1 |
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/* Copyright (c) 1995 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 |
|
* |
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 |
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#include "otypes.h" |
12 |
< |
|
12 |
> |
#include "rtotypes.h" |
13 |
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#include "source.h" |
20 |
– |
|
14 |
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#include "random.h" |
15 |
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|
16 |
< |
extern double ssampdist; /* scatter sampling distance */ |
16 |
> |
#ifndef MAXSSAMP |
17 |
> |
#define MAXSSAMP 16 /* maximum samples per ray */ |
18 |
> |
#endif |
19 |
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|
20 |
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/* |
21 |
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* Structures used by direct() |
37 |
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static CNTPTR *cntord; /* source ordering in direct() */ |
38 |
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static int maxcntr = 0; /* size of contribution arrays */ |
39 |
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|
40 |
+ |
static int cntcmp(const void *p1, const void *p2); |
41 |
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|
42 |
< |
marksources() /* find and mark source objects */ |
42 |
> |
|
43 |
> |
OBJREC * /* find an object's actual material */ |
44 |
> |
findmaterial(OBJREC *o) |
45 |
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{ |
46 |
+ |
while (!ismaterial(o->otype)) { |
47 |
+ |
if (o->otype == MOD_ALIAS && o->oargs.nsargs) { |
48 |
+ |
OBJECT aobj; |
49 |
+ |
OBJREC *ao; |
50 |
+ |
aobj = lastmod(objndx(o), o->oargs.sarg[0]); |
51 |
+ |
if (aobj < 0) |
52 |
+ |
objerror(o, USER, "bad reference"); |
53 |
+ |
ao = objptr(aobj); |
54 |
+ |
if (ismaterial(ao->otype)) |
55 |
+ |
return(ao); |
56 |
+ |
if (ao->otype == MOD_ALIAS) { |
57 |
+ |
o = ao; |
58 |
+ |
continue; |
59 |
+ |
} |
60 |
+ |
} |
61 |
+ |
if (o->omod == OVOID) |
62 |
+ |
return(NULL); |
63 |
+ |
o = objptr(o->omod); |
64 |
+ |
} |
65 |
+ |
return(o); /* mixtures will return NULL */ |
66 |
+ |
} |
67 |
+ |
|
68 |
+ |
|
69 |
+ |
void |
70 |
+ |
marksources(void) /* find and mark source objects */ |
71 |
+ |
{ |
72 |
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int foundsource = 0; |
73 |
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int i; |
74 |
< |
register OBJREC *o, *m; |
75 |
< |
register int ns; |
74 |
> |
OBJREC *o, *m; |
75 |
> |
int ns; |
76 |
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/* initialize dispatch table */ |
77 |
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initstypes(); |
78 |
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/* find direct sources */ |
79 |
< |
for (i = 0; i < nobjects; i++) { |
79 |
> |
for (i = 0; i < nsceneobjs; i++) { |
80 |
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|
81 |
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o = objptr(i); |
82 |
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|
83 |
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if (!issurface(o->otype) || o->omod == OVOID) |
84 |
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continue; |
