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/* Copyright (c) 1991 Regents of the University of California */ |
2 |
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|
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#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
6 |
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|
4 |
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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. |
7 |
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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 "otypes.h" |
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|
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#include "source.h" |
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|
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#include "cone.h" |
19 |
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#include "random.h" |
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|
21 |
< |
#include "face.h" |
21 |
> |
#define MINSAMPLES 16 /* minimum number of pretest samples */ |
22 |
> |
#define STESTMAX 32 /* maximum seeks per sample */ |
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|
24 |
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|
23 |
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double intercircle(); |
24 |
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SRCREC *makevsrc(); |
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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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void |
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markvirtuals() /* find and mark virtual sources */ |
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{ |
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register OBJREC *o; |
39 |
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o = objptr(i); |
40 |
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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; |
44 |
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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"); |
47 |
> |
continue; |
48 |
> |
} |
49 |
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if (nvobjects == 0) |
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vobject = (OBJECT *)malloc(sizeof(OBJECT)); |
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else |
52 |
< |
vobject = (OBJECT *)realloc((char *)vobject, |
52 |
> |
vobject = (OBJECT *)realloc((void *)vobject, |
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(unsigned)(nvobjects+1)*sizeof(OBJECT)); |
54 |
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if (vobject == NULL) |
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error(SYSTEM, "out of memory in addvirtuals"); |
57 |
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} |
58 |
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if (nvobjects == 0) |
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return; |
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#ifdef DEBUG |
61 |
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fprintf(stderr, "found %d virtual source objects\n", nvobjects); |
62 |
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#endif |
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/* append virtual sources */ |
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for (i = nsources; i-- > 0; ) |
65 |
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if (!(source[i].sflags & SSKIP)) |
61 |
< |
addvirtuals(&source[i], directrelay); |
65 |
> |
addvirtuals(i, directrelay); |
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/* done with our object list */ |
67 |
