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/* Copyright (c) 1992 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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*/ |
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|
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+ |
#include "copyright.h" |
11 |
+ |
|
12 |
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#include "ray.h" |
13 |
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|
15 |
– |
#include "octree.h" |
16 |
– |
|
14 |
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#include "otypes.h" |
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|
16 |
+ |
#include "otspecial.h" |
17 |
+ |
|
18 |
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#include "source.h" |
19 |
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|
20 |
+ |
#include "random.h" |
21 |
+ |
|
22 |
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extern double ssampdist; /* scatter sampling distance */ |
23 |
+ |
|
24 |
+ |
#ifndef MAXSSAMP |
25 |
+ |
#define MAXSSAMP 16 /* maximum samples per ray */ |
26 |
+ |
#endif |
27 |
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|
28 |
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/* |
29 |
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* Structures used by direct() |
30 |
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*/ |
46 |
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static int maxcntr = 0; /* size of contribution arrays */ |
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|
48 |
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|
49 |
+ |
OBJREC * /* find an object's actual material */ |
50 |
+ |
findmaterial(register OBJREC *o) |
51 |
+ |
{ |
52 |
+ |
while (!ismaterial(o->otype)) { |
53 |
+ |
if (ismixture(o->otype)) |
54 |
+ |
return(NULL); /* reject mixed materials */ |
55 |
+ |
if (o->otype == MOD_ALIAS && o->oargs.nsargs) { |
56 |
+ |
OBJECT aobj; |
57 |
+ |
OBJREC *ao; |
58 |
+ |
aobj = lastmod(objndx(o), o->oargs.sarg[0]); |
59 |
+ |
if (aobj < 0) |
60 |
+ |
objerror(o, USER, "bad reference"); |
61 |
+ |
ao = objptr(aobj); |
62 |
+ |
if (ismaterial(ao->otype)) |
63 |
+ |
return(ao); |
64 |
+ |
} |
65 |
+ |
if (o->omod == OVOID) |
66 |
+ |
return(NULL); |
67 |
+ |
o = objptr(o->omod); |
68 |
+ |
} |
69 |
+ |
return(o); |
70 |
+ |
} |
71 |
+ |
|
72 |
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|
73 |
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void |
74 |
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marksources() /* find and mark source objects */ |
75 |
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{ |
76 |
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int foundsource = 0; |
80 |
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/* initialize dispatch table */ |
81 |
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initstypes(); |
82 |
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/* find direct sources */ |
83 |
< |
for (i = 0; i < nobjects; i++) { |
83 |
> |
for (i = 0; i < nsceneobjs; i++) { |
84 |
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|
85 |
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o = objptr(i); |
86 |
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|
87 |
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if (!issurface(o->otype) || o->omod == OVOID) |
88 |
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continue; |
89 |
< |
|
90 |
< |
m = objptr(o->omod); |
91 |
< |
|
92 |
< |
if (!islight(m->otype)) |
61 |
< |
continue; |
89 |
> |
/* find material */ |
90 |
> |
m = findmaterial(o); |
91 |
> |
if (m == NULL || !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 |
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m->otype == MAT_SPOT ? 7 : 3)) |
99 |
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o->otype != OBJ_SOURCE && |
100 |
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m->oargs.farg[3] <= FTINY) |
