1 |
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/* Copyright (c) 1991 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 |
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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 |
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|
16 |
+ |
extern double ssampdist; /* scatter sampling distance */ |
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 |
> |
extern OBJREC * /* find an object's actual material */ |
46 |
> |
findmaterial(register 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 |
+ |
ao = objptr(aobj); |
56 |
+ |
if (ismaterial(ao->otype)) |
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 |
+ |
extern void |
68 |
+ |
marksources(void) /* find and mark source objects */ |
69 |
+ |
{ |
70 |
+ |
int foundsource = 0; |
71 |
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int i; |
72 |
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register OBJREC *o, *m; |
73 |
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register 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 |
< |
|
86 |
< |
if (!islight(m->otype)) |
60 |
< |
continue; |
83 |
> |
/* find material */ |
84 |
> |
m = findmaterial(objptr(o->omod)); |
85 |
> |
if (m == NULL || !islight(m->otype)) |
86 |
> |
continue; /* not source modifier */ |
87 |
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|
88 |
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if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 : |
89 |
|
m->otype == MAT_SPOT ? 7 : 3)) |
93 |
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o->otype != OBJ_SOURCE && |
94 |
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m->oargs.farg[3] <= FTINY) |
95 |
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continue; /* don't bother */ |
96 |
+ |
if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY && |
97 |
+ |
m->oargs.farg[2] <= FTINY) |
98 |
+ |
continue; /* don't bother */ |
99 |
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|
100 |
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if (sfun[o->otype].of == NULL || |
101 |
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sfun[o->otype].of->setsrc == NULL) |
109 |
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if (m->otype == MAT_GLOW) { |
110 |
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source[ns].sflags |= SPROX; |
111 |
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source[ns].sl.prox = m->oargs.farg[3]; |
112 |
< |
if (o->otype == OBJ_SOURCE) |
112 |
> |
if (source[ns].sflags & SDISTANT) |
113 |
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source[ns].sflags |= SSKIP; |
114 |
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} else if (m->otype == MAT_SPOT) { |
115 |
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source[ns].sflags |= SSPOT; |
122 |
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source[ns].sflags |= SSKIP; |
123 |
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} |
124 |
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} |
125 |
+ |
#if SHADCACHE |
126 |
+ |
initobscache(ns); |
127 |
+ |
#endif |
128 |
+ |
if (!(source[ns].sflags & SSKIP)) |
129 |
+ |
foundsource++; |
130 |
|
} |
131 |
< |
if (nsources <= 0) { |
131 |
