1 |
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/* Copyright (c) 1993 Regents of the University of California */ |
2 |
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|
1 |
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#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
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#endif |
6 |
– |
|
4 |
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/* |
5 |
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* source.c - routines dealing with illumination sources. |
6 |
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* |
7 |
< |
* 8/20/85 |
7 |
> |
* External symbols declared in source.h |
8 |
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*/ |
9 |
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|
10 |
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#include "ray.h" |
14 |
– |
|
15 |
– |
#include "octree.h" |
16 |
– |
|
11 |
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#include "otypes.h" |
12 |
< |
|
12 |
> |
#include "rtotypes.h" |
13 |
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#include "source.h" |
14 |
+ |
#include "random.h" |
15 |
+ |
#include "pmapsrc.h" |
16 |
+ |
#include "pmapmat.h" |
17 |
|
|
18 |
+ |
#ifndef MAXSSAMP |
19 |
+ |
#define MAXSSAMP 16 /* maximum samples per ray */ |
20 |
+ |
#endif |
21 |
+ |
|
22 |
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/* |
23 |
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* Structures used by direct() |
24 |
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*/ |
39 |
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static CNTPTR *cntord; /* source ordering in direct() */ |
40 |
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static int maxcntr = 0; /* size of contribution arrays */ |
41 |
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|
42 |
+ |
static int cntcmp(const void *p1, const void *p2); |
43 |
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|
44 |
< |
marksources() /* find and mark source objects */ |
44 |
> |
|
45 |
> |
OBJREC * /* find an object's actual material */ |
46 |
> |
findmaterial(OBJREC *o) |
47 |
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{ |
48 |
+ |
while (!ismaterial(o->otype)) { |
49 |
+ |
if (o->otype == MOD_ALIAS && o->oargs.nsargs) { |
50 |
+ |
OBJECT aobj; |
51 |
+ |
OBJREC *ao; |
52 |
+ |
aobj = lastmod(objndx(o), o->oargs.sarg[0]); |
53 |
+ |
if (aobj < 0) |
54 |
+ |
objerror(o, USER, "bad reference"); |
55 |
+ |
/* recursive check on alias branch */ |
56 |
+ |
if ((ao = findmaterial(objptr(aobj))) != NULL) |
57 |
+ |
return(ao); |
58 |
+ |
} |
59 |
+ |
if (o->omod == OVOID) |
60 |
+ |
return(NULL); |
61 |
+ |
o = objptr(o->omod); |
62 |
+ |
} |
63 |
+ |
return(o); /* mixtures will return NULL */ |
64 |
+ |
} |
65 |
+ |
|
66 |
+ |
|
67 |
+ |
void |
68 |
+ |
marksources(void) /* find and mark source objects */ |
69 |
+ |
{ |
70 |
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int foundsource = 0; |
71 |
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int i; |
72 |
< |
register OBJREC *o, *m; |
73 |
< |
register int ns; |
72 |
> |
OBJREC *o, *m; |
73 |
> |
int ns; |
74 |
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/* initialize dispatch table */ |
75 |
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initstypes(); |
76 |
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/* find direct sources */ |
77 |
< |
for (i = 0; i < nobjects; i++) { |
77 |
> |
for (i = 0; i < nsceneobjs; i++) { |
78 |