101 |
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continue; /* don't bother */ |
102 |
+ |
if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY && |
103 |
+ |
m->oargs.farg[2] <= FTINY) |
104 |
+ |
continue; /* don't bother */ |
105 |
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|
106 |
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if (sfun[o->otype].of == NULL || |
107 |
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sfun[o->otype].of->setsrc == NULL) |
128 |
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source[ns].sflags |= SSKIP; |
129 |
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} |
130 |
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} |
131 |
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#if SHADCACHE |
132 |
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source[ns].obscache = NULL; |
133 |
+ |
#endif |
134 |
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if (!(source[ns].sflags & SSKIP)) |
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foundsource++; |
136 |
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} |
143 |
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maxcntr = nsources + MAXSPART; /* start with this many */ |
144 |
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srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
145 |
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cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
146 |
< |
if (srccnt == NULL | cntord == NULL) |
146 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
147 |
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goto memerr; |
148 |
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return; |
149 |
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memerr: |
151 |
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} |
152 |
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|
153 |
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|
154 |
< |
srcray(sr, r, si) /* send a ray to a source, return domega */ |
155 |
< |
register RAY *sr; /* returned source ray */ |
119 |
< |
RAY *r; /* ray which hit object */ |
120 |
< |
SRCINDEX *si; /* source sample index */ |
154 |
> |
void |
155 |
> |
freesources() /* free all source structures */ |
156 |
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{ |
157 |
+ |
if (nsources > 0) { |
158 |
+ |
#if SHADCACHE |
159 |
+ |
while (nsources--) |
160 |
+ |
freeobscache(&source[nsources]); |
161 |
+ |
#endif |
162 |
+ |
free((void *)source); |
163 |
+ |
source = NULL; |
164 |
+ |
nsources = 0; |
165 |
+ |
} |
166 |
+ |
if (maxcntr <= 0) |
167 |
+ |
return; |
168 |
+ |
free((void *)srccnt); |
169 |
+ |
srccnt = NULL; |
170 |
+ |
free((void *)cntord); |
171 |
+ |
cntord = NULL; |
172 |
+ |
maxcntr = 0; |
173 |
+ |
} |
174 |
+ |
|
175 |
+ |
|
176 |
+ |
int |
177 |
+ |
srcray( /* send a ray to a source, return domega */ |
178 |
+ |
register RAY *sr, /* returned source ray */ |
179 |
+ |
RAY *r, /* ray which hit object */ |
180 |
+ |
SRCINDEX *si /* source sample index */ |
181 |
+ |
) |
182 |
+ |
{ |
183 |
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double d; /* distance to source */ |
184 |
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register SRCREC *srcp; |
185 |
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|
189 |
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sr->rsrc = si->sn; /* remember source */ |
190 |
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srcp = source + si->sn; |
191 |
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if (srcp->sflags & SDISTANT) { |
192 |
< |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
192 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
193 |
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continue; |
194 |
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return(1); /* sample OK */ |
195 |
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} |
199 |
