1 |
< |
/* Copyright (c) 1994 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"; |
24 |
|
extern int maxdepth; /* maximum recursion depth */ |
25 |
|
extern double minweight; /* minimum ray weight */ |
26 |
|
extern int do_irrad; /* compute irradiance? */ |
27 |
+ |
extern COLOR ambval; /* ambient value */ |
28 |
|
|
29 |
+ |
extern COLOR cextinction; /* global extinction coefficient */ |
30 |
+ |
extern double salbedo; /* global scattering albedo */ |
31 |
+ |
extern double seccg; /* global scattering eccentricity */ |
32 |
+ |
extern double ssampdist; /* scatter sampling distance */ |
33 |
+ |
|
34 |
|
unsigned long raynum = 0; /* next unique ray number */ |
35 |
|
unsigned long nrays = 0; /* number of calls to localhit */ |
36 |
|
|
40 |
|
{0, 5, NULL, Lambfa}, NULL, |
41 |
|
}; /* a Lambertian surface */ |
42 |
|
|
43 |
+ |
OBJREC Aftplane; /* aft clipping plane object */ |
44 |
+ |
|
45 |
|
static int raymove(), checkset(), checkhit(); |
46 |
|
|
47 |
|
#define MAXLOOP 128 /* modifier loop detection */ |
61 |
|
r->rsrc = -1; |
62 |
|
r->clipset = NULL; |
63 |
|
r->revf = raytrace; |
64 |
+ |
copycolor(r->cext, cextinction); |
65 |
+ |
r->albedo = salbedo; |
66 |
+ |
r->gecc = seccg; |
67 |
+ |
r->slights = NULL; |
68 |
|
} else { /* spawned ray */ |
69 |
|
r->rlvl = ro->rlvl; |
70 |
|
if (rt & RAYREFL) { |
71 |
|
r->rlvl++; |
72 |
|
r->rsrc = -1; |
73 |
|
r->clipset = ro->clipset; |
74 |
+ |
r->rmax = 0.0; |
75 |
|
} else { |
76 |
|
r->rsrc = ro->rsrc; |
77 |
|
r->clipset = ro->newcset; |
78 |
+ |
r->rmax = ro->rmax <= FTINY ? 0.0 : ro->rmax - ro->rot; |
79 |
|
} |
80 |
|
r->revf = ro->revf; |
81 |
+ |
copycolor(r->cext, ro->cext); |
82 |
+ |
r->albedo = ro->albedo; |
83 |
+ |
r->gecc = ro->gecc; |
84 |
+ |
r->slights = ro->slights; |
85 |
|
r->rweight = ro->rweight * rw; |
86 |
|
r->crtype = ro->crtype | (r->rtype = rt); |
87 |
|
VCOPY(r->rorg, ro->rop); |
112 |
|
int gotmat; |
113 |
|
|
114 |
|
if (localhit(r, &thescene)) |
115 |
< |
gotmat = raycont(r); |
116 |
< |
else if (sourcehit(r)) |
117 |
< |
gotmat = rayshade(r, r->ro->omod); |
115 |
> |
gotmat = raycont(r); /* hit local surface, evaluate */ |
116 |
> |
else if (r->ro == &Aftplane) { |
117 |
> |
r->ro = NULL; /* hit aft clipping plane */ |
118 |
> |
r->rot = FHUGE; |
119 |
> |
} else if (sourcehit(r)) |
120 |
> |
gotmat = rayshade(r, r->ro->omod); /* distant source */ |
121 |
|
|
122 |
|
if (r->ro != NULL && !gotmat) |
123 |
|
objerror(r->ro, USER, "material not found"); |
124 |
|
|
125 |
+ |
rayparticipate(r); /* for participating medium */ |
126 |
+ |
|
127 |
|
if (trace != NULL) |
128 |
|
(*trace)(r); /* trace execution */ |
129 |
|
} |
192 |
|
} |
193 |
|
|
194 |
|
|
195 |
+ |
rayparticipate(r) /* compute ray medium participation */ |
196 |
+ |
register RAY *r; |
197 |
+ |
{ |
198 |
+ |
COLOR ce, ca; |
199 |
+ |
double dist; |
200 |
+ |
double re, ge, be; |
201 |
+ |
|
202 |
+ |
if (intens(r->cext) <= 1./FHUGE) |
203 |
+ |
return; /* no medium */ |
204 |
+ |
if ((dist = r->rot) >= FHUGE) |
205 |
+ |
dist = 2.*thescene.cusize; /* what to use for infinity? */ |
206 |
+ |
if (r->crtype & SHADOW) |
207 |
+ |
dist *= 1. - salbedo; /* no scattering for sources */ |
208 |
+ |
if (dist <= FTINY) |
209 |
+ |
return; /* no effective ray travel */ |
210 |
+ |
