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/* Copyright (c) 1991 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* Routines for simulating virtual light sources |
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* Thus far, we only support planar mirrors. |
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* |
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* External symbols declared in source.h |
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*/ |
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#include "copyright.h" |
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|
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#include "ray.h" |
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|
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#include "octree.h" |
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|
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#include "otypes.h" |
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|
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#include "source.h" |
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|
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#include "random.h" |
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|
21 |
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#define MINSAMPLES 5 /* minimum number of pretest samples */ |
22 |
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#define STESTMAX 30 /* maximum seeks per sample */ |
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#define MINSAMPLES 16 /* minimum number of pretest samples */ |
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#define STESTMAX 32 /* maximum seeks per sample */ |
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|
24 |
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#define FEQ(a,b) ((a)-(b)+FTINY >= 0 && (b)-(a)+FTINY >= 0) |
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|
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double getdisk(); |
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|
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static OBJECT *vobject; /* virtual source objects */ |
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static int nvobjects = 0; /* number of virtual source objects */ |
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|
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|
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markvirtuals() /* find and mark virtual sources */ |
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static int |
32 |
> |
isident4(MAT4 m) |
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{ |
34 |
< |
register OBJREC *o; |
35 |
< |
register int i; |
34 |
> |
int i, j; |
35 |
> |
|
36 |
> |
for (i = 4; i--; ) |
37 |
> |
for (j = 4; j--; ) |
38 |
> |
if (!FEQ(m[i][j], i==j)) |
39 |
> |
return(0); |
40 |
> |
return(1); |
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> |
} |
42 |
> |
|
43 |
> |
|
44 |
> |
void |
45 |
> |
markvirtuals(void) /* find and mark virtual sources */ |
46 |
> |
{ |
47 |
> |
OBJREC *o; |
48 |
> |
int i; |
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/* check number of direct relays */ |
50 |
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if (directrelay <= 0) |
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return; |
52 |
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/* find virtual source objects */ |
53 |
< |
for (i = 0; i < nobjects; i++) { |
53 |
> |
for (i = 0; i < nsceneobjs; i++) { |
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o = objptr(i); |
55 |
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if (!issurface(o->otype) || o->omod == OVOID) |
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continue; |
57 |
< |
if (!isvlight(objptr(o->omod)->otype)) |
57 |
> |
if (!isvlight(vsmaterial(o)->otype)) |
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continue; |
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if (sfun[o->otype].of == NULL || |
60 |