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continue; |
200 |
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/* check angle */ |
201 |
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if (srcp->sflags & SSPOT) { |
202 |
< |
if (spotout(sr, srcp->sl.s, 0)) |
202 |
> |
if (spotout(sr, srcp->sl.s)) |
203 |
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continue; |
204 |
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/* adjust solid angle */ |
205 |
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si->dom *= d*d; |
212 |
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} |
213 |
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|
214 |
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|
215 |
< |
srcvalue(r) /* punch ray to source and compute value */ |
216 |
< |
RAY *r; |
215 |
> |
void |
216 |
> |
srcvalue( /* punch ray to source and compute value */ |
217 |
> |
register RAY *r |
218 |
> |
) |
219 |
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{ |
220 |
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register SRCREC *sp; |
221 |
|
|
224 |
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/* check intersection */ |
225 |
|
if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
226 |
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return; |
227 |
< |
raycont(r); /* compute contribution */ |
227 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
228 |
> |
goto nomat; |
229 |
> |
rayparticipate(r); |
230 |
|
return; |
231 |
|
} |
232 |
|
/* compute intersection */ |
234 |
|
(*ofun[sp->so->otype].funp)(sp->so, r)) { |
235 |
|
if (sp->sa.success >= 0) |
236 |
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sp->sa.success++; |
237 |
< |
raycont(r); /* compute contribution */ |
237 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
238 |
> |
goto nomat; |
239 |
> |
rayparticipate(r); |
240 |
|
return; |
241 |
|
} |
242 |
+ |
/* we missed our mark! */ |
243 |
|
if (sp->sa.success < 0) |
244 |
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return; /* bitched already */ |
245 |
|
sp->sa.success -= AIMREQT; |
248 |
|
sprintf(errmsg, "aiming failure for light source \"%s\"", |
249 |
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sp->so->oname); |
250 |
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error(WARNING, errmsg); /* issue warning */ |
251 |
+ |
return; |
252 |
+ |
nomat: |
253 |
+ |
objerror(r->ro, USER, "material not found"); |
254 |
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} |
255 |
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|
256 |
|
|
257 |
< |
sourcehit(r) /* check to see if ray hit distant source */ |
258 |
< |
register RAY *r; |
257 |
> |
int |
258 |
> |
sourcehit( /* check to see if ray hit distant source */ |
259 |
> |
register RAY *r |
260 |
> |
) |
261 |
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{ |
262 |
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int first, last; |
263 |
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register int i; |
281 |
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} |
282 |
|
|
283 |
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if (r->ro != NULL) { |
284 |
+ |
r->robj = objndx(r->ro); |
285 |
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for (i = 0; i < 3; i++) |
286 |
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r->ron[i] = -r->rdir[i]; |
287 |
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r->rod = 1.0; |
288 |
+ |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
289 |
+ |
r->uv[0] = r->uv[1] = 0.0; |
290 |
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r->rox = NULL; |
291 |
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return(1); |
292 |
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} |
294 |
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} |
295 |
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|
296 |
|
|
297 |
+ |
#if SHADCACHE /* preemptive shadow checking */ |
