1 |
< |
/* Copyright (c) 1993 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1995 Regents of the University of California */ |
2 |
|
|
3 |
|
#ifndef lint |
4 |
|
static char SCCSid[] = "$SunId$ LBL"; |
18 |
|
|
19 |
|
#include "source.h" |
20 |
|
|
21 |
+ |
#include "random.h" |
22 |
+ |
|
23 |
+ |
extern double ssampdist; /* scatter sampling distance */ |
24 |
+ |
|
25 |
|
/* |
26 |
|
* Structures used by direct() |
27 |
|
*/ |
72 |
|
o->otype != OBJ_SOURCE && |
73 |
|
m->oargs.farg[3] <= FTINY) |
74 |
|
continue; /* don't bother */ |
75 |
+ |
if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY && |
76 |
+ |
m->oargs.farg[2] <= FTINY) |
77 |
+ |
continue; /* don't bother */ |
78 |
|
|
79 |
|
if (sfun[o->otype].of == NULL || |
80 |
|
sfun[o->otype].of->setsrc == NULL) |
135 |
|
sr->rsrc = si->sn; /* remember source */ |
136 |
|
srcp = source + si->sn; |
137 |
|
if (srcp->sflags & SDISTANT) { |
138 |
< |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
138 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
139 |
|
continue; |
140 |
|
return(1); /* sample OK */ |
141 |
|
} |
145 |
|
continue; |
146 |
|
/* check angle */ |
147 |
|
if (srcp->sflags & SSPOT) { |
148 |
< |
if (spotout(sr, srcp->sl.s, 0)) |
148 |
> |
if (spotout(sr, srcp->sl.s)) |
149 |
|
continue; |
150 |
|
/* adjust solid angle */ |
151 |
|
si->dom *= d*d; |
159 |
|
|
160 |
|
|
161 |
|
srcvalue(r) /* punch ray to source and compute value */ |
162 |
< |
RAY *r; |
162 |
> |
register RAY *r; |
163 |
|
{ |
164 |
|
register SRCREC *sp; |
165 |
|
|
168 |
|
/* check intersection */ |
169 |
|
if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
170 |
|
return; |
171 |
< |
raycont(r); /* compute contribution */ |
171 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
172 |
> |
goto nomat; |
173 |
> |
rayparticipate(r); |
174 |
|
return; |
175 |
|
} |
176 |
|
/* compute intersection */ |
178 |
|
(*ofun[sp->so->otype].funp)(sp->so, r)) { |
179 |
|
if (sp->sa.success >= 0) |
180 |
|
sp->sa.success++; |
181 |
< |
raycont(r); /* compute contribution */ |
181 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
182 |
> |
goto nomat; |
183 |
> |
rayparticipate(r); |
184 |
|
return; |
185 |
|
} |
186 |
+ |
/* we missed our mark! */ |
187 |
|
if (sp->sa.success < 0) |
188 |
|
return; /* bitched already */ |
189 |
|
sp->sa.success -= AIMREQT; |
192 |
|
sprintf(errmsg, "aiming failure for light source \"%s\"", |
193 |
|
sp->so->oname); |
194 |
|
error(WARNING, errmsg); /* issue warning */ |
195 |
+ |
return; |
196 |
+ |
nomat: |
197 |
+ |
objerror(r->ro, USER, "material not found"); |
198 |
|
} |
199 |
|
|
200 |
|
|
333 |
|
( sr.ro != source[scp->sno].so || |
334 |
|
source[scp->sno].sflags & SFOLLOW )) { |
335 |
|
/* follow entire path */ |
336 |
< |
raycont(&sr); |
336 |
> |
if (!raycont(&sr)) |
337 |
> |
objerror(sr.ro, USER, "material not found"); |
338 |
> |
rayparticipate(&sr); |
339 |
|
if (trace != NULL) |
340 |
|
(*trace)(&sr); /* trace execution */ |
341 |
|
if (bright(sr.rcol) <= FTINY) |
371 |
|
} |
372 |
|
|
373 |
|
|
374 |
+ |
srcscatter(r) /* compute source scattering into ray */ |
375 |
+ |
register RAY *r; |
376 |
+ |
{ |
377 |
+ |
int oldsampndx; |
378 |
+ |
int nsamps; |
379 |
+ |
RAY sr; |
380 |
+ |
SRCINDEX si; |
381 |
+ |
double t, lastt, d; |
382 |
+ |
COLOR cumval, ctmp; |
383 |
+ |
int i, j; |
384 |
+ |
|
385 |
+ |
if (r->slights == NULL || r->slights[0] == 0 || r->gecc >= 1.-FTINY) |
386 |
+ |
return; |
387 |
+ |
if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) |
388 |
+ |
nsamps = 1; |
389 |
+ |
oldsampndx = samplendx; |
390 |
+ |
samplendx = random()&0x7fff; /* randomize */ |
391 |
+ |
initsrcindex(&si); |
392 |
+ |
for (i = r->slights[0]; i > 0; i--) { /* for each source */ |
393 |
+ |
setcolor(cumval, 0., 0., 0.); |
394 |
+ |
lastt = r->rot; |
395 |
+ |
