1 |
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/* Copyright (c) 1991 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1995 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"; |
41 |
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|
42 |
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marksources() /* find and mark source objects */ |
43 |
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{ |
44 |
+ |
int foundsource = 0; |
45 |
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int i; |
46 |
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register OBJREC *o, *m; |
47 |
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register int ns; |
68 |
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o->otype != OBJ_SOURCE && |
69 |
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m->oargs.farg[3] <= FTINY) |
70 |
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continue; /* don't bother */ |
71 |
+ |
if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY && |
72 |
+ |
m->oargs.farg[2] <= FTINY) |
73 |
+ |
continue; /* don't bother */ |
74 |
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|
75 |
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if (sfun[o->otype].of == NULL || |
76 |
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sfun[o->otype].of->setsrc == NULL) |
84 |
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if (m->otype == MAT_GLOW) { |
85 |
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source[ns].sflags |= SPROX; |
86 |
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source[ns].sl.prox = m->oargs.farg[3]; |
87 |
< |
if (o->otype == OBJ_SOURCE) |
87 |
> |
if (source[ns].sflags & SDISTANT) |
88 |
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source[ns].sflags |= SSKIP; |
89 |
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} else if (m->otype == MAT_SPOT) { |
90 |
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source[ns].sflags |= SSPOT; |
97 |
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source[ns].sflags |= SSKIP; |
98 |
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} |
99 |
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} |
100 |
+ |
if (!(source[ns].sflags & SSKIP)) |
101 |
+ |
foundsource++; |
102 |
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} |
103 |
< |
if (nsources <= 0) { |
103 |
> |
if (!foundsource) { |
104 |
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error(WARNING, "no light sources found"); |
105 |
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return; |
106 |
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} |
123 |
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SRCINDEX *si; /* source sample index */ |
124 |
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{ |
125 |
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double d; /* distance to source */ |
120 |
– |
FVECT vd; |
126 |
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register SRCREC *srcp; |
122 |
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register int i; |
127 |
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|
128 |
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rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
129 |
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|
131 |
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sr->rsrc = si->sn; /* remember source */ |
132 |
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srcp = source + si->sn; |
133 |
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if (srcp->sflags & SDISTANT) { |
134 |
< |
if (srcp->sflags & SSPOT) { /* check location */ |
135 |
< |
for (i = 0; i < 3; i++) |
132 |
< |
vd[i] = srcp->sl.s->aim[i] - sr->rorg[i]; |
133 |
< |
d = DOT(sr->rdir,vd); |
134 |
< |
if (d <= FTINY) |
135 |
< |
continue; |
136 |
< |
d = DOT(vd,vd) - d*d; |
137 |
< |
if (PI*d > srcp->sl.s->siz) |
138 |
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continue; |
139 |
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} |
134 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
135 |
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continue; |
136 |
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return(1); /* sample OK */ |
137 |
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} |
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/* local source */ |
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continue; |
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/* check angle */ |
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if (srcp->sflags & SSPOT) { |
144 |
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if (srcp->sl.s->siz < 2.0*PI * |
149 |
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(1.0 + DOT(srcp->sl.s->aim,sr->rdir))) |
144 |
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if (spotout(sr, srcp->sl.s)) |
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continue; |
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/* adjust solid angle */ |
147 |
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si->dom *= d*d; |
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|
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|
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srcvalue(r) /* punch ray to source and compute value */ |
158 |
< |
RAY *r; |
158 |
> |
register RAY *r; |
159 |
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{ |
160 |