298 |
+ |
#define ABS(x) ((x)>0 ? (x) : -(x)) |
299 |
+ |
|
300 |
+ |
static void /* find closest blockers to source */ |
301 |
+ |
initobscache(SRCREC *srcp) |
302 |
+ |
{ |
303 |
+ |
int i; |
304 |
+ |
int cachelen; |
305 |
+ |
|
306 |
+ |
if (srcp->sflags & SDISTANT) |
307 |
+ |
cachelen = 4*SHADCACHE*SHADCACHE; |
308 |
+ |
else if (srcp->sflags & SFLAT) |
309 |
+ |
cachelen = SHADCACHE*SHADCACHE*3 + (SHADCACHE&1)*SHADCACHE*4; |
310 |
+ |
else /* spherical distribution */ |
311 |
+ |
cachelen = SHADCACHE*SHADCACHE*6; |
312 |
+ |
/* allocate cache */ |
313 |
+ |
DCHECK(srcp->obscache != NULL, |
314 |
+ |
CONSISTENCY, "initobscache() called twice"); |
315 |
+ |
srcp->obscache = (OBSCACHE *)malloc(sizeof(OBSCACHE) + |
316 |
+ |
sizeof(OBJECT)*(cachelen-1)); |
317 |
+ |
if (srcp->obscache == NULL) |
318 |
+ |
error(SYSTEM, "out of memory in initobscache()"); |
319 |
+ |
/* set parameters */ |
320 |
+ |
if (srcp->sflags & SDISTANT) { |
321 |
+ |
int ax, ax1, ax2; |
322 |
+ |
RREAL amax = 0; |
323 |
+ |
for (ax1 = 3; ax1--; ) |
324 |
+ |
if (ABS(srcp->sloc[ax1]) > amax) { |
325 |
+ |
amax = ABS(srcp->sloc[ax1]); |
326 |
+ |
ax = ax1; |
327 |
+ |
} |
328 |
+ |
srcp->obscache->p.d.ax = ax; |
329 |
+ |
ax1 = (ax+1)%3; |
330 |
+ |
ax2 = (ax+2)%3; |
331 |
+ |
VCOPY(srcp->obscache->p.d.o, thescene.cuorg); |
332 |
+ |
if (srcp->sloc[ax] > 0) |
333 |
+ |
srcp->obscache->p.d.o[ax] += thescene.cusize; |
334 |
+ |
if (srcp->sloc[ax1] < 0) |
335 |
+ |
srcp->obscache->p.d.o[ax1] += thescene.cusize * |
336 |
+ |
srcp->sloc[ax1] / ABS(srcp->sloc[ax]); |
337 |
+ |
if (srcp->sloc[ax2] < 0) |
338 |
+ |
srcp->obscache->p.d.o[ax2] += thescene.cusize * |
339 |
+ |
srcp->sloc[ax2] / ABS(srcp->sloc[ax]); |
340 |
+ |
srcp->obscache->p.d.e1 = (1.-FTINY) / (thescene.cusize*(1. + |
341 |
+ |
fabs(srcp->sloc[ax1]/srcp->sloc[ax]))); |
342 |
+ |
srcp->obscache->p.d.e2 = (1.-FTINY) / (thescene.cusize*(1. + |
343 |
+ |
fabs(srcp->sloc[ax2]/srcp->sloc[ax]))); |
344 |
+ |
} else if (srcp->sflags & SFLAT) { |
345 |
+ |
VCOPY(srcp->obscache->p.f.u, srcp->ss[SU]); |
346 |
+ |
normalize(srcp->obscache->p.f.u); |
347 |
+ |
fcross(srcp->obscache->p.f.v, |
348 |
+ |
srcp->snorm, srcp->obscache->p.f.u); |
349 |
+ |
} |
350 |
+ |
/* XXX Should cast rays from source */ |
351 |
+ |
for (i = cachelen; i--; ) |
352 |
+ |
srcp->obscache->obs[i] = OVOID; |
353 |
+ |
} |
354 |
+ |
|
355 |
+ |
|
356 |
+ |
static OBJECT * /* return occluder cache entry */ |
357 |
+ |
srcobstructp(register RAY *r) |
358 |
+ |
{ |
359 |
+ |
static OBJECT noobs; |
360 |
+ |
SRCREC *srcp; |
361 |
+ |
int ondx; |
362 |
+ |
|
363 |
+ |
DCHECK(r->rsrc < 0, CONSISTENCY, |
364 |
+ |
"srcobstructp() called with unaimed ray"); |
365 |
+ |
noobs = OVOID; |
366 |
+ |
srcp = &source[r->rsrc]; |
367 |
+ |
if (srcp->obscache == NULL) /* initialize cache */ |
368 |
+ |
initobscache(srcp); |
369 |
+ |
/* compute cache index */ |
370 |
+ |
if (srcp->sflags & SDISTANT) { |
371 |
+ |
int ax, ax1, ax2; |
372 |
+ |
double t; |
373 |
+ |
ax = srcp->obscache->p.d.ax; |
374 |
+ |
if ((ax1 = ax+1) >= 3) ax1 -= 3; |
375 |
+ |
if ((ax2 = ax+2) >= 3) ax2 -= 3; |
376 |
+ |
t = (srcp->obscache->p.d.o[ax] - r->rorg[ax]) / srcp->sloc[ax]; |
377 |
+ |
if (t <= FTINY) |
378 |
+ |
return &noobs; /* could happen if ray is outside */ |
379 |
+ |
ondx = 2*SHADCACHE*(int)(2*SHADCACHE*srcp->obscache->p.d.e1 * |
380 |
+ |
(r->rorg[ax1] + t*srcp->sloc[ax1] - |
381 |
+ |
srcp->obscache->p.d.o[ax1])); |
382 |
+ |
ondx += (int)(2*SHADCACHE*srcp->obscache->p.d.e2 * |
383 |
+ |
(r->rorg[ax2] + t*srcp->sloc[ax2] - |
384 |
+ |
srcp->obscache->p.d.o[ax2])); |
385 |
+ |
} else if (srcp->sflags & SFLAT) { |
386 |
+ |
FVECT sd; |
387 |
+ |
RREAL sd0m, sd1m; |
388 |
+ |
sd[0] = -DOT(r->rdir, srcp->obscache->p.f.u); |
389 |
+ |
sd[1] = -DOT(r->rdir, srcp->obscache->p.f.v); |
390 |
+ |
sd[2] = -DOT(r->rdir, srcp->snorm); |
391 |
+ |
if (sd[2] < 0) |
392 |
+ |
return &noobs; /* shouldn't happen */ |
