1 |
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/* Copyright (c) 1992 Regents of the University of California */ |
2 |
– |
|
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 |
|
/* |
5 |
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* source.c - routines dealing with illumination sources. |
6 |
|
* |
7 |
< |
* 8/20/85 |
7 |
> |
* External symbols declared in source.h |
8 |
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*/ |
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|
10 |
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#include "ray.h" |
14 |
– |
|
15 |
– |
#include "octree.h" |
16 |
– |
|
11 |
|
#include "otypes.h" |
12 |
< |
|
12 |
> |
#include "otspecial.h" |
13 |
> |
#include "rtotypes.h" |
14 |
|
#include "source.h" |
15 |
+ |
#include "random.h" |
16 |
+ |
#include "pmapsrc.h" |
17 |
+ |
#include "pmapmat.h" |
18 |
|
|
19 |
+ |
#ifndef MAXSSAMP |
20 |
+ |
#define MAXSSAMP 16 /* maximum samples per ray */ |
21 |
+ |
#endif |
22 |
+ |
|
23 |
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/* |
24 |
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* Structures used by direct() |
25 |
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*/ |
36 |
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float brt; /* brightness (for comparison) */ |
37 |
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} CNTPTR; /* contribution pointer */ |
38 |
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|
39 |
< |
static CONTRIB *srccnt; /* source contributions in direct() */ |
40 |
< |
static CNTPTR *cntord; /* source ordering in direct() */ |
39 |
> |
static CONTRIB *srccnt = NULL; /* source contributions in direct() */ |
40 |
> |
static CNTPTR *cntord = NULL; /* source ordering in direct() */ |
41 |
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static int maxcntr = 0; /* size of contribution arrays */ |
42 |
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|
43 |
+ |
static int cntcmp(const void *p1, const void *p2); |
44 |
|
|
45 |
< |
marksources() /* find and mark source objects */ |
45 |
> |
|
46 |
> |
void |
47 |
> |
marksources(void) /* find and mark source objects */ |
48 |
|
{ |
49 |
< |
int foundsource = 0; |
49 |
> |
int indirect = 0; |
50 |
|
int i; |
51 |
< |
register OBJREC *o, *m; |
52 |
< |
register int ns; |
51 |
> |
OBJREC *o, *m; |
52 |
> |
int ns; |
53 |
> |
/* call us only once! */ |
54 |
> |
if (nsources) |
55 |
> |
error(CONSISTENCY, "Multiple calls to marksources!"); |
56 |
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/* initialize dispatch table */ |
57 |
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initstypes(); |
58 |
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/* find direct sources */ |
59 |
< |
for (i = 0; i < nobjects; i++) { |
59 |
> |
for (i = 0; i < nsceneobjs; i++) { |
60 |
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|
61 |
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o = objptr(i); |
62 |
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|
63 |
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if (!issurface(o->otype) || o->omod == OVOID) |
64 |
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continue; |
65 |
< |
|
66 |
< |
m = objptr(o->omod); |
67 |
< |
|
60 |
< |
if (!islight(m->otype)) |
65 |
> |
/* find material */ |
66 |
> |
m = findmaterial(o); |
67 |
> |
if (m == NULL) |
68 |
|
continue; |
69 |
+ |
if (m->otype == MAT_CLIP) { |
70 |
+ |
markclip(m); /* special case for antimatter */ |
71 |
+ |
continue; |
72 |
+ |
} |
73 |
+ |
if (!islight(m->otype)) |
74 |
+ |
continue; /* not source modifier */ |
75 |
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|
76 |
|
if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 : |
77 |
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m->otype == MAT_SPOT ? 7 : 3)) |
78 |
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objerror(m, USER, "bad # arguments"); |
79 |
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|
80 |
+ |
if (m->oargs.farg[0] <= FTINY && (m->oargs.farg[1] <= FTINY) & |
81 |
+ |
(m->oargs.farg[2] <= FTINY)) |