85 |
< |
|
86 |
< |
m = objptr(o->omod); |
87 |
< |
|
64 |
< |
if (!islight(m->otype)) |
85 |
> |
/* find material */ |
86 |
> |
m = findmaterial(objptr(o->omod)); |
87 |
> |
if (m == NULL) |
88 |
|
continue; |
89 |
+ |
if (m->otype == MAT_CLIP) { |
90 |
+ |
markclip(m); /* special case for antimatter */ |
91 |
+ |
continue; |
92 |
+ |
} |
93 |
+ |
if (!islight(m->otype)) |
94 |
+ |
continue; /* not source modifier */ |
95 |
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|
96 |
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if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 : |
97 |
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m->otype == MAT_SPOT ? 7 : 3)) |
98 |
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objerror(m, USER, "bad # arguments"); |
99 |
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|
71 |
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if (m->otype == MAT_GLOW && |
72 |
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o->otype != OBJ_SOURCE && |
73 |
– |
m->oargs.farg[3] <= FTINY) |
74 |
– |
continue; /* don't bother */ |
100 |
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if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY && |
101 |
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m->oargs.farg[2] <= FTINY) |
102 |
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continue; /* don't bother */ |
103 |
< |
|
103 |
> |
if (m->otype == MAT_GLOW && |
104 |
> |
o->otype != OBJ_SOURCE && |
105 |
> |
m->oargs.farg[3] <= FTINY) { |
106 |
> |
foundsource += (ambounce > 0); |
107 |
> |
continue; /* don't track these */ |
108 |
> |
} |
109 |
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if (sfun[o->otype].of == NULL || |
110 |
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sfun[o->otype].of->setsrc == NULL) |
111 |
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objerror(o, USER, "illegal material"); |
118 |
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if (m->otype == MAT_GLOW) { |
119 |
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source[ns].sflags |= SPROX; |
120 |
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source[ns].sl.prox = m->oargs.farg[3]; |
121 |
< |
if (source[ns].sflags & SDISTANT) |
121 |
> |
if (source[ns].sflags & SDISTANT) { |
122 |
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source[ns].sflags |= SSKIP; |
123 |
+ |
foundsource += (ambounce > 0); |
124 |
+ |
} |
125 |
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} else if (m->otype == MAT_SPOT) { |
126 |
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source[ns].sflags |= SSPOT; |
127 |
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if ((source[ns].sl.s = makespot(m)) == NULL) |
133 |
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source[ns].sflags |= SSKIP; |
134 |
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} |
135 |
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} |
136 |
< |
if (!(source[ns].sflags & SSKIP)) |
137 |
< |
foundsource++; |
136 |
> |
#if SHADCACHE |
137 |
> |
initobscache(ns); |
138 |
> |
#endif |
139 |
> |
foundsource += !(source[ns].sflags & SSKIP); |
140 |
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} |
141 |
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if (!foundsource) { |