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sfun[o->otype].of->getpleq == NULL) { |
64 |
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if (nvobjects == 0) |
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vobject = (OBJECT *)malloc(sizeof(OBJECT)); |
66 |
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else |
67 |
< |
vobject = (OBJECT *)realloc((char *)vobject, |
67 |
> |
vobject = (OBJECT *)realloc((void *)vobject, |
68 |
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(unsigned)(nvobjects+1)*sizeof(OBJECT)); |
69 |
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if (vobject == NULL) |
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error(SYSTEM, "out of memory in addvirtuals"); |
79 |
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for (i = nsources; i-- > 0; ) |
80 |
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addvirtuals(i, directrelay); |
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/* done with our object list */ |
82 |
< |
free((char *)vobject); |
82 |
> |
free((void *)vobject); |
83 |
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nvobjects = 0; |
84 |
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} |
85 |
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|
86 |
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|
87 |
< |
addvirtuals(sn, nr) /* add virtuals associated with source */ |
88 |
< |
int sn; |
89 |
< |
int nr; |
87 |
> |
void |
88 |
> |
addvirtuals( /* add virtuals associated with source */ |
89 |
> |
int sn, |
90 |
> |
int nr |
91 |
> |
) |
92 |
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{ |
93 |
< |
register int i; |
93 |
> |
int i; |
94 |
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/* check relay limit first */ |
95 |
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if (nr <= 0) |
96 |
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return; |
103 |
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} |
104 |
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|
105 |
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|
106 |
< |
vproject(o, sn, n) /* create projected source(s) if they exist */ |
107 |
< |
OBJREC *o; |
108 |
< |
int sn; |
109 |
< |
int n; |
106 |
> |
void |
107 |
> |
vproject( /* create projected source(s) if they exist */ |
108 |
> |
OBJREC *o, |
109 |
> |
int sn, |
110 |
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int n |
111 |
> |
) |
112 |
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{ |
113 |
< |
register int i; |
114 |
< |
register VSMATERIAL *vsmat; |
113 |
> |
int i; |
114 |
> |
VSMATERIAL *vsmat; |
115 |
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MAT4 proj; |
116 |
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int ns; |
117 |
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|
118 |
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if (o == source[sn].so) /* objects cannot project themselves */ |
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return; |
120 |
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/* get virtual source material */ |
121 |
< |
vsmat = sfun[objptr(o->omod)->otype].mf; |
121 |
> |
vsmat = sfun[vsmaterial(o)->otype].mf; |
122 |
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/* project virtual sources */ |
123 |
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for (i = 0; i < vsmat->nproj; i++) |
124 |
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if ((*vsmat->vproj)(proj, o, &source[sn], i)) |
132 |
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} |
133 |
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|
134 |
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|
135 |
+ |
OBJREC * |
136 |
+ |
vsmaterial( /* get virtual source material pointer */ |
137 |
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OBJREC *o |
138 |
+ |
) |
139 |
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{ |
140 |
+ |
int i; |
141 |
+ |
OBJREC *m; |
142 |
+ |
|
143 |
+ |
i = o->omod; |
144 |
+ |
m = findmaterial(objptr(i)); |
145 |
+ |