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|
79 |
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o = objptr(i); |
80 |
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|
81 |
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if (!issurface(o->otype) || o->omod == OVOID) |
82 |
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continue; |
83 |
< |
|
84 |
< |
m = objptr(o->omod); |
85 |
< |
|
60 |
< |
if (!islight(m->otype)) |
83 |
> |
/* find material */ |
84 |
> |
m = findmaterial(objptr(o->omod)); |
85 |
> |
if (m == NULL) |
86 |
|
continue; |
87 |
+ |
if (m->otype == MAT_CLIP) { |
88 |
+ |
markclip(m); /* special case for antimatter */ |
89 |
+ |
continue; |
90 |
+ |
} |
91 |
+ |
if (!islight(m->otype)) |
92 |
+ |
continue; /* not source modifier */ |
93 |
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|
94 |
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if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 : |
95 |
|
m->otype == MAT_SPOT ? 7 : 3)) |
96 |
|
objerror(m, USER, "bad # arguments"); |
97 |
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|
98 |
+ |
if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY && |
99 |
+ |
m->oargs.farg[2] <= FTINY) |
100 |
+ |
continue; /* don't bother */ |
101 |
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if (m->otype == MAT_GLOW && |
102 |
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o->otype != OBJ_SOURCE && |
103 |
< |
m->oargs.farg[3] <= FTINY) |
104 |
< |
continue; /* don't bother */ |
105 |
< |
|
103 |
> |
m->oargs.farg[3] <= FTINY) { |
104 |
> |
foundsource += (ambounce > 0); |
105 |
> |
continue; /* don't track these */ |
106 |
> |
} |
107 |
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if (sfun[o->otype].of == NULL || |
108 |
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sfun[o->otype].of->setsrc == NULL) |
109 |
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objerror(o, USER, "illegal material"); |
116 |
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if (m->otype == MAT_GLOW) { |
117 |
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source[ns].sflags |= SPROX; |
118 |
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source[ns].sl.prox = m->oargs.farg[3]; |
119 |
< |
if (source[ns].sflags & SDISTANT) |
119 |
> |
if (source[ns].sflags & SDISTANT) { |
120 |
|
source[ns].sflags |= SSKIP; |
121 |
+ |
foundsource += (ambounce > 0); |
122 |
+ |
} |
123 |
|
} else if (m->otype == MAT_SPOT) { |
124 |
|
source[ns].sflags |= SSPOT; |
125 |
|
if ((source[ns].sl.s = makespot(m)) == NULL) |
131 |
|
source[ns].sflags |= SSKIP; |
132 |
|
} |
133 |
|
} |
134 |
< |
if (!(source[ns].sflags & SSKIP)) |
98 |
< |
foundsource++; |
134 |
> |
foundsource += !(source[ns].sflags & SSKIP); |
135 |
|
} |
136 |
|
if (!foundsource) { |
137 |
|
error(WARNING, "no light sources found"); |
138 |
|
return; |
139 |
|
} |
140 |
< |
markvirtuals(); /* find and add virtual sources */ |
140 |
> |
#if SHADCACHE |
141 |
> |
for (ns = 0; ns < nsources; ns++) /* initialize obstructor cache */ |
142 |
> |
initobscache(ns); |
143 |
> |
#endif |
144 |
> |
/* PMAP: disable virtual sources */ |
145 |
> |
if (!photonMapping) |
146 |
> |
markvirtuals(); /* find and add virtual sources */ |
147 |
> |
|
148 |
|
/* allocate our contribution arrays */ |
149 |
|
maxcntr = nsources + MAXSPART; /* start with this many */ |
150 |
|
srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
151 |
|
cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
152 |
< |
if (srccnt == NULL | cntord == NULL) |