82 |
+ |
continue; /* don't bother */ |
83 |
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if (m->otype == MAT_GLOW && |
84 |
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o->otype != OBJ_SOURCE && |
85 |
< |
m->oargs.farg[3] <= FTINY) |
86 |
< |
continue; /* don't bother */ |
87 |
< |
|
85 |
> |
m->oargs.farg[3] <= FTINY) { |
86 |
> |
indirect += (ambounce > 0); |
87 |
> |
continue; /* don't track these */ |
88 |
> |
} |
89 |
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if (sfun[o->otype].of == NULL || |
90 |
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sfun[o->otype].of->setsrc == NULL) |
91 |
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objerror(o, USER, "illegal material"); |
98 |
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if (m->otype == MAT_GLOW) { |
99 |
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source[ns].sflags |= SPROX; |
100 |
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source[ns].sl.prox = m->oargs.farg[3]; |
101 |
< |
if (source[ns].sflags & SDISTANT) |
101 |
> |
if (source[ns].sflags & SDISTANT) { |
102 |
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source[ns].sflags |= SSKIP; |
103 |
+ |
indirect += (ambounce > 0); |
104 |
+ |
} |
105 |
|
} else if (m->otype == MAT_SPOT) { |
106 |
+ |
if (source[ns].sflags & SDISTANT) |
107 |
+ |
objerror(o, WARNING, |
108 |
+ |
"distant source is a spotlight"); |
109 |
|
source[ns].sflags |= SSPOT; |
110 |
|
if ((source[ns].sl.s = makespot(m)) == NULL) |
111 |
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goto memerr; |
116 |
|
source[ns].sflags |= SSKIP; |
117 |
|
} |
118 |
|
} |
119 |
< |
if (!(source[ns].sflags & SSKIP)) |
98 |
< |
foundsource++; |
119 |
> |
maxcntr += !(source[ns].sflags & SSKIP); |
120 |
|
} |
121 |
< |
if (!foundsource) { |
122 |
< |
error(WARNING, "no light sources found"); |
123 |
< |
return; |
121 |
> |
if (!maxcntr) { |
122 |
> |
if (!indirect) |
123 |
> |
error(WARNING, "no light sources found"); |
124 |
> |
return; /* no direct calculation, it seems */ |
125 |
|
} |
126 |
< |
markvirtuals(); /* find and add virtual sources */ |
126 |
> |
#if SHADCACHE |
127 |
> |
for (ns = 0; ns < nsources; ns++) /* initialize obstructor cache */ |
128 |
> |
initobscache(ns); |
129 |
> |
#endif |
130 |
> |
/* PMAP: disable virtual sources */ |
131 |
> |
if (!photonMapping) |
132 |
> |
markvirtuals(); /* find and add virtual sources */ |
133 |
> |
|
134 |
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/* allocate our contribution arrays */ |
135 |
< |
maxcntr = nsources + MAXSPART; /* start with this many */ |
135 |
> |
maxcntr += MAXSPART; /* start with this many */ |
136 |
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srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
137 |
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cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
138 |
< |
if (srccnt == NULL | cntord == NULL) |
139 |
< |
goto memerr; |
111 |
< |
return; |
138 |
> |
if ((srccnt != NULL) & (cntord != NULL)) |
139 |
> |
return; |
140 |
|
memerr: |
141 |
|
error(SYSTEM, "out of memory in marksources"); |
142 |
|
} |
143 |
|
|
144 |
|
|
145 |
< |
srcray(sr, r, si) /* send a ray to a source, return domega */ |
146 |
< |
register RAY *sr; /* returned source ray */ |
119 |
< |
RAY *r; /* ray which hit object */ |
120 |
< |
SRCINDEX *si; /* source sample index */ |
145 |
> |
void |
146 |
> |
distantsources(void) /* only mark distant sources */ |
147 |
|
{ |
148 |
< |
double d; /* distance to source */ |
149 |
< |
register SRCREC *srcp; |
148 |
> |
int i; |
149 |
> |
OBJREC *o, *m; |
150 |
> |
int ns; |
151 |
> |
/* call us only once! */ |
152 |
> |
if (nsources) |
153 |
> |
error(CONSISTENCY, "Multiple calls to distantsources!"); |
154 |
> |
/* initialize dispatch table */ |
155 |
> |
initstypes(); |
156 |
> |
/* sources needed for sourcehit() */ |
157 |
> |
for (i = 0; i < nsceneobjs; i++) { |
158 |
> |
|
159 |
> |
o = objptr(i); |
160 |
|
|
161 |
< |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
126 |
< |
|
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)) |
