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#include "random.h" |
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#define DISKTFRAC 0.25 /* disk area pretest fraction */ |
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double getdisk(); |
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static OBJECT *vobject; /* virtual source objects */ |
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register int sn; |
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MAT4 pm; |
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{ |
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FVECT nsloc, nsnorm, ocent; |
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double maxrad2; |
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FVECT nsloc, nsnorm, ocent, v; |
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double maxrad2, d; |
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int nsflags; |
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double d1; |
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SPOT theirspot, ourspot; |
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register int i; |
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if (source[sn].sflags & SSPOT) { |
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copystruct(&theirspot, source[sn].sl.s); |
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multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
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d = ourspot.siz; |
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if (!commonbeam(&ourspot, &theirspot, nsloc)) |
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return(-1); /* no overlap */ |
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return(-1); /* no overlap */ |
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if (ourspot.siz < d-FTINY) { /* it shrunk */ |
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d = beamdisk(v, op, &ourspot, nsloc); |
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if (d <= FTINY) |
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return(-1); |
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if (d < maxrad2) { |
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maxrad2 = d; |
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VCOPY(ocent, v); |
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} |
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} |
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} |
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} else { /* local source */ |
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multp3(nsloc, source[sn].sloc, pm); |
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for (i = 0; i < 3; i++) |
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ourspot.aim[i] = ocent[i] - nsloc[i]; |
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if ((d1 = normalize(ourspot.aim)) == 0.) |
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if ((d = normalize(ourspot.aim)) == 0.) |
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return(-1); /* at source!! */ |
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if (source[sn].sflags & SPROX && d1 > source[sn].sl.prox) |
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if (source[sn].sflags & SPROX && d > source[sn].sl.prox) |
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return(-1); /* too far away */ |
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ourspot.siz = 2.*PI*(1. - d1/sqrt(d1*d1+maxrad2)); |
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ourspot.siz = 2.*PI*(1. - d/sqrt(d*d+maxrad2)); |
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ourspot.flen = 0.; |
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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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d = ourspot.siz; |
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if (!commonspot(&ourspot, &theirspot, nsloc)) |
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return(-1); /* no overlap */ |
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if (ourspot.siz < d-FTINY) { /* it shrunk */ |
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d = spotdisk(v, op, &ourspot, nsloc); |
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if (d <= FTINY) |
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return(-1); |
173 |
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if (d < maxrad2) { |
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maxrad2 = d; |
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VCOPY(ocent, v); |
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} |
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} |
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ourspot.flen = theirspot.flen; |
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} |
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if (source[sn].sflags & SFLAT) { /* behind source? */ |
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multv3(nsnorm, source[sn].snorm, pm); |
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if (checkspot(&ourspot, nsnorm) < 0) |
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if (!checkspot(&ourspot, nsnorm)) |
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return(-1); |
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} |
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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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> |
rad2 = getmaxdisk(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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> |
roffs = getplaneq(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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if ((d > 0.) ^ (rd > 0.)) |
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return(rad2); /* OK if opposite sides */ |
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if (d*d >= rad2) |