> |
if (!foundsource) { |
132 |
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error(WARNING, "no light sources found"); |
133 |
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return; |
134 |
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} |
137 |
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maxcntr = nsources + MAXSPART; /* start with this many */ |
138 |
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srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
139 |
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cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
140 |
< |
if (srccnt == NULL | cntord == NULL) |
140 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
141 |
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goto memerr; |
142 |
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return; |
143 |
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memerr: |
145 |
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} |
146 |
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|
147 |
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|
148 |
< |
srcray(sr, r, si) /* send a ray to a source, return domega */ |
149 |
< |
register RAY *sr; /* returned source ray */ |
116 |
< |
RAY *r; /* ray which hit object */ |
117 |
< |
SRCINDEX *si; /* source sample index */ |
148 |
> |
extern void |
149 |
> |
freesources(void) /* free all source structures */ |
150 |
|
{ |
151 |
+ |
if (nsources > 0) { |
152 |
+ |
#if SHADCACHE |
153 |
+ |
while (nsources--) |
154 |
+ |
freeobscache(&source[nsources]); |
155 |
+ |
#endif |
156 |
+ |
free((void *)source); |
157 |
+ |
source = NULL; |
158 |
+ |
nsources = 0; |
159 |
+ |
} |
160 |
+ |
if (maxcntr <= 0) |
161 |
+ |
return; |
162 |
+ |
free((void *)srccnt); |
163 |
+ |
srccnt = NULL; |
164 |
+ |
free((void *)cntord); |
165 |
+ |
cntord = NULL; |
166 |
+ |
maxcntr = 0; |
167 |
+ |
} |
168 |
+ |
|
169 |
+ |
|
170 |
+ |
extern int |
171 |
+ |
srcray( /* send a ray to a source, return domega */ |
172 |
+ |
register RAY *sr, /* returned source ray */ |
173 |
+ |
RAY *r, /* ray which hit object */ |
174 |
+ |
SRCINDEX *si /* source sample index */ |
175 |
+ |
) |
176 |
+ |
{ |
177 |
|
double d; /* distance to source */ |
120 |
– |
FVECT vd; |
178 |
|
register SRCREC *srcp; |
122 |
– |
register int i; |
179 |
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|
180 |
< |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
180 |
> |
rayorigin(sr, SHADOW, r, NULL); /* ignore limits */ |
181 |
|
|
182 |
|
while ((d = nextssamp(sr, si)) != 0.0) { |
183 |
|
sr->rsrc = si->sn; /* remember source */ |
184 |
|
srcp = source + si->sn; |
185 |
|
if (srcp->sflags & SDISTANT) { |
186 |
< |
if (srcp->sflags & SSPOT) { /* check location */ |
187 |
< |
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 |
< |
continue; |
139 |
< |
} |
186 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
187 |
> |
continue; |
188 |
|
return(1); /* sample OK */ |
189 |
|
} |
190 |
|
/* local source */ |
193 |
|
continue; |
194 |
|
/* check angle */ |
195 |
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if (srcp->sflags & SSPOT) { |
196 |
< |
if (srcp->sl.s->siz < 2.0*PI * |
149 |
< |
(1.0 + DOT(srcp->sl.s->aim,sr->rdir))) |
196 |