161 |
> |
if ((o->otype != OBJ_SOURCE) | (o->omod == OVOID)) |
162 |
|
continue; |
163 |
< |
return(1); /* sample OK */ |
163 |
> |
/* find material */ |
164 |
> |
m = findmaterial(o); |
165 |
> |
if (m == NULL) |
166 |
> |
continue; |
167 |
> |
if (!islight(m->otype)) |
168 |
> |
continue; /* not source modifier */ |
169 |
> |
|
170 |
> |
if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 : |
171 |
> |
m->otype == MAT_SPOT ? 7 : 3)) |
172 |
> |
objerror(m, USER, "bad # arguments"); |
173 |
> |
|
174 |
> |
if (m->oargs.farg[0] <= FTINY && (m->oargs.farg[1] <= FTINY) & |
175 |
> |
(m->oargs.farg[2] <= FTINY)) |
176 |
> |
continue; /* don't bother */ |
177 |
> |
if (sfun[o->otype].of == NULL || |
178 |
> |
sfun[o->otype].of->setsrc == NULL) |
179 |
> |
objerror(o, USER, "illegal material"); |
180 |
> |
|
181 |
> |
if ((ns = newsource()) < 0) |
182 |
> |
error(SYSTEM, "out of memory in distantsources"); |
183 |
> |
|
184 |
> |
setsource(&source[ns], o); |
185 |
> |
|
186 |
> |
if (m->otype == MAT_GLOW) { |
187 |
> |
source[ns].sflags |= SPROX|SSKIP; |
188 |
> |
source[ns].sl.prox = m->oargs.farg[3]; |
189 |
> |
} else if (m->otype == MAT_SPOT) |
190 |
> |
objerror(o, WARNING, "distant source is a spotlight"); |
191 |
|
} |
192 |
+ |
} |
193 |
+ |
|
194 |
+ |
|
195 |
+ |
void |
196 |
+ |
freesources(void) /* free all source structures */ |
197 |
+ |
{ |
198 |
+ |
if (nsources > 0) { |
199 |
+ |
#if SHADCACHE |
200 |
+ |
while (nsources--) |
201 |
+ |
freeobscache(&source[nsources]); |
202 |
+ |
#endif |
203 |
+ |
free((void *)source); |
204 |
+ |
source = NULL; |
205 |
+ |
nsources = 0; |
206 |
+ |
} |
207 |
+ |
markclip(NULL); |
208 |
+ |
if (maxcntr <= 0) |
209 |
+ |
return; |
210 |
+ |
free((void *)srccnt); |
211 |
+ |
srccnt = NULL; |
212 |
+ |
free((void *)cntord); |
213 |
+ |
cntord = NULL; |
214 |
+ |
maxcntr = 0; |
215 |
+ |
} |
216 |
+ |
|
217 |
+ |
|
218 |
+ |
int |
219 |
+ |
srcray( /* send a ray to a source, return domega */ |
220 |
+ |
RAY *sr, /* returned source ray */ |
221 |
+ |
RAY *r, /* ray which hit object */ |
222 |
+ |
SRCINDEX *si /* source sample index */ |
223 |
+ |
) |
224 |
+ |
{ |
225 |
+ |
double d; /* distance to source */ |
226 |
+ |
SRCREC *srcp; |
227 |
+ |
|
228 |
+ |
rayorigin(sr, SHADOW, r, NULL); /* ignore limits */ |
229 |
+ |
|
230 |
+ |
if (r == NULL) |
231 |
+ |
sr->rmax = 0.0; |
232 |
+ |
|
233 |
+ |
while ((d = nextssamp(sr, si)) != 0.0) { |
234 |
+ |
sr->rsrc = si->sn; /* remember source */ |
235 |
+ |
srcp = source + si->sn; |
236 |
+ |
if (srcp->sflags & SDISTANT) { |
237 |
+ |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
238 |
+ |
continue; |
239 |
+ |
return(1); /* sample OK */ |
240 |
+ |
} |
241 |
|
/* local source */ |
242 |
|
/* check proximity */ |
243 |
< |
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)) |
243 |
> |
if (srcp->sflags & SPROX && d > srcp->sl.prox) |
244 |
|
continue; |
245 |
+ |
/* check angle */ |
246 |
+ |
if (srcp->sflags & SSPOT) { |
247 |
+ |
if (spotout(sr, srcp->sl.s)) |
248 |
+ |
continue; |
249 |
|
/* adjust solid angle */ |
250 |
< |
si->dom *= d*d; |
251 |
< |
d += srcp->sl.s->flen; |
252 |
< |
si->dom /= d*d; |
250 |
> |
si->dom *= d*d; |
251 |
> |
d += srcp->sl.s->flen; |
252 |
> |
si->dom /= d*d; |
253 |
> |
} |
254 |
> |
return(1); /* sample OK */ |
255 |
|
} |
256 |
< |
return(1); /* sample OK */ |
149 |
< |
} |
150 |
< |
return(0); /* no more samples */ |
256 |
> |
return(0); /* no more samples */ |
257 |
|
} |
258 |
|
|
259 |
|
|
260 |
< |
srcvalue(r) /* punch ray to source and compute value */ |
261 |
< |
RAY *r; |
260 |
> |
void |
261 |
> |
srcvalue( /* punch ray to source and compute value */ |
262 |
> |
RAY *r |
263 |
> |
) |
264 |
|
{ |
265 |
< |
register SRCREC *sp; |
265 |
> |
SRCREC *sp; |
266 |
|
|
267 |
|
sp = &source[r->rsrc]; |
268 |
|
if (sp->sflags & SVIRTUAL) { /* virtual source */ |
269 |
|
/* check intersection */ |
270 |
|
if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
271 |
|
return; |
272 |
< |
raycont(r); /* compute contribution */ |
272 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
273 |