if (m == NULL) |
146 |
+ |
return(objptr(i)); |
147 |
+ |
if (m->otype != MAT_ILLUM || m->oargs.nsargs < 1 || |
148 |
+ |
!strcmp(m->oargs.sarg[0], VOIDID) || |
149 |
+ |
(i = lastmod(objndx(m), m->oargs.sarg[0])) == OVOID) |
150 |
+ |
return(m); /* direct modifier */ |
151 |
+ |
return(objptr(i)); /* illum alternate */ |
152 |
+ |
} |
153 |
+ |
|
154 |
+ |
|
155 |
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int |
156 |
< |
makevsrc(op, sn, pm) /* make virtual source if reasonable */ |
157 |
< |
OBJREC *op; |
158 |
< |
register int sn; |
159 |
< |
MAT4 pm; |
156 |
> |
makevsrc( /* make virtual source if reasonable */ |
157 |
> |
OBJREC *op, |
158 |
> |
int sn, |
159 |
> |
MAT4 pm |
160 |
> |
) |
161 |
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{ |
162 |
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FVECT nsloc, nsnorm, ocent, v; |
163 |
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double maxrad2, d; |
164 |
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int nsflags; |
165 |
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SPOT theirspot, ourspot; |
166 |
< |
register int i; |
167 |
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|
166 |
> |
int i; |
167 |
> |
/* check for no-op */ |
168 |
> |
if (isident4(pm)) |
169 |
> |
return(0); |
170 |
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nsflags = source[sn].sflags | (SVIRTUAL|SSPOT|SFOLLOW); |
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/* get object center and max. radius */ |
172 |
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maxrad2 = getdisk(ocent, op, sn); |
180 |
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normalize(nsloc); |
181 |
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VCOPY(ourspot.aim, ocent); |
182 |
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ourspot.siz = PI*maxrad2; |
183 |
< |
ourspot.flen = 0.; |
183 |
> |
ourspot.flen = -1.; |
184 |
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if (source[sn].sflags & SSPOT) { |
185 |
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multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
186 |
+ |
/* adjust for source size */ |
187 |
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d = sqrt(dist2(ourspot.aim, theirspot.aim)); |
188 |
< |
d = sqrt(source[sn].sl.s->siz/PI) + d*source[sn].ss; |
188 |
> |
d = sqrt(source[sn].sl.s->siz/PI) + d*source[sn].srad; |
189 |
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theirspot.siz = PI*d*d; |
190 |
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ourspot.flen = theirspot.flen = source[sn].sl.s->flen; |
191 |
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d = ourspot.siz; |
210 |
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if (source[sn].sflags & SPROX && d > source[sn].sl.prox) |
211 |
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return(-1); /* too far away */ |
212 |
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ourspot.flen = 0.; |
213 |
< |
d = (sqrt(maxrad2) + source[sn].ss) / d; |
213 |
> |
/* adjust for source size */ |
214 |
> |
d = (sqrt(maxrad2) + source[sn].srad) / d; |
215 |
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if (d < 1.-FTINY) |
216 |
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ourspot.siz = 2.*PI*(1. - sqrt(1.-d*d)); |
217 |
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else |
218 |
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nsflags &= ~SSPOT; |
219 |
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if (source[sn].sflags & SSPOT) { |
220 |
< |
copystruct(&theirspot, source[sn].sl.s); |
220 |
> |
theirspot = *(source[sn].sl.s); |
221 |
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multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
222 |
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normalize(theirspot.aim); |
223 |
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if (nsflags & SSPOT) { |
227 |
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return(-1); /* no overlap */ |
228 |