393 |
+ |
sd0m = ABS(sd[0]); |
394 |
+ |
sd1m = ABS(sd[1]); |
395 |
+ |
if (sd[2] >= sd0m && sd[2] >= sd1m) { |
396 |
+ |
ondx = SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
397 |
+ |
(1. + sd[0]/sd[2])); |
398 |
+ |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
399 |
+ |
(1. + sd[1]/sd[2])); |
400 |
+ |
} else if (sd0m >= sd1m) { |
401 |
+ |
ondx = SHADCACHE*SHADCACHE; |
402 |
+ |
if (sd[0] < 0) |
403 |
+ |
ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
404 |
+ |
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
405 |
+ |
sd[2]/sd0m); |
406 |
+ |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
407 |
+ |
(1. + sd[1]/sd0m)); |
408 |
+ |
} else /* sd1m > sd0m */ { |
409 |
+ |
ondx = SHADCACHE*SHADCACHE + |
410 |
+ |
((SHADCACHE+1)>>1)*SHADCACHE*2; |
411 |
+ |
if (sd[1] < 0) |
412 |
+ |
ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
413 |
+ |
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
414 |
+ |
sd[2]/sd1m); |
415 |
+ |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
416 |
+ |
(1. + sd[0]/sd1m)); |
417 |
+ |
} |
418 |
+ |
} else /* spherical distribution */ { |
419 |
+ |
int ax, ax1, ax2; |
420 |
+ |
RREAL amax = 0; |
421 |
+ |
for (ax1 = 3; ax1--; ) |
422 |
+ |
if (ABS(r->rdir[ax1]) > amax) { |
423 |
+ |
amax = ABS(r->rdir[ax1]); |
424 |
+ |
ax = ax1; |
425 |
+ |
} |
426 |
+ |
if ((ax1 = ax+1) >= 3) ax1 -= 3; |
427 |
+ |
if ((ax2 = ax+2) >= 3) ax2 -= 3; |
428 |
+ |
ondx = 2*SHADCACHE*SHADCACHE * ax; |
429 |
+ |
if (r->rdir[ax] < 0) |
430 |
+ |
ondx += SHADCACHE*SHADCACHE; |
431 |
+ |
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
432 |
+ |
(1. + r->rdir[ax1]/amax)); |
433 |
+ |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
434 |
+ |
(1. + r->rdir[ax2]/amax)); |
435 |
+ |
} |
436 |
+ |
/* return cache pointer */ |
437 |
+ |
return(&srcp->obscache->obs[ondx]); |
438 |
+ |
} |
439 |
+ |
|
440 |
+ |
|
441 |
+ |
void /* free obstruction cache */ |
442 |
+ |
freeobscache(SRCREC *srcp) |
443 |
+ |
{ |
444 |
+ |
if (srcp->obscache == NULL) |
445 |
+ |
return; |
446 |
+ |
free((void *)srcp->obscache); |
447 |
+ |
srcp->obscache = NULL; |
448 |
+ |
} |
449 |
+ |
|
450 |
+ |
|
451 |
+ |
void /* record a source blocker */ |
452 |
+ |
srcblocker(register RAY *r) |
453 |
+ |
{ |
454 |
+ |
OBJREC *m; |
455 |
+ |
|
456 |
+ |
if (r->robj == OVOID || objptr(r->robj) != r->ro || |
457 |
+ |
isvolume(r->ro->otype)) |
458 |
+ |
return; /* don't record complex blockers */ |
459 |
+ |
m = findmaterial(r->ro); |
460 |
+ |
if (m == NULL) |
461 |
+ |
return; /* no material?! */ |
462 |
+ |
if (!(ofun[m->otype].flags & T_OPAQUE)) |
463 |
+ |
return; /* material not a reliable blocker */ |
464 |
+ |
|
465 |
+ |
*srcobstructp(r) = r->robj; /* else record obstructor */ |
466 |
+ |
} |
467 |
+ |
|
468 |
+ |
|
469 |
+ |
int /* check ray against cached blocker */ |
470 |
+ |
srcblocked(RAY *r) |
471 |
+ |
{ |
472 |
+ |
OBJECT obs = *srcobstructp(r); |
473 |
+ |
OBJREC *op; |
474 |
+ |
|
475 |
+ |
if (obs == OVOID) |
476 |
+ |
return(0); |
477 |
+ |
op = objptr(obs); /* check for intersection */ |
478 |
+ |
return ((*ofun[op->otype].funp)(op, r)); |
479 |
+ |
} |
480 |
+ |
|
481 |
+ |
#endif |
482 |
+ |
|
483 |
+ |
|
484 |
|
static int |
485 |
< |
cntcmp(sc1, sc2) /* contribution compare (descending) */ |
486 |
< |
register CNTPTR *sc1, *sc2; |
485 |
> |
cntcmp( /* contribution compare (descending) */ |
486 |
> |
const void *p1, |
487 |
> |
const void *p2 |
488 |
> |
) |
489 |
|
{ |
490 |
+ |
register const CNTPTR *sc1 = (const CNTPTR *)p1; |
491 |
+ |
register const CNTPTR *sc2 = (const CNTPTR *)p2; |
492 |
+ |
|
493 |
|
if (sc1->brt > sc2->brt) |
494 |
|
return(-1); |
495 |
|
if (sc1->brt < sc2->brt) |
498 |
|
} |
499 |
|
|
500 |
|
|
501 |
< |
direct(r, f, p) /* add direct component */ |
502 |
< |
RAY *r; /* ray that hit surface */ |
503 |
< |
int (*f)(); /* direct component coefficient function */ |
504 |
< |
char *p; /* data for f */ |
501 |
> |
