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/* Copyright (c) 1991 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1992 Regents of the University of California */ |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
18 |
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#include "source.h" |
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|
21 |
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#include "random.h" |
22 |
– |
|
21 |
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/* |
22 |
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* Structures used by direct() |
23 |
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*/ |
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|
25 |
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typedef struct { |
26 |
+ |
int sno; /* source number */ |
27 |
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FVECT dir; /* source direction */ |
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COLOR coef; /* material coefficient */ |
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COLOR val; /* contribution */ |
30 |
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} CONTRIB; /* direct contribution */ |
31 |
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|
32 |
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typedef struct { |
33 |
< |
int sno; /* source number */ |
33 |
> |
int sndx; /* source index (to CONTRIB array) */ |
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float brt; /* brightness (for comparison) */ |
35 |
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} CNTPTR; /* contribution pointer */ |
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|
37 |
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static CONTRIB *srccnt; /* source contributions in direct() */ |
38 |
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static CNTPTR *cntord; /* source ordering in direct() */ |
39 |
+ |
static int maxcntr = 0; /* size of contribution arrays */ |
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|
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|
42 |
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marksources() /* find and mark source objects */ |
43 |
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{ |
44 |
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int foundsource = 0; |
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int i; |
46 |
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register OBJREC *o, *m; |
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register int ns; |
94 |
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source[ns].sflags |= SSKIP; |
95 |
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} |
96 |
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} |
97 |
+ |
if (!(source[ns].sflags & SSKIP)) |
98 |
+ |
foundsource++; |
99 |
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} |
100 |
< |
if (nsources <= 0) { |
100 |
> |
if (!foundsource) { |
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error(WARNING, "no light sources found"); |
102 |
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return; |
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} |
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markvirtuals(); /* find and add virtual sources */ |
105 |
< |
srccnt = (CONTRIB *)malloc(nsources*sizeof(CONTRIB)); |
106 |
< |
cntord = (CNTPTR *)malloc(nsources*sizeof(CNTPTR)); |
107 |
< |
if (srccnt == NULL || cntord == NULL) |
105 |
> |
/* allocate our contribution arrays */ |
106 |
> |
maxcntr = nsources + MAXSPART; /* start with this many */ |
107 |
> |
srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
108 |
> |
cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
109 |
> |
if (srccnt == NULL | cntord == NULL) |
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goto memerr; |
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return; |
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memerr: |
114 |
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} |
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|
116 |
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|
117 |
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double |
113 |
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srcray(sr, r, sn) /* send a ray to a source, return domega */ |
117 |
> |
srcray(sr, r, si) /* send a ray to a source, return domega */ |
118 |
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register RAY *sr; /* returned source ray */ |
119 |
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RAY *r; /* ray which hit object */ |
120 |
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register int sn; /* source number */ |
120 |
> |
SRCINDEX *si; /* source sample index */ |
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{ |
122 |
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double ddot; /* (distance times) cosine */ |
123 |
< |
FVECT vd; |
120 |
< |
double d; |
121 |
< |
register int i; |
122 |
> |
double d; /* distance to source */ |
123 |
> |
register SRCREC *srcp; |
124 |
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|
125 |
< |
if (source[sn].sflags & SSKIP) |
124 |
< |
return(0.0); /* skip this source */ |
125 |
> |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
126 |
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|
127 |
< |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
128 |
< |
|
129 |
< |
sr->rsrc = sn; /* remember source */ |
130 |
< |
/* get source direction */ |
131 |
< |
if (source[sn].sflags & SDISTANT) { |
132 |
< |
/* constant direction */ |
133 |
< |
VCOPY(sr->rdir, source[sn].sloc); |
133 |
< |
} else { /* compute direction */ |
134 |
< |
for (i = 0; i < 3; i++) |
135 |
< |
sr->rdir[i] = source[sn].sloc[i] - sr->rorg[i]; |
136 |
< |
|
137 |
< |
if (source[sn].sflags & SFLAT && |
138 |
< |
(ddot = -DOT(sr->rdir, source[sn].snorm)) <= FTINY) |
139 |
< |
return(0.0); /* behind surface! */ |
127 |
> |
while ((d = nextssamp(sr, si)) != 0.0) { |
128 |
> |
sr->rsrc = si->sn; /* remember source */ |
129 |
> |
srcp = source + si->sn; |
130 |
> |
if (srcp->sflags & SDISTANT) { |
131 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
132 |
> |
continue; |
133 |
> |
return(1); /* sample OK */ |
134 |
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} |
135 |
< |
if (dstrsrc > FTINY) { |
142 |
< |
/* distribute source direction */ |
143 |
< |
dimlist[ndims] = sn + 8831; |
144 |
< |
peano(vd, 3, urand(ilhash(dimlist,ndims+1)+samplendx), .01); |
145 |
< |
for (i = 0; i < 3; i++) |
146 |
< |
vd[i] = dstrsrc * source[sn].ss * (1. - 2.*vd[i]); |
147 |
< |
if (source[sn].sflags & SFLAT) { /* project offset */ |
148 |
< |
d = DOT(vd, source[sn].snorm); |
149 |
< |
for (i = 0; i < 3; i++) |
150 |
< |
vd[i] -= d * source[sn].snorm[i]; |
151 |
< |
} |
152 |
< |
for (i = 0; i < 3; i++) /* offset source direction */ |
153 |
< |
sr->rdir[i] += vd[i]; |
154 |
< |
/* normalize */ |
155 |
< |
d = normalize(sr->rdir); |
156 |
< |
|
157 |
< |
} else if (!(source[sn].sflags & SDISTANT)) |
158 |
< |
/* normalize direction */ |
159 |
< |
d = normalize(sr->rdir); |
160 |
< |
|
161 |
< |
if (source[sn].sflags & SDISTANT) { |
162 |
< |
if (source[sn].sflags & SSPOT) { /* check location */ |
163 |
< |
for (i = 0; i < 3; i++) |
164 |
< |
vd[i] = source[sn].sl.s->aim[i] - sr->rorg[i]; |
165 |
< |
d = DOT(sr->rdir,vd); |
166 |
< |
if (d <= FTINY) |
167 |
< |
return(0.0); |
168 |
< |
d = DOT(vd,vd) - d*d; |
169 |
< |
if (PI*d > source[sn].sl.s->siz) |
170 |
< |
return(0.0); |
171 |
< |
} |
172 |
< |
return(source[sn].ss2); /* domega constant */ |
173 |
< |
} |
174 |
< |
/* check direction */ |
175 |
< |
if (d == 0.0) |
176 |
< |
return(0.0); |
135 |
> |
/* local source */ |
136 |
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/* check proximity */ |
137 |
< |
if (source[sn].sflags & SPROX && |
138 |
< |
d > source[sn].sl.prox) |
180 |
< |
return(0.0); |
181 |
< |
/* compute dot product */ |
182 |
< |
if (source[sn].sflags & SFLAT) |
183 |
< |
ddot /= d; |
184 |
< |
else |
185 |
< |
ddot = 1.0; |
137 |
> |
if (srcp->sflags & SPROX && d > srcp->sl.prox) |
138 |
> |
continue; |
139 |
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/* check angle */ |
140 |
< |
if (source[sn].sflags & SSPOT) { |
141 |
< |
if (source[sn].sl.s->siz < 2.0*PI * |
142 |
< |
(1.0 + DOT(source[sn].sl.s->aim,sr->rdir))) |
143 |
< |
return(0.0); |
144 |
< |
d += source[sn].sl.s->flen; /* adjust length */ |
140 |
> |
if (srcp->sflags & SSPOT) { |
141 |
> |
if (spotout(sr, srcp->sl.s, 0)) |
142 |
> |
continue; |
143 |
> |
/* adjust solid angle */ |
144 |
> |
si->dom *= d*d; |
145 |
> |
d += srcp->sl.s->flen; |
146 |
> |
si->dom /= d*d; |
147 |
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} |
148 |
< |
/* compute domega */ |
149 |
< |
return(ddot*source[sn].ss2/(d*d)); |
148 |
> |
return(1); /* sample OK */ |
149 |
> |
} |
150 |
> |
return(0); /* no more samples */ |
151 |
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} |
152 |
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|
153 |
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|
203 |
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extern int (*trace)(); |
204 |
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extern double pow(); |
205 |
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register int sn; |
206 |
+ |
SRCINDEX si; |
207 |
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int nshadcheck, ncnts; |
208 |
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int nhits; |
209 |
< |
double dom, prob, ourthresh, hwt; |
209 |
> |
double prob, ourthresh, hwt; |
210 |
|
RAY sr; |
211 |
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/* NOTE: srccnt and cntord global so no recursion */ |
212 |
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if (nsources <= 0) |
213 |
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return; /* no sources?! */ |
257 |
– |
/* compute number to check */ |
258 |
– |
nshadcheck = pow((double)nsources, shadcert) + .5; |
259 |
– |
/* modify threshold */ |
260 |
– |
ourthresh = shadthresh / r->rweight; |
214 |
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/* potential contributions */ |
215 |
< |
for (sn = 0; sn < nsources; sn++) { |
216 |
< |
cntord[sn].sno = sn; |
217 |
< |
cntord[sn].brt = 0.0; |
218 |
< |
/* get source ray */ |
219 |
< |
if ((dom = srcray(&sr, r, sn)) == 0.0) |
220 |
< |
continue; |
221 |
< |
VCOPY(srccnt[sn].dir, sr.rdir); |
215 |
> |
initsrcindex(&si); |
216 |
> |
for (sn = 0; srcray(&sr, r, &si); sn++) { |
217 |
> |
if (sn >= maxcntr) { |
218 |
> |
maxcntr = sn + MAXSPART; |
219 |
> |
srccnt = (CONTRIB *)realloc((char *)srccnt, |
220 |
> |
maxcntr*sizeof(CONTRIB)); |
221 |
> |
cntord = (CNTPTR *)realloc((char *)cntord, |
222 |
> |
maxcntr*sizeof(CNTPTR)); |
223 |
> |
if (srccnt == NULL | cntord == NULL) |
224 |
> |
error(SYSTEM, "out of memory in direct"); |
225 |
> |
} |
226 |
> |
cntord[sn].sndx = sn; |
227 |
> |
srccnt[sn].sno = sr.rsrc; |
228 |
|
/* compute coefficient */ |
229 |
< |
(*f)(srccnt[sn].coef, p, srccnt[sn].dir, dom); |
229 |
> |
(*f)(srccnt[sn].coef, p, sr.rdir, si.dom); |
230 |
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cntord[sn].brt = bright(srccnt[sn].coef); |
231 |
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if (cntord[sn].brt <= 0.0) |
232 |
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continue; |
233 |
+ |
VCOPY(srccnt[sn].dir, sr.rdir); |
234 |
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/* compute potential */ |
235 |
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sr.revf = srcvalue; |
236 |
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rayvalue(&sr); |
239 |
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cntord[sn].brt = bright(srccnt[sn].val); |
240 |
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} |
241 |
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/* sort contributions */ |
242 |
< |
qsort(cntord, nsources, sizeof(CNTPTR), cntcmp); |
242 |
> |
qsort(cntord, sn, sizeof(CNTPTR), cntcmp); |
243 |
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{ /* find last */ |
244 |
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register int l, m; |
245 |
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|
246 |
< |
sn = 0; ncnts = l = nsources; |
246 |
> |
ncnts = l = sn; |
247 |
> |
sn = 0; |
248 |
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while ((m = (sn + ncnts) >> 1) != l) { |
249 |
|
if (cntord[m].brt > 0.0) |
250 |
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sn = m; |
253 |
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l = m; |
254 |
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} |
255 |
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} |
256 |
+ |
if (ncnts == 0) |
257 |
+ |
return; /* no contributions! */ |
258 |
|
/* accumulate tail */ |
259 |
|
for (sn = ncnts-1; sn > 0; sn--) |
260 |
|
cntord[sn-1].brt += cntord[sn].brt; |
261 |
+ |
/* compute number to check */ |
262 |
+ |
nshadcheck = pow((double)ncnts, shadcert) + .5; |
263 |
+ |
/* modify threshold */ |
264 |
+ |
ourthresh = shadthresh / r->rweight; |
265 |
|
/* test for shadows */ |
266 |
|
nhits = 0; |
267 |
|
for (sn = 0; sn < ncnts; sn++) { |
270 |
|
cntord[sn].brt-cntord[sn+nshadcheck].brt) |
271 |
|
< ourthresh*bright(r->rcol)) |
272 |
|
break; |
306 |
– |
/* get statistics */ |
307 |
– |
source[cntord[sn].sno].ntests++; |
273 |
|
/* test for hit */ |
274 |
|
rayorigin(&sr, r, SHADOW, 1.0); |
275 |
< |
VCOPY(sr.rdir, srccnt[cntord[sn].sno].dir); |
276 |
< |
sr.rsrc = cntord[sn].sno; |
275 |
> |
VCOPY(sr.rdir, srccnt[cntord[sn].sndx].dir); |
276 |
> |
sr.rsrc = srccnt[cntord[sn].sndx].sno; |
277 |
> |
source[sr.rsrc].ntests++; /* keep statistics */ |
278 |
|
if (localhit(&sr, &thescene) && |
279 |
< |
( sr.ro != source[cntord[sn].sno].so || |
280 |
< |
source[cntord[sn].sno].sflags & SFOLLOW )) { |
279 |
> |
( sr.ro != source[sr.rsrc].so || |
280 |
> |
source[sr.rsrc].sflags & SFOLLOW )) { |
281 |
|
/* follow entire path */ |
282 |
|
raycont(&sr); |
283 |
|
if (trace != NULL) |
284 |
|
(*trace)(&sr); /* trace execution */ |
285 |
|
if (bright(sr.rcol) <= FTINY) |
286 |
|
continue; /* missed! */ |
287 |
< |
copycolor(srccnt[cntord[sn].sno].val, sr.rcol); |
288 |
< |
multcolor(srccnt[cntord[sn].sno].val, |
289 |
< |
srccnt[cntord[sn].sno].coef); |
287 |
> |
copycolor(srccnt[cntord[sn].sndx].val, sr.rcol); |
288 |
> |
multcolor(srccnt[cntord[sn].sndx].val, |
289 |
> |
srccnt[cntord[sn].sndx].coef); |
290 |
|
} |
291 |
|
/* add contribution if hit */ |
292 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
292 |
> |
addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
293 |
|
nhits++; |
294 |
< |
source[cntord[sn].sno].nhits++; |
294 |
> |
source[sr.rsrc].nhits++; |
295 |
|
} |
296 |
|
/* surface hit rate */ |
297 |
|
if (sn > 0) |
305 |
|
#endif |
306 |
|
/* add in untested sources */ |
307 |
|
for ( ; sn < ncnts; sn++) { |
308 |
< |
prob = hwt * (double)source[cntord[sn].sno].nhits / |
309 |
< |
(double)source[cntord[sn].sno].ntests; |
310 |
< |
scalecolor(srccnt[cntord[sn].sno].val, prob); |
311 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
308 |
> |
sr.rsrc = srccnt[cntord[sn].sndx].sno; |
309 |
> |
prob = hwt * (double)source[sr.rsrc].nhits / |
310 |
> |
(double)source[sr.rsrc].ntests; |
311 |
> |
scalecolor(srccnt[cntord[sn].sndx].val, prob); |
312 |
> |
addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
313 |
|
} |
314 |
+ |
} |
315 |
+ |
|
316 |
+ |
|
317 |
+ |
/**************************************************************** |
318 |
+ |
* The following macros were separated from the m_light() routine |
319 |
+ |
* because they are very nasty and difficult to understand. |
320 |
+ |
*/ |
321 |
+ |
|
322 |
+ |
/* wrongillum * |
