1 |
< |
/* Copyright (c) 1990 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1991 Regents of the University of California */ |
2 |
|
|
3 |
|
#ifndef lint |
4 |
|
static char SCCSid[] = "$SunId$ LBL"; |
16 |
|
|
17 |
|
#include "otypes.h" |
18 |
|
|
19 |
+ |
#include "otspecial.h" |
20 |
+ |
|
21 |
|
extern CUBE thescene; /* our scene */ |
22 |
|
extern int maxdepth; /* maximum recursion depth */ |
23 |
|
extern double minweight; /* minimum ray weight */ |
24 |
+ |
extern int do_irrad; /* compute irradiance? */ |
25 |
|
|
26 |
< |
long nrays = 0L; /* number of rays traced */ |
26 |
> |
long raynum = 0L; /* next unique ray number */ |
27 |
> |
long nrays = 0L; /* number of calls to localhit */ |
28 |
|
|
29 |
+ |
static FLOAT Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
30 |
+ |
OBJREC Lamb = { |
31 |
+ |
OVOID, MAT_PLASTIC, "Lambertian", |
32 |
+ |
{0, 5, NULL, Lambfa}, NULL, |
33 |
+ |
}; /* a Lambertian surface */ |
34 |
+ |
|
35 |
|
#define MAXLOOP 128 /* modifier loop detection */ |
36 |
|
|
37 |
|
#define RAYHIT (-1) /* return value for intercepted ray */ |
48 |
|
r->crtype = r->rtype = rt; |
49 |
|
r->rsrc = -1; |
50 |
|
r->clipset = NULL; |
51 |
+ |
r->revf = raytrace; |
52 |
|
} else { /* spawned ray */ |
53 |
|
r->rlvl = ro->rlvl; |
54 |
|
if (rt & RAYREFL) { |
59 |
|
r->rsrc = ro->rsrc; |
60 |
|
r->clipset = ro->newcset; |
61 |
|
} |
62 |
+ |
r->revf = ro->revf; |
63 |
|
r->rweight = ro->rweight * rw; |
64 |
|
r->crtype = ro->crtype | (r->rtype = rt); |
65 |
|
VCOPY(r->rorg, ro->rop); |
66 |
|
} |
67 |
< |
r->rno = nrays; |
67 |
> |
rayclear(r); |
68 |
> |
return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
69 |
> |
} |
70 |
> |
|
71 |
> |
|
72 |
> |
rayclear(r) /* clear a ray for (re)evaluation */ |
73 |
> |
register RAY *r; |
74 |
> |
{ |
75 |
> |
r->rno = raynum++; |
76 |
> |
r->cxs[0] = 0; |
77 |
|
r->newcset = r->clipset; |
78 |
|
r->ro = NULL; |
79 |
|
r->rot = FHUGE; |
81 |
|
setcolor(r->pcol, 1.0, 1.0, 1.0); |
82 |
|
setcolor(r->rcol, 0.0, 0.0, 0.0); |
83 |
|
r->rt = 0.0; |
63 |
– |
return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
84 |
|
} |
85 |
|
|
86 |
|
|
87 |
< |
rayvalue(r) /* compute a ray's value */ |
87 |
> |
raytrace(r) /* trace a ray and compute its value */ |
88 |
|
RAY *r; |
89 |
|
{ |
90 |
|
extern int (*trace)(); |
91 |
|
|
92 |
< |
if (localhit(r, &thescene) || sourcehit(r)) |
92 |
> |
if (localhit(r, &thescene)) |
93 |
|
raycont(r); |
94 |
+ |
else if (sourcehit(r)) |
95 |
+ |
rayshade(r, r->ro->omod); |
96 |
|
|
97 |
|
if (trace != NULL) |
98 |
|
(*trace)(r); /* trace execution */ |
132 |
|
/* check for infinite loop */ |
133 |
|
if (depth++ >= MAXLOOP) |
134 |
|
objerror(r->ro, USER, "possible modifier loop"); |
135 |
+ |
r->rt = r->rot; /* set effective ray length */ |
136 |
|
for ( ; mod != OVOID; mod = m->omod) { |
137 |
|
m = objptr(mod); |
138 |
|
/****** unnecessary test since modifier() is always called |
141 |
|
error(USER, errmsg); |
142 |
|
} |
143 |
|
******/ |
144 |
+ |
/* hack for irradiance calculation */ |
145 |
+ |