152 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
153 |
|
goto memerr; |
154 |
|
return; |
155 |
|
memerr: |
157 |
|
} |
158 |
|
|
159 |
|
|
160 |
< |
srcray(sr, r, si) /* send a ray to a source, return domega */ |
161 |
< |
register RAY *sr; /* returned source ray */ |
119 |
< |
RAY *r; /* ray which hit object */ |
120 |
< |
SRCINDEX *si; /* source sample index */ |
160 |
> |
void |
161 |
> |
freesources(void) /* free all source structures */ |
162 |
|
{ |
163 |
< |
double d; /* distance to source */ |
164 |
< |
register SRCREC *srcp; |
163 |
> |
if (nsources > 0) { |
164 |
> |
#if SHADCACHE |
165 |
> |
while (nsources--) |
166 |
> |
freeobscache(&source[nsources]); |
167 |
> |
#endif |
168 |
> |
free((void *)source); |
169 |
> |
source = NULL; |
170 |
> |
nsources = 0; |
171 |
> |
} |
172 |
> |
markclip(NULL); |
173 |
> |
if (maxcntr <= 0) |
174 |
> |
return; |
175 |
> |
free((void *)srccnt); |
176 |
> |
srccnt = NULL; |
177 |
> |
free((void *)cntord); |
178 |
> |
cntord = NULL; |
179 |
> |
maxcntr = 0; |
180 |
> |
} |
181 |
|
|
125 |
– |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
182 |
|
|
183 |
< |
while ((d = nextssamp(sr, si)) != 0.0) { |
184 |
< |
sr->rsrc = si->sn; /* remember source */ |
185 |
< |
srcp = source + si->sn; |
186 |
< |
if (srcp->sflags & SDISTANT) { |
187 |
< |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
188 |
< |
continue; |
189 |
< |
return(1); /* sample OK */ |
190 |
< |
} |
183 |
> |
int |
184 |
> |
srcray( /* send a ray to a source, return domega */ |
185 |
> |
RAY *sr, /* returned source ray */ |
186 |
> |
RAY *r, /* ray which hit object */ |
187 |
> |
SRCINDEX *si /* source sample index */ |
188 |
> |
) |
189 |
> |
{ |
190 |
> |
double d; /* distance to source */ |
191 |
> |
SRCREC *srcp; |
192 |
> |
|
193 |
> |
rayorigin(sr, SHADOW, r, NULL); /* ignore limits */ |
194 |
> |
|
195 |
> |
if (r == NULL) |
196 |
> |
sr->rmax = 0.0; |
197 |
> |
|
198 |
> |
while ((d = nextssamp(sr, si)) != 0.0) { |
199 |
> |
sr->rsrc = si->sn; /* remember source */ |
200 |
> |
srcp = source + si->sn; |
201 |
> |
if (srcp->sflags & SDISTANT) { |
202 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
203 |
> |
continue; |
204 |
> |
return(1); /* sample OK */ |
205 |
> |
} |
206 |
|
/* local source */ |
207 |
|
/* check proximity */ |
208 |
< |
if (srcp->sflags & SPROX && d > srcp->sl.prox) |
138 |
< |
continue; |
139 |
< |
/* check angle */ |
140 |
< |
if (srcp->sflags & SSPOT) { |
141 |
< |
if (spotout(sr, srcp->sl.s, 0)) |
208 |
> |
if (srcp->sflags & SPROX && d > srcp->sl.prox) |
209 |
|
continue; |
210 |
+ |
/* check angle */ |
211 |
+ |
if (srcp->sflags & SSPOT) { |
212 |
+ |
if (spotout(sr, srcp->sl.s)) |
213 |
+ |
continue; |
214 |
|
/* adjust solid angle */ |
215 |
< |
si->dom *= d*d; |
216 |
< |
d += srcp->sl.s->flen; |
217 |
< |
si->dom /= d*d; |
215 |
> |
si->dom *= d*d; |
216 |
> |
d += srcp->sl.s->flen; |
217 |
> |
si->dom /= d*d; |
218 |
> |
} |
219 |
> |
return(1); /* sample OK */ |
220 |
|
} |
221 |
< |
return(1); /* sample OK */ |
149 |
< |
} |
150 |
< |
return(0); /* no more samples */ |
221 |
> |
return(0); /* no more samples */ |
222 |
|
} |
223 |
|
|
224 |
|
|
225 |
< |
srcvalue(r) /* punch ray to source and compute value */ |
226 |
< |
register RAY *r; |
225 |
> |
void |
226 |
> |
srcvalue( /* punch ray to source and compute value */ |
227 |
> |
RAY *r |
228 |
> |
) |
229 |
|
{ |
230 |
< |
register SRCREC *sp; |
230 |
> |
SRCREC *sp; |
231 |
|
|
232 |
|
sp = &source[r->rsrc]; |
233 |
|