> |
if (spotout(sr, srcp->sl.s)) |
197 |
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continue; |
198 |
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/* adjust solid angle */ |
199 |
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si->dom *= d*d; |
206 |
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} |
207 |
|
|
208 |
|
|
209 |
< |
srcvalue(r) /* punch ray to source and compute value */ |
210 |
< |
RAY *r; |
209 |
> |
extern void |
210 |
> |
srcvalue( /* punch ray to source and compute value */ |
211 |
> |
register RAY *r |
212 |
> |
) |
213 |
|
{ |
214 |
|
register SRCREC *sp; |
215 |
|
|
218 |
|
/* check intersection */ |
219 |
|
if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
220 |
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return; |
221 |
< |
raycont(r); /* compute contribution */ |
221 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
222 |
> |
goto nomat; |
223 |
> |
rayparticipate(r); |
224 |
|
return; |
225 |
|
} |
226 |
|
/* compute intersection */ |
228 |
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(*ofun[sp->so->otype].funp)(sp->so, r)) { |
229 |
|
if (sp->sa.success >= 0) |
230 |
|
sp->sa.success++; |
231 |
< |
raycont(r); /* compute contribution */ |
231 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
232 |
> |
goto nomat; |
233 |
> |
rayparticipate(r); |
234 |
|
return; |
235 |
|
} |
236 |
+ |
/* we missed our mark! */ |
237 |
|
if (sp->sa.success < 0) |
238 |
|
return; /* bitched already */ |
239 |
|
sp->sa.success -= AIMREQT; |
242 |
|
sprintf(errmsg, "aiming failure for light source \"%s\"", |
243 |
|
sp->so->oname); |
244 |
|
error(WARNING, errmsg); /* issue warning */ |
245 |
+ |
return; |
246 |
+ |
nomat: |
247 |
+ |
objerror(r->ro, USER, "material not found"); |
248 |
|
} |
249 |
|
|
250 |
|
|
251 |
|
static int |
252 |
< |
cntcmp(sc1, sc2) /* contribution compare (descending) */ |
253 |
< |
register CNTPTR *sc1, *sc2; |
252 |
> |
transillum( /* check if material is transparent illum */ |
253 |
> |
OBJECT obj |
254 |
> |
) |
255 |
|
{ |
256 |
+ |
OBJREC *m = findmaterial(objptr(obj)); |
257 |
+ |
|
258 |
+ |
if (m == NULL) |
259 |
+ |
return(1); |
260 |
+ |
if (m->otype != MAT_ILLUM) |
261 |
+ |
return(0); |
262 |
+ |
return(!m->oargs.nsargs || !strcmp(m->oargs.sarg[0], VOIDID)); |
263 |
+ |
} |
264 |
+ |
|
265 |
+ |
|
266 |
+ |
extern int |
267 |
+ |
sourcehit( /* check to see if ray hit distant source */ |
268 |
+ |
register RAY *r |
269 |
+ |
) |
270 |
+ |
{ |
271 |
+ |
int glowsrc = -1; |
272 |
+ |
int transrc = -1; |
273 |
+ |
int first, last; |
274 |
+ |
register int i; |
275 |
+ |
|
276 |
+ |
if (r->rsrc >= 0) { /* check only one if aimed */ |
277 |
+ |
first = last = r->rsrc; |
278 |
+ |
} else { /* otherwise check all */ |
279 |
+ |
first = 0; last = nsources-1; |
280 |
+ |
} |
281 |
+ |
for (i = first; i <= last; i++) { |
282 |
+ |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) != SDISTANT) |
283 |
+ |
continue; |
284 |
+ |
/* |
285 |
+ |
* Check to see if ray is within |
286 |
+ |
* solid angle of source. |
287 |
+ |
*/ |
288 |
+ |
if (2.*PI*(1. - DOT(source[i].sloc,r->rdir)) > source[i].ss2) |
289 |
+ |
continue; |
290 |
+ |
/* is it the only possibility? */ |
291 |
+ |
if (first == last) { |