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return(.0); /* no relay is possible */ |
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return(0.); /* no relay is possible */ |
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/* we need a closer look */ |
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< |
offs = (*sfun[op->otype].of->getpleq)(nrm, op); |
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> |
offs = getplaneq(nrm, op); |
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rdoto = DOT(rnrm, nrm); |
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if (d*d >= rad2*(1.-rdoto*rdoto)) |
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return(0.); /* disk entirely on projection side */ |
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FVECT onorm; |
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FVECT offsdir; |
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double or, d; |
255 |
< |
int nok, nhit; |
255 |
> |
int infront; |
256 |
> |
int ssn; |
257 |
> |
int nhit, nok; |
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register int i, n; |
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/* return if pretesting disabled */ |
260 |
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if (vspretest <= 0) |
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return(f); |
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/* get surface normal */ |
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< |
(*sfun[o->otype].of->getpleq)(onorm, o); |
263 |
> |
getplaneq(onorm, o); |
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/* set number of rays to sample */ |
265 |
< |
if (source[sn].sflags & SDISTANT) |
265 |
> |
if (source[sn].sflags & SDISTANT) { |
266 |
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n = (2./3.*PI*PI)*or2/(thescene.cusize*thescene.cusize)* |
267 |
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vspretest + .5; |
268 |
< |
else |
269 |
< |
n = or2/dist2(oc,source[sn].sloc)*vspretest + .5; |
268 |
> |
infront = DOT(onorm, source[sn].sloc) > 0.; |
269 |
> |
} else { |
270 |
> |
for (i = 0; i < 3; i++) |
271 |
> |
offsdir[i] = source[sn].sloc[i] - oc[i]; |
272 |
> |
n = or2/DOT(offsdir,offsdir)*vspretest + .5; |
273 |
> |
infront = DOT(onorm, offsdir) > 0.; |
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> |
} |
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if (n < 1) n = 1; |
276 |
< |
/* limit tests to central region */ |
277 |
< |
or = DISKTFRAC*sqrt(or2); |
276 |
> |
#ifdef DEBUG |
277 |
> |
fprintf(stderr, "pretesting source %d in object %s with %d rays\n", |
278 |
> |
sn, o->oname, n); |
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> |
#endif |
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/* sample */ |
281 |
+ |
or = sqrt(or2); |
282 |
+ |
ssn = 25*n; |
283 |
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nhit = nok = 0; |
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while (n-- > 0) { |
285 |
< |
samplendx++; |
286 |
< |
/* |
287 |
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* We're being real sloppy with our sample locations here. |
288 |
< |
*/ |
289 |
< |
for (i = 0; i < 3; i++) |
290 |
< |
offsdir[i] = or*(1. - 2.*urand(931*i+5821+n)); |
291 |
< |
d = DOT(offsdir,onorm); |
292 |
< |
for (i = 0; i < 3; i++) |
293 |
< |
sr.rorg[i] = oc[i] + (1.-d)*offsdir[i]; |
285 |
> |
/* get sample point */ |
286 |
> |
do { |
287 |
> |
if (--ssn < 0) { |
288 |
> |
#ifdef DEBUG |
289 |
> |
fprintf(stderr, "\ttoo hard to hit\n"); |
290 |
> |
#endif |
291 |
> |
return(f); /* too small a target! */ |
292 |
> |
} |
293 |
> |
for (i = 0; i < 3; i++) |
294 |
> |
offsdir[i] = or*(1. - |
295 |
> |
2.*urand(931*i+5827+ssn)); |
296 |
> |
for (i = 0; i < 3; i++) |
297 |
> |
sr.rorg[i] = oc[i] + offsdir[i]; |
298 |
> |
d = DOT(offsdir,onorm); |
299 |
> |
if (infront) |
300 |
> |
for (i = 0; i < 3; i++) { |
301 |
> |
sr.rorg[i] -= (d-.0001)*onorm[i]; |
302 |
> |
sr.rdir[i] = -onorm[i]; |
303 |
> |
} |
304 |
> |
else |
305 |
> |
for (i = 0; i < 3; i++) { |
306 |
> |
sr.rorg[i] -= (d+.0001)*onorm[i]; |
307 |
> |
sr.rdir[i] = onorm[i]; |
308 |
> |
} |
309 |
> |
rayorigin(&sr, NULL, PRIMARY, 1.0); |
310 |
> |
} while (!(*ofun[o->otype].funp)(o, &sr)); |
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/* check against source */ |
312 |
< |
if (srcray(&sr, NULL, sn) == 0.0) |
312 |
> |
samplendx++; |
313 |
> |
if (srcray(&sr, NULL, sn) == 0.) |
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continue; |
315 |
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sr.revf = srcvalue; |
316 |
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rayvalue(&sr); |
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/* check against obstructions */ |
321 |
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srcray(&sr, NULL, sn); |
322 |
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rayvalue(&sr); |
323 |
< |
if (bright(sr.rcol) <= FTINY) |
324 |
< |
continue; |
325 |
< |
nhit++; |
323 |
> |
if (bright(sr.rcol) > FTINY) |
324 |
> |
nhit++; |
325 |
> |
if (nhit > 0 && nhit < nok) { |
326 |
> |
#ifdef DEBUG |
327 |
> |
fprintf(stderr, "\tpartially occluded\n"); |
328 |
> |
#endif |
329 |
> |
return(f); /* need to shadow test */ |
330 |
> |
} |
331 |
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} |
332 |
< |
/* interpret results */ |
333 |
< |
if (nhit == 0) |
332 |
> |
if (nhit == 0) { |
333 |
> |
#ifdef DEBUG |
334 |
> |
fprintf(stderr, "\t0%% hit rate\n"); |
335 |
> |
#endif |
336 |
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return(f | SSKIP); /* 0% hit rate: totally occluded */ |
337 |
< |
if (nhit == nok) |
338 |
< |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
339 |
< |
return(f); /* no comment */ |
337 |
> |
} |
338 |
> |
#ifdef DEBUG |
339 |
> |
fprintf(stderr, "\t100%% hit rate\n"); |
340 |
> |
#endif |
341 |
> |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
342 |
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} |
343 |
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