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free((char *)vobject); |
67 |
> |
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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addvirtuals(sr, nr) /* add virtual sources associated with sr */ |
73 |
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SRCREC *sr; |
72 |
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void |
73 |
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addvirtuals(sn, nr) /* add virtuals associated with source */ |
74 |
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int sn; |
75 |
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int nr; |
76 |
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{ |
77 |
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register int i; |
78 |
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/* check relay limit first */ |
79 |
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if (nr <= 0) |
80 |
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return; |
81 |
+ |
if (source[sn].sflags & SSKIP) |
82 |
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return; |
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/* check each virtual object for projection */ |
84 |
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for (i = 0; i < nvobjects; i++) |
85 |
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/* vproject() calls us recursively */ |
86 |
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vproject(objptr(i), sr, nr-1); |
86 |
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vproject(objptr(vobject[i]), sn, nr-1); |
87 |
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} |
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|
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|
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vproject(o, s, n) /* create projected source(s) if they exist */ |
90 |
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void |
91 |
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vproject(o, sn, n) /* create projected source(s) if they exist */ |
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OBJREC *o; |
93 |
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SRCREC *s; |
93 |
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int sn; |
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int n; |
95 |
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{ |
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register int i; |
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register VSMATERIAL *vsmat; |
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MAT4 proj; |
99 |
< |
SRCREC *ns; |
99 |
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int ns; |
100 |
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|
101 |
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if (o == source[sn].so) /* objects cannot project themselves */ |
102 |
> |
return; |
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/* get virtual source material */ |
104 |
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vsmat = sfun[objptr(o->omod)->otype].mf; |
104 |
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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++) |
107 |
< |
if ((*vsmat->vproj)(proj, o, s, i)) |
108 |
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if ((ns = makevsrc(o, s, proj)) != NULL) |
107 |
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if ((*vsmat->vproj)(proj, o, &source[sn], i)) |
108 |
> |
if ((ns = makevsrc(o, sn, proj)) >= 0) { |
109 |
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source[ns].sa.sv.pn = i; |
110 |
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#ifdef DEBUG |