if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS))) { |
146 |
+ |
if (irr_ignore(m->otype)) { |
147 |
+ |
depth--; |
148 |
+ |
raytrans(r); |
149 |
+ |
return; |
150 |
+ |
} |
151 |
+ |
if (!islight(m->otype)) |
152 |
+ |
m = &Lamb; |
153 |
+ |
} |
154 |
|
(*ofun[m->otype].funp)(m, r); /* execute function */ |
122 |
– |
m->lastrno = r->rno; |
155 |
|
if (ismaterial(m->otype)) { /* materials call raytexture */ |
156 |
|
depth--; |
157 |
|
return; /* we're done */ |
178 |
|
error(USER, errmsg); |
179 |
|
} |
180 |
|
(*ofun[m->otype].funp)(m, r); |
149 |
– |
m->lastrno = r->rno; |
181 |
|
} |
182 |
|
depth--; /* end here */ |
183 |
|
} |
283 |
|
if (rp->rox == &xp->xf) { /* xp in use */ |
284 |
|
xp = xp->next; /* move to next */ |
285 |
|
if (xp == xflast) { /* need new one */ |
286 |
< |
xp = (struct xfn *)malloc(sizeof(struct xfn)); |
286 |
> |
xp = (struct xfn *)bmalloc(sizeof(struct xfn)); |
287 |
|
if (xp == NULL) |
288 |
|
error(SYSTEM, |
289 |
|
"out of memory in newrayxf"); |
323 |
|
register int i; |
324 |
|
|
325 |
|
nrays++; /* increment trace counter */ |
295 |
– |
|
326 |
|
sflags = 0; |
327 |
|
for (i = 0; i < 3; i++) { |
328 |
|
curpos[i] = r->rorg[i]; |
331 |
|
else if (r->rdir[i] < -FTINY) |
332 |
|
sflags |= 0x10 << i; |
333 |
|
} |
334 |
+ |
if (sflags == 0) |
335 |
+ |
error(CONSISTENCY, "zero ray direction in localhit"); |
336 |
|
t = 0.0; |
337 |
|
if (!incube(scene, curpos)) { |
338 |
|
/* find distance to entry */ |
453 |
|
register int i; |
454 |
|
|
455 |
|
objset(oset, cu->cutree); |
456 |
+ |
checkset(oset, r->cxs); /* eliminate double-checking */ |
457 |
|
for (i = oset[0]; i > 0; i--) { |
458 |
|
o = objptr(oset[i]); |
426 |
– |
if (o->lastrno == r->rno) /* checked already? */ |
427 |
– |
continue; |
459 |
|
(*ofun[o->otype].funp)(o, r); |
429 |
– |
o->lastrno = r->rno; |
460 |
|
} |
461 |
|
if (r->ro == NULL) |
462 |
|
return(0); /* no scores yet */ |
463 |
|
|
464 |
|
return(incube(cu, r->rop)); /* hit OK if in current cube */ |
465 |
+ |
} |
466 |
+ |
|
467 |
+ |
|
468 |
+ |
static |
469 |
+ |
checkset(os, cs) /* modify checked set and set to check */ |
470 |
+ |
register OBJECT os[MAXSET+1]; /* os' = os - cs */ |
471 |
+ |
register OBJECT cs[MAXCSET+1]; /* cs' = cs + os */ |
472 |
+ |
{ |
473 |
+ |
OBJECT cset[MAXCSET+MAXSET+1]; |
474 |
+ |
register int i, j, k; |
475 |
+ |
/* copy os in place, cset <- cs */ |
476 |
+ |
cset[0] = 0; |
477 |
+ |
k = 0; |
478 |
+ |
for (i = j = 1; i <= os[0]; i++) { |
479 |
+ |
while (j <= cs[0] && cs[j] < os[i]) |
480 |
+ |
cset[++cset[0]] = cs[j++]; |
481 |
+ |
if (j > cs[0] || os[i] != cs[j]) { /* object to check */ |
482 |
+ |
os[++k] = os[i]; |
483 |
+ |
cset[++cset[0]] = os[i]; |
484 |
+ |
} |
485 |
+ |
} |
486 |
+ |
while (j <= cs[0]) /* get the rest of cs */ |
487 |
+ |
cset[++cset[0]] = cs[j++]; |
488 |
+ |
if (cset[0] > MAXCSET) /* truncate if necessary */ |
489 |
+ |
cset[0] = MAXCSET; |
490 |
+ |
setcopy(cs, cset); /* copy new "checked" set back */ |
491 |
+ |
os[0] = k; /* new "to check" set size */ |
492 |
|
} |