re = dist*colval(r->cext,RED); |
211 |
+ |
ge = dist*colval(r->cext,GRN); |
212 |
+ |
be = dist*colval(r->cext,BLU); |
213 |
+ |
setcolor(ce, re>92. ? 0. : exp(-re), |
214 |
+ |
ge>92. ? 0. : exp(-ge), |
215 |
+ |
be>92. ? 0. : exp(-be)); |
216 |
+ |
multcolor(r->rcol, ce); /* path absorption */ |
217 |
+ |
if (r->albedo <= FTINY || r->crtype & SHADOW) |
218 |
+ |
return; /* no scattering */ |
219 |
+ |
setcolor(ca, salbedo*colval(ambval,RED)*(1.-colval(ce,RED)), |
220 |
+ |
salbedo*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
221 |
+ |
salbedo*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
222 |
+ |
addcolor(r->rcol, ca); /* ambient in scattering */ |
223 |
+ |
srcscatter(r); /* source in scattering */ |
224 |
+ |
} |
225 |
+ |
|
226 |
+ |
|
227 |
|
raytexture(r, mod) /* get material modifiers */ |
228 |
|
RAY *r; |
229 |
|
int mod; |
242 |
|
error(USER, errmsg); |
243 |
|
} |
244 |
|
******/ |
245 |
< |
if ((*ofun[m->otype].funp)(m, r)) |
246 |
< |
objerror(r->ro, USER, "conflicting materials"); |
245 |
> |
if ((*ofun[m->otype].funp)(m, r)) { |
246 |
> |
sprintf(errmsg, "conflicting material \"%s\"", |
247 |
> |
m->oname); |
248 |
> |
objerror(r->ro, USER, errmsg); |
249 |
> |
} |
250 |
|
} |
251 |
|
depth--; /* end here */ |
252 |
|
} |
307 |
|
|
308 |
|
|
309 |
|
double |
310 |
+ |
raydist(r, flags) /* compute (cumulative) ray distance */ |
311 |
+ |
register RAY *r; |
312 |
+ |
register int flags; |
313 |
+ |
{ |
314 |
+ |
double sum = 0.0; |
315 |
+ |
|
316 |
+ |
while (r != NULL && r->crtype&flags) { |
317 |
+ |
sum += r->rot; |
318 |
+ |
r = r->parent; |
319 |
+ |
} |
320 |
+ |
return(sum); |
321 |
+ |
} |
322 |
+ |
|
323 |
+ |
|
324 |
+ |
double |
325 |
|
raynormal(norm, r) /* compute perturbed normal for ray */ |
326 |
|
FVECT norm; |
327 |
|
register RAY *r; |
426 |
|
} |
427 |
|
if (sflags == 0) |
428 |
|
error(CONSISTENCY, "zero ray direction in localhit"); |
429 |
+ |
/* start off assuming nothing hit */ |
430 |
+ |
if (r->rmax > FTINY) { /* except aft plane if one */ |
431 |
+ |
r->ro = &Aftplane; |
432 |
+ |
r->rot = r->rmax; |
433 |
+ |
for (i = 0; i < 3; i++) |
434 |
+ |
r->rop[i] = r->rorg[i] + r->rot*r->rdir[i]; |
435 |
+ |
} |
436 |
+ |
/* find global cube entrance point */ |
437 |
|
t = 0.0; |
438 |
|
if (!incube(scene, curpos)) { |
439 |
|
/* find distance to entry */ |
451 |
|
t = dt; /* farthest face is the one */ |
452 |
|
} |
453 |
|
t += FTINY; /* fudge to get inside cube */ |
454 |
+ |
if (t >= r->rot) /* clipped already */ |
455 |
+ |
return(0); |
456 |
|
/* advance position */ |
457 |
|
for (i = 0; i < 3; i++) |
458 |
|
curpos[i] += r->rdir[i]*t; |
461 |
|
return(0); |
462 |
|
} |
463 |
|
cxset[0] = 0; |
464 |
< |
return(raymove(curpos, cxset, sflags, r, scene) == RAYHIT); |
464 |
> |
raymove(curpos, cxset, sflags, r, scene); |
465 |
> |
return(r->ro != NULL & r->ro != &Aftplane); |
466 |
|
} |
467 |
|
|
468 |
|
|
517 |
|
} |
518 |
|
/*NOTREACHED*/ |
519 |
|
} |
520 |
< |
if (isfull(cu->cutree) && checkhit(r, cu, cxs)) |
520 |
> |
if (isfull(cu->cutree)) { |
521 |
> |
if (checkhit(r, cu, cxs)) |
522 |
> |
return(RAYHIT); |
523 |
> |
} else if (r->ro == &Aftplane && incube(cu, r->rop)) |
524 |
|
return(RAYHIT); |
525 |
|
/* advance to next cube */ |
526 |
|
if (dirf&0x11) { |