> |
goto nomat; |
274 |
> |
rayparticipate(r); |
275 |
|
return; |
276 |
|
} |
277 |
|
/* compute intersection */ |
279 |
|
(*ofun[sp->so->otype].funp)(sp->so, r)) { |
280 |
|
if (sp->sa.success >= 0) |
281 |
|
sp->sa.success++; |
282 |
< |
raycont(r); /* compute contribution */ |
282 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
283 |
> |
goto nomat; |
284 |
> |
rayparticipate(r); |
285 |
|
return; |
286 |
|
} |
287 |
+ |
/* we missed our mark! */ |
288 |
|
if (sp->sa.success < 0) |
289 |
|
return; /* bitched already */ |
290 |
|
sp->sa.success -= AIMREQT; |
293 |
|
sprintf(errmsg, "aiming failure for light source \"%s\"", |
294 |
|
sp->so->oname); |
295 |
|
error(WARNING, errmsg); /* issue warning */ |
296 |
+ |
return; |
297 |
+ |
nomat: |
298 |
+ |
objerror(r->ro, USER, "material not found"); |
299 |
|
} |
300 |
|
|
301 |
|
|
302 |
< |
sourcehit(r) /* check to see if ray hit distant source */ |
303 |
< |
register RAY *r; |
302 |
> |
static int |
303 |
> |
transillum( /* check if material is transparent illum */ |
304 |
> |
OBJREC *m |
305 |
> |
) |
306 |
|
{ |
307 |
+ |
m = findmaterial(m); |
308 |
+ |
if (m == NULL) |
309 |
+ |
return(1); |
310 |
+ |
if (m->otype != MAT_ILLUM) |
311 |
+ |
return(0); |
312 |
+ |
return(!m->oargs.nsargs || !strcmp(m->oargs.sarg[0], VOIDID)); |
313 |
+ |
} |
314 |
+ |
|
315 |
+ |
|
316 |
+ |
int |
317 |
+ |
sourcehit( /* check to see if ray hit distant source */ |
318 |
+ |
RAY *r |
319 |
+ |
) |
320 |
+ |
{ |
321 |
+ |
int glowsrc = -1; |
322 |
+ |
int transrc = -1; |
323 |
|
int first, last; |
324 |
< |
register int i; |
324 |
> |
int i; |
325 |
|
|
326 |
|
if (r->rsrc >= 0) { /* check only one if aimed */ |
327 |
|
first = last = r->rsrc; |
328 |
|
} else { /* otherwise check all */ |
329 |
|
first = 0; last = nsources-1; |
330 |
|
} |
331 |
< |
for (i = first; i <= last; i++) |
332 |
< |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
333 |
< |
/* |
334 |
< |
* Check to see if ray is within |
335 |
< |
* solid angle of source. |
336 |
< |
*/ |
337 |
< |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
338 |
< |
<= source[i].ss2) { |
339 |
< |
r->ro = source[i].so; |
340 |
< |
if (!(source[i].sflags & SSKIP)) |
341 |
< |
break; |
342 |
< |
} |
343 |
< |
|
344 |
< |
if (r->ro != NULL) { |
345 |
< |
for (i = 0; i < 3; i++) |
346 |
< |
r->ron[i] = -r->rdir[i]; |
347 |
< |
r->rod = 1.0; |
348 |
< |
r->rox = NULL; |
349 |
< |
return(1); |
331 |
> |
for (i = first; i <= last; i++) { |
332 |
> |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) != SDISTANT) |
333 |
> |
continue; |
334 |
> |
/* |
335 |
> |
* Check to see if ray is within |
336 |
> |
* solid angle of source. |
337 |
> |
*/ |
338 |
> |
if (2.*PI*(1. - DOT(source[i].sloc,r->rdir)) > source[i].ss2) |
339 |
> |
continue; |
340 |
> |
/* is it what we aimed for? */ |
341 |
> |
if (i == r->rsrc) { |
342 |
> |
r->ro = source[i].so; |
343 |
> |
break; |
344 |
> |
} |
345 |
> |
/* |
346 |
> |
* If it's a glow or transparent illum, just remember it. |
347 |
> |
*/ |
348 |
> |
if (source[i].sflags & SSKIP) { |
349 |
> |
if (glowsrc < 0) |
350 |
> |
glowsrc = i; |
351 |
> |
continue; |
352 |
> |
} |
353 |
> |
if (transillum(source[i].so)) { |
354 |
> |
if (transrc < 0) |
355 |
> |
transrc = i; |
356 |
> |
continue; |
357 |
> |
} |
358 |
> |
r->ro = source[i].so; /* otherwise, use first hit */ |
359 |
> |
break; |
360 |
|
} |
361 |
< |
return(0); |
361 |
> |
/* |
362 |
> |
* Do we need fallback? |
363 |
> |
*/ |
364 |
> |
if (r->ro == NULL) { |
365 |
> |
if (transrc >= 0 && r->crtype & (AMBIENT|SPECULAR)) |
366 |
> |
return(0); /* avoid overcounting */ |
367 |
> |
if (glowsrc >= 0) |
368 |
> |
r->ro = source[glowsrc].so; |
369 |
> |
else |
370 |
> |
return(0); /* nothing usable */ |
371 |
> |
} |
372 |
> |
/* |
373 |
> |
* Assign object index |
374 |
> |
*/ |
375 |
> |
r->robj = objndx(r->ro); |
376 |
> |
return(1); |
377 |
|
} |
378 |
|
|
379 |
|
|
380 |
|
static int |
381 |
< |
cntcmp(sc1, sc2) /* contribution compare (descending) */ |
382 |
< |
register CNTPTR *sc1, *sc2; |
381 |
> |
cntcmp( /* contribution compare (descending) */ |