292 |
+ |
r->ro = source[i].so; |
293 |
+ |
break; |
294 |
+ |
} |
295 |
+ |
/* |
296 |
+ |
* If it's a glow or transparent illum, just remember it. |
297 |
+ |
*/ |
298 |
+ |
if (source[i].sflags & SSKIP) { |
299 |
+ |
glowsrc = i; |
300 |
+ |
continue; |
301 |
+ |
} |
302 |
+ |
if (transillum(source[i].so->omod)) { |
303 |
+ |
transrc = i; |
304 |
+ |
continue; |
305 |
+ |
} |
306 |
+ |
r->ro = source[i].so; /* otherwise, use first hit */ |
307 |
+ |
break; |
308 |
+ |
} |
309 |
+ |
/* |
310 |
+ |
* Do we need fallback? |
311 |
+ |
*/ |
312 |
+ |
if (r->ro == NULL) { |
313 |
+ |
if (transrc >= 0 && r->crtype & (AMBIENT|SPECULAR)) |
314 |
+ |
return(0); /* avoid overcounting */ |
315 |
+ |
if (glowsrc >= 0) |
316 |
+ |
r->ro = source[glowsrc].so; |
317 |
+ |
else |
318 |
+ |
return(0); /* nothing usable */ |
319 |
+ |
} |
320 |
+ |
/* |
321 |
+ |
* Make assignments. |
322 |
+ |
*/ |
323 |
+ |
r->robj = objndx(r->ro); |
324 |
+ |
for (i = 0; i < 3; i++) |
325 |
+ |
r->ron[i] = -r->rdir[i]; |
326 |
+ |
r->rod = 1.0; |
327 |
+ |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
328 |
+ |
r->uv[0] = r->uv[1] = 0.0; |
329 |
+ |
r->rox = NULL; |
330 |
+ |
return(1); |
331 |
+ |
} |
332 |
+ |
|
333 |
+ |
|
334 |
+ |
static int |
335 |
+ |
cntcmp( /* contribution compare (descending) */ |
336 |
+ |
const void *p1, |
337 |
+ |
const void *p2 |
338 |
+ |
) |
339 |
+ |
{ |
340 |
+ |
register const CNTPTR *sc1 = (const CNTPTR *)p1; |
341 |
+ |
register const CNTPTR *sc2 = (const CNTPTR *)p2; |
342 |
+ |
|
343 |
|
if (sc1->brt > sc2->brt) |
344 |
|
return(-1); |
345 |
|
if (sc1->brt < sc2->brt) |
348 |
|
} |
349 |
|
|
350 |
|
|
351 |
< |
direct(r, f, p) /* add direct component */ |
352 |
< |
RAY *r; /* ray that hit surface */ |
353 |
< |
int (*f)(); /* direct component coefficient function */ |
354 |
< |
char *p; /* data for f */ |
351 |
> |
extern void |
352 |
> |
direct( /* add direct component */ |
353 |
> |
RAY *r, /* ray that hit surface */ |
354 |
> |
srcdirf_t *f, /* direct component coefficient function */ |
355 |
> |
void *p /* data for f */ |
356 |
> |
) |
357 |
|
{ |
211 |
– |
extern int (*trace)(); |
212 |
– |
extern double pow(); |
358 |
|
register int sn; |
359 |
+ |
register CONTRIB *scp; |
360 |
|
SRCINDEX si; |
361 |
|
int nshadcheck, ncnts; |
362 |
|
int nhits; |
370 |
|
for (sn = 0; srcray(&sr, r, &si); sn++) { |
371 |
|
if (sn >= maxcntr) { |
372 |
|
maxcntr = sn + MAXSPART; |
373 |
< |
srccnt = (CONTRIB *)realloc((char *)srccnt, |
373 |
> |
srccnt = (CONTRIB *)realloc((void *)srccnt, |
374 |
|
maxcntr*sizeof(CONTRIB)); |
375 |
< |
cntord = (CNTPTR *)realloc((char *)cntord, |
375 |
> |
cntord = (CNTPTR *)realloc((void *)cntord, |
376 |
|
maxcntr*sizeof(CNTPTR)); |
377 |
< |
if (srccnt == NULL | cntord == NULL) |
377 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
378 |
|
error(SYSTEM, "out of memory in direct"); |
379 |
|
} |
380 |
|
cntord[sn].sndx = sn; |
381 |
< |
srccnt[sn].sno = sr.rsrc; |
381 |
> |
scp = srccnt + sn; |
382 |
> |
scp->sno = sr.rsrc; |
383 |
|
/* compute coefficient */ |
384 |
< |
(*f)(srccnt[sn].coef, p, sr.rdir, si.dom); |
385 |
< |
cntord[sn].brt = bright(srccnt[sn].coef); |
384 |
> |
(*f)(scp->coef, p, sr.rdir, si.dom); |
385 |
> |
cntord[sn].brt = bright(scp->coef); |
386 |
|
if (cntord[sn].brt <= 0.0) |
387 |
|
continue; |
388 |
< |
VCOPY(srccnt[sn].dir, sr.rdir); |
388 |
> |
#if SHADCACHE |
389 |
> |
/* check shadow cache */ |
390 |
> |
if (si.np == 1 && srcblocked(&sr)) { |
391 |
> |
cntord[sn].brt = 0.0; |
392 |
> |
continue; |
393 |
> |
} |
394 |
> |
#endif |
395 |
> |
VCOPY(scp->dir, sr.rdir); |
396 |
> |
copycolor(sr.rcoef, scp->coef); |
397 |
|
/* compute potential */ |
398 |
|
sr.revf = srcvalue; |
399 |
|
rayvalue(&sr); |
400 |
< |
copycolor(srccnt[sn].val, sr.rcol); |
401 |
< |
multcolor(srccnt[sn].val, srccnt[sn].coef); |
402 |
< |
cntord[sn].brt = bright(srccnt[sn].val); |
400 |
> |
multcolor(sr.rcol, sr.rcoef); |
401 |
> |
copycolor(scp->val, sr.rcol); |
402 |
> |
cntord[sn].brt = bright(scp->val); |
403 |
|
} |
404 |
|
/* sort contributions */ |
405 |
|
qsort(cntord, sn, sizeof(CNTPTR), cntcmp); |
416 |
|
l = m; |
417 |
|
} |
418 |
|
} |
419 |
+ |
if (ncnts == 0) |
420 |
+ |
return; /* no contributions! */ |
421 |
|
/* accumulate tail */ |
422 |
|
for (sn = ncnts-1; sn > 0; sn--) |
423 |
|
cntord[sn-1].brt += cntord[sn].brt; |
426 |
|
/* modify threshold */ |
427 |
|
ourthresh = shadthresh / r->rweight; |
428 |
|
/* test for shadows */ |
429 |
< |
nhits = 0; |
430 |
< |
for (sn = 0; sn < ncnts; sn++) { |
429 |
> |
for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts; |
430 |
> |
hwt += (double)source[scp->sno].nhits / |
431 |
> |
(double)source[scp->sno].ntests, |
432 |
> |
sn++) { |
433 |
|
/* check threshold */ |
434 |
|
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
435 |
|
cntord[sn].brt-cntord[sn+nshadcheck].brt) |
436 |
|
< ourthresh*bright(r->rcol)) |
437 |
|
break; |
438 |
+ |
scp = srccnt + cntord[sn].sndx; |
439 |
|
/* test for hit */ |
440 |
< |
rayorigin(&sr, r, SHADOW, 1.0); |
441 |
< |
VCOPY(sr.rdir, srccnt[cntord[sn].sndx].dir); |
442 |
< |
sr.rsrc = srccnt[cntord[sn].sndx].sno; |
443 |
< |
source[sr.rsrc].ntests++; /* keep statistics */ |
440 |
> |
rayorigin(&sr, SHADOW, r, NULL); |
441 |
> |
copycolor(sr.rcoef, scp->coef); |
442 |
> |
VCOPY(sr.rdir, scp->dir); |
443 |
> |
sr.rsrc = scp->sno; |
444 |
> |
/* keep statistics */ |
445 |
> |
if (source[scp->sno].ntests++ > 0xfffffff0) { |
446 |
> |
source[scp->sno].ntests >>= 1; |
447 |
> |
source[scp->sno].nhits >>= 1; |
448 |
> |
} |
449 |
|
if (localhit(&sr, &thescene) && |
450 |
< |
( sr.ro != source[sr.rsrc].so || |
451 |
< |
source[sr.rsrc].sflags & SFOLLOW )) { |
450 |
> |
( sr.ro != source[scp->sno].so || |
451 |
> |
source[scp->sno].sflags & SFOLLOW )) { |
452 |
|
/* follow entire path */ |
453 |
|
raycont(&sr); |
454 |
|
if (trace != NULL) |
455 |
|
(*trace)(&sr); /* trace execution */ |
456 |
< |
if (bright(sr.rcol) <= FTINY) |
456 |
> |
rayparticipate(&sr); |
457 |
> |
if (bright(sr.rcol) <= FTINY) { |
458 |
> |
#if SHADCACHE |
459 |
> |
if ((scp <= srccnt || scp[-1].sno != scp->sno) |
460 |
> |
&& (scp >= srccnt+ncnts-1 || |
461 |
> |
scp[1].sno != scp->sno)) |
462 |
> |
srcblocker(&sr); |
463 |
> |
#endif |
464 |
|
continue; /* missed! */ |
465 |
< |
copycolor(srccnt[cntord[sn].sndx].val, sr.rcol); |
466 |
< |
multcolor(srccnt[cntord[sn].sndx].val, |
467 |
< |
srccnt[cntord[sn].sndx].coef); |
465 |
> |
} |
466 |
> |
multcolor(sr.rcol, sr.rcoef); |