void |
502 |
> |
direct( /* add direct component */ |
503 |
> |
RAY *r, /* ray that hit surface */ |
504 |
> |
void (*f)(), /* direct component coefficient function */ |
505 |
> |
char *p /* data for f */ |
506 |
> |
) |
507 |
|
{ |
508 |
< |
extern int (*trace)(); |
508 |
> |
extern void (*trace)(); |
509 |
|
register int sn; |
510 |
|
register CONTRIB *scp; |
511 |
|
SRCINDEX si; |
521 |
|
for (sn = 0; srcray(&sr, r, &si); sn++) { |
522 |
|
if (sn >= maxcntr) { |
523 |
|
maxcntr = sn + MAXSPART; |
524 |
< |
srccnt = (CONTRIB *)realloc((char *)srccnt, |
524 |
> |
srccnt = (CONTRIB *)realloc((void *)srccnt, |
525 |
|
maxcntr*sizeof(CONTRIB)); |
526 |
< |
cntord = (CNTPTR *)realloc((char *)cntord, |
526 |
> |
cntord = (CNTPTR *)realloc((void *)cntord, |
527 |
|
maxcntr*sizeof(CNTPTR)); |
528 |
< |
if (srccnt == NULL | cntord == NULL) |
528 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
529 |
|
error(SYSTEM, "out of memory in direct"); |
530 |
|
} |
531 |
|
cntord[sn].sndx = sn; |
536 |
|
cntord[sn].brt = bright(scp->coef); |
537 |
|
if (cntord[sn].brt <= 0.0) |
538 |
|
continue; |
539 |
+ |
#if SHADCACHE |
540 |
+ |
/* check shadow cache */ |
541 |
+ |
if (si.np == 1 && srcblocked(&sr)) { |
542 |
+ |
cntord[sn].brt = 0.0; |
543 |
+ |
continue; |
544 |
+ |
} |
545 |
+ |
#endif |
546 |
|
VCOPY(scp->dir, sr.rdir); |
547 |
|
/* compute potential */ |
548 |
|
sr.revf = srcvalue; |
576 |
|
/* modify threshold */ |
577 |
|
ourthresh = shadthresh / r->rweight; |
578 |
|
/* test for shadows */ |
579 |
< |
nhits = 0; |
580 |
< |
for (sn = 0; sn < ncnts; sn++) { |
579 |
> |
for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts; |
580 |
> |
hwt += (double)source[scp->sno].nhits / |
581 |
> |
(double)source[scp->sno].ntests, |
582 |
> |
sn++) { |
583 |
|
/* check threshold */ |
584 |
|
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
585 |
|
cntord[sn].brt-cntord[sn+nshadcheck].brt) |
590 |
|
rayorigin(&sr, r, SHADOW, 1.0); |
591 |
|
VCOPY(sr.rdir, scp->dir); |
592 |
|
sr.rsrc = scp->sno; |
593 |
< |
source[scp->sno].ntests++; /* keep statistics */ |
593 |
> |
/* keep statistics */ |
594 |
> |
if (source[scp->sno].ntests++ > 0xfffffff0) { |
595 |
> |
source[scp->sno].ntests >>= 1; |
596 |
> |
source[scp->sno].nhits >>= 1; |
597 |
> |
} |
598 |
|
if (localhit(&sr, &thescene) && |
599 |
|
( sr.ro != source[scp->sno].so || |
600 |
|
source[scp->sno].sflags & SFOLLOW )) { |
601 |
|
/* follow entire path */ |
602 |
|
raycont(&sr); |
603 |
+ |
rayparticipate(&sr); |
604 |
|
if (trace != NULL) |
605 |
|
(*trace)(&sr); /* trace execution */ |
606 |
< |
if (bright(sr.rcol) <= FTINY) |
606 |
> |
if (bright(sr.rcol) <= FTINY) { |
607 |
> |
#if SHADCACHE |
608 |
> |
if ((scp <= srccnt || scp[-1].sno != scp->sno) |
609 |
> |
&& (scp >= srccnt+ncnts || |
610 |
> |
scp[1].sno != scp->sno)) |
611 |
> |
srcblocker(&sr); |
612 |
> |
#endif |
613 |
|
continue; /* missed! */ |
614 |
+ |
} |
615 |
|
copycolor(scp->val, sr.rcol); |
616 |
|
multcolor(scp->val, scp->coef); |
617 |
|
} |
620 |
|
nhits++; |
621 |
|
source[scp->sno].nhits++; |
622 |
|
} |
623 |
< |
/* surface hit rate */ |
624 |
< |
if (sn > 0) |
625 |
< |
hwt = (double)nhits / (double)sn; |
623 |
> |
/* source hit rate */ |
624 |
> |
if (hwt > FTINY) |
625 |
> |
hwt = (double)nhits / hwt; |
626 |
|
else |
627 |
|
hwt = 0.5; |
628 |
|
#ifdef DEBUG |
629 |
< |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
629 |
> |
sprintf(errmsg, "%d tested, %d untested, %f conditional hit rate\n", |
630 |
|
sn, ncnts-sn, hwt); |
631 |
|
eputs(errmsg); |
632 |
|
#endif |
635 |
|
scp = srccnt + cntord[sn].sndx; |
636 |
|
prob = hwt * (double)source[scp->sno].nhits / |
637 |
|
(double)source[scp->sno].ntests; |
638 |
+ |
if (prob > 1.0) |
639 |
+ |
prob = 1.0; |
640 |
|
scalecolor(scp->val, prob); |
641 |
|
addcolor(r->rcol, scp->val); |
642 |
|
} |
643 |
|
} |
644 |
|
|
645 |
|
|
646 |
+ |
void |
647 |
+ |
srcscatter( /* compute source scattering into ray */ |