if (sp->sflags & SVIRTUAL) { /* virtual source */ |
236 |
|
return; |
237 |
|
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
238 |
|
goto nomat; |
239 |
+ |
rayparticipate(r); |
240 |
|
return; |
241 |
|
} |
242 |
|
/* compute intersection */ |
246 |
|
sp->sa.success++; |
247 |
|
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
248 |
|
goto nomat; |
249 |
+ |
rayparticipate(r); |
250 |
|
return; |
251 |
|
} |
252 |
|
/* we missed our mark! */ |
264 |
|
} |
265 |
|
|
266 |
|
|
267 |
< |
sourcehit(r) /* check to see if ray hit distant source */ |
268 |
< |
register RAY *r; |
267 |
> |
static int |
268 |
> |
transillum( /* check if material is transparent illum */ |
269 |
> |
OBJECT obj |
270 |
> |
) |
271 |
|
{ |
272 |
+ |
OBJREC *m = findmaterial(objptr(obj)); |
273 |
+ |
|
274 |
+ |
if (m == NULL) |
275 |
+ |
return(1); |
276 |
+ |
if (m->otype != MAT_ILLUM) |
277 |
+ |
return(0); |
278 |
+ |
return(!m->oargs.nsargs || !strcmp(m->oargs.sarg[0], VOIDID)); |
279 |
+ |
} |
280 |
+ |
|
281 |
+ |
|
282 |
+ |
int |
283 |
+ |
sourcehit( /* check to see if ray hit distant source */ |
284 |
+ |
RAY *r |
285 |
+ |
) |
286 |
+ |
{ |
287 |
+ |
int glowsrc = -1; |
288 |
+ |
int transrc = -1; |
289 |
|
int first, last; |
290 |
< |
register int i; |
290 |
> |
int i; |
291 |
|
|
292 |
|
if (r->rsrc >= 0) { /* check only one if aimed */ |
293 |
|
first = last = r->rsrc; |
294 |
|
} else { /* otherwise check all */ |
295 |
|
first = 0; last = nsources-1; |
296 |
|
} |
297 |
< |
for (i = first; i <= last; i++) |
298 |
< |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
299 |
< |
/* |
300 |
< |
* Check to see if ray is within |
301 |
< |
* solid angle of source. |
302 |
< |
*/ |
303 |
< |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
304 |
< |
<= source[i].ss2) { |
305 |
< |
r->ro = source[i].so; |
306 |
< |
if (!(source[i].sflags & SSKIP)) |
307 |
< |
break; |
308 |
< |
} |
309 |
< |
|
310 |
< |
if (r->ro != NULL) { |
311 |
< |
for (i = 0; i < 3; i++) |
312 |
< |
r->ron[i] = -r->rdir[i]; |
313 |
< |
r->rod = 1.0; |
314 |
< |
r->rox = NULL; |
315 |
< |
return(1); |
297 |
> |
for (i = first; i <= last; i++) { |
298 |
> |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) != SDISTANT) |
299 |
> |
continue; |
300 |
> |
/* |
301 |
> |
* Check to see if ray is within |
302 |
> |
* solid angle of source. |
303 |
> |
*/ |
304 |
> |
if (2.*PI*(1. - DOT(source[i].sloc,r->rdir)) > source[i].ss2) |
305 |
> |
continue; |
306 |
> |
/* is it the only possibility? */ |
307 |
> |
if (first == last) { |
308 |
> |
r->ro = source[i].so; |
309 |
> |
break; |
310 |
> |
} |
311 |
> |
/* |
312 |
> |
* If it's a glow or transparent illum, just remember it. |
313 |
> |
*/ |
314 |
> |
if (source[i].sflags & SSKIP) { |
315 |
> |
if (glowsrc < 0) |
316 |
> |
glowsrc = i; |
317 |
> |
continue; |
318 |
> |
} |
319 |
> |
if (transillum(source[i].so->omod)) { |
320 |
> |
if (transrc < 0) |
321 |
> |
transrc = i; |
322 |
> |
continue; |
323 |
> |
} |
324 |
> |
r->ro = source[i].so; /* otherwise, use first hit */ |
325 |
> |
break; |
326 |
|
} |
327 |
< |
return(0); |
327 |
> |
/* |
328 |
> |
* Do we need fallback? |
329 |
> |
*/ |
330 |
> |
if (r->ro == NULL) { |
331 |
> |
if (transrc >= 0 && r->crtype & (AMBIENT|SPECULAR)) |
332 |
> |
return(0); /* avoid overcounting */ |
333 |
> |
if (glowsrc >= 0) |
334 |
> |
r->ro = source[glowsrc].so; |
335 |
> |
else |
336 |
> |
return(0); /* nothing usable */ |
337 |
> |
} |
338 |
> |
/* |
339 |
> |
* Make assignments. |
340 |
> |
*/ |
341 |
> |
r->robj = objndx(r->ro); |