467 |
> |
copycolor(scp->val, sr.rcol); |
468 |
> |
} else if (trace != NULL && |
469 |
> |
(source[scp->sno].sflags & (SDISTANT|SVIRTUAL|SFOLLOW)) |
470 |
> |
== (SDISTANT|SFOLLOW) && |
471 |
> |
sourcehit(&sr) && rayshade(&sr, sr.ro->omod)) { |
472 |
> |
(*trace)(&sr); /* trace execution */ |
473 |
> |
/* skip call to rayparticipate() & scp->val update */ |
474 |
|
} |
475 |
|
/* add contribution if hit */ |
476 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
476 |
> |
addcolor(r->rcol, scp->val); |
477 |
|
nhits++; |
478 |
< |
source[sr.rsrc].nhits++; |
478 |
> |
source[scp->sno].nhits++; |
479 |
|
} |
480 |
< |
/* surface hit rate */ |
481 |
< |
if (sn > 0) |
482 |
< |
hwt = (double)nhits / (double)sn; |
480 |
> |
/* source hit rate */ |
481 |
> |
if (hwt > FTINY) |
482 |
> |
hwt = (double)nhits / hwt; |
483 |
|
else |
484 |
|
hwt = 0.5; |
485 |
|
#ifdef DEBUG |
486 |
< |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
486 |
> |
sprintf(errmsg, "%d tested, %d untested, %f conditional hit rate\n", |
487 |
|
sn, ncnts-sn, hwt); |
488 |
|
eputs(errmsg); |
489 |
|
#endif |
490 |
|
/* add in untested sources */ |
491 |
|
for ( ; sn < ncnts; sn++) { |
492 |
< |
sr.rsrc = srccnt[cntord[sn].sndx].sno; |
493 |
< |
prob = hwt * (double)source[sr.rsrc].nhits / |
494 |
< |
(double)source[sr.rsrc].ntests; |
495 |
< |
scalecolor(srccnt[cntord[sn].sndx].val, prob); |
496 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
492 |
> |
scp = srccnt + cntord[sn].sndx; |
493 |
> |
prob = hwt * (double)source[scp->sno].nhits / |
494 |
> |
(double)source[scp->sno].ntests; |
495 |
> |
if (prob < 1.0) |
496 |
> |
scalecolor(scp->val, prob); |
497 |
> |
addcolor(r->rcol, scp->val); |
498 |
|
} |
499 |
+ |
} |
500 |
+ |
|
501 |
+ |
|
502 |
+ |
extern void |
503 |
+ |
srcscatter( /* compute source scattering into ray */ |
504 |
+ |
register RAY *r |
505 |
+ |
) |
506 |
+ |
{ |
507 |
+ |
int oldsampndx; |
508 |
+ |
int nsamps; |
509 |
+ |
RAY sr; |
510 |
+ |
SRCINDEX si; |
511 |
+ |
double t, d; |
512 |
+ |
double re, ge, be; |
513 |
+ |
COLOR cvext; |
514 |
+ |
int i, j; |
515 |
+ |
|
516 |
+ |
if (r->slights == NULL || r->slights[0] == 0 |
517 |
+ |
|| r->gecc >= 1.-FTINY || r->rot >= FHUGE) |
518 |
+ |
return; |
519 |
+ |
if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) |
520 |
+ |
nsamps = 1; |
521 |
+ |
#if MAXSSAMP |
522 |
+ |
else if (nsamps > MAXSSAMP) |
523 |
+ |
nsamps = MAXSSAMP; |
524 |
+ |
#endif |
525 |
+ |
oldsampndx = samplendx; |
526 |
+ |
samplendx = random()&0x7fff; /* randomize */ |
527 |
+ |
for (i = r->slights[0]; i > 0; i--) { /* for each source */ |
528 |
+ |
for (j = 0; j < nsamps; j++) { /* for each sample position */ |
529 |
+ |
samplendx++; |
530 |
+ |
t = r->rot * (j+frandom())/nsamps; |
531 |
+ |
/* extinction */ |
532 |
+ |
re = t*colval(r->cext,RED); |
533 |
+ |
ge = t*colval(r->cext,GRN); |
534 |
+ |
be = t*colval(r->cext,BLU); |
535 |
+ |
setcolor(cvext, re > 92. ? 0. : exp(-re), |
536 |
+ |
ge > 92. ? 0. : exp(-ge), |
537 |
+ |
be > 92. ? 0. : exp(-be)); |
538 |
+ |
if (intens(cvext) <= FTINY) |
539 |
+ |
break; /* too far away */ |
540 |
+ |
sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
541 |
+ |
sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