142 |
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error(WARNING, "no light sources found"); |
147 |
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maxcntr = nsources + MAXSPART; /* start with this many */ |
148 |
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srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
149 |
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cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
150 |
< |
if (srccnt == NULL | cntord == NULL) |
150 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
151 |
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goto memerr; |
152 |
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return; |
153 |
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memerr: |
155 |
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} |
156 |
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|
157 |
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|
158 |
< |
srcray(sr, r, si) /* send a ray to a source, return domega */ |
159 |
< |
register RAY *sr; /* returned source ray */ |
126 |
< |
RAY *r; /* ray which hit object */ |
127 |
< |
SRCINDEX *si; /* source sample index */ |
158 |
> |
void |
159 |
> |
freesources(void) /* free all source structures */ |
160 |
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{ |
161 |
< |
double d; /* distance to source */ |
162 |
< |
register SRCREC *srcp; |
161 |
> |
if (nsources > 0) { |
162 |
> |
#if SHADCACHE |
163 |
> |
while (nsources--) |
164 |
> |
freeobscache(&source[nsources]); |
165 |
> |
#endif |
166 |
> |
free((void *)source); |
167 |
> |
source = NULL; |
168 |
> |
nsources = 0; |
169 |
> |
} |
170 |
> |
markclip(NULL); |
171 |
> |
if (maxcntr <= 0) |
172 |
> |
return; |
173 |
> |
free((void *)srccnt); |
174 |
> |
srccnt = NULL; |
175 |
> |
free((void *)cntord); |
176 |
> |
cntord = NULL; |
177 |
> |
maxcntr = 0; |
178 |
> |
} |
179 |
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|
132 |
– |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
180 |
|
|
181 |
< |
while ((d = nextssamp(sr, si)) != 0.0) { |
182 |
< |
sr->rsrc = si->sn; /* remember source */ |
183 |
< |
srcp = source + si->sn; |
184 |
< |
if (srcp->sflags & SDISTANT) { |
185 |
< |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
186 |
< |
continue; |
187 |
< |
return(1); /* sample OK */ |
188 |
< |
} |
181 |
> |
int |
182 |
> |
srcray( /* send a ray to a source, return domega */ |
183 |
> |
RAY *sr, /* returned source ray */ |
184 |
> |
RAY *r, /* ray which hit object */ |
185 |
> |
SRCINDEX *si /* source sample index */ |
186 |
> |
) |
187 |
> |
{ |
188 |
> |
double d; /* distance to source */ |
189 |
> |
SRCREC *srcp; |
190 |
> |
|
191 |
> |
rayorigin(sr, SHADOW, r, NULL); /* ignore limits */ |
192 |
> |
|
193 |
> |
if (r == NULL) |
194 |
> |
sr->rmax = 0.0; |
195 |
> |
|
196 |
> |
while ((d = nextssamp(sr, si)) != 0.0) { |
197 |
> |
sr->rsrc = si->sn; /* remember source */ |
198 |
> |
srcp = source + si->sn; |
199 |
> |
if (srcp->sflags & SDISTANT) { |
200 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
201 |
> |
continue; |
202 |
> |
return(1); /* sample OK */ |
203 |
> |
} |
204 |
|
/* local source */ |
205 |
|
/* check proximity */ |
206 |
< |
if (srcp->sflags & SPROX && d > srcp->sl.prox) |
145 |
< |