342 |
> |
for (i = 0; i < 3; i++) |
343 |
> |
r->ron[i] = -r->rdir[i]; |
344 |
> |
r->rod = 1.0; |
345 |
> |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
346 |
> |
r->uv[0] = r->uv[1] = 0.0; |
347 |
> |
r->rox = NULL; |
348 |
> |
return(1); |
349 |
|
} |
350 |
|
|
351 |
|
|
352 |
|
static int |
353 |
< |
cntcmp(sc1, sc2) /* contribution compare (descending) */ |
354 |
< |
register CNTPTR *sc1, *sc2; |
353 |
> |
cntcmp( /* contribution compare (descending) */ |
354 |
> |
const void *p1, |
355 |
> |
const void *p2 |
356 |
> |
) |
357 |
|
{ |
358 |
+ |
const CNTPTR *sc1 = (const CNTPTR *)p1; |
359 |
+ |
const CNTPTR *sc2 = (const CNTPTR *)p2; |
360 |
+ |
|
361 |
|
if (sc1->brt > sc2->brt) |
362 |
|
return(-1); |
363 |
|
if (sc1->brt < sc2->brt) |
366 |
|
} |
367 |
|
|
368 |
|
|
369 |
< |
direct(r, f, p) /* add direct component */ |
370 |
< |
RAY *r; /* ray that hit surface */ |
371 |
< |
int (*f)(); /* direct component coefficient function */ |
372 |
< |
char *p; /* data for f */ |
369 |
> |
void |
370 |
> |
direct( /* add direct component */ |
371 |
> |
RAY *r, /* ray that hit surface */ |
372 |
> |
srcdirf_t *f, /* direct component coefficient function */ |
373 |
> |
void *p /* data for f */ |
374 |
> |
) |
375 |
|
{ |
376 |
< |
extern int (*trace)(); |
377 |
< |
register int sn; |
246 |
< |
register CONTRIB *scp; |
376 |
> |
int sn; |
377 |
> |
CONTRIB *scp; |
378 |
|
SRCINDEX si; |
379 |
|
int nshadcheck, ncnts; |
380 |
|
int nhits; |
381 |
|
double prob, ourthresh, hwt; |
382 |
|
RAY sr; |
383 |
+ |
|
384 |
+ |
/* PMAP: Factor in direct photons (primarily for debugging/validation) */ |
385 |
+ |
if (directPhotonMapping) { |
386 |
+ |
(*f)(r -> rcol, p, r -> ron, PI); |
387 |
+ |
multDirectPmap(r); |
388 |
+ |
return; |
389 |
+ |
} |
390 |
+ |
|
391 |
|
/* NOTE: srccnt and cntord global so no recursion */ |
392 |
|
if (nsources <= 0) |
393 |
|
return; /* no sources?! */ |
396 |
|
for (sn = 0; srcray(&sr, r, &si); sn++) { |
397 |
|
if (sn >= maxcntr) { |
398 |
|
maxcntr = sn + MAXSPART; |
399 |
< |
srccnt = (CONTRIB *)realloc((char *)srccnt, |
399 |
> |
srccnt = (CONTRIB *)realloc((void *)srccnt, |
400 |
|
maxcntr*sizeof(CONTRIB)); |
401 |
< |
cntord = (CNTPTR *)realloc((char *)cntord, |
401 |
> |
cntord = (CNTPTR *)realloc((void *)cntord, |
402 |
|
maxcntr*sizeof(CNTPTR)); |
403 |
< |
if (srccnt == NULL | cntord == NULL) |
403 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
404 |
|
error(SYSTEM, "out of memory in direct"); |
405 |
|
} |
406 |
|
cntord[sn].sndx = sn; |
408 |
|
scp->sno = sr.rsrc; |
409 |
|
/* compute coefficient */ |
410 |
|
(*f)(scp->coef, p, sr.rdir, si.dom); |
411 |
< |
cntord[sn].brt = bright(scp->coef); |
411 |
> |
cntord[sn].brt = intens(scp->coef); |
412 |
|
if (cntord[sn].brt <= 0.0) |
413 |
|
continue; |
414 |
+ |
#if SHADCACHE |
415 |
+ |
/* check shadow cache */ |
416 |
+ |
if (si.np == 1 && srcblocked(&sr)) { |
417 |
+ |
cntord[sn].brt = 0.0; |
418 |
+ |
continue; |
419 |
+ |
} |
420 |
+ |
#endif |
421 |
|
VCOPY(scp->dir, sr.rdir); |
422 |
+ |
copycolor(sr.rcoef, scp->coef); |
423 |
|
/* compute potential */ |
424 |
|
sr.revf = srcvalue; |
425 |
|
rayvalue(&sr); |
426 |
+ |
multcolor(sr.rcol, sr.rcoef); |
427 |
|
copycolor(scp->val, sr.rcol); |
428 |
< |
multcolor(scp->val, scp->coef); |
281 |
< |
cntord[sn].brt = bright(scp->val); |
428 |
> |
cntord[sn].brt = bright(sr.rcol); |
429 |
|
} |
430 |
|
/* sort contributions */ |
431 |
|
qsort(cntord, sn, sizeof(CNTPTR), cntcmp); |
432 |
|
{ /* find last */ |
433 |
< |