382 |
> |
const void *p1, |
383 |
> |
const void *p2 |
384 |
> |
) |
385 |
|
{ |
386 |
+ |
const CNTPTR *sc1 = (const CNTPTR *)p1; |
387 |
+ |
const CNTPTR *sc2 = (const CNTPTR *)p2; |
388 |
+ |
|
389 |
|
if (sc1->brt > sc2->brt) |
390 |
|
return(-1); |
391 |
|
if (sc1->brt < sc2->brt) |
394 |
|
} |
395 |
|
|
396 |
|
|
397 |
< |
direct(r, f, p) /* add direct component */ |
398 |
< |
RAY *r; /* ray that hit surface */ |
399 |
< |
int (*f)(); /* direct component coefficient function */ |
400 |
< |
char *p; /* data for f */ |
397 |
> |
void |
398 |
> |
direct( /* add direct component */ |
399 |
> |
RAY *r, /* ray that hit surface */ |
400 |
> |
srcdirf_t *f, /* direct component coefficient function */ |
401 |
> |
void *p /* data for f */ |
402 |
> |
) |
403 |
|
{ |
404 |
< |
extern int (*trace)(); |
405 |
< |
register int sn; |
240 |
< |
register CONTRIB *scp; |
404 |
> |
int sn; |
405 |
> |
CONTRIB *scp; |
406 |
|
SRCINDEX si; |
407 |
|
int nshadcheck, ncnts; |
408 |
|
int nhits; |
409 |
|
double prob, ourthresh, hwt; |
410 |
|
RAY sr; |
411 |
+ |
|
412 |
+ |
/* PMAP: Factor in direct photons (primarily for debugging/validation) */ |
413 |
+ |
if (directPhotonMapping) { |
414 |
+ |
(*f)(r -> rcol, p, r -> ron, PI); |
415 |
+ |
multDirectPmap(r); |
416 |
+ |
return; |
417 |
+ |
} |
418 |
|
/* NOTE: srccnt and cntord global so no recursion */ |
419 |
< |
if (nsources <= 0) |
420 |
< |
return; /* no sources?! */ |
421 |
< |
/* potential contributions */ |
422 |
< |
initsrcindex(&si); |
419 |
> |
if (maxcntr <= 0) |
420 |
> |
return; /* no direct?! */ |
421 |
> |
|
422 |
> |
initsrcindex(&si); /* potential contributions */ |
423 |
|
for (sn = 0; srcray(&sr, r, &si); sn++) { |
424 |
|
if (sn >= maxcntr) { |
425 |
|
maxcntr = sn + MAXSPART; |
426 |
< |
srccnt = (CONTRIB *)realloc((char *)srccnt, |
426 |
> |
srccnt = (CONTRIB *)realloc((void *)srccnt, |
427 |
|
maxcntr*sizeof(CONTRIB)); |
428 |
< |
cntord = (CNTPTR *)realloc((char *)cntord, |
428 |
> |
cntord = (CNTPTR *)realloc((void *)cntord, |
429 |
|
maxcntr*sizeof(CNTPTR)); |
430 |
< |
if (srccnt == NULL | cntord == NULL) |
430 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
431 |
|
error(SYSTEM, "out of memory in direct"); |
432 |
|
} |
433 |
|
cntord[sn].sndx = sn; |
434 |
|
scp = srccnt + sn; |
435 |
|
scp->sno = sr.rsrc; |
436 |
+ |
#if SHADCACHE /* check shadow cache */ |
437 |
+ |
if (si.np == 1 && srcblocked(&sr)) { |
438 |
+ |
cntord[sn].brt = 0.0; |
439 |
+ |
continue; |
440 |
+ |
} |
441 |
+ |
#endif |
442 |
|
/* compute coefficient */ |
443 |
|
(*f)(scp->coef, p, sr.rdir, si.dom); |
444 |
< |
cntord[sn].brt = bright(scp->coef); |
444 |
> |
cntord[sn].brt = intens(scp->coef); |
445 |
|
if (cntord[sn].brt <= 0.0) |
446 |
|
continue; |
447 |
|
VCOPY(scp->dir, sr.rdir); |
448 |
+ |
copycolor(sr.rcoef, scp->coef); |
449 |
|
/* compute potential */ |
450 |
|
sr.revf = srcvalue; |
451 |
|
rayvalue(&sr); |
452 |
+ |
multcolor(sr.rcol, sr.rcoef); |
453 |
|
copycolor(scp->val, sr.rcol); |
454 |
< |
multcolor(scp->val, scp->coef); |
275 |
< |
cntord[sn].brt = bright(scp->val); |
454 |
> |
cntord[sn].brt = bright(sr.rcol); |
455 |
|
} |
456 |
|
/* sort contributions */ |
457 |
|
qsort(cntord, sn, sizeof(CNTPTR), cntcmp); |
458 |
|
{ /* find last */ |
459 |
< |
register int l, m; |
459 |
> |
int l, m; |
460 |
|
|
461 |
|
ncnts = l = sn; |
462 |
|
sn = 0; |
478 |
|
/* modify threshold */ |
479 |
|
ourthresh = shadthresh / r->rweight; |
480 |
|
/* test for shadows */ |
481 |
< |
nhits = 0; |
482 |
< |
for (sn = 0; sn < ncnts; sn++) { |
481 |
> |
for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts; |
482 |
> |
hwt += (double)source[scp->sno].nhits / |
483 |
> |
(double)source[scp->sno].ntests, |
484 |
> |
sn++) { |
485 |
|
/* check threshold */ |
486 |
< |
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
486 |
> |
if (sn >= MINSHADCNT && |
487 |
> |
(sn+nshadcheck>=ncnts ? cntord[sn].brt : |
488 |
|
cntord[sn].brt-cntord[sn+nshadcheck].brt) |
489 |
< |
< ourthresh*bright(r->rcol)) |
489 |
> |
< ourthresh*bright(r->rcol)) |
490 |
|
break; |
491 |
|
scp = srccnt + cntord[sn].sndx; |