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} else { |
229 |
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nsflags |= SSPOT; |
230 |
< |
copystruct(&ourspot, &theirspot); |
230 |
> |
ourspot = theirspot; |
231 |
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d = 2.*ourspot.siz; |
232 |
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} |
233 |
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if (ourspot.siz < d-FTINY) { /* it shrunk */ |
256 |
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goto memerr; |
257 |
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source[i].sflags = nsflags; |
258 |
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VCOPY(source[i].sloc, nsloc); |
259 |
+ |
multv3(source[i].ss[SU], source[sn].ss[SU], pm); |
260 |
+ |
multv3(source[i].ss[SV], source[sn].ss[SV], pm); |
261 |
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if (nsflags & SFLAT) |
262 |
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VCOPY(source[i].snorm, nsnorm); |
263 |
< |
source[i].ss = source[sn].ss; source[i].ss2 = source[sn].ss2; |
263 |
> |
else |
264 |
> |
multv3(source[i].ss[SW], source[sn].ss[SW], pm); |
265 |
> |
source[i].srad = source[sn].srad; |
266 |
> |
source[i].ss2 = source[sn].ss2; |
267 |
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if (nsflags & SSPOT) { |
268 |
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if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
269 |
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goto memerr; |
270 |
< |
copystruct(source[i].sl.s, &ourspot); |
270 |
> |
*(source[i].sl.s) = ourspot; |
271 |
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} |
272 |
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if (nsflags & SPROX) |
273 |
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source[i].sl.prox = source[sn].sl.prox; |
276 |
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return(i); |
277 |
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memerr: |
278 |
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error(SYSTEM, "out of memory in makevsrc"); |
279 |
+ |
return -1; /* pro forma return */ |
280 |
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} |
281 |
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|
282 |
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|
283 |
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double |
284 |
< |
getdisk(oc, op, sn) /* get visible object disk */ |
285 |
< |
FVECT oc; |
286 |
< |
OBJREC *op; |
287 |
< |
register int sn; |
284 |
> |
getdisk( /* get visible object disk */ |
285 |
> |
FVECT oc, |
286 |
> |
OBJREC *op, |
287 |
> |
int sn |
288 |
> |
) |
289 |
|
{ |
290 |
|
double rad2, roffs, offs, d, rd, rdoto; |
291 |
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FVECT rnrm, nrm; |
314 |
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|
315 |
|
|
316 |
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int |
317 |
< |
vstestvis(f, o, oc, or2, sn) /* pretest source visibility */ |
318 |
< |
int f; /* virtual source flags */ |
319 |
< |
OBJREC *o; /* relay object */ |
320 |
< |
FVECT oc; /* relay object center */ |
321 |
< |
double or2; /* relay object radius squared */ |
322 |
< |
register int sn; /* target source number */ |
317 |
> |
vstestvis( /* pretest source visibility */ |
318 |
> |
int f, /* virtual source flags */ |
319 |
> |
OBJREC *o, /* relay object */ |
320 |
> |
FVECT oc, /* relay object center */ |
321 |
> |
double or2, /* relay object radius squared */ |
322 |
> |
int sn /* target source number */ |
323 |
> |
) |
324 |
|
{ |
325 |
|
RAY sr; |
326 |
|
FVECT onorm; |
327 |
< |
FVECT offsdir; |
328 |
< |
double or, d; |
329 |
< |
int infront; |
327 |
> |
double offsdir[3]; |
328 |
> |
SRCINDEX si; |
329 |
> |
double or, d, d1; |
330 |
|
int stestlim, ssn; |
331 |
|
int nhit, nok; |
332 |
< |
register int i, n; |
332 |
> |
int i, n; |
333 |
|
/* return if pretesting disabled */ |
334 |
|
if (vspretest <= 0) |
335 |
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return(f); |
337 |
|
getplaneq(onorm, o); |
338 |
|
/* set number of rays to sample */ |
339 |
|
if (source[sn].sflags & SDISTANT) { |
340 |
< |
n = (2./3.*PI*PI)*or2/(thescene.cusize*thescene.cusize)* |
341 |
< |
vspretest + .5; |
292 |
< |
infront = DOT(onorm, source[sn].sloc) > 0.; |
340 |
> |
/* 32. == heuristic constant */ |
341 |
> |
n = 32.*or2/(thescene.cusize*thescene.cusize)*vspretest + .5; |
342 |
|
} else { |
343 |
< |
for (i = 0; i < 3; i++) |
295 |
< |
offsdir[i] = source[sn].sloc[i] - oc[i]; |
343 |
> |
VSUB(offsdir, source[sn].sloc, oc); |
344 |
|
d = DOT(offsdir,offsdir); |
345 |
|
if (d <= FTINY) |
346 |
|
n = 2.*PI * vspretest + .5; |
347 |
|
else |
348 |
|
n = 2.*PI * (1.-sqrt(1./(1.+or2/d)))*vspretest + .5; |
301 |
– |
infront = DOT(onorm, offsdir) > 0.; |
349 |
|
} |
350 |
|
if (n < MINSAMPLES) n = MINSAMPLES; |
351 |
|
#ifdef DEBUG |
357 |
|
stestlim = n*STESTMAX; |
358 |
|
ssn = 0; |
359 |
|
nhit = nok = 0; |
360 |
+ |
initsrcindex(&si); |
361 |
|
while (n-- > 0) { |
362 |
|
/* get sample point */ |
363 |
|
do { |
367 |
|
#endif |
368 |
|
return(f); /* too small a target! */ |
369 |
|
} |
370 |
+ |
multisamp(offsdir, 3, urand(sn*931+5827+ssn)); |
371 |
|
for (i = 0; i < 3; i++) |
372 |
< |
offsdir[i] = or*(1. - |
324 |
< |
2.*urand(urind(931*i+5827,ssn))); |
372 |
> |
offsdir[i] = or*(1. - 2.*offsdir[i]); |
373 |
|
ssn++; |
374 |
< |
for (i = 0; i < 3; i++) |
375 |
< |
sr.rorg[i] = oc[i] + offsdir[i]; |
376 |
< |
d = DOT(offsdir,onorm); |
377 |
< |
if (infront) |
378 |
< |
for (i = 0; i < 3; i++) { |
379 |
< |
sr.rorg[i] -= (d-.0001)*onorm[i]; |
380 |
< |
sr.rdir[i] = -onorm[i]; |
333 |
< |
} |
334 |
< |
else |
335 |
< |
for (i = 0; i < 3; i++) { |
336 |
< |
sr.rorg[i] -= (d+.0001)*onorm[i]; |
337 |
< |
sr.rdir[i] = onorm[i]; |
338 |
< |
} |
339 |
< |
rayorigin(&sr, NULL, PRIMARY, 1.0); |
374 |
> |
d = 1. - DOT(offsdir, onorm); |
375 |
> |
for (i = 0; i < 3; i++) { |
376 |
> |
sr.rorg[i] = oc[i] + offsdir[i] + d*onorm[i]; |
377 |
> |
sr.rdir[i] = -onorm[i]; |
378 |
> |
} |
379 |
> |
sr.rmax = 0.0; |
380 |
> |
rayorigin(&sr, PRIMARY, NULL, NULL); |
381 |
|
} while (!(*ofun[o->otype].funp)(o, &sr)); |
382 |
|
/* check against source */ |
383 |
+ |
VCOPY(sr.rorg, sr.rop); /* starting from intersection */ |
384 |
|
samplendx++; |
385 |
< |
if (srcray(&sr, NULL, sn) == 0.) |
386 |
< |
continue; |
385 |
> |
if (si.sp >= si.np-1 || |
386 |
> |
!srcray(&sr, NULL, &si) || sr.rsrc != sn) { |
387 |
> |
si.sn = sn-1; /* reset index to our source */ |
388 |
> |
si.np = 0; |
389 |
> |
if (!srcray(&sr, NULL, &si) || sr.rsrc != sn) |
390 |
> |
continue; /* can't get there from here */ |
391 |
> |
} |
392 |
|
sr.revf = srcvalue; |
393 |
< |
rayvalue(&sr); |
394 |
< |
if (bright(sr.rcol) <= FTINY) |
393 |
> |
rayvalue(&sr); /* check sample validity */ |
394 |
> |
if ((d = bright(sr.rcol)) <= FTINY) |
395 |
|
continue; |
396 |
< |
nok++; |
350 |
< |
/* check against obstructions */ |
396 |
> |
nok++; /* got sample; check obstructions */ |
397 |
|
rayclear(&sr); |
398 |
|
sr.revf = raytrace; |
399 |
|
rayvalue(&sr); |
400 |
< |
if (bright(sr.rcol) > FTINY) |
400 |
> |
if ((d1 = bright(sr.rcol)) > FTINY) { |
401 |
> |
if (d - d1 > FTINY) { |
402 |
> |
#ifdef DEBUG |
403 |
> |
fprintf(stderr, "\tpartially shadowed\n"); |
404 |
> |
#endif |
405 |
> |
return(f); /* intervening transmitter */ |
406 |
> |
} |
407 |
|
nhit++; |
408 |
+ |
} |
409 |
|
if (nhit > 0 && nhit < nok) { |
410 |
|
#ifdef DEBUG |
411 |
|
fprintf(stderr, "\tpartially occluded\n"); |
427 |
|
|
428 |
|
|
429 |
|
#ifdef DEBUG |
430 |
< |
virtverb(sn, fp) /* print verbose description of virtual source */ |
431 |
< |
register int sn; |
432 |
< |
FILE *fp; |
430 |
> |
void |
431 |
> |
virtverb( /* print verbose description of virtual source */ |
432 |
> |
int sn, |
433 |
> |
FILE *fp |
434 |
> |
) |
435 |
|
{ |
381 |
– |
register int i; |
382 |
– |
|
436 |
|
fprintf(fp, "%s virtual source %d in %s %s\n", |
437 |
|
source[sn].sflags & SDISTANT ? "distant" : "local", |
438 |
|
sn, ofun[source[sn].so->otype].funame, |