register int l, m; |
433 |
> |
int l, m; |
434 |
|
|
435 |
|
ncnts = l = sn; |
436 |
|
sn = 0; |
450 |
|
/* compute number to check */ |
451 |
|
nshadcheck = pow((double)ncnts, shadcert) + .5; |
452 |
|
/* modify threshold */ |
453 |
< |
ourthresh = shadthresh / r->rweight; |
453 |
> |
if (ncnts > MINSHADCNT) |
454 |
> |
ourthresh = shadthresh / r->rweight; |
455 |
> |
else |
456 |
> |
ourthresh = 0; |
457 |
|
/* test for shadows */ |
458 |
|
for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts; |
459 |
|
hwt += (double)source[scp->sno].nhits / |
466 |
|
break; |
467 |
|
scp = srccnt + cntord[sn].sndx; |
468 |
|
/* test for hit */ |
469 |
< |
rayorigin(&sr, r, SHADOW, 1.0); |
469 |
> |
rayorigin(&sr, SHADOW, r, NULL); |
470 |
> |
copycolor(sr.rcoef, scp->coef); |
471 |
|
VCOPY(sr.rdir, scp->dir); |
472 |
|
sr.rsrc = scp->sno; |
473 |
< |
source[scp->sno].ntests++; /* keep statistics */ |
473 |
> |
/* keep statistics */ |
474 |
> |
if (source[scp->sno].ntests++ > 0xfffffff0) { |
475 |
> |
source[scp->sno].ntests >>= 1; |
476 |
> |
source[scp->sno].nhits >>= 1; |
477 |
> |
} |
478 |
|
if (localhit(&sr, &thescene) && |
479 |
|
( sr.ro != source[scp->sno].so || |
480 |
|
source[scp->sno].sflags & SFOLLOW )) { |
481 |
|
/* follow entire path */ |
482 |
< |
if (!raycont(&sr)) |
328 |
< |
objerror(sr.ro, USER, "material not found"); |
482 |
> |
raycont(&sr); |
483 |
|
if (trace != NULL) |
484 |
|
(*trace)(&sr); /* trace execution */ |
485 |
< |
if (bright(sr.rcol) <= FTINY) |
485 |
> |
if (bright(sr.rcol) <= FTINY) { |
486 |
> |
#if SHADCACHE |
487 |
> |
if ((scp <= srccnt || scp[-1].sno != scp->sno) |
488 |
> |
&& (scp >= srccnt+ncnts-1 || |
489 |
> |
scp[1].sno != scp->sno)) |
490 |
> |
srcblocker(&sr); |
491 |
> |
#endif |
492 |
|
continue; /* missed! */ |
493 |
+ |
} |
494 |
+ |
rayparticipate(&sr); |
495 |
+ |
multcolor(sr.rcol, sr.rcoef); |
496 |
|
copycolor(scp->val, sr.rcol); |
497 |
< |
multcolor(scp->val, scp->coef); |
497 |
> |
} else if (trace != NULL && |
498 |
> |
(source[scp->sno].sflags & (SDISTANT|SVIRTUAL|SFOLLOW)) |
499 |
> |
== (SDISTANT|SFOLLOW) && |
500 |
> |
sourcehit(&sr) && rayshade(&sr, sr.ro->omod)) { |
501 |
> |
(*trace)(&sr); /* trace execution */ |
502 |
> |
/* skip call to rayparticipate() & scp->val update */ |
503 |
|
} |
504 |
|
/* add contribution if hit */ |
505 |
|
addcolor(r->rcol, scp->val); |
521 |
|
scp = srccnt + cntord[sn].sndx; |
522 |
|
prob = hwt * (double)source[scp->sno].nhits / |
523 |
|
(double)source[scp->sno].ntests; |
524 |
< |
if (prob > 1.0) |
525 |
< |
prob = 1.0; |
358 |
< |
scalecolor(scp->val, prob); |
524 |
> |
if (prob < 1.0) |
525 |
> |
scalecolor(scp->val, prob); |
526 |
|
addcolor(r->rcol, scp->val); |
527 |
|
} |
528 |
|
} |
529 |
|
|
530 |
|
|
531 |
+ |
void |
532 |
+ |
srcscatter( /* compute source scattering into ray */ |
533 |
+ |
RAY *r |
534 |
+ |
) |
535 |
+ |
{ |
536 |
+ |
int oldsampndx; |
537 |
+ |
int nsamps; |
538 |
+ |
RAY sr; |
539 |
+ |
SRCINDEX si; |
540 |
+ |
double t, d; |
541 |
+ |
double re, ge, be; |
542 |
+ |
COLOR cvext; |
543 |
+ |
int i, j; |
544 |
+ |
|
545 |
+ |
if (r->rot >= FHUGE || r->gecc >= 1.-FTINY) |
546 |
+ |
return; /* this can never work */ |
547 |
+ |
/* PMAP: do unconditional inscattering for volume photons */ |
548 |
+ |
if (!volumePhotonMapping && (r->slights == NULL || r->slights[0] == 0)) |
549 |
+ |
return; |
550 |
+ |
|
551 |
+ |
if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) |
552 |
+ |
nsamps = 1; |
553 |
+ |
#if MAXSSAMP |
554 |
+ |
else if (nsamps > MAXSSAMP) |
555 |
+ |
nsamps = MAXSSAMP; |
556 |
+ |
#endif |
557 |
+ |
oldsampndx = samplendx; |
558 |
+ |
samplendx = random()&0x7fff; /* randomize */ |
559 |
+ |
for (i = volumePhotonMapping ? 1 : r->slights[0]; i > 0; i--) { |
560 |
+ |
/* for each source OR once if volume photon map enabled */ |
561 |
+ |
for (j = 0; j < nsamps; j++) { /* for each sample position */ |
562 |
+ |
samplendx++; |
563 |
+ |
t = r->rot * (j+frandom())/nsamps; |
564 |
+ |
/* extinction */ |
565 |
+ |
re = t*colval(r->cext,RED); |
566 |
+ |
ge = t*colval(r->cext,GRN); |
567 |
+ |
be = t*colval(r->cext,BLU); |
568 |
+ |
setcolor(cvext, re > 92. ? 0. : exp(-re), |
569 |
+ |
ge > 92. ? 0. : exp(-ge), |
570 |
+ |
be > 92. ? 0. : exp(-be)); |
571 |
+ |
if (intens(cvext) <= FTINY) |
572 |
+ |
break; /* too far away */ |
573 |
+ |
sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
574 |
+ |
sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
575 |
+ |
sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
576 |
+ |
|
577 |
+ |
if (!volumePhotonMapping) { |
578 |
+ |
initsrcindex(&si); /* sample ray to this source */ |
579 |
+ |
si.sn = r->slights[i]; |
580 |
+ |
nopart(&si, &sr); |
581 |
+ |
if (!srcray(&sr, NULL, &si) || |
582 |
+ |
sr.rsrc != r->slights[i]) |
583 |
+ |
continue; /* no path */ |
584 |
+ |
#if SHADCACHE |
585 |
+ |
if (srcblocked(&sr)) /* check shadow cache */ |
586 |
+ |
continue; |
587 |
+ |
#endif |
588 |
+ |
copycolor(sr.cext, r->cext); |
589 |
+ |
copycolor(sr.albedo, r->albedo); |
590 |
+ |
sr.gecc = r->gecc; |
591 |
+ |
sr.slights = r->slights; |
592 |
+ |
rayvalue(&sr); /* eval. source ray */ |
593 |
+ |
if (bright(sr.rcol) <= FTINY) { |
594 |
+ |
#if SHADCACHE |
595 |
+ |
srcblocker(&sr); /* add blocker to cache */ |
596 |
+ |
#endif |
597 |
+ |
continue; |
598 |
+ |
} |
599 |
+ |
if (r->gecc <= FTINY) /* compute P(theta) */ |
600 |
+ |
d = 1.; |
601 |
+ |
else { |
602 |
+ |
d = DOT(r->rdir, sr.rdir); |
603 |
+ |
d = 1. + r->gecc*r->gecc - 2.*r->gecc*d; |
604 |
+ |
d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); |
605 |
+ |
} |
606 |
+ |
/* other factors */ |
607 |
+ |
d *= si.dom * r->rot / (4.*PI*nsamps); |
608 |
+ |
scalecolor(sr.rcol, d); |
609 |
+ |
} else { |
610 |
+ |
/* PMAP: Add ambient inscattering from |
611 |
+ |
* volume photons; note we reverse the |
612 |
+ |
* incident ray direction since we're |
613 |
+ |
* now in *backward* raytracing mode! */ |
614 |
+ |
sr.rdir [0] = -r -> rdir [0]; |
615 |
+ |
sr.rdir [1] = -r -> rdir [1]; |
616 |
+ |
sr.rdir [2] = -r -> rdir [2]; |
617 |
+ |
sr.gecc = r -> gecc; |
618 |
+ |
inscatterVolumePmap(&sr, sr.rcol); |
619 |
+ |
scalecolor(sr.rcol, r -> rot / nsamps); |
620 |
+ |
} |
621 |
+ |
multcolor(sr.rcol, r->cext); |
622 |
+ |
multcolor(sr.rcol, r->albedo); |
623 |
+ |
multcolor(sr.rcol, cvext); |
624 |
+ |
addcolor(r->rcol, sr.rcol); /* add it in */ |
625 |
+ |
} |
626 |
+ |
} |
627 |
+ |
samplendx = oldsampndx; |
628 |
+ |
} |
629 |
+ |
|
630 |
+ |
|
631 |
|
/**************************************************************** |
632 |
|
* The following macros were separated from the m_light() routine |
633 |
|
* because they are very nasty and difficult to understand. |
644 |
|
* geometry behind (or inside) an effective radiator. |
645 |
|
*/ |
646 |
|
|
647 |
< |
static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
648 |
< |
{register OBJREC *o = objptr(obj); |
649 |
< |
return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
647 |
> |
static int |
648 |
> |
weaksrcmat(OBJECT obj) /* identify material */ |
649 |
> |
{ |
650 |
> |
OBJREC *m = findmaterial(objptr(obj)); |
651 |
> |
|
652 |
> |
if (m == NULL) return(0); |
653 |
> |
return((m->otype==MAT_ILLUM) | (m->otype==MAT_GLOW)); |
654 |
> |
} |
655 |
|
|
656 |
|
#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
657 |
|
r->rod > 0.0 && \ |
658 |
< |
weaksrcmod(source[r->rsrc].so->omod)) |
658 |
> |
weaksrcmat(source[r->rsrc].so->omod)) |
659 |
|
|
660 |
|
/* wrongsource * |
661 |
|
* |
674 |
|
* (Glows with negative radii should NEVER participate in illumination.) |
675 |
|
*/ |
676 |
|
|
677 |
< |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
677 |
> |
#define distglow(m, r, d) (m->otype==MAT_GLOW && \ |
678 |
|
m->oargs.farg[3] >= -FTINY && \ |
679 |
< |
r->rot > m->oargs.farg[3]) |
679 |
> |
d > m->oargs.farg[3]) |
680 |
|
|
681 |
|
/* badcomponent * |
682 |
|
* |
686 |
|
* The same is true for stray specular samples, since the specular |
687 |
|
* contribution from light sources is calculated separately. |
688 |
|
*/ |
689 |
< |
|
690 |
< |
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
689 |
> |
/* PMAP: Also avoid counting sources via transferred ambient rays (e.g. |
690 |
> |
* through glass) when photon mapping is enabled, as these indirect |
691 |
> |
* components are already accounted for. |
692 |
> |
*/ |
693 |
> |
#define badcomponent(m, r) (srcRayInPmap(r) || \ |
694 |
> |
(r->crtype&(AMBIENT|SPECULAR) && \ |
695 |
|
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
696 |
< |
distglow(m, r))) |
696 |
> |
/* not 100% correct */ distglow(m, r, r->rot)))) |
697 |
|
|
698 |
|
/* passillum * |
699 |
|
* |
711 |
|
* The -dv flag is normally on for sources to be visible. |
712 |
|
*/ |
713 |
|
|
714 |
< |
#define srcignore(m, r) (!directvis && !(r->crtype&SHADOW) && \ |
715 |
< |
!distglow(m, r)) |
714 |
> |
#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
715 |
> |
distglow(m, r, raydist(r,PRIMARY))) |
716 |
|
|
717 |
|
|
718 |
< |
m_light(m, r) /* ray hit a light source */ |
719 |
< |
register OBJREC *m; |
720 |
< |
register RAY *r; |
718 |
> |
int |
719 |
> |
m_light( /* ray hit a light source */ |
720 |
> |
OBJREC *m, |
721 |
> |
RAY *r |
722 |
> |
) |
723 |
|
{ |
724 |
|
/* check for over-counting */ |
725 |
< |
if (badcomponent(m, r)) |
725 |
> |
if (badcomponent(m, r)) { |
726 |
> |
setcolor(r->rcoef, 0.0, 0.0, 0.0); |
727 |
|
return(1); |
728 |
< |
if (wrongsource(m,r)) |
728 |
> |
} |
729 |
> |
if (wrongsource(m, r)) { |
730 |
> |
setcolor(r->rcoef, 0.0, 0.0, 0.0); |
731 |
|
return(1); |
732 |
+ |
} |
733 |
|
/* check for passed illum */ |
734 |
|
if (passillum(m, r)) { |
735 |
|
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
736 |
< |
return(rayshade(r, modifier(m->oargs.sarg[0]))); |
736 |
> |
return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); |
737 |
|
raytrans(r); |
738 |
|
return(1); |
739 |
|
} |
740 |
+ |
/* check for invisibility */ |
741 |
+ |
if (srcignore(m, r)) { |
742 |
+ |
setcolor(r->rcoef, 0.0, 0.0, 0.0); |
743 |
+ |
return(1); |
744 |
+ |
} |
745 |
|
/* otherwise treat as source */ |
746 |
|
/* check for behind */ |
747 |
|
if (r->rod < 0.0) |
748 |
|
return(1); |
462 |
– |
/* check for invisibility */ |
463 |
– |
if (srcignore(m, r)) |
464 |
– |
return(1); |
749 |
|
/* check for outside spot */ |
750 |
< |
if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) |
750 |
> |
if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |
751 |
|
return(1); |
752 |
|
/* get distribution pattern */ |
753 |
|
raytexture(r, m->omod); |