492 |
|
/* test for hit */ |
493 |
< |
rayorigin(&sr, r, SHADOW, 1.0); |
493 |
> |
rayorigin(&sr, SHADOW, r, NULL); |
494 |
> |
copycolor(sr.rcoef, scp->coef); |
495 |
|
VCOPY(sr.rdir, scp->dir); |
496 |
|
sr.rsrc = scp->sno; |
497 |
< |
source[scp->sno].ntests++; /* keep statistics */ |
497 |
> |
/* keep statistics */ |
498 |
> |
if (source[scp->sno].ntests++ > 0xfffffff0) { |
499 |
> |
source[scp->sno].ntests >>= 1; |
500 |
> |
source[scp->sno].nhits >>= 1; |
501 |
> |
} |
502 |
|
if (localhit(&sr, &thescene) && |
503 |
|
( sr.ro != source[scp->sno].so || |
504 |
|
source[scp->sno].sflags & SFOLLOW )) { |
506 |
|
raycont(&sr); |
507 |
|
if (trace != NULL) |
508 |
|
(*trace)(&sr); /* trace execution */ |
509 |
< |
if (bright(sr.rcol) <= FTINY) |
509 |
> |
if (bright(sr.rcol) <= FTINY) { |
510 |
> |
#if SHADCACHE |
511 |
> |
if ((scp <= srccnt || scp[-1].sno != scp->sno) |
512 |
> |
&& (scp >= srccnt+ncnts-1 || |
513 |
> |
scp[1].sno != scp->sno)) |
514 |
> |
srcblocker(&sr); |
515 |
> |
#endif |
516 |
|
continue; /* missed! */ |
517 |
+ |
} |
518 |
+ |
rayparticipate(&sr); |
519 |
+ |
multcolor(sr.rcol, sr.rcoef); |
520 |
|
copycolor(scp->val, sr.rcol); |
521 |
< |
multcolor(scp->val, scp->coef); |
521 |
> |
} else if (trace != NULL && |
522 |
> |
(source[scp->sno].sflags & (SDISTANT|SVIRTUAL|SFOLLOW)) |
523 |
> |
== (SDISTANT|SFOLLOW) && |
524 |
> |
sourcehit(&sr) && rayshade(&sr, sr.ro->omod)) { |
525 |
> |
(*trace)(&sr); /* trace execution */ |
526 |
> |
/* skip call to rayparticipate() & scp->val update */ |
527 |
|
} |
528 |
|
/* add contribution if hit */ |
529 |
|
addcolor(r->rcol, scp->val); |
530 |
|
nhits++; |
531 |
|
source[scp->sno].nhits++; |
532 |
|
} |
533 |
< |
/* surface hit rate */ |
534 |
< |
if (sn > 0) |
535 |
< |
hwt = (double)nhits / (double)sn; |
533 |
> |
/* source hit rate */ |
534 |
> |
if (hwt > FTINY) |
535 |
> |
hwt = (double)nhits / hwt; |
536 |
|
else |
537 |
|
hwt = 0.5; |
538 |
|
#ifdef DEBUG |
539 |
< |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
539 |
> |
sprintf(errmsg, "%d tested, %d untested, %f conditional hit rate\n", |
540 |
|
sn, ncnts-sn, hwt); |
541 |
|
eputs(errmsg); |
542 |
|
#endif |
545 |
|
scp = srccnt + cntord[sn].sndx; |
546 |
|
prob = hwt * (double)source[scp->sno].nhits / |
547 |
|
(double)source[scp->sno].ntests; |
548 |
< |
scalecolor(scp->val, prob); |
548 |
> |
if (prob < 1.0) |
549 |
> |
scalecolor(scp->val, prob); |
550 |
|
addcolor(r->rcol, scp->val); |
551 |
|
} |
552 |
|
} |
553 |
|
|
554 |
|
|
555 |
+ |
void |
556 |
+ |
srcscatter( /* compute source scattering into ray */ |
557 |
+ |
RAY *r |
558 |
+ |
) |
559 |
+ |
{ |
560 |
+ |
int oldsampndx; |
561 |
+ |
int nsamps; |
562 |
+ |
RAY sr; |
563 |
+ |
SRCINDEX si; |
564 |
+ |
double t, d; |
565 |
+ |
double re, ge, be; |
566 |
+ |
COLOR cvext; |
567 |
+ |
int i, j; |
568 |
+ |
|
569 |
+ |
if (r->rot >= FHUGE*.99 || r->gecc >= 1.-FTINY) |
570 |
+ |
return; /* this can never work */ |
571 |
+ |
/* PMAP: do unconditional inscattering for volume photons */ |
572 |
+ |
if (!volumePhotonMapping && (r->slights == NULL || r->slights[0] == 0)) |
573 |
+ |
return; |
574 |
+ |
|
575 |
+ |
if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) |
576 |
+ |
nsamps = 1; |
577 |
+ |
#if MAXSSAMP |
578 |
+ |
else if (nsamps > MAXSSAMP) |
579 |
+ |
nsamps = MAXSSAMP; |
580 |
+ |
#endif |
581 |
+ |
oldsampndx = samplendx; |
582 |
+ |
samplendx = random()&0x7fff; /* randomize */ |
583 |
+ |
for (i = volumePhotonMapping ? 1 : r->slights[0]; i > 0; i--) { |
584 |
+ |
/* for each source OR once if volume photon map enabled */ |
585 |
+ |
for (j = 0; j < nsamps; j++) { /* for each sample position */ |
586 |
+ |
samplendx++; |
587 |
+ |
t = r->rot * (j+frandom())/nsamps; |
588 |
+ |
/* extinction */ |
589 |
+ |
re = t*colval(r->cext,RED); |
590 |
+ |
ge = t*colval(r->cext,GRN); |
591 |
+ |
be = t*colval(r->cext,BLU); |
592 |
+ |
setcolor(cvext, re > 92. ? 0. : exp(-re), |
593 |
+ |
ge > 92. ? 0. : exp(-ge), |
594 |
+ |
be > 92. ? 0. : exp(-be)); |
595 |
+ |
if (intens(cvext) <= FTINY) |
596 |
+ |
break; /* too far away */ |