for (j = nsamps; j-- > 0; ) { /* for each sample position */ |
396 |
+ |
samplendx++; |
397 |
+ |
t = r->rot * (j+frandom())/nsamps; |
398 |
+ |
sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
399 |
+ |
sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
400 |
+ |
sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
401 |
+ |
sr.rmax = 0.; |
402 |
+ |
/* sample ray to this source */ |
403 |
+ |
if (si.sp >= si.np-1 || !srcray(&sr, NULL, &si) || |
404 |
+ |
sr.rsrc != r->slights[i]) { |
405 |
+ |
si.sn = r->slights[i]-1; /* reset */ |
406 |
+ |
si.np = 0; |
407 |
+ |
if (!srcray(&sr, NULL, &si) || |
408 |
+ |
sr.rsrc != r->slights[i]) |
409 |
+ |
continue; /* no path */ |
410 |
+ |
} |
411 |
+ |
copycolor(sr.cext, r->cext); |
412 |
+ |
sr.albedo = r->albedo; |
413 |
+ |
sr.gecc = r->gecc; |
414 |
+ |
rayvalue(&sr); /* eval. source ray */ |
415 |
+ |
if (bright(sr.rcol) <= FTINY) |
416 |
+ |
continue; |
417 |
+ |
/* compute fall-off */ |
418 |
+ |
d = lastt - t; |
419 |
+ |
setcolor(ctmp, 1.-d*colval(r->cext,RED), |
420 |
+ |
1.-d*colval(r->cext,GRN), |
421 |
+ |
1.-d*colval(r->cext,BLU)); |
422 |
+ |
multcolor(cumval, ctmp); |
423 |
+ |
lastt = t; |
424 |
+ |
if (r->gecc <= FTINY) /* compute P(theta) */ |
425 |
+ |
d = 1.; |
426 |
+ |
else { |
427 |
+ |
d = DOT(r->rdir, sr.rdir); |
428 |
+ |
d = sqrt(1. + r->gecc*r->gecc - 2.*r->gecc*d); |
429 |
+ |
d = (1. - r->gecc*r->gecc) / (d*d*d); |
430 |
+ |
} |
431 |
+ |
/* other factors */ |
432 |
+ |
d *= si.dom * r->albedo * r->rot / (4.*PI*nsamps); |
433 |
+ |
multcolor(sr.rcol, r->cext); |
434 |
+ |
scalecolor(sr.rcol, d); |
435 |
+ |
addcolor(cumval, sr.rcol); |
436 |
+ |
} |
437 |
+ |
/* final fall-off */ |
438 |
+ |
setcolor(ctmp, 1.-lastt*colval(r->cext,RED), |
439 |
+ |
1.-lastt*colval(r->cext,GRN), |
440 |
+ |
1.-lastt*colval(r->cext,BLU)); |
441 |
+ |
multcolor(cumval, ctmp); |
442 |
+ |
addcolor(r->rcol, cumval); /* sum into ray result */ |
443 |
+ |
} |
444 |
+ |
samplendx = oldsampndx; |
445 |
+ |
} |
446 |
+ |
|
447 |
+ |
|
448 |
|
/**************************************************************** |
449 |
|
* The following macros were separated from the m_light() routine |
450 |
|
* because they are very nasty and difficult to understand. |
486 |
|
* (Glows with negative radii should NEVER participate in illumination.) |
487 |
|
*/ |
488 |
|
|
489 |
< |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
489 |
> |
#define distglow(m, r, d) (m->otype==MAT_GLOW && \ |
490 |
|
m->oargs.farg[3] >= -FTINY && \ |
491 |
< |
r->rot > m->oargs.farg[3]) |
491 |
> |
d > m->oargs.farg[3]) |
492 |
|
|
493 |
|
/* badcomponent * |
494 |
|
* |
501 |
|
|
502 |
|
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
503 |
|
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
504 |
< |
distglow(m, r))) |
504 |
> |
/* not 100% correct */ distglow(m, r, r->rot))) |
505 |
|
|
506 |
|
/* passillum * |
507 |
|
* |
519 |
|
* The -dv flag is normally on for sources to be visible. |
520 |
|
*/ |
521 |
|
|
522 |
< |
#define srcignore(m, r) (!directvis && !(r->crtype&SHADOW) && \ |
523 |
< |
!distglow(m, r)) |
522 |
> |
#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
523 |
> |
distglow(m, r, raydist(r,PRIMARY))) |
524 |
|
|
525 |
|
|
526 |
|
m_light(m, r) /* ray hit a light source */ |
530 |
|
/* check for over-counting */ |
531 |
|
if (badcomponent(m, r)) |
532 |
|
return(1); |
533 |
< |
if (wrongsource(m,r)) |
533 |
> |
if (wrongsource(m, r)) |
534 |
|
return(1); |
535 |
|
/* check for passed illum */ |
536 |
|
if (passillum(m, r)) { |
547 |
|
if (srcignore(m, r)) |
548 |
|
return(1); |
549 |
|
/* check for outside spot */ |
550 |
< |
if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) |
550 |
> |
if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |
551 |
|
return(1); |
552 |
|
/* get distribution pattern */ |
553 |
|
raytexture(r, m->omod); |