323 |
+ |
* |
324 |
+ |
* We cannot allow an illum to pass to another illum, because that |
325 |
+ |
* would almost certainly constitute overcounting. |
326 |
+ |
* However, we do allow an illum to pass to another illum |
327 |
+ |
* that is actually going to relay to a virtual light source. |
328 |
+ |
*/ |
329 |
+ |
|
330 |
+ |
#define wrongillum(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
331 |
+ |
objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM) |
332 |
+ |
|
333 |
+ |
/* wrongsource * |
334 |
+ |
* |
335 |
+ |
* This source is the wrong source (ie. overcounted) if we are |
336 |
+ |
* aimed to a different source than the one we hit and the one |
337 |
+ |
* we hit is not an illum which should be passed. |
338 |
+ |
*/ |
339 |
+ |
|
340 |
+ |
#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
341 |
+ |
(m->otype!=MAT_ILLUM || wrongillum(m,r))) |
342 |
+ |
|
343 |
+ |
/* distglow * |
344 |
+ |
* |
345 |
+ |
* A distant glow is an object that sometimes acts as a light source, |
346 |
+ |
* but is too far away from the test point to be one in this case. |
347 |
+ |
*/ |
348 |
+ |
|
349 |
+ |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
350 |
+ |
r->rot > m->oargs.farg[3]) |
351 |
+ |
|
352 |
+ |
/* badcomponent * |
353 |
+ |
* |
354 |
+ |
* We must avoid counting light sources in the ambient calculation, |
355 |
+ |
* since the direct component is handled separately. Therefore, any |
356 |
+ |
* ambient ray which hits an active light source must be discarded. |
357 |
+ |
* The same is true for stray specular samples, since the specular |
358 |
+ |
* contribution from light sources is calculated separately. |
359 |
+ |
*/ |
360 |
+ |
|
361 |
+ |
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
362 |
+ |
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
363 |
+ |
distglow(m, r))) |
364 |
+ |
|
365 |
+ |
/* overcount * |
366 |
+ |
* |
367 |
+ |
* All overcounting possibilities are contained here. |
368 |
+ |
*/ |
369 |
+ |
|
370 |
+ |
#define overcount(m, r) (badcomponent(m,r) || wrongsource(m,r)) |
371 |
+ |
|
372 |
+ |
/* passillum * |
373 |
+ |
* |
374 |
+ |
* An illum passes to another material type when we didn't hit it |
375 |
+ |
* on purpose (as part of a direct calculation), or it is relaying |
376 |
+ |
* a virtual light source. |
377 |
+ |
*/ |
378 |
+ |
|
379 |
+ |
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
380 |
+ |
(r->rsrc<0 || source[r->rsrc].so!=r->ro || \ |
381 |
+ |
source[r->rsrc].sflags&SVIRTUAL)) |
382 |
+ |
|
383 |
+ |
/* srcignore * |
384 |
+ |
* |
385 |
+ |
* The -di flag renders light sources invisible, and here is the test. |
386 |
+ |
*/ |
387 |
+ |
|
388 |
+ |
#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
389 |
+ |
!distglow(m, r)) |
390 |
+ |
|
391 |
+ |
|
392 |
+ |
m_light(m, r) /* ray hit a light source */ |
393 |
+ |
register OBJREC *m; |
394 |
+ |
register RAY *r; |
395 |
+ |
{ |
396 |
+ |
/* check for over-counting */ |
397 |
+ |
if (overcount(m, r)) |
398 |
+ |
return; |
399 |
+ |
/* check for passed illum */ |
400 |
+ |
if (passillum(m, r)) { |
401 |
+ |
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
402 |
+ |
raytrans(r); |
403 |
+ |
else |
404 |
+ |
rayshade(r, modifier(m->oargs.sarg[0])); |
405 |
+ |
return; |
406 |
+ |
} |
407 |
+ |
/* otherwise treat as source */ |
408 |
+ |
/* check for behind */ |
409 |
+ |
if (r->rod < 0.0) |
410 |
+ |
return; |
411 |
+ |
/* check for invisibility */ |
412 |
+ |
if (srcignore(m, r)) |
413 |
+ |
return; |
414 |
+ |
/* check for outside spot */ |
415 |
+ |
if (m->otype==MAT_SPOT && spotout(r, (SPOT *)m->os, r->rot>=FHUGE)) |
416 |
+ |
return; |
417 |
+ |
/* get distribution pattern */ |
418 |
+ |
raytexture(r, m->omod); |
419 |
+ |
/* get source color */ |
420 |
+ |
setcolor(r->rcol, m->oargs.farg[0], |
421 |
+ |
m->oargs.farg[1], |
422 |
+ |
m->oargs.farg[2]); |
423 |
+ |
/* modify value */ |
424 |
+ |
multcolor(r->rcol, r->pcol); |
425 |
|
} |