597 |
+ |
sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
598 |
+ |
sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
599 |
+ |
sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
600 |
+ |
|
601 |
+ |
if (!volumePhotonMapping) { |
602 |
+ |
initsrcindex(&si); /* sample ray to this source */ |
603 |
+ |
si.sn = r->slights[i]; |
604 |
+ |
nopart(&si, &sr); |
605 |
+ |
if (!srcray(&sr, NULL, &si) || |
606 |
+ |
sr.rsrc != r->slights[i]) |
607 |
+ |
continue; /* no path */ |
608 |
+ |
#if SHADCACHE |
609 |
+ |
if (srcblocked(&sr)) /* check shadow cache */ |
610 |
+ |
continue; |
611 |
+ |
#endif |
612 |
+ |
copycolor(sr.cext, r->cext); |
613 |
+ |
copycolor(sr.albedo, r->albedo); |
614 |
+ |
sr.gecc = r->gecc; |
615 |
+ |
sr.slights = r->slights; |
616 |
+ |
rayvalue(&sr); /* eval. source ray */ |
617 |
+ |
if (bright(sr.rcol) <= FTINY) { |
618 |
+ |
#if SHADCACHE |
619 |
+ |
srcblocker(&sr); /* add blocker to cache */ |
620 |
+ |
#endif |
621 |
+ |
continue; |
622 |
+ |
} |
623 |
+ |
if (r->gecc <= FTINY) /* compute P(theta) */ |
624 |
+ |
d = 1.; |
625 |
+ |
else { |
626 |
+ |
d = DOT(r->rdir, sr.rdir); |
627 |
+ |
d = 1. + r->gecc*r->gecc - 2.*r->gecc*d; |
628 |
+ |
d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); |
629 |
+ |
} |
630 |
+ |
/* other factors */ |
631 |
+ |
d *= si.dom * r->rot / (4.*PI*nsamps); |
632 |
+ |
scalecolor(sr.rcol, d); |
633 |
+ |
} else { |
634 |
+ |
/* PMAP: Add ambient inscattering from |
635 |
+ |
* volume photons; note we reverse the |
636 |
+ |
* incident ray direction since we're |
637 |
+ |
* now in *backward* raytracing mode! */ |
638 |
+ |
sr.rdir [0] = -r -> rdir [0]; |
639 |
+ |
sr.rdir [1] = -r -> rdir [1]; |
640 |
+ |
sr.rdir [2] = -r -> rdir [2]; |
641 |
+ |
sr.gecc = r -> gecc; |
642 |
+ |
inscatterVolumePmap(&sr, sr.rcol); |
643 |
+ |
scalecolor(sr.rcol, r -> rot / nsamps); |
644 |
+ |
} |
645 |
+ |
multcolor(sr.rcol, r->cext); |
646 |
+ |
multcolor(sr.rcol, r->albedo); |
647 |
+ |
multcolor(sr.rcol, cvext); |
648 |
+ |
addcolor(r->rcol, sr.rcol); /* add it in */ |
649 |
+ |
} |
650 |
+ |
} |
651 |
+ |
samplendx = oldsampndx; |
652 |
+ |
} |
653 |
+ |
|
654 |
+ |
|
655 |
|
/**************************************************************** |
656 |
|
* The following macros were separated from the m_light() routine |
657 |
|
* because they are very nasty and difficult to understand. |
658 |
|
*/ |
659 |
|
|
660 |
< |
/* wrongillum * |
660 |
> |
/* illumblock * |
661 |
|
* |
662 |
|
* We cannot allow an illum to pass to another illum, because that |
663 |
|
* would almost certainly constitute overcounting. |
664 |
|
* However, we do allow an illum to pass to another illum |
665 |
|
* that is actually going to relay to a virtual light source. |
666 |
+ |
* We also prevent an illum from passing to a glow; this provides a |
667 |
+ |
* convenient mechanism for defining detailed light source |
668 |
+ |
* geometry behind (or inside) an effective radiator. |
669 |
|
*/ |
670 |
|
|
671 |
< |
#define wrongillum(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
672 |
< |
objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM) |
671 |
> |
static int |
672 |
> |
weaksrcmat(OBJREC *m) /* identify material */ |
673 |
> |
{ |
674 |
> |
m = findmaterial(m); |
675 |
> |
if (m == NULL) return(0); |
676 |
> |
return((m->otype==MAT_ILLUM) | (m->otype==MAT_GLOW)); |
677 |
> |
} |
678 |
|
|
679 |
+ |
#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
680 |
+ |
r->rod > 0.0 && \ |
681 |
+ |
weaksrcmat(source[r->rsrc].so)) |
682 |
+ |
|
683 |
|
/* wrongsource * |
684 |
|
* |
685 |
|
* This source is the wrong source (ie. overcounted) if we are |
686 |
|
* aimed to a different source than the one we hit and the one |
687 |
< |
* we hit is not an illum which should be passed. |
687 |
> |
* we hit is not an illum that should be passed. |
688 |
|
*/ |
689 |
|
|
690 |
|
#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
691 |
< |
(m->otype!=MAT_ILLUM || wrongillum(m,r))) |
691 |
> |
(m->otype!=MAT_ILLUM || illumblock(m,r))) |
692 |
|
|
693 |
|
/* distglow * |
694 |
|
* |
695 |
|