648 |
+ |
register RAY *r |
649 |
+ |
) |
650 |
+ |
{ |
651 |
+ |
int oldsampndx; |
652 |
+ |
int nsamps; |
653 |
+ |
RAY sr; |
654 |
+ |
SRCINDEX si; |
655 |
+ |
double t, d; |
656 |
+ |
double re, ge, be; |
657 |
+ |
COLOR cvext; |
658 |
+ |
int i, j; |
659 |
+ |
|
660 |
+ |
if (r->slights == NULL || r->slights[0] == 0 |
661 |
+ |
|| r->gecc >= 1.-FTINY || r->rot >= FHUGE) |
662 |
+ |
return; |
663 |
+ |
if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) |
664 |
+ |
nsamps = 1; |
665 |
+ |
#if MAXSSAMP |
666 |
+ |
else if (nsamps > MAXSSAMP) |
667 |
+ |
nsamps = MAXSSAMP; |
668 |
+ |
#endif |
669 |
+ |
oldsampndx = samplendx; |
670 |
+ |
samplendx = random()&0x7fff; /* randomize */ |
671 |
+ |
for (i = r->slights[0]; i > 0; i--) { /* for each source */ |
672 |
+ |
for (j = 0; j < nsamps; j++) { /* for each sample position */ |
673 |
+ |
samplendx++; |
674 |
+ |
t = r->rot * (j+frandom())/nsamps; |
675 |
+ |
/* extinction */ |
676 |
+ |
re = t*colval(r->cext,RED); |
677 |
+ |
ge = t*colval(r->cext,GRN); |
678 |
+ |
be = t*colval(r->cext,BLU); |
679 |
+ |
setcolor(cvext, re > 92. ? 0. : exp(-re), |
680 |
+ |
ge > 92. ? 0. : exp(-ge), |
681 |
+ |
be > 92. ? 0. : exp(-be)); |
682 |
+ |
if (intens(cvext) <= FTINY) |
683 |
+ |
break; /* too far away */ |
684 |
+ |
sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
685 |
+ |
sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
686 |
+ |
sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
687 |
+ |
sr.rmax = 0.; |
688 |
+ |
initsrcindex(&si); /* sample ray to this source */ |
689 |
+ |
si.sn = r->slights[i]; |
690 |
+ |
nopart(&si, &sr); |
691 |
+ |
if (!srcray(&sr, NULL, &si) || |
692 |
+ |
sr.rsrc != r->slights[i]) |
693 |
+ |
continue; /* no path */ |
694 |
+ |
copycolor(sr.cext, r->cext); |
695 |
+ |
copycolor(sr.albedo, r->albedo); |
696 |
+ |
sr.gecc = r->gecc; |
697 |
+ |
sr.slights = r->slights; |
698 |
+ |
rayvalue(&sr); /* eval. source ray */ |
699 |
+ |
if (bright(sr.rcol) <= FTINY) |
700 |
+ |
continue; |
701 |
+ |
if (r->gecc <= FTINY) /* compute P(theta) */ |
702 |
+ |
d = 1.; |
703 |
+ |
else { |
704 |
+ |
d = DOT(r->rdir, sr.rdir); |
705 |
+ |
d = 1. + r->gecc*r->gecc - 2.*r->gecc*d; |
706 |
+ |
d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); |
707 |
+ |
} |
708 |
+ |
/* other factors */ |
709 |
+ |
d *= si.dom * r->rot / (4.*PI*nsamps); |
710 |
+ |
multcolor(sr.rcol, r->cext); |
711 |
+ |
multcolor(sr.rcol, r->albedo); |
712 |
+ |
scalecolor(sr.rcol, d); |
713 |
+ |
multcolor(sr.rcol, cvext); |
714 |
+ |
addcolor(r->rcol, sr.rcol); /* add it in */ |
715 |
+ |
} |
716 |
+ |
} |
717 |
+ |
samplendx = oldsampndx; |
718 |
+ |
} |
719 |
+ |
|
720 |
+ |
|
721 |
|
/**************************************************************** |
722 |
|
* The following macros were separated from the m_light() routine |
723 |
|
* because they are very nasty and difficult to understand. |
724 |
|
*/ |
725 |
|
|
726 |
< |
/* wrongillum * |
726 |
> |
/* illumblock * |
727 |
|
* |
728 |
|
* We cannot allow an illum to pass to another illum, because that |
729 |
|
* would almost certainly constitute overcounting. |
730 |
|
* However, we do allow an illum to pass to another illum |
731 |
|
* that is actually going to relay to a virtual light source. |
732 |
+ |
* We also prevent an illum from passing to a glow; this provides a |
733 |
+ |
* convenient mechanism for defining detailed light source |
734 |
+ |
* geometry behind (or inside) an effective radiator. |
735 |
|
*/ |
736 |
|
|
737 |
< |
#define wrongillum(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
738 |
< |
objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM) |
737 |
> |
static int |
738 |
> |
weaksrcmat(int obj) /* identify material */ |
739 |
> |
{ |
740 |
> |
register OBJREC *o = objptr(obj); |
741 |
> |
|
742 |
> |
while (!ismaterial(o->otype)) /* find material */ |
743 |
> |
o = objptr(o->omod); |
744 |
> |
return((o->otype==MAT_ILLUM)|(o->otype==MAT_GLOW)); |
