1 |
< |
/* Copyright (c) 1991 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1992 Regents of the University of California */ |
2 |
|
|
3 |
|
#ifndef lint |
4 |
|
static char SCCSid[] = "$SunId$ LBL"; |
41 |
|
|
42 |
|
marksources() /* find and mark source objects */ |
43 |
|
{ |
44 |
+ |
int foundsource = 0; |
45 |
|
int i; |
46 |
|
register OBJREC *o, *m; |
47 |
|
register int ns; |
94 |
|
source[ns].sflags |= SSKIP; |
95 |
|
} |
96 |
|
} |
97 |
+ |
if (!(source[ns].sflags & SSKIP)) |
98 |
+ |
foundsource++; |
99 |
|
} |
100 |
< |
if (nsources <= 0) { |
100 |
> |
if (!foundsource) { |
101 |
|
error(WARNING, "no light sources found"); |
102 |
|
return; |
103 |
|
} |
104 |
|
markvirtuals(); /* find and add virtual sources */ |
105 |
|
/* allocate our contribution arrays */ |
106 |
< |
maxcntr = nsources + MAXSPART*2; /* start with this many */ |
106 |
> |
maxcntr = nsources + MAXSPART; /* start with this many */ |
107 |
|
srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
108 |
|
cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
109 |
< |
if (srccnt == NULL || cntord == NULL) |
109 |
> |
if (srccnt == NULL | cntord == NULL) |
110 |
|
goto memerr; |
111 |
|
return; |
112 |
|
memerr: |
120 |
|
SRCINDEX *si; /* source sample index */ |
121 |
|
{ |
122 |
|
double d; /* distance to source */ |
120 |
– |
FVECT vd; |
123 |
|
register SRCREC *srcp; |
122 |
– |
register int i; |
124 |
|
|
125 |
|
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
126 |
|
|
127 |
< |
while ((d = nextssamp(sr->rorg, sr->rdir, si)) != 0.0) { |
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) { /* check location */ |
132 |
< |
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 |
< |
} |
131 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
132 |
> |
continue; |
133 |
|
return(1); /* sample OK */ |
134 |
|
} |
135 |
|
/* local source */ |
138 |
|
continue; |
139 |
|
/* check angle */ |
140 |
|
if (srcp->sflags & SSPOT) { |
141 |
< |
if (srcp->sl.s->siz < 2.0*PI * |
149 |
< |
(1.0 + DOT(srcp->sl.s->aim,sr->rdir))) |
141 |
> |
if (spotout(sr, srcp->sl.s, 0)) |
142 |
|
continue; |
143 |
|
/* adjust solid angle */ |
144 |
|
si->dom *= d*d; |
220 |
|
maxcntr*sizeof(CONTRIB)); |
221 |
|
cntord = (CNTPTR *)realloc((char *)cntord, |
222 |
|
maxcntr*sizeof(CNTPTR)); |
223 |
< |
if (srccnt == NULL || cntord == NULL) |
223 |
> |
if (srccnt == NULL | cntord == NULL) |
224 |
|
error(SYSTEM, "out of memory in direct"); |
225 |
|
} |
226 |
|
cntord[sn].sndx = sn; |
253 |
|
l = m; |
254 |
|
} |
255 |
|
} |
256 |
+ |
if (ncnts == 0) |
257 |
+ |
return; /* no contributions! */ |
258 |
|
/* accumulate tail */ |
259 |
|
for (sn = ncnts-1; sn > 0; sn--) |
260 |
|
cntord[sn-1].brt += cntord[sn].brt; |
311 |
|
scalecolor(srccnt[cntord[sn].sndx].val, prob); |
312 |
|
addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
313 |
|
} |
314 |
+ |
} |
315 |
+ |
|
316 |
+ |
|
317 |
+ |
/**************************************************************** |
318 |
+ |
* The following macros were separated from the m_light() routine |
319 |
+ |
* because they are very nasty and difficult to understand. |
320 |
+ |
*/ |
321 |
+ |
|
322 |
+ |
/* wrongillum * |
323 |
+ |
* |
324 |
+ |
* We cannot allow an illum to pass to another illum, because that |
325 |
+ |
* would almost certainly constitute overcounting. |
326 |
+ |
* However, we do allow an illum to pass to another illum |
327 |
+ |
* that is actually going to relay to a virtual light source. |
328 |
+ |
*/ |
329 |
+ |
|
330 |
+ |
#define wrongillum(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