111 |
> |
virtverb(ns, stderr); |
112 |
> |
#endif |
113 |
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addvirtuals(ns, n); |
114 |
+ |
} |
115 |
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} |
116 |
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|
117 |
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|
118 |
< |
SRCREC * |
119 |
< |
makevsrc(op, sp, pm) /* make virtual source if reasonable */ |
118 |
> |
OBJREC * |
119 |
> |
vsmaterial(o) /* get virtual source material pointer */ |
120 |
> |
OBJREC *o; |
121 |
> |
{ |
122 |
> |
register int i; |
123 |
> |
register OBJREC *m; |
124 |
> |
|
125 |
> |
i = o->omod; |
126 |
> |
m = objptr(i); |
127 |
> |
if (m->otype != MAT_ILLUM || m->oargs.nsargs < 1 || |
128 |
> |
!strcmp(m->oargs.sarg[0], VOIDID) || |
129 |
> |
(i = lastmod(objndx(m), m->oargs.sarg[0])) == OVOID) |
130 |
> |
return(m); /* direct modifier */ |
131 |
> |
return(objptr(i)); /* illum alternate */ |
132 |
> |
} |
133 |
> |
|
134 |
> |
|
135 |
> |
int |
136 |
> |
makevsrc(op, sn, pm) /* make virtual source if reasonable */ |
137 |
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OBJREC *op; |
138 |
< |
register SRCREC *sp; |
138 |
> |
register int sn; |
139 |
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MAT4 pm; |
140 |
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{ |
141 |
< |
register SRCREC *newsrc; |
142 |
< |
FVECT nsloc, ocent, nsnorm; |
141 |
> |
FVECT nsloc, nsnorm, ocent, v; |
142 |
> |
double maxrad2, d; |
143 |
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int nsflags; |
111 |
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double maxrad2; |
112 |
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double d1; |
144 |
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SPOT theirspot, ourspot; |
145 |
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register int i; |
146 |
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|
147 |
< |
nsflags = (sp->sflags|(SVIRTUAL|SFOLLOW)) & ~SSPOT; |
147 |
> |
nsflags = source[sn].sflags | (SVIRTUAL|SSPOT|SFOLLOW); |
148 |
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/* get object center and max. radius */ |
149 |
< |
if (sfun[op->otype].of->getdisk != NULL) { |
150 |
< |
maxrad2 = (*sfun[op->otype].of->getdisk)(ocent, op); |
151 |
< |
if (maxrad2 <= FTINY) /* too small? */ |
121 |
< |
return(NULL); |
122 |
< |
nsflags |= SSPOT; |
123 |
< |
} |
149 |
> |
maxrad2 = getdisk(ocent, op, sn); |
150 |
> |
if (maxrad2 <= FTINY) /* too small? */ |
151 |
> |
return(-1); |
152 |
|
/* get location and spot */ |
153 |
< |
if (sp->sflags & SDISTANT) { /* distant source */ |
154 |
< |
if (sp->sflags & SPROX) |
155 |
< |
return(NULL); /* should never get here! */ |
156 |
< |
multv3(nsloc, sp->sloc, pm); |
157 |
< |
if (nsflags & SSPOT) { |
158 |
< |
VCOPY(ourspot.aim, ocent); |
159 |
< |
ourspot.siz = PI*maxrad2; |
160 |
< |
ourspot.flen = 0.; |
153 |
> |
if (source[sn].sflags & SDISTANT) { /* distant source */ |
154 |
> |
if (source[sn].sflags & SPROX) |
155 |
> |
return(-1); /* should never get here! */ |
156 |
> |
multv3(nsloc, source[sn].sloc, pm); |
157 |
> |
normalize(nsloc); |
158 |
> |
VCOPY(ourspot.aim, ocent); |
159 |
> |
ourspot.siz = PI*maxrad2; |
160 |
> |
ourspot.flen = -1.; |
161 |
> |
if (source[sn].sflags & SSPOT) { |
162 |
> |
multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
163 |
> |
/* adjust for source size */ |
164 |
> |
d = sqrt(dist2(ourspot.aim, theirspot.aim)); |
165 |
> |
d = sqrt(source[sn].sl.s->siz/PI) + d*source[sn].srad; |
166 |
> |
theirspot.siz = PI*d*d; |
167 |
> |
ourspot.flen = theirspot.flen = source[sn].sl.s->flen; |
168 |
> |
d = ourspot.siz; |
169 |