745 |
> |
} |
746 |
|
|
747 |
+ |
#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
748 |
+ |
r->rod > 0.0 && \ |
749 |
+ |
weaksrcmat(source[r->rsrc].so->omod)) |
750 |
+ |
|
751 |
|
/* wrongsource * |
752 |
|
* |
753 |
|
* This source is the wrong source (ie. overcounted) if we are |
754 |
|
* aimed to a different source than the one we hit and the one |
755 |
< |
* we hit is not an illum which should be passed. |
755 |
> |
* we hit is not an illum that should be passed. |
756 |
|
*/ |
757 |
|
|
758 |
|
#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
759 |
< |
(m->otype!=MAT_ILLUM || wrongillum(m,r))) |
759 |
> |
(m->otype!=MAT_ILLUM || illumblock(m,r))) |
760 |
|
|
761 |
|
/* distglow * |
762 |
|
* |
763 |
|
* A distant glow is an object that sometimes acts as a light source, |
764 |
|
* but is too far away from the test point to be one in this case. |
765 |
+ |
* (Glows with negative radii should NEVER participate in illumination.) |
766 |
|
*/ |
767 |
|
|
768 |
< |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
769 |
< |
r->rot > m->oargs.farg[3]) |
768 |
> |
#define distglow(m, r, d) (m->otype==MAT_GLOW && \ |
769 |
> |
m->oargs.farg[3] >= -FTINY && \ |
770 |
> |
d > m->oargs.farg[3]) |
771 |
|
|
772 |
|
/* badcomponent * |
773 |
|
* |
780 |
|
|
781 |
|
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
782 |
|
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
783 |
< |
distglow(m, r))) |
783 |
> |
/* not 100% correct */ distglow(m, r, r->rot))) |
784 |
|
|
401 |
– |
/* overcount * |
402 |
– |
* |
403 |
– |
* All overcounting possibilities are contained here. |
404 |
– |
*/ |
405 |
– |
|
406 |
– |
#define overcount(m, r) (badcomponent(m,r) || wrongsource(m,r)) |
407 |
– |
|
785 |
|
/* passillum * |
786 |
|
* |
787 |
|
* An illum passes to another material type when we didn't hit it |
795 |
|
|
796 |
|
/* srcignore * |
797 |
|
* |
798 |
< |
* The -di flag renders light sources invisible, and here is the test. |
798 |
> |
* The -dv flag is normally on for sources to be visible. |
799 |
|
*/ |
800 |
|
|
801 |
< |
#define srcignore(m, r) (!directvis && !(r->crtype&SHADOW) && \ |
802 |
< |
!distglow(m, r)) |
801 |
> |
#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
802 |
> |
distglow(m, r, raydist(r,PRIMARY))) |
803 |
|
|
804 |
|
|
805 |
< |
m_light(m, r) /* ray hit a light source */ |
806 |
< |
register OBJREC *m; |
807 |
< |
register RAY *r; |
805 |
> |
int |
806 |
> |
m_light( /* ray hit a light source */ |
807 |
> |
register OBJREC *m, |
808 |
> |
register RAY *r |
809 |
> |
) |
810 |
|
{ |
811 |
|
/* check for over-counting */ |
812 |
< |
if (overcount(m, r)) |
813 |
< |
return; |
812 |
> |
if (badcomponent(m, r)) |
813 |
> |
return(1); |
814 |
> |
if (wrongsource(m, r)) |
815 |
> |
return(1); |
816 |
|
/* check for passed illum */ |
817 |
|
if (passillum(m, r)) { |
818 |
< |
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
819 |
< |
raytrans(r); |
820 |
< |
else |
821 |
< |
rayshade(r, modifier(m->oargs.sarg[0])); |
441 |
< |
return; |
818 |
> |
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
819 |
> |
return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); |
820 |
> |
raytrans(r); |
821 |
> |
return(1); |
822 |
|
} |
823 |
|
/* otherwise treat as source */ |
824 |
|
/* check for behind */ |
825 |
|
if (r->rod < 0.0) |
826 |
< |
return; |
826 |
> |
return(1); |
827 |
|
/* check for invisibility */ |
828 |
|
if (srcignore(m, r)) |
829 |
< |
return; |
829 |
> |
return(1); |
830 |
|
/* check for outside spot */ |
831 |
< |
if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) |
832 |
< |
return; |
831 |
> |
if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |
832 |
> |
return(1); |
833 |
|
/* get distribution pattern */ |
834 |
|
raytexture(r, m->omod); |
835 |
|
/* get source color */ |
838 |
|
m->oargs.farg[2]); |
839 |
|
/* modify value */ |
840 |
|
multcolor(r->rcol, r->pcol); |
841 |
+ |
return(1); |
842 |
|
} |