPLES) n = MINSAMPLES; |
303 |
greg |
1.9 |
#ifdef DEBUG |
304 |
|
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fprintf(stderr, "pretesting source %d in object %s with %d rays\n", |
305 |
|
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sn, o->oname, n); |
306 |
|
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#endif |
307 |
greg |
1.7 |
/* sample */ |
308 |
greg |
1.8 |
or = sqrt(or2); |
309 |
greg |
1.16 |
stestlim = n*STESTMAX; |
310 |
|
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ssn = 0; |
311 |
greg |
1.11 |
nhit = nok = 0; |
312 |
greg |
1.7 |
while (n-- > 0) { |
313 |
greg |
1.8 |
/* get sample point */ |
314 |
|
|
do { |
315 |
greg |
1.16 |
if (ssn >= stestlim) { |
316 |
greg |
1.9 |
#ifdef DEBUG |
317 |
|
|
fprintf(stderr, "\ttoo hard to hit\n"); |
318 |
|
|
#endif |
319 |
greg |
1.8 |
return(f); /* too small a target! */ |
320 |
greg |
1.9 |
} |
321 |
greg |
1.25 |
multisamp(offsdir, 3, urand(sn*931+5827+ssn)); |
322 |
greg |
1.8 |
for (i = 0; i < 3; i++) |
323 |
greg |
1.23 |
offsdir[i] = or*(1. - 2.*offsdir[i]); |
324 |
greg |
1.16 |
ssn++; |
325 |
greg |
1.8 |
for (i = 0; i < 3; i++) |
326 |
|
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sr.rorg[i] = oc[i] + offsdir[i]; |
327 |
|
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d = DOT(offsdir,onorm); |
328 |
|
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if (infront) |
329 |
|
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for (i = 0; i < 3; i++) { |
330 |
|
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sr.rorg[i] -= (d-.0001)*onorm[i]; |
331 |
|
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sr.rdir[i] = -onorm[i]; |
332 |
|
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} |
333 |
|
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else |
334 |
|
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for (i = 0; i < 3; i++) { |
335 |
|
|
sr.rorg[i] -= (d+.0001)*onorm[i]; |
336 |
|
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sr.rdir[i] = onorm[i]; |
337 |
|
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} |
338 |
|
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rayorigin(&sr, NULL, PRIMARY, 1.0); |
339 |
|
|
} while (!(*ofun[o->otype].funp)(o, &sr)); |
340 |
|
|
/* check against source */ |
341 |
greg |
1.7 |
samplendx++; |
342 |
greg |
1.9 |
if (srcray(&sr, NULL, sn) == 0.) |
343 |
greg |
1.7 |
continue; |
344 |
|
|
sr.revf = srcvalue; |
345 |
|
|
rayvalue(&sr); |
346 |
|
|
if (bright(sr.rcol) <= FTINY) |
347 |
|
|
continue; |
348 |
greg |
1.11 |
nok++; |
349 |
greg |
1.7 |
/* check against obstructions */ |
350 |
greg |
1.18 |
rayclear(&sr); |
351 |
greg |
1.24 |
if (!localhit(&sr, &thescene) || sr.ro == source[sn].so) |
352 |
greg |
1.11 |
nhit++; |
353 |
|
|
if (nhit > 0 && nhit < nok) { |
354 |
greg |
1.9 |
#ifdef DEBUG |
355 |
greg |
1.11 |
fprintf(stderr, "\tpartially occluded\n"); |
356 |
greg |
1.9 |
#endif |
357 |
greg |
1.11 |
return(f); /* need to shadow test */ |
358 |
|
|
} |
359 |
greg |
1.1 |
} |
360 |
greg |
1.9 |
if (nhit == 0) { |
361 |
|
|
#ifdef DEBUG |
362 |
|
|
fprintf(stderr, "\t0%% hit rate\n"); |
363 |
|
|
#endif |
364 |
greg |
1.7 |
return(f | SSKIP); /* 0% hit rate: totally occluded */ |
365 |
greg |
1.9 |
} |
366 |
|
|
#ifdef DEBUG |
367 |
|
|
fprintf(stderr, "\t100%% hit rate\n"); |
368 |
|
|
#endif |
369 |
|
|
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
370 |
greg |
1.1 |
} |
371 |
greg |
1.7 |
|
372 |
greg |
1.4 |
|
373 |
|
|
#ifdef DEBUG |
374 |
greg |
1.6 |
virtverb(sn, fp) /* print verbose description of virtual source */ |
375 |
|
|
register int sn; |
376 |
greg |
1.4 |
FILE *fp; |
377 |
|
|
{ |
378 |
|
|
register int i; |
379 |
|
|
|
380 |
|
|
fprintf(fp, "%s virtual source %d in %s %s\n", |
381 |
greg |
1.6 |
source[sn].sflags & SDISTANT ? "distant" : "local", |
382 |
|
|
sn, ofun[source[sn].so->otype].funame, |
383 |
|
|
source[sn].so->oname); |
384 |
greg |
1.4 |
fprintf(fp, "\tat (%f,%f,%f)\n", |
385 |
greg |
1.6 |
source[sn].sloc[0], source[sn].sloc[1], source[sn].sloc[2]); |
386 |
greg |
1.4 |
fprintf(fp, "\tlinked to source %d (%s)\n", |
387 |
greg |
1.17 |
source[sn].sa.sv.sn, source[source[sn].sa.sv.sn].so->oname); |
388 |
greg |
1.6 |
if (source[sn].sflags & SFOLLOW) |
389 |
greg |
1.4 |
fprintf(fp, "\talways followed\n"); |
390 |
|
|
else |
391 |
|
|
fprintf(fp, "\tnever followed\n"); |
392 |
greg |
1.6 |
if (!(source[sn].sflags & SSPOT)) |
393 |
greg |
1.4 |
return; |
394 |
|
|
fprintf(fp, "\twith spot aim (%f,%f,%f) and size %f\n", |
395 |
greg |
1.6 |
source[sn].sl.s->aim[0], source[sn].sl.s->aim[1], |
396 |
|
|
source[sn].sl.s->aim[2], source[sn].sl.s->siz); |
397 |
greg |
1.4 |
} |
398 |
|
|
#endif |