continue; |
146 |
< |
/* check angle */ |
147 |
< |
if (srcp->sflags & SSPOT) { |
148 |
< |
if (spotout(sr, srcp->sl.s)) |
206 |
> |
if (srcp->sflags & SPROX && d > srcp->sl.prox) |
207 |
|
continue; |
208 |
+ |
/* check angle */ |
209 |
+ |
if (srcp->sflags & SSPOT) { |
210 |
+ |
if (spotout(sr, srcp->sl.s)) |
211 |
+ |
continue; |
212 |
|
/* adjust solid angle */ |
213 |
< |
si->dom *= d*d; |
214 |
< |
d += srcp->sl.s->flen; |
215 |
< |
si->dom /= d*d; |
213 |
> |
si->dom *= d*d; |
214 |
> |
d += srcp->sl.s->flen; |
215 |
> |
si->dom /= d*d; |
216 |
> |
} |
217 |
> |
return(1); /* sample OK */ |
218 |
|
} |
219 |
< |
return(1); /* sample OK */ |
156 |
< |
} |
157 |
< |
return(0); /* no more samples */ |
219 |
> |
return(0); /* no more samples */ |
220 |
|
} |
221 |
|
|
222 |
|
|
223 |
< |
srcvalue(r) /* punch ray to source and compute value */ |
224 |
< |
register RAY *r; |
223 |
> |
void |
224 |
> |
srcvalue( /* punch ray to source and compute value */ |
225 |
> |
RAY *r |
226 |
> |
) |
227 |
|
{ |
228 |
< |
register SRCREC *sp; |
228 |
> |
SRCREC *sp; |
229 |
|
|
230 |
|
sp = &source[r->rsrc]; |
231 |
|
if (sp->sflags & SVIRTUAL) { /* virtual source */ |
262 |
|
} |
263 |
|
|
264 |
|
|
265 |
< |
sourcehit(r) /* check to see if ray hit distant source */ |
266 |
< |
register RAY *r; |
265 |
> |
static int |
266 |
> |
transillum( /* check if material is transparent illum */ |
267 |
> |
OBJECT obj |
268 |
> |
) |
269 |
|
{ |
270 |
+ |
OBJREC *m = findmaterial(objptr(obj)); |
271 |
+ |
|
272 |
+ |
if (m == NULL) |
273 |
+ |
return(1); |
274 |
+ |
if (m->otype != MAT_ILLUM) |
275 |
+ |
return(0); |
276 |
+ |
return(!m->oargs.nsargs || !strcmp(m->oargs.sarg[0], VOIDID)); |
277 |
+ |
} |
278 |
+ |
|
279 |
+ |
|
280 |
+ |
int |
281 |
+ |
sourcehit( /* check to see if ray hit distant source */ |
282 |
+ |
RAY *r |
283 |
+ |
) |
284 |
+ |
{ |
285 |
+ |
int glowsrc = -1; |
286 |
+ |
int transrc = -1; |
287 |
|
int first, last; |
288 |
< |
register int i; |
288 |
> |
int i; |
289 |
|
|
290 |
|
if (r->rsrc >= 0) { /* check only one if aimed */ |
291 |
|
first = last = r->rsrc; |
292 |
|
} else { /* otherwise check all */ |
293 |
|
first = 0; last = nsources-1; |
294 |
|
} |
295 |
< |
for (i = first; i <= last; i++) |
296 |
< |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
297 |
< |
/* |
298 |
< |
* Check to see if ray is within |
299 |
< |
* solid angle of source. |
300 |
< |
*/ |
301 |
< |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
302 |
< |
<= source[i].ss2) { |
303 |
< |
r->ro = source[i].so; |
304 |
< |
if (!(source[i].sflags & SSKIP)) |
305 |
< |
break; |
306 |
< |
} |
307 |
< |
|
308 |
< |
if (r->ro != NULL) { |
309 |
< |
for (i = 0; i < 3; i++) |
310 |
< |
r->ron[i] = -r->rdir[i]; |
311 |
< |
r->rod = 1.0; |
312 |
< |
r->rox = NULL; |
313 |
< |
return(1); |
295 |
> |
for (i = first; i <= last; i++) { |
296 |
> |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) != SDISTANT) |
297 |
> |
continue; |
298 |
> |
/* |
299 |
> |
* Check to see if ray is within |
300 |
> |
* solid angle of source. |
301 |
> |
*/ |
302 |
> |
if (2.*PI*(1. - DOT(source[i].sloc,r->rdir)) > source[i].ss2) |
303 |
> |
continue; |
304 |
> |
/* is it the only possibility? */ |
305 |
> |
if (first == last) { |
306 |
> |
r->ro = source[i].so; |
307 |
> |