331 |
+ |
objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM) |
332 |
+ |
|
333 |
+ |
/* wrongsource * |
334 |
+ |
* |
335 |
+ |
* This source is the wrong source (ie. overcounted) if we are |
336 |
+ |
* aimed to a different source than the one we hit and the one |
337 |
+ |
* we hit is not an illum which should be passed. |
338 |
+ |
*/ |
339 |
+ |
|
340 |
+ |
#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
341 |
+ |
(m->otype!=MAT_ILLUM || wrongillum(m,r))) |
342 |
+ |
|
343 |
+ |
/* distglow * |
344 |
+ |
* |
345 |
+ |
* A distant glow is an object that sometimes acts as a light source, |
346 |
+ |
* but is too far away from the test point to be one in this case. |
347 |
+ |
*/ |
348 |
+ |
|
349 |
+ |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
350 |
+ |
r->rot > m->oargs.farg[3]) |
351 |
+ |
|
352 |
+ |
/* badcomponent * |
353 |
+ |
* |
354 |
+ |
* We must avoid counting light sources in the ambient calculation, |
355 |
+ |
* since the direct component is handled separately. Therefore, any |
356 |
+ |
* ambient ray which hits an active light source must be discarded. |
357 |
+ |
* The same is true for stray specular samples, since the specular |
358 |
+ |
* contribution from light sources is calculated separately. |
359 |
+ |
*/ |
360 |
+ |
|
361 |
+ |
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
362 |
+ |
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
363 |
+ |
distglow(m, r))) |
364 |
+ |
|
365 |
+ |
/* overcount * |
366 |
+ |
* |
367 |
+ |
* All overcounting possibilities are contained here. |
368 |
+ |
*/ |
369 |
+ |
|
370 |
+ |
#define overcount(m, r) (badcomponent(m,r) || wrongsource(m,r)) |
371 |
+ |
|
372 |
+ |
/* passillum * |
373 |
+ |
* |
374 |
+ |
* An illum passes to another material type when we didn't hit it |
375 |
+ |
* on purpose (as part of a direct calculation), or it is relaying |
376 |
+ |
* a virtual light source. |
377 |
+ |
*/ |
378 |
+ |
|
379 |
+ |
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
380 |
+ |
(r->rsrc<0 || source[r->rsrc].so!=r->ro || \ |
381 |
+ |
source[r->rsrc].sflags&SVIRTUAL)) |
382 |
+ |
|
383 |
+ |
/* srcignore * |
384 |
+ |
* |
385 |
+ |
* The -di flag renders light sources invisible, and here is the test. |
386 |
+ |
*/ |
387 |
+ |
|
388 |
+ |
#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
389 |
+ |
!distglow(m, r)) |
390 |
+ |
|
391 |
+ |
|
392 |
+ |
m_light(m, r) /* ray hit a light source */ |
393 |
+ |
register OBJREC *m; |
394 |
+ |
register RAY *r; |
395 |
+ |
{ |
396 |
+ |
/* check for over-counting */ |
397 |
+ |
if (overcount(m, r)) |
398 |
+ |
return; |
399 |
+ |
/* check for passed illum */ |
400 |
+ |
if (passillum(m, r)) { |
401 |
+ |
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
402 |
+ |
raytrans(r); |
403 |
+ |
else |
404 |
+ |
rayshade(r, modifier(m->oargs.sarg[0])); |
405 |
+ |
return; |
406 |
+ |
} |
407 |
+ |
/* otherwise treat as source */ |
408 |
+ |
/* check for behind */ |
409 |
+ |
if (r->rod < 0.0) |
410 |
+ |
return; |
411 |
+ |
/* check for invisibility */ |
412 |
+ |
if (srcignore(m, r)) |
413 |
+ |
return; |
414 |
+ |
/* check for outside spot */ |
415 |
+ |
if (m->otype==MAT_SPOT && spotout(r, (SPOT *)m->os, r->rot>=FHUGE)) |
416 |
+ |
return; |
417 |
+ |
/* get distribution pattern */ |
418 |
+ |
raytexture(r, m->omod); |
419 |
+ |
/* get source color */ |
420 |
+ |
setcolor(r->rcol, m->oargs.farg[0], |
421 |
+ |
m->oargs.farg[1], |
422 |
+ |
m->oargs.farg[2]); |
423 |
+ |
/* modify value */ |
424 |
+ |
multcolor(r->rcol, r->pcol); |
425 |
|
} |