> |
if (!commonbeam(&ourspot, &theirspot, nsloc)) |
170 |
> |
return(-1); /* no overlap */ |
171 |
> |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
172 |
> |
d = beamdisk(v, op, &ourspot, nsloc); |
173 |
> |
if (d <= FTINY) |
174 |
> |
return(-1); |
175 |
> |
if (d < maxrad2) { |
176 |
> |
maxrad2 = d; |
177 |
> |
VCOPY(ocent, v); |
178 |
> |
} |
179 |
> |
} |
180 |
|
} |
134 |
– |
if (sp->sflags & SSPOT) { |
135 |
– |
copystruct(&theirspot, sp->sl.s); |
136 |
– |
multp3(theirspot.aim, sp->sl.s->aim, pm); |
137 |
– |
if (nsflags & SSPOT && |
138 |
– |
!commonbeam(&ourspot, &theirspot, nsloc)) |
139 |
– |
return(NULL); /* no overlap */ |
140 |
– |
} |
181 |
|
} else { /* local source */ |
182 |
< |
multp3(nsloc, sp->sloc, pm); |
183 |
< |
if (nsflags & SSPOT) { |
184 |
< |
for (i = 0; i < 3; i++) |
185 |
< |
ourspot.aim[i] = ocent[i] - nsloc[i]; |
186 |
< |
if ((d1 = normalize(ourspot.aim)) == 0.) |
187 |
< |
return(NULL); /* at source!! */ |
188 |
< |
if (sp->sflags & SPROX && d1 > sp->sl.prox) |
189 |
< |
return(NULL); /* too far away */ |
190 |
< |
ourspot.siz = 2.*PI*(1. - d1/sqrt(d1*d1+maxrad2)); |
191 |
< |
ourspot.flen = 0.; |
192 |
< |
} else if (sp->sflags & SPROX) { |
193 |
< |
FVECT norm; |
194 |
< |
double offs; |
195 |
< |
/* use distance from plane */ |
196 |
< |
offs = (*sfun[op->otype].of->getpleq)(norm, op); |
197 |
< |
d1 = DOT(norm, nsloc) - offs; |
198 |
< |
if (d1 > sp->sl.prox || d1 < -sp->sl.prox) |
199 |
< |
return(NULL); /* too far away */ |
160 |
< |
} |
161 |
< |
if (sp->sflags & SSPOT) { |
162 |
< |
copystruct(&theirspot, sp->sl.s); |
163 |
< |
multv3(theirspot.aim, sp->sl.s->aim, pm); |
182 |
> |
multp3(nsloc, source[sn].sloc, pm); |
183 |
> |
for (i = 0; i < 3; i++) |
184 |
> |
ourspot.aim[i] = ocent[i] - nsloc[i]; |
185 |
> |
if ((d = normalize(ourspot.aim)) == 0.) |
186 |
> |
return(-1); /* at source!! */ |
187 |
> |
if (source[sn].sflags & SPROX && d > source[sn].sl.prox) |
188 |
> |
return(-1); /* too far away */ |
189 |
> |
ourspot.flen = 0.; |
190 |
> |
/* adjust for source size */ |
191 |
> |
d = (sqrt(maxrad2) + source[sn].srad) / d; |
192 |
> |
if (d < 1.-FTINY) |
193 |
> |
ourspot.siz = 2.*PI*(1. - sqrt(1.-d*d)); |
194 |
> |
else |
195 |
> |
nsflags &= ~SSPOT; |
196 |
> |
if (source[sn].sflags & SSPOT) { |
197 |
> |
copystruct(&theirspot, source[sn].sl.s); |
198 |
> |
multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
199 |
> |
normalize(theirspot.aim); |
200 |
|
if (nsflags & SSPOT) { |
165 |
– |
if (!commonspot(&ourspot, &theirspot, nsloc)) |
166 |
– |
return(NULL); /* no overlap */ |
201 |
|
ourspot.flen = theirspot.flen; |
202 |
+ |
d = ourspot.siz; |
203 |
+ |
if (!commonspot(&ourspot, &theirspot, nsloc)) |
204 |
+ |
return(-1); /* no overlap */ |
205 |
+ |
} else { |
206 |
+ |
nsflags |= SSPOT; |
207 |
+ |
copystruct(&ourspot, &theirspot); |
208 |
+ |
d = 2.*ourspot.siz; |
209 |
|
} |
210 |
+ |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
211 |
+ |
d = spotdisk(v, op, &ourspot, nsloc); |
212 |
+ |
if (d <= FTINY) |
213 |
+ |
return(-1); |
214 |
+ |
if (d < maxrad2) { |
215 |
+ |
maxrad2 = d; |
216 |
+ |
VCOPY(ocent, v); |
217 |
+ |
} |
218 |
+ |
} |
219 |
|
} |
220 |
< |
if (sp->sflags & SFLAT) { /* check for behind source */ |
221 |
< |
multv3(nsnorm, sp->snorm, pm); |
222 |
< |
if (nsflags & SSPOT && checkspot(&ourspot, nsnorm) < 0) |
223 |
< |
return(NULL); |
220 |
> |
if (source[sn].sflags & SFLAT) { /* behind source? */ |
221 |
> |
multv3(nsnorm, source[sn].snorm, pm); |
222 |
> |
normalize(nsnorm); |
223 |
> |
if (nsflags & SSPOT && !checkspot(&ourspot, nsnorm)) |
224 |
> |
return(-1); |
225 |
|
} |
226 |
|
} |
227 |
< |
/* everything is OK, make source */ |