break; |
308 |
> |
} |
309 |
> |
/* |
310 |
> |
* If it's a glow or transparent illum, just remember it. |
311 |
> |
*/ |
312 |
> |
if (source[i].sflags & SSKIP) { |
313 |
> |
if (glowsrc < 0) |
314 |
> |
glowsrc = i; |
315 |
> |
continue; |
316 |
> |
} |
317 |
> |
if (transillum(source[i].so->omod)) { |
318 |
> |
if (transrc < 0) |
319 |
> |
transrc = i; |
320 |
> |
continue; |
321 |
> |
} |
322 |
> |
r->ro = source[i].so; /* otherwise, use first hit */ |
323 |
> |
break; |
324 |
|
} |
325 |
< |
return(0); |
325 |
> |
/* |
326 |
> |
* Do we need fallback? |
327 |
> |
*/ |
328 |
> |
if (r->ro == NULL) { |
329 |
> |
if (transrc >= 0 && r->crtype & (AMBIENT|SPECULAR)) |
330 |
> |
return(0); /* avoid overcounting */ |
331 |
> |
if (glowsrc >= 0) |
332 |
> |
r->ro = source[glowsrc].so; |
333 |
> |
else |
334 |
> |
return(0); /* nothing usable */ |
335 |
> |
} |
336 |
> |
/* |
337 |
> |
* Make assignments. |
338 |
> |
*/ |
339 |
> |
r->robj = objndx(r->ro); |
340 |
> |
for (i = 0; i < 3; i++) |
341 |
> |
r->ron[i] = -r->rdir[i]; |
342 |
> |
r->rod = 1.0; |
343 |
> |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
344 |
> |
r->uv[0] = r->uv[1] = 0.0; |
345 |
> |
r->rox = NULL; |
346 |
> |
return(1); |
347 |
|
} |
348 |
|
|
349 |
|
|
350 |
|
static int |
351 |
< |
cntcmp(sc1, sc2) /* contribution compare (descending) */ |
352 |
< |
register CNTPTR *sc1, *sc2; |
351 |
> |
cntcmp( /* contribution compare (descending) */ |
352 |
> |
const void *p1, |
353 |
> |
const void *p2 |
354 |
> |
) |
355 |
|
{ |
356 |
+ |
const CNTPTR *sc1 = (const CNTPTR *)p1; |
357 |
+ |
const CNTPTR *sc2 = (const CNTPTR *)p2; |
358 |
+ |
|
359 |
|
if (sc1->brt > sc2->brt) |
360 |
|
return(-1); |
361 |
|
if (sc1->brt < sc2->brt) |
364 |
|
} |
365 |
|
|
366 |
|
|
367 |
< |
direct(r, f, p) /* add direct component */ |
368 |
< |
RAY *r; /* ray that hit surface */ |
369 |
< |
int (*f)(); /* direct component coefficient function */ |
370 |
< |
char *p; /* data for f */ |
367 |
> |
void |
368 |
> |
direct( /* add direct component */ |
369 |
> |
RAY *r, /* ray that hit surface */ |
370 |
> |
srcdirf_t *f, /* direct component coefficient function */ |
371 |
> |
void *p /* data for f */ |
372 |
> |
) |
373 |
|
{ |
374 |
< |
extern int (*trace)(); |
375 |
< |
register int sn; |
255 |
< |
register CONTRIB *scp; |
374 |
> |
int sn; |
375 |
> |
CONTRIB *scp; |
376 |
|
SRCINDEX si; |
377 |
|
int nshadcheck, ncnts; |
378 |
|
int nhits; |
386 |
|
for (sn = 0; srcray(&sr, r, &si); sn++) { |
387 |
|
if (sn >= maxcntr) { |
388 |
|
maxcntr = sn + MAXSPART; |
389 |
< |
srccnt = (CONTRIB *)realloc((char *)srccnt, |
389 |
> |
srccnt = (CONTRIB *)realloc((void *)srccnt, |
390 |
|
maxcntr*sizeof(CONTRIB)); |
391 |
< |
cntord = (CNTPTR *)realloc((char *)cntord, |
391 |
> |
cntord = (CNTPTR *)realloc((void *)cntord, |
392 |
|
maxcntr*sizeof(CNTPTR)); |
393 |
< |
if (srccnt == NULL | cntord == NULL) |
393 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
394 |
|
error(SYSTEM, "out of memory in direct"); |
395 |
|
} |
396 |
|
cntord[sn].sndx = sn; |
398 |
|
scp->sno = sr.rsrc; |
399 |
|
/* compute coefficient */ |
400 |
|
(*f)(scp->coef, p, sr.rdir, si.dom); |
401 |
< |
cntord[sn].brt = bright(scp->coef); |
401 |
> |
cntord[sn].brt = intens(scp->coef); |
402 |
|
if (cntord[sn].brt <= 0.0) |
403 |
|