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register SRCREC *sp; |
161 |
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|
164 |
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/* check intersection */ |
165 |
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if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
166 |
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return; |
167 |
< |
raycont(r); /* compute contribution */ |
167 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
168 |
> |
goto nomat; |
169 |
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return; |
170 |
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} |
171 |
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/* compute intersection */ |
173 |
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(*ofun[sp->so->otype].funp)(sp->so, r)) { |
174 |
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if (sp->sa.success >= 0) |
175 |
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sp->sa.success++; |
176 |
< |
raycont(r); /* compute contribution */ |
176 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
177 |
> |
goto nomat; |
178 |
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return; |
179 |
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} |
180 |
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/* we missed our mark! */ |
181 |
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if (sp->sa.success < 0) |
182 |
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return; /* bitched already */ |
183 |
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sp->sa.success -= AIMREQT; |
186 |
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sprintf(errmsg, "aiming failure for light source \"%s\"", |
187 |
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sp->so->oname); |
188 |
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error(WARNING, errmsg); /* issue warning */ |
189 |
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return; |
190 |
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nomat: |
191 |
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objerror(r->ro, USER, "material not found"); |
192 |
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} |
193 |
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|
194 |
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|
195 |
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sourcehit(r) /* check to see if ray hit distant source */ |
196 |
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register RAY *r; |
197 |
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{ |
198 |
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int first, last; |
199 |
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register int i; |
200 |
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|
201 |
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if (r->rsrc >= 0) { /* check only one if aimed */ |
202 |
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first = last = r->rsrc; |
203 |
+ |
} else { /* otherwise check all */ |
204 |
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first = 0; last = nsources-1; |
205 |
+ |
} |
206 |
+ |
for (i = first; i <= last; i++) |
207 |
+ |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
208 |
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/* |
209 |
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* Check to see if ray is within |
210 |
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* solid angle of source. |
211 |
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*/ |
212 |
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if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
213 |
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<= source[i].ss2) { |
214 |
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r->ro = source[i].so; |
215 |
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if (!(source[i].sflags & SSKIP)) |
216 |
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break; |
217 |
+ |
} |
218 |
+ |
|
219 |
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if (r->ro != NULL) { |
220 |
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for (i = 0; i < 3; i++) |
221 |
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r->ron[i] = -r->rdir[i]; |
222 |
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r->rod = 1.0; |
223 |
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r->rox = NULL; |
224 |
+ |
return(1); |
225 |
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} |
226 |
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return(0); |
227 |
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} |
228 |
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|
229 |
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|
230 |
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static int |
231 |
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cntcmp(sc1, sc2) /* contribution compare (descending) */ |
232 |
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register CNTPTR *sc1, *sc2; |
245 |
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char *p; /* data for f */ |
246 |
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{ |
247 |
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extern int (*trace)(); |
212 |
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extern double pow(); |
248 |
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register int sn; |
249 |
+ |