228 |
< |
if ((newsrc = newsource()) == NULL) |
227 |
> |
/* pretest visibility */ |
228 |
> |
nsflags = vstestvis(nsflags, op, ocent, maxrad2, sn); |
229 |
> |
if (nsflags & SSKIP) |
230 |
> |
return(-1); /* obstructed */ |
231 |
> |
/* it all checks out, so make it */ |
232 |
> |
if ((i = newsource()) < 0) |
233 |
|
goto memerr; |
234 |
< |
newsrc->sflags = nsflags; |
235 |
< |
VCOPY(newsrc->sloc, nsloc); |
234 |
> |
source[i].sflags = nsflags; |
235 |
> |
VCOPY(source[i].sloc, nsloc); |
236 |
> |
multv3(source[i].ss[SU], source[sn].ss[SU], pm); |
237 |
> |
multv3(source[i].ss[SV], source[sn].ss[SV], pm); |
238 |
|
if (nsflags & SFLAT) |
239 |
< |
VCOPY(newsrc->snorm, nsnorm); |
240 |
< |
newsrc->ss = sp->ss; newsrc->ss2 = sp->ss2; |
241 |
< |
if ((nsflags | sp->sflags) & SSPOT) { |
242 |
< |
if ((newsrc->sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
239 |
> |
VCOPY(source[i].snorm, nsnorm); |
240 |
> |
else |
241 |
> |
multv3(source[i].ss[SW], source[sn].ss[SW], pm); |
242 |
> |
source[i].srad = source[sn].srad; |
243 |
> |
source[i].ss2 = source[sn].ss2; |
244 |
> |
if (nsflags & SSPOT) { |
245 |
> |
if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
246 |
|
goto memerr; |
247 |
< |
if (nsflags & SSPOT) |
188 |
< |
copystruct(newsrc->sl.s, &ourspot); |
189 |
< |
else |
190 |
< |
copystruct(newsrc->sl.s, &theirspot); |
191 |
< |
newsrc->sflags |= SSPOT; |
247 |
> |
copystruct(source[i].sl.s, &ourspot); |
248 |
|
} |
249 |
|
if (nsflags & SPROX) |
250 |
< |
newsrc->sl.prox = sp->sl.prox; |
251 |
< |
newsrc->sa.svnext = sp - source; |
252 |
< |
return(newsrc); |
250 |
> |
source[i].sl.prox = source[sn].sl.prox; |
251 |
> |
source[i].sa.sv.sn = sn; |
252 |
> |
source[i].so = op; |
253 |
> |
return(i); |
254 |
|
memerr: |
255 |
|
error(SYSTEM, "out of memory in makevsrc"); |
256 |
|
} |
257 |
|
|
258 |
|
|
259 |
< |
commonspot(sp1, sp2, org) /* set sp1 to intersection of sp1 and sp2 */ |
260 |
< |
register SPOT *sp1, *sp2; |
261 |
< |
FVECT org; |
259 |
> |
double |
260 |
> |
getdisk(oc, op, sn) /* get visible object disk */ |
261 |
> |
FVECT oc; |
262 |
> |
OBJREC *op; |
263 |
> |
register int sn; |
264 |
|
{ |
265 |
< |
FVECT cent; |
266 |
< |
double rad2, cos1, cos2; |
267 |
< |
|
268 |
< |
cos1 = 1. - sp1->siz/(2.*PI); |
269 |
< |
cos2 = 1. - sp2->siz/(2.*PI); |
270 |
< |
if (sp2->siz >= 2.*PI-FTINY) /* BIG, just check overlap */ |
271 |
< |
return(DOT(sp1->aim,sp2->aim) >= cos1*cos2 - |
272 |
< |
sqrt((1.-cos1*cos1)*(1.-cos2*cos2))); |
273 |
< |
/* compute and check disks */ |
274 |
< |
rad2 = intercircle(cent, sp1->aim, sp2->aim, |
275 |
< |
1./(cos1*cos1) - 1., 1./(cos2*cos2) - 1.); |
276 |
< |
if (rad2 <= FTINY || normalize(cent) == 0.) |
277 |
< |
return(0); |
278 |
< |
VCOPY(sp1->aim, cent); |
279 |
< |
sp1->siz = 2.*PI*(1. - 1./sqrt(1.+rad2)); |
280 |
< |
return(1); |
265 |
> |
double rad2, roffs, offs, d, rd, rdoto; |
266 |
> |
FVECT rnrm, nrm; |
267 |
> |
/* first, use object getdisk function */ |
268 |
> |
rad2 = getmaxdisk(oc, op); |
269 |
> |
if (!(source[sn].sflags & SVIRTUAL)) |
270 |
> |
return(rad2); /* all done for normal source */ |
271 |
> |
/* check for correct side of relay surface */ |
272 |
> |
roffs = getplaneq(rnrm, source[sn].so); |
273 |
> |
rd = DOT(rnrm, source[sn].sloc); /* source projection */ |
274 |
> |
if (!(source[sn].sflags & SDISTANT)) |
275 |
> |
rd -= roffs; |
276 |
> |
d = DOT(rnrm, oc) - roffs; /* disk distance to relay plane */ |
277 |
> |
if ((d > 0.) ^ (rd > 0.)) |
278 |
> |
return(rad2); /* OK if opposite sides */ |
279 |
> |
if (d*d >= rad2) |
280 |
> |
return(0.); /* no relay is possible */ |
281 |
> |
/* we need a closer look */ |
282 |
> |
offs = getplaneq(nrm, op); |