* A distant glow is an object that sometimes acts as a light source, |
696 |
|
* but is too far away from the test point to be one in this case. |
697 |
+ |
* (Glows with negative radii should NEVER participate in illumination.) |
698 |
|
*/ |
699 |
|
|
700 |
< |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
701 |
< |
r->rot > m->oargs.farg[3]) |
700 |
> |
#define distglow(m, r, d) (m->otype==MAT_GLOW && \ |
701 |
> |
m->oargs.farg[3] >= -FTINY && \ |
702 |
> |
d > m->oargs.farg[3]) |
703 |
|
|
704 |
|
/* badcomponent * |
705 |
|
* |
709 |
|
* The same is true for stray specular samples, since the specular |
710 |
|
* contribution from light sources is calculated separately. |
711 |
|
*/ |
712 |
< |
|
713 |
< |
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
712 |
> |
/* PMAP: Also avoid counting sources via transferred ambient rays (e.g. |
713 |
> |
* through glass) when photon mapping is enabled, as these indirect |
714 |
> |
* components are already accounted for. |
715 |
> |
*/ |
716 |
> |
#define badcomponent(m, r) (srcRayInPmap(r) || \ |
717 |
> |
(r->crtype&(AMBIENT|SPECULAR) && \ |
718 |
|
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
719 |
< |
distglow(m, r))) |
719 |
> |
/* not 100% correct */ distglow(m, r, r->rot)))) |
720 |
|
|
401 |
– |
/* overcount * |
402 |
– |
* |
403 |
– |
* All overcounting possibilities are contained here. |
404 |
– |
*/ |
405 |
– |
|
406 |
– |
#define overcount(m, r) (badcomponent(m,r) || wrongsource(m,r)) |
407 |
– |
|
721 |
|
/* passillum * |
722 |
|
* |
723 |
|
* An illum passes to another material type when we didn't hit it |
731 |
|
|
732 |
|
/* srcignore * |
733 |
|
* |
734 |
< |
* The -di flag renders light sources invisible, and here is the test. |
734 |
> |
* The -dv flag is normally on for sources to be visible. |
735 |
|
*/ |
736 |
|
|
737 |
< |
#define srcignore(m, r) (!directvis && !(r->crtype&SHADOW) && \ |
738 |
< |
!distglow(m, r)) |
737 |
> |
#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
738 |
> |
distglow(m, r, raydist(r,PRIMARY))) |
739 |
|
|
740 |
|
|
741 |
< |
m_light(m, r) /* ray hit a light source */ |
742 |
< |
register OBJREC *m; |
743 |
< |
register RAY *r; |
741 |
> |
int |
742 |
> |
m_light( /* ray hit a light source */ |
743 |
> |
OBJREC *m, |
744 |
> |
RAY *r |
745 |
> |
) |
746 |
|
{ |
747 |
|
/* check for over-counting */ |
748 |
< |
if (overcount(m, r)) |
749 |
< |
return; |
748 |
> |
if (badcomponent(m, r)) { |
749 |
> |
setcolor(r->rcoef, 0.0, 0.0, 0.0); |
750 |
> |
return(1); |
751 |
> |
} |
752 |
> |
if (wrongsource(m, r)) { |
753 |
> |
setcolor(r->rcoef, 0.0, 0.0, 0.0); |
754 |
> |
return(1); |
755 |
> |
} |
756 |
|
/* check for passed illum */ |
757 |
|
if (passillum(m, r)) { |
758 |
< |
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
759 |
< |
raytrans(r); |
760 |
< |
else |
761 |
< |
rayshade(r, modifier(m->oargs.sarg[0])); |
441 |
< |
return; |
758 |
> |
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
759 |
> |
return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); |
760 |
> |
raytrans(r); |
761 |
> |
return(1); |
762 |
|
} |
443 |
– |
/* otherwise treat as source */ |
444 |
– |
/* check for behind */ |
445 |
– |
if (r->rod < 0.0) |
446 |
– |
return; |
763 |
|
/* check for invisibility */ |
764 |
< |
if (srcignore(m, r)) |
765 |
< |
return; |
764 |
> |
if (srcignore(m, r)) { |
765 |
> |
setcolor(r->rcoef, 0.0, 0.0, 0.0); |
766 |
> |
return(1); |
767 |
> |
} |
768 |
> |
/* otherwise treat as source */ |
769 |
> |
if (r->rod < 0.0) { /* check for behind */ |
770 |
> |
if (!backvis) |
771 |
> |
raytrans(r); /* used to return black */ |
772 |
> |
return(1); |
773 |
> |
} |
774 |
|
/* check for outside spot */ |
775 |
< |
if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) |
776 |
< |
return; |
775 |
> |
if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |
776 |
> |
return(1); |
777 |
|
/* get distribution pattern */ |
778 |
|
raytexture(r, m->omod); |
779 |
|
/* get source color */ |
782 |
|
m->oargs.farg[2]); |
783 |
|
/* modify value */ |
784 |
|
multcolor(r->rcol, r->pcol); |
785 |
+ |
return(1); |
786 |
|
} |