register CONTRIB *scp; |
250 |
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SRCINDEX si; |
251 |
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int nshadcheck, ncnts; |
252 |
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int nhits; |
268 |
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error(SYSTEM, "out of memory in direct"); |
269 |
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} |
270 |
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cntord[sn].sndx = sn; |
271 |
< |
srccnt[sn].sno = sr.rsrc; |
271 |
> |
scp = srccnt + sn; |
272 |
> |
scp->sno = sr.rsrc; |
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/* compute coefficient */ |
274 |
< |
(*f)(srccnt[sn].coef, p, sr.rdir, si.dom); |
275 |
< |
cntord[sn].brt = bright(srccnt[sn].coef); |
274 |
> |
(*f)(scp->coef, p, sr.rdir, si.dom); |
275 |
> |
cntord[sn].brt = bright(scp->coef); |
276 |
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if (cntord[sn].brt <= 0.0) |
277 |
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continue; |
278 |
< |
VCOPY(srccnt[sn].dir, sr.rdir); |
278 |
> |
VCOPY(scp->dir, sr.rdir); |
279 |
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/* compute potential */ |
280 |
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sr.revf = srcvalue; |
281 |
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rayvalue(&sr); |
282 |
< |
copycolor(srccnt[sn].val, sr.rcol); |
283 |
< |
multcolor(srccnt[sn].val, srccnt[sn].coef); |
284 |
< |
cntord[sn].brt = bright(srccnt[sn].val); |
282 |
> |
copycolor(scp->val, sr.rcol); |
283 |
> |
multcolor(scp->val, scp->coef); |
284 |
> |
cntord[sn].brt = bright(scp->val); |
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} |
286 |
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/* sort contributions */ |
287 |
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qsort(cntord, sn, sizeof(CNTPTR), cntcmp); |
298 |
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l = m; |
299 |
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} |
300 |
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} |
301 |
+ |
if (ncnts == 0) |
302 |
+ |
return; /* no contributions! */ |
303 |
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/* accumulate tail */ |
304 |
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for (sn = ncnts-1; sn > 0; sn--) |
305 |
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cntord[sn-1].brt += cntord[sn].brt; |
308 |
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/* modify threshold */ |
309 |
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ourthresh = shadthresh / r->rweight; |
310 |
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/* test for shadows */ |
311 |
< |
nhits = 0; |
312 |
< |
for (sn = 0; sn < ncnts; sn++) { |
311 |
> |
for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts; |
312 |
> |
hwt += (double)source[scp->sno].nhits / |
313 |
> |
(double)source[scp->sno].ntests, |
314 |
> |
sn++) { |
315 |
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/* check threshold */ |
316 |
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if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
317 |
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cntord[sn].brt-cntord[sn+nshadcheck].brt) |
318 |
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< ourthresh*bright(r->rcol)) |
319 |
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break; |
320 |
+ |
scp = srccnt + cntord[sn].sndx; |
321 |
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/* test for hit */ |
322 |
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rayorigin(&sr, r, SHADOW, 1.0); |
323 |
< |
VCOPY(sr.rdir, srccnt[cntord[sn].sndx].dir); |
324 |
< |
sr.rsrc = srccnt[cntord[sn].sndx].sno; |
325 |
< |
source[sr.rsrc].ntests++; /* keep statistics */ |
323 |
> |
VCOPY(sr.rdir, scp->dir); |
324 |
> |
sr.rsrc = scp->sno; |
325 |
> |
source[scp->sno].ntests++; /* keep statistics */ |
326 |
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if (localhit(&sr, &thescene) && |
327 |
< |
( sr.ro != source[sr.rsrc].so || |
328 |
< |
source[sr.rsrc].sflags & SFOLLOW )) { |
327 |
> |
( sr.ro != source[scp->sno].so || |
328 |
> |
source[scp->sno].sflags & SFOLLOW )) { |
329 |
|
/* follow entire path */ |
330 |
< |
raycont(&sr); |
330 |
> |
if (!raycont(&sr)) |
331 |
> |
objerror(sr.ro, USER, "material not found"); |
332 |
|
if (trace != NULL) |
333 |
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(*trace)(&sr); /* trace execution */ |
334 |
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if (bright(sr.rcol) <= FTINY) |
335 |
|
continue; /* missed! */ |
336 |
< |
copycolor(srccnt[cntord[sn].sndx].val, sr.rcol); |
337 |
< |
multcolor(srccnt[cntord[sn].sndx].val, |
295 |
< |
srccnt[cntord[sn].sndx].coef); |
336 |
> |
copycolor(scp->val, sr.rcol); |
337 |
> |
multcolor(scp->val, scp->coef); |
338 |
|
} |
339 |
|
/* add contribution if hit */ |
340 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
340 |
> |
addcolor(r->rcol, scp->val); |
341 |
|
nhits++; |
342 |
< |
source[sr.rsrc].nhits++; |
342 |
> |
source[scp->sno].nhits++; |
343 |
|
} |
344 |
< |
/* surface hit rate */ |
345 |
< |
if (sn > 0) |
346 |
< |
hwt = (double)nhits / (double)sn; |
344 |
> |
/* source hit rate */ |
345 |
> |
if (hwt > FTINY) |
346 |
> |
hwt = (double)nhits / hwt; |
347 |
|
else |
348 |
|
hwt = 0.5; |
349 |
|
#ifdef DEBUG |
350 |
< |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
350 |
> |
sprintf(errmsg, "%d tested, %d untested, %f conditional hit rate\n", |
351 |
|
sn, ncnts-sn, hwt); |
352 |
|
eputs(errmsg); |
353 |
|
#endif |
354 |
|
/* add in untested sources */ |
355 |
|
for ( ; sn < ncnts; sn++) { |
356 |
< |
sr.rsrc = srccnt[cntord[sn].sndx].sno; |
357 |
< |
prob = hwt * (double)source[sr.rsrc].nhits / |
358 |
< |
(double)source[sr.rsrc].ntests; |
359 |
< |
scalecolor(srccnt[cntord[sn].sndx].val, prob); |
360 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
356 |
> |
scp = srccnt + cntord[sn].sndx; |
357 |
> |
prob = hwt * (double)source[scp->sno].nhits / |
358 |
> |
(double)source[scp->sno].ntests; |
359 |
> |
if (prob > 1.0) |
360 |
> |
prob = 1.0; |
361 |
> |
scalecolor(scp->val, prob); |
362 |
> |
addcolor(r->rcol, scp->val); |
363 |
|
} |
364 |
+ |
} |
365 |
+ |
|
366 |
+ |
|
367 |
+ |
/**************************************************************** |
368 |
+ |
* The following macros were separated from the m_light() routine |
369 |
+ |
* because they are very nasty and difficult to understand. |
370 |
+ |
*/ |
371 |
+ |
|
372 |
+ |
/* illumblock * |
373 |
+ |
* |
374 |
+ |
* We cannot allow an illum to pass to another illum, because that |
375 |
+ |
* would almost certainly constitute overcounting. |
376 |
+ |
* However, we do allow an illum to pass to another illum |
377 |
+ |
* that is actually going to relay to a virtual light source. |
378 |
+ |
* We also prevent an illum from passing to a glow; this provides a |
379 |
+ |
* convenient mechanism for defining detailed light source |
380 |
+ |
* geometry behind (or inside) an effective radiator. |
381 |
+ |
*/ |
382 |
+ |
|
383 |
+ |
static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
384 |
+ |
{register OBJREC *o = objptr(obj); |
385 |
+ |
return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
386 |
+ |
|
387 |
+ |
#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
388 |
+ |
r->rod > 0.0 && \ |
389 |
+ |
weaksrcmod(source[r->rsrc].so->omod)) |
390 |
+ |
|
391 |
+ |
/* wrongsource * |
392 |
+ |
* |
393 |
+ |
* This source is the wrong source (ie. overcounted) if we are |
394 |
+ |
* aimed to a different source than the one we hit and the one |
395 |
+ |
* we hit is not an illum that should be passed. |
396 |
+ |
*/ |
397 |
+ |
|
398 |
+ |
#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
399 |
+ |
(m->otype!=MAT_ILLUM || illumblock(m,r))) |
400 |
+ |
|
401 |
+ |
/* distglow * |
402 |
+ |
* |
403 |
+ |
* A distant glow is an object that sometimes acts as a light source, |
404 |
+ |
* but is too far away from the test point to be one in this case. |
405 |
+ |
* (Glows with negative radii should NEVER participate in illumination.) |
406 |
+ |
*/ |
407 |
+ |
|
408 |
+ |
#define distglow(m, r, d) (m->otype==MAT_GLOW && \ |
409 |
+ |
m->oargs.farg[3] >= -FTINY && \ |
410 |
+ |
d > m->oargs.farg[3]) |
411 |
+ |
|
412 |
+ |
/* badcomponent * |
413 |
+ |
* |
414 |
+ |
* We must avoid counting light sources in the ambient calculation, |
415 |
+ |
* since the direct component is handled separately. Therefore, any |
416 |
+ |
* ambient ray which hits an active light source must be discarded. |
417 |
+ |
* The same is true for stray specular samples, since the specular |
418 |
+ |
* contribution from light sources is calculated separately. |
419 |
+ |
*/ |
420 |
+ |
|
421 |
+ |
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
422 |
+ |
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
423 |
+ |
/* not 100% correct */ distglow(m, r, r->rot))) |
424 |
+ |
|
425 |
+ |
/* passillum * |
426 |
+ |
* |
427 |
+ |
* An illum passes to another material type when we didn't hit it |
428 |
+ |
* on purpose (as part of a direct calculation), or it is relaying |
429 |
+ |
* a virtual light source. |
430 |
+ |
*/ |
431 |
+ |
|
432 |
+ |
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
433 |
+ |
(r->rsrc<0 || source[r->rsrc].so!=r->ro || \ |
434 |
+ |
source[r->rsrc].sflags&SVIRTUAL)) |
435 |
+ |
|
436 |
+ |
/* srcignore * |
437 |
+ |
* |
438 |
+ |
* The -dv flag is normally on for sources to be visible. |
439 |
+ |
*/ |
440 |
+ |
|
441 |
+ |
#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
442 |
+ |
distglow(m, r, raydist(r,PRIMARY))) |
443 |
+ |
|
444 |
+ |
|
445 |
+ |
m_light(m, r) /* ray hit a light source */ |
446 |
+ |
register OBJREC *m; |
447 |
+ |
register RAY *r; |
448 |
+ |
{ |
449 |
+ |
/* check for over-counting */ |
450 |
+ |
if (badcomponent(m, r)) |
451 |
+ |
return(1); |
452 |
+ |
if (wrongsource(m, r)) |
453 |
+ |
return(1); |
454 |
+ |
/* check for passed illum */ |
455 |
+ |
if (passillum(m, r)) { |
456 |
+ |
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
457 |
+ |
return(rayshade(r, modifier(m->oargs.sarg[0]))); |
458 |
+ |
raytrans(r); |
459 |
+ |
return(1); |
460 |
+ |
} |
461 |
+ |
/* otherwise treat as source */ |
462 |
+ |
/* check for behind */ |
463 |
+ |
if (r->rod < 0.0) |
464 |
+ |
return(1); |
465 |
+ |
/* check for invisibility */ |
466 |
+ |
if (srcignore(m, r)) |
467 |
+ |
return(1); |
468 |
+ |
/* check for outside spot */ |
469 |
+ |
if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |
470 |
+ |
return(1); |
471 |
+ |
/* get distribution pattern */ |
472 |
+ |
raytexture(r, m->omod); |
473 |
+ |
/* get source color */ |
474 |
+ |
setcolor(r->rcol, m->oargs.farg[0], |
475 |
+ |
m->oargs.farg[1], |
476 |
+ |
m->oargs.farg[2]); |
477 |
+ |
/* modify value */ |
478 |
+ |
multcolor(r->rcol, r->pcol); |
479 |
+ |
return(1); |
480 |
|
} |