283 |
> |
rdoto = DOT(rnrm, nrm); |
284 |
> |
if (d*d >= rad2*(1.-rdoto*rdoto)) |
285 |
> |
return(0.); /* disk entirely on projection side */ |
286 |
> |
/* should shrink disk but I'm lazy */ |
287 |
> |
return(rad2); |
288 |
|
} |
289 |
|
|
290 |
|
|
291 |
< |
commonbeam(sp1, sp2, dir) /* set sp1 to intersection of sp1 and sp2 */ |
292 |
< |
register SPOT *sp1, *sp2; |
293 |
< |
FVECT dir; |
291 |
> |
int |
292 |
> |
vstestvis(f, o, oc, or2, sn) /* pretest source visibility */ |
293 |
> |
int f; /* virtual source flags */ |
294 |
> |
OBJREC *o; /* relay object */ |
295 |
> |
FVECT oc; /* relay object center */ |
296 |
> |
double or2; /* relay object radius squared */ |
297 |
> |
register int sn; /* target source number */ |
298 |
|
{ |
299 |
< |
FVECT cent, c1, c2; |
300 |
< |
double rad2, d; |
301 |
< |
register int i; |
302 |
< |
/* move centers to common plane */ |
303 |
< |
d = DOT(sp1->aim, dir); |
304 |
< |
for (i = 0; i < 3; i++) |
305 |
< |
c1[i] = sp1->aim[i] - d*dir[i]; |
306 |
< |
d = DOT(sp2->aim, dir); |
307 |
< |
for (i = 0; i < 3; i++) |
308 |
< |
c2[i] = sp2->aim[i] - d*dir[i]; |
309 |
< |
/* compute overlap */ |
310 |
< |
rad2 = intercircle(cent, c1, c2, sp1->siz/PI, sp2->siz/PI); |
311 |
< |
if (rad2 <= FTINY) |
312 |
< |
return(0); |
313 |
< |
VCOPY(sp1->aim, cent); |
314 |
< |
sp1->siz = PI*rad2; |
315 |
< |
return(1); |
299 |
> |
RAY sr; |
300 |
> |
FVECT onorm; |
301 |
> |
FVECT offsdir; |
302 |
> |
SRCINDEX si; |
303 |
> |
double or, d; |
304 |
> |
int stestlim, ssn; |
305 |
> |
int nhit, nok; |
306 |
> |
register int i, n; |
307 |
> |
/* return if pretesting disabled */ |
308 |
> |
if (vspretest <= 0) |
309 |
> |
return(f); |
310 |
> |
/* get surface normal */ |
311 |
> |
getplaneq(onorm, o); |
312 |
> |
/* set number of rays to sample */ |
313 |
> |
if (source[sn].sflags & SDISTANT) { |
314 |
> |
/* 32. == heuristic constant */ |
315 |
> |
n = 32.*or2/(thescene.cusize*thescene.cusize)*vspretest + .5; |
316 |
> |
} else { |
317 |
> |
for (i = 0; i < 3; i++) |
318 |
> |
offsdir[i] = source[sn].sloc[i] - oc[i]; |
319 |
> |
d = DOT(offsdir,offsdir); |
320 |
> |
if (d <= FTINY) |
321 |
> |
n = 2.*PI * vspretest + .5; |
322 |
> |
else |
323 |
> |
n = 2.*PI * (1.-sqrt(1./(1.+or2/d)))*vspretest + .5; |
324 |
> |
} |
325 |
> |
if (n < MINSAMPLES) n = MINSAMPLES; |
326 |
> |
#ifdef DEBUG |
327 |
> |
fprintf(stderr, "pretesting source %d in object %s with %d rays\n", |
328 |
> |
sn, o->oname, n); |
329 |
> |
#endif |
330 |
> |
/* sample */ |
331 |
> |
or = sqrt(or2); |
332 |
> |
stestlim = n*STESTMAX; |
333 |
> |
ssn = 0; |
334 |
> |
nhit = nok = 0; |
335 |
> |
initsrcindex(&si); |
336 |
> |
while (n-- > 0) { |
337 |
> |
/* get sample point */ |
338 |
> |
do { |
339 |
> |
if (ssn >= stestlim) { |
340 |
> |
#ifdef DEBUG |
341 |
> |
fprintf(stderr, "\ttoo hard to hit\n"); |
342 |
> |
#endif |
343 |
> |
return(f); /* too small a target! */ |
344 |
> |
} |
345 |
> |
multisamp(offsdir, 3, urand(sn*931+5827+ssn)); |
346 |
> |
for (i = 0; i < 3; i++) |
347 |
> |
offsdir[i] = or*(1. - 2.*offsdir[i]); |
348 |
> |
ssn++; |
349 |
> |
d = 1. - DOT(offsdir, onorm); |
350 |
> |
for (i = 0; i < 3; i++) { |
351 |
> |
sr.rorg[i] = oc[i] + offsdir[i] + d*onorm[i]; |
352 |
> |
sr.rdir[i] = -onorm[i]; |
353 |
> |
} |
354 |
> |
sr.rmax = 0.0; |
355 |
> |
rayorigin(&sr, NULL, PRIMARY, 1.0); |
356 |
> |
} while (!(*ofun[o->otype].funp)(o, &sr)); |
357 |
> |
/* check against source */ |
358 |
> |
VCOPY(sr.rorg, sr.rop); /* starting from intersection */ |
359 |
> |
samplendx++; |
360 |
> |
if (si.sp >= si.np-1 || |
361 |
> |
!srcray(&sr, NULL, &si) || sr.rsrc != sn) { |
362 |
> |
si.sn = sn-1; /* reset index to our source */ |
363 |
> |
si.np = 0; |