continue; |
404 |
+ |
#if SHADCACHE |
405 |
+ |
/* check shadow cache */ |
406 |
+ |
if (si.np == 1 && srcblocked(&sr)) { |
407 |
+ |
cntord[sn].brt = 0.0; |
408 |
+ |
continue; |
409 |
+ |
} |
410 |
+ |
#endif |
411 |
|
VCOPY(scp->dir, sr.rdir); |
412 |
+ |
copycolor(sr.rcoef, scp->coef); |
413 |
|
/* compute potential */ |
414 |
|
sr.revf = srcvalue; |
415 |
|
rayvalue(&sr); |
416 |
+ |
multcolor(sr.rcol, sr.rcoef); |
417 |
|
copycolor(scp->val, sr.rcol); |
418 |
< |
multcolor(scp->val, scp->coef); |
290 |
< |
cntord[sn].brt = bright(scp->val); |
418 |
> |
cntord[sn].brt = bright(sr.rcol); |
419 |
|
} |
420 |
|
/* sort contributions */ |
421 |
|
qsort(cntord, sn, sizeof(CNTPTR), cntcmp); |
422 |
|
{ /* find last */ |
423 |
< |
register int l, m; |
423 |
> |
int l, m; |
424 |
|
|
425 |
|
ncnts = l = sn; |
426 |
|
sn = 0; |
440 |
|
/* compute number to check */ |
441 |
|
nshadcheck = pow((double)ncnts, shadcert) + .5; |
442 |
|
/* modify threshold */ |
443 |
< |
ourthresh = shadthresh / r->rweight; |
443 |
> |
if (ncnts > MINSHADCNT) |
444 |
> |
ourthresh = shadthresh / r->rweight; |
445 |
> |
else |
446 |
> |
ourthresh = 0; |
447 |
|
/* test for shadows */ |
448 |
|
for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts; |
449 |
|
hwt += (double)source[scp->sno].nhits / |
456 |
|
break; |
457 |
|
scp = srccnt + cntord[sn].sndx; |
458 |
|
/* test for hit */ |
459 |
< |
rayorigin(&sr, r, SHADOW, 1.0); |
459 |
> |
rayorigin(&sr, SHADOW, r, NULL); |
460 |
> |
copycolor(sr.rcoef, scp->coef); |
461 |
|
VCOPY(sr.rdir, scp->dir); |
462 |
|
sr.rsrc = scp->sno; |
463 |
< |
source[scp->sno].ntests++; /* keep statistics */ |
463 |
> |
/* keep statistics */ |
464 |
> |
if (source[scp->sno].ntests++ > 0xfffffff0) { |
465 |
> |
source[scp->sno].ntests >>= 1; |
466 |
> |
source[scp->sno].nhits >>= 1; |
467 |
> |
} |
468 |
|
if (localhit(&sr, &thescene) && |
469 |
|
( sr.ro != source[scp->sno].so || |
470 |
|
source[scp->sno].sflags & SFOLLOW )) { |
471 |
|
/* follow entire path */ |
472 |
< |
if (!raycont(&sr)) |
337 |
< |
objerror(sr.ro, USER, "material not found"); |
338 |
< |
rayparticipate(&sr); |
472 |
> |
raycont(&sr); |
473 |
|
if (trace != NULL) |
474 |
|
(*trace)(&sr); /* trace execution */ |
475 |
< |
if (bright(sr.rcol) <= FTINY) |
475 |
> |
if (bright(sr.rcol) <= FTINY) { |
476 |
> |
#if SHADCACHE |
477 |
> |
if ((scp <= srccnt || scp[-1].sno != scp->sno) |
478 |
> |
&& (scp >= srccnt+ncnts-1 || |
479 |
> |
scp[1].sno != scp->sno)) |
480 |
> |
srcblocker(&sr); |
481 |
> |
#endif |
482 |
|
continue; /* missed! */ |
483 |
+ |
} |
484 |
+ |
rayparticipate(&sr); |
485 |
+ |
multcolor(sr.rcol, sr.rcoef); |
486 |
|
copycolor(scp->val, sr.rcol); |
487 |
< |
multcolor(scp->val, scp->coef); |
487 |
> |
} else if (trace != NULL && |
488 |
> |
(source[scp->sno].sflags & (SDISTANT|SVIRTUAL|SFOLLOW)) |
489 |
> |
== (SDISTANT|SFOLLOW) && |
490 |
> |
sourcehit(&sr) && rayshade(&sr, sr.ro->omod)) { |
491 |
> |
(*trace)(&sr); /* trace execution */ |
492 |
> |
/* skip call to rayparticipate() & scp->val update */ |
493 |
|
} |
494 |
|
/* add contribution if hit */ |
495 |
|
addcolor(r->rcol, scp->val); |
511 |
|
scp = srccnt + cntord[sn].sndx; |
512 |
|
prob = hwt * (double)source[scp->sno].nhits / |
513 |
|
(double)source[scp->sno].ntests; |
514 |
< |