542 |
+ |
sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
543 |
+ |
sr.rmax = 0.; |
544 |
+ |
initsrcindex(&si); /* sample ray to this source */ |
545 |
+ |
si.sn = r->slights[i]; |
546 |
+ |
nopart(&si, &sr); |
547 |
+ |
if (!srcray(&sr, NULL, &si) || |
548 |
+ |
sr.rsrc != r->slights[i]) |
549 |
+ |
continue; /* no path */ |
550 |
+ |
#if SHADCACHE |
551 |
+ |
if (srcblocked(&sr)) /* check shadow cache */ |
552 |
+ |
continue; |
553 |
+ |
#endif |
554 |
+ |
copycolor(sr.cext, r->cext); |
555 |
+ |
copycolor(sr.albedo, r->albedo); |
556 |
+ |
sr.gecc = r->gecc; |
557 |
+ |
sr.slights = r->slights; |
558 |
+ |
rayvalue(&sr); /* eval. source ray */ |
559 |
+ |
if (bright(sr.rcol) <= FTINY) { |
560 |
+ |
#if SHADCACHE |
561 |
+ |
srcblocker(&sr); /* add blocker to cache */ |
562 |
+ |
#endif |
563 |
+ |
continue; |
564 |
+ |
} |
565 |
+ |
if (r->gecc <= FTINY) /* compute P(theta) */ |
566 |
+ |
d = 1.; |
567 |
+ |
else { |
568 |
+ |
d = DOT(r->rdir, sr.rdir); |
569 |
+ |
d = 1. + r->gecc*r->gecc - 2.*r->gecc*d; |
570 |
+ |
d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); |
571 |
+ |
} |
572 |
+ |
/* other factors */ |
573 |
+ |
d *= si.dom * r->rot / (4.*PI*nsamps); |
574 |
+ |
multcolor(sr.rcol, r->cext); |
575 |
+ |
multcolor(sr.rcol, r->albedo); |
576 |
+ |
scalecolor(sr.rcol, d); |
577 |
+ |
multcolor(sr.rcol, cvext); |
578 |
+ |
addcolor(r->rcol, sr.rcol); /* add it in */ |
579 |
+ |
} |
580 |
+ |
} |
581 |
+ |
samplendx = oldsampndx; |
582 |
+ |
} |
583 |
+ |
|
584 |
+ |
|
585 |
+ |
/**************************************************************** |
586 |
+ |
* The following macros were separated from the m_light() routine |
587 |
+ |
* because they are very nasty and difficult to understand. |
588 |
+ |
*/ |
589 |
+ |
|
590 |
+ |
/* illumblock * |
591 |
+ |
* |
592 |
+ |
* We cannot allow an illum to pass to another illum, because that |
593 |
+ |
* would almost certainly constitute overcounting. |
594 |
+ |
* However, we do allow an illum to pass to another illum |
595 |
+ |
* that is actually going to relay to a virtual light source. |
596 |
+ |
* We also prevent an illum from passing to a glow; this provides a |
597 |
+ |
* convenient mechanism for defining detailed light source |
598 |
+ |
* geometry behind (or inside) an effective radiator. |
599 |
+ |
*/ |
600 |
+ |
|
601 |
+ |
static int |
602 |
+ |
weaksrcmat(OBJECT obj) /* identify material */ |
603 |
+ |
{ |
604 |
+ |
OBJREC *m = findmaterial(objptr(obj)); |
605 |
+ |
|
606 |
+ |
if (m == NULL) return(0); |
607 |
+ |
return((m->otype==MAT_ILLUM) | (m->otype==MAT_GLOW)); |
608 |
+ |
} |
609 |
+ |
|
610 |
+ |
#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
611 |
+ |
r->rod > 0.0 && \ |
612 |
+ |
weaksrcmat(source[r->rsrc].so->omod)) |
613 |
+ |
|
614 |
+ |
/* wrongsource * |
615 |
+ |
* |
616 |
+ |
* This source is the wrong source (ie. overcounted) if we are |
617 |
+ |
* aimed to a different source than the one we hit and the one |
618 |
+ |
* we hit is not an illum that should be passed. |
619 |
+ |
*/ |
620 |
+ |
|
621 |
+ |
#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
622 |
+ |
(m->otype!=MAT_ILLUM || illumblock(m,r))) |
623 |
+ |
|
624 |
+ |
/* distglow * |
625 |
+ |
* |
626 |
+ |