364 |
> |
if (!srcray(&sr, NULL, &si) || sr.rsrc != sn) |
365 |
> |
continue; /* can't get there from here */ |
366 |
> |
} |
367 |
> |
sr.revf = srcvalue; |
368 |
> |
rayvalue(&sr); /* check sample validity */ |
369 |
> |
if (bright(sr.rcol) <= FTINY) |
370 |
> |
continue; |
371 |
> |
nok++; /* got sample; check obstructions */ |
372 |
> |
rayclear(&sr); |
373 |
> |
sr.revf = raytrace; |
374 |
> |
rayvalue(&sr); |
375 |
> |
if (bright(sr.rcol) > FTINY) |
376 |
> |
nhit++; |
377 |
> |
if (nhit > 0 && nhit < nok) { |
378 |
> |
#ifdef DEBUG |
379 |
> |
fprintf(stderr, "\tpartially occluded\n"); |
380 |
> |
#endif |
381 |
> |
return(f); /* need to shadow test */ |
382 |
> |
} |
383 |
> |
} |
384 |
> |
if (nhit == 0) { |
385 |
> |
#ifdef DEBUG |
386 |
> |
fprintf(stderr, "\t0%% hit rate\n"); |
387 |
> |
#endif |
388 |
> |
return(f | SSKIP); /* 0% hit rate: totally occluded */ |
389 |
> |
} |
390 |
> |
#ifdef DEBUG |
391 |
> |
fprintf(stderr, "\t100%% hit rate\n"); |
392 |
> |
#endif |
393 |
> |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
394 |
|
} |
395 |
+ |
|
396 |
|
|
397 |
< |
|
398 |
< |
checkspot(sp, nrm) /* check spotlight for behind source */ |
399 |
< |
register SPOT *sp; |
400 |
< |
FVECT nrm; |
397 |
> |
#ifdef DEBUG |
398 |
> |
void |
399 |
> |
virtverb(sn, fp) /* print verbose description of virtual source */ |
400 |
> |
register int sn; |
401 |
> |
FILE *fp; |
402 |
|
{ |
253 |
– |
double d, d1; |
254 |
– |
|
255 |
– |
d = DOT(sp->aim, nrm); |
256 |
– |
if (d > FTINY) /* center in front? */ |
257 |
– |
return(0); |
258 |
– |
/* else check horizon */ |
259 |
– |
d1 = 1. - sp->siz/(2.*PI); |
260 |
– |
return(1.-FTINY-d*d > d1*d1); |
261 |
– |
} |
262 |
– |
|
263 |
– |
|
264 |
– |
double |
265 |
– |
intercircle(cc, c1, c2, r1s, r2s) /* intersect two circles */ |
266 |
– |
FVECT cc; /* midpoint (return value) */ |
267 |
– |
FVECT c1, c2; /* circle centers */ |
268 |
– |
double r1s, r2s; /* radii squared */ |
269 |
– |
{ |
270 |
– |
double a2, d2, l; |
271 |
– |
FVECT disp; |
403 |
|
register int i; |
404 |
|
|
405 |
< |
for (i = 0; i < 3; i++) |
406 |
< |
disp[i] = c2[i] - c1[i]; |
407 |
< |
d2 = DOT(disp,disp); |
408 |
< |
/* circle within overlap? */ |
409 |
< |
if (r1s < r2s) { |
410 |
< |
if (r2s >= r1s + d2) { |
411 |
< |
VCOPY(cc, c1); |
412 |
< |
return(r1s); |
413 |
< |
} |
414 |
< |
} else { |
415 |
< |
if (r1s >= r2s + d2) { |
416 |
< |
VCOPY(cc, c2); |
417 |
< |
return(r2s); |
418 |
< |
} |
419 |
< |
} |
420 |
< |
a2 = .25*(2.*(r1s+r2s) - d2 - (r2s-r1s)*(r2s-r1s)/d2); |
421 |
< |
/* no overlap? */ |
291 |
< |
if (a2 <= 0.) |
292 |
< |
return(0.); |
293 |
< |
/* overlap, compute center */ |
294 |
< |
l = sqrt((r1s - a2)/d2); |
295 |
< |
for (i = 0; i < 3; i++) |
296 |
< |
cc[i] = c1[i] + l*disp[i]; |
297 |
< |
return(a2); |
405 |
> |
fprintf(fp, "%s virtual source %d in %s %s\n", |
406 |
> |
source[sn].sflags & SDISTANT ? "distant" : "local", |
407 |
> |
sn, ofun[source[sn].so->otype].funame, |
408 |
> |
source[sn].so->oname); |
409 |
> |
fprintf(fp, "\tat (%f,%f,%f)\n", |
410 |
> |
source[sn].sloc[0], source[sn].sloc[1], source[sn].sloc[2]); |
411 |
> |
fprintf(fp, "\tlinked to source %d (%s)\n", |
412 |
> |
source[sn].sa.sv.sn, source[source[sn].sa.sv.sn].so->oname); |
413 |
> |
if (source[sn].sflags & SFOLLOW) |
414 |
> |
fprintf(fp, "\talways followed\n"); |
415 |
> |
else |
416 |
> |
fprintf(fp, "\tnever followed\n"); |
417 |
> |
if (!(source[sn].sflags & SSPOT)) |
418 |
> |
return; |
419 |
> |
fprintf(fp, "\twith spot aim (%f,%f,%f) and size %f\n", |
420 |
> |
source[sn].sl.s->aim[0], source[sn].sl.s->aim[1], |
421 |
> |
source[sn].sl.s->aim[2], source[sn].sl.s->siz); |
422 |
|
} |
423 |
+ |
#endif |