if (prob > 1.0) |
515 |
< |
prob = 1.0; |
368 |
< |
scalecolor(scp->val, prob); |
514 |
> |
if (prob < 1.0) |
515 |
> |
scalecolor(scp->val, prob); |
516 |
|
addcolor(r->rcol, scp->val); |
517 |
|
} |
518 |
|
} |
519 |
|
|
520 |
|
|
521 |
< |
srcscatter(r) /* compute source scattering into ray */ |
522 |
< |
register RAY *r; |
521 |
> |
void |
522 |
> |
srcscatter( /* compute source scattering into ray */ |
523 |
> |
RAY *r |
524 |
> |
) |
525 |
|
{ |
526 |
|
int oldsampndx; |
527 |
|
int nsamps; |
528 |
|
RAY sr; |
529 |
|
SRCINDEX si; |
530 |
< |
double t, lastt, d; |
531 |
< |
COLOR cumval, ctmp; |
530 |
> |
double t, d; |
531 |
> |
double re, ge, be; |
532 |
> |
COLOR cvext; |
533 |
|
int i, j; |
534 |
|
|
535 |
< |
if (r->slights == NULL || r->slights[0] == 0 || r->gecc >= 1.-FTINY) |
535 |
> |
if (r->slights == NULL || r->slights[0] == 0 |
536 |
> |
|| r->gecc >= 1.-FTINY || r->rot >= FHUGE) |
537 |
|
return; |
538 |
|
if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) |
539 |
|
nsamps = 1; |
540 |
+ |
#if MAXSSAMP |
541 |
+ |
else if (nsamps > MAXSSAMP) |
542 |
+ |
nsamps = MAXSSAMP; |
543 |
+ |
#endif |
544 |
|
oldsampndx = samplendx; |
545 |
|
samplendx = random()&0x7fff; /* randomize */ |
546 |
|
for (i = r->slights[0]; i > 0; i--) { /* for each source */ |
547 |
< |
setcolor(cumval, 0., 0., 0.); |
393 |
< |
lastt = r->rot; |
394 |
< |
for (j = nsamps; j-- > 0; ) { /* for each sample position */ |
547 |
> |
for (j = 0; j < nsamps; j++) { /* for each sample position */ |
548 |
|
samplendx++; |
549 |
|
t = r->rot * (j+frandom())/nsamps; |
550 |
+ |
/* extinction */ |
551 |
+ |
re = t*colval(r->cext,RED); |
552 |
+ |
ge = t*colval(r->cext,GRN); |
553 |
+ |
be = t*colval(r->cext,BLU); |
554 |
+ |
setcolor(cvext, re > 92. ? 0. : exp(-re), |
555 |
+ |
ge > 92. ? 0. : exp(-ge), |
556 |
+ |
be > 92. ? 0. : exp(-be)); |
557 |
+ |
if (intens(cvext) <= FTINY) |
558 |
+ |
break; /* too far away */ |
559 |
|
sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
560 |
|
sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
561 |
|
sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
400 |
– |
sr.rmax = 0.; |
562 |
|
initsrcindex(&si); /* sample ray to this source */ |
563 |
|
si.sn = r->slights[i]; |
564 |
|
nopart(&si, &sr); |
565 |
|
if (!srcray(&sr, NULL, &si) || |
566 |
|
sr.rsrc != r->slights[i]) |
567 |
|
continue; /* no path */ |
568 |
+ |
#if SHADCACHE |
569 |
+ |
if (srcblocked(&sr)) /* check shadow cache */ |
570 |
+ |
continue; |
571 |
+ |
#endif |
572 |
|
copycolor(sr.cext, r->cext); |
573 |
< |
sr.albedo = r->albedo; |
573 |
> |
copycolor(sr.albedo, r->albedo); |
574 |
|
sr.gecc = r->gecc; |
575 |
+ |
sr.slights = r->slights; |
576 |
|
rayvalue(&sr); /* eval. source ray */ |
577 |
< |
if (bright(sr.rcol) <= FTINY) |
577 |
> |
if (bright(sr.rcol) <= FTINY) { |
578 |
> |
#if SHADCACHE |
579 |
> |
srcblocker(&sr); /* add blocker to cache */ |
580 |
> |
#endif |
581 |
|
continue; |
582 |
< |
/* compute fall-off */ |
414 |
< |
d = lastt - t; |
415 |
< |
setcolor(ctmp, 1.-d*colval(r->cext,RED), |
416 |
< |
1.-d*colval(r->cext,GRN), |
417 |
< |
1.-d*colval(r->cext,BLU)); |
418 |
< |
multcolor(cumval, ctmp); |
419 |
< |
lastt = t; |
582 |
> |
} |
583 |
|
if (r->gecc <= FTINY) /* compute P(theta) */ |
584 |
|
d = 1.; |
585 |
|
else { |