* A distant glow is an object that sometimes acts as a light source, |
627 |
+ |
* but is too far away from the test point to be one in this case. |
628 |
+ |
* (Glows with negative radii should NEVER participate in illumination.) |
629 |
+ |
*/ |
630 |
+ |
|
631 |
+ |
#define distglow(m, r, d) (m->otype==MAT_GLOW && \ |
632 |
+ |
m->oargs.farg[3] >= -FTINY && \ |
633 |
+ |
d > m->oargs.farg[3]) |
634 |
+ |
|
635 |
+ |
/* badcomponent * |
636 |
+ |
* |
637 |
+ |
* We must avoid counting light sources in the ambient calculation, |
638 |
+ |
* since the direct component is handled separately. Therefore, any |
639 |
+ |
* ambient ray which hits an active light source must be discarded. |
640 |
+ |
* The same is true for stray specular samples, since the specular |
641 |
+ |
* contribution from light sources is calculated separately. |
642 |
+ |
*/ |
643 |
+ |
|
644 |
+ |
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
645 |
+ |
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
646 |
+ |
/* not 100% correct */ distglow(m, r, r->rot))) |
647 |
+ |
|
648 |
+ |
/* passillum * |
649 |
+ |
* |
650 |
+ |
* An illum passes to another material type when we didn't hit it |
651 |
+ |
* on purpose (as part of a direct calculation), or it is relaying |
652 |
+ |
* a virtual light source. |
653 |
+ |
*/ |
654 |
+ |
|
655 |
+ |
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
656 |
+ |
(r->rsrc<0 || source[r->rsrc].so!=r->ro || \ |
657 |
+ |
source[r->rsrc].sflags&SVIRTUAL)) |
658 |
+ |
|
659 |
+ |
/* srcignore * |
660 |
+ |
* |
661 |
+ |
* The -dv flag is normally on for sources to be visible. |
662 |
+ |
*/ |
663 |
+ |
|
664 |
+ |
#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
665 |
+ |
distglow(m, r, raydist(r,PRIMARY))) |
666 |
+ |
|
667 |
+ |
|
668 |
+ |
extern int |
669 |
+ |
m_light( /* ray hit a light source */ |
670 |
+ |
register OBJREC *m, |
671 |
+ |
register RAY *r |
672 |
+ |
) |
673 |
+ |
{ |
674 |
+ |
/* check for over-counting */ |
675 |
+ |
if (badcomponent(m, r)) { |
676 |
+ |
setcolor(r->rcoef, 0.0, 0.0, 0.0); |
677 |
+ |
return(1); |
678 |
+ |
} |
679 |
+ |
if (wrongsource(m, r)) { |
680 |
+ |
setcolor(r->rcoef, 0.0, 0.0, 0.0); |
681 |
+ |
return(1); |
682 |
+ |
} |
683 |
+ |
/* check for passed illum */ |
684 |
+ |
if (passillum(m, r)) { |
685 |
+ |
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
686 |
+ |
return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); |
687 |
+ |
raytrans(r); |
688 |
+ |
return(1); |
689 |
+ |
} |
690 |
+ |
/* check for invisibility */ |
691 |
+ |
if (srcignore(m, r)) { |
692 |
+ |
setcolor(r->rcoef, 0.0, 0.0, 0.0); |
693 |
+ |
return(1); |
694 |
+ |
} |
695 |
+ |
/* otherwise treat as source */ |
696 |
+ |
/* check for behind */ |
697 |
+ |
if (r->rod < 0.0) |
698 |
+ |
return(1); |
699 |
+ |
/* check for outside spot */ |
700 |
+ |
if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |
701 |
+ |
return(1); |
702 |
+ |
/* get distribution pattern */ |
703 |
+ |
raytexture(r, m->omod); |
704 |
+ |
/* get source color */ |
705 |
+ |
setcolor(r->rcol, m->oargs.farg[0], |
706 |
+ |
m->oargs.farg[1], |
707 |
+ |
m->oargs.farg[2]); |
708 |
+ |
/* modify value */ |
709 |
+ |
multcolor(r->rcol, r->pcol); |
710 |
+ |
return(1); |
711 |
|
} |