586 |
|
d = DOT(r->rdir, sr.rdir); |
587 |
< |
d = sqrt(1. + r->gecc*r->gecc - 2.*r->gecc*d); |
588 |
< |
d = (1. - r->gecc*r->gecc) / (d*d*d); |
587 |
> |
d = 1. + r->gecc*r->gecc - 2.*r->gecc*d; |
588 |
> |
d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); |
589 |
|
} |
590 |
|
/* other factors */ |
591 |
< |
d *= si.dom * r->albedo * r->rot / (4.*PI*nsamps); |
591 |
> |
d *= si.dom * r->rot / (4.*PI*nsamps); |
592 |
|
multcolor(sr.rcol, r->cext); |
593 |
+ |
multcolor(sr.rcol, r->albedo); |
594 |
|
scalecolor(sr.rcol, d); |
595 |
< |
addcolor(cumval, sr.rcol); |
595 |
> |
multcolor(sr.rcol, cvext); |
596 |
> |
addcolor(r->rcol, sr.rcol); /* add it in */ |
597 |
|
} |
433 |
– |
/* final fall-off */ |
434 |
– |
setcolor(ctmp, 1.-lastt*colval(r->cext,RED), |
435 |
– |
1.-lastt*colval(r->cext,GRN), |
436 |
– |
1.-lastt*colval(r->cext,BLU)); |
437 |
– |
multcolor(cumval, ctmp); |
438 |
– |
addcolor(r->rcol, cumval); /* sum into ray result */ |
598 |
|
} |
599 |
|
samplendx = oldsampndx; |
600 |
|
} |
616 |
|
* geometry behind (or inside) an effective radiator. |
617 |
|
*/ |
618 |
|
|
619 |
< |
static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
620 |
< |
{register OBJREC *o = objptr(obj); |
621 |
< |
return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
619 |
> |
static int |
620 |
> |
weaksrcmat(OBJECT obj) /* identify material */ |
621 |
> |
{ |
622 |
> |
OBJREC *m = findmaterial(objptr(obj)); |
623 |
> |
|
624 |
> |
if (m == NULL) return(0); |
625 |
> |
return((m->otype==MAT_ILLUM) | (m->otype==MAT_GLOW)); |
626 |
> |
} |
627 |
|
|
628 |
|
#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
629 |
|
r->rod > 0.0 && \ |
630 |
< |
weaksrcmod(source[r->rsrc].so->omod)) |
630 |
> |
weaksrcmat(source[r->rsrc].so->omod)) |
631 |
|
|
632 |
|
/* wrongsource * |
633 |
|
* |
683 |
|
distglow(m, r, raydist(r,PRIMARY))) |
684 |
|
|
685 |
|
|
686 |
< |
m_light(m, r) /* ray hit a light source */ |
687 |
< |
register OBJREC *m; |
688 |
< |
register RAY *r; |
686 |
> |
int |
687 |
> |
m_light( /* ray hit a light source */ |
688 |
> |
OBJREC *m, |
689 |
> |
RAY *r |
690 |
> |
) |
691 |
|
{ |
692 |
|
/* check for over-counting */ |
693 |
< |
if (badcomponent(m, r)) |
693 |
> |
if (badcomponent(m, r)) { |
694 |
> |
setcolor(r->rcoef, 0.0, 0.0, 0.0); |
695 |
|
return(1); |
696 |
< |
if (wrongsource(m, r)) |
696 |
> |
} |
697 |
> |
if (wrongsource(m, r)) { |
698 |
> |
setcolor(r->rcoef, 0.0, 0.0, 0.0); |
699 |
|
return(1); |
700 |
+ |
} |
701 |
|
/* check for passed illum */ |
702 |
|
if (passillum(m, r)) { |
703 |
|
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
704 |
< |
return(rayshade(r, modifier(m->oargs.sarg[0]))); |
704 |
> |
return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); |
705 |
|
raytrans(r); |
706 |
|
return(1); |
707 |
|
} |
708 |
+ |
/* check for invisibility */ |
709 |
+ |
if (srcignore(m, r)) { |
710 |
+ |
setcolor(r->rcoef, 0.0, 0.0, 0.0); |
711 |
+ |
return(1); |
712 |
+ |
} |
713 |
|
/* otherwise treat as source */ |
714 |
|
/* check for behind */ |
715 |
|
if (r->rod < 0.0) |
541 |
– |
return(1); |
542 |
– |
/* check for invisibility */ |
543 |
– |
if (srcignore(m, r)) |
716 |
|
return(1); |
717 |
|
/* check for outside spot */ |
718 |
|
if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |