13 |
|
#include "source.h" |
14 |
|
#include "otypes.h" |
15 |
|
#include "otspecial.h" |
16 |
+ |
#include "random.h" |
17 |
+ |
#include "pmap.h" |
18 |
|
|
19 |
|
#define MAXCSET ((MAXSET+1)*2-1) /* maximum check set size */ |
20 |
|
|
21 |
< |
unsigned long raynum = 0; /* next unique ray number */ |
22 |
< |
unsigned long nrays = 0; /* number of calls to localhit */ |
21 |
> |
RNUMBER raynum = 0; /* next unique ray number */ |
22 |
> |
RNUMBER nrays = 0; /* number of calls to localhit */ |
23 |
|
|
24 |
|
static RREAL Lambfa[5] = {PI, PI, PI, 0.0, 0.0}; |
25 |
|
OBJREC Lamb = { |
26 |
|
OVOID, MAT_PLASTIC, "Lambertian", |
27 |
< |
{0, 5, NULL, Lambfa}, NULL, |
27 |
> |
{NULL, Lambfa, 0, 5}, NULL |
28 |
|
}; /* a Lambertian surface */ |
29 |
|
|
30 |
|
OBJREC Aftplane; /* aft clipping plane object */ |
36 |
|
static void checkset(OBJECT *os, OBJECT *cs); |
37 |
|
|
38 |
|
|
39 |
< |
extern int |
39 |
> |
int |
40 |
|
rayorigin( /* start new ray from old one */ |
41 |
< |
register RAY *r, |
40 |
< |
register RAY *ro, |
41 |
> |
RAY *r, |
42 |
|
int rt, |
43 |
< |
double rw |
43 |
> |
const RAY *ro, |
44 |
> |
const COLOR rc |
45 |
|
) |
46 |
|
{ |
47 |
< |
double re; |
48 |
< |
|
47 |
> |
double rw, re; |
48 |
> |
/* assign coefficient/weight */ |
49 |
> |
if (rc == NULL) { |
50 |
> |
rw = 1.0; |
51 |
> |
setcolor(r->rcoef, 1., 1., 1.); |
52 |
> |
} else { |
53 |
> |
rw = intens(rc); |
54 |
> |
if (rc != r->rcoef) |
55 |
> |
copycolor(r->rcoef, rc); |
56 |
> |
} |
57 |
|
if ((r->parent = ro) == NULL) { /* primary ray */ |
58 |
|
r->rlvl = 0; |
59 |
|
r->rweight = rw; |
60 |
|
r->crtype = r->rtype = rt; |
61 |
|
r->rsrc = -1; |
62 |
|
r->clipset = NULL; |
63 |
+ |
r->revf = raytrace; |
64 |
|
copycolor(r->cext, cextinction); |
65 |
|
copycolor(r->albedo, salbedo); |
66 |
|
r->gecc = seccg; |
67 |
|
r->slights = NULL; |
57 |
– |
} else if (ro->rot >= FHUGE) { /* illegal continuation */ |
58 |
– |
memset(r, 0, sizeof(RAY)); |
59 |
– |
return(-1); |
68 |
|
} else { /* spawned ray */ |
69 |
+ |
if (ro->rot >= FHUGE) { |
70 |
+ |
memset(r, 0, sizeof(RAY)); |
71 |
+ |
return(-1); /* illegal continuation */ |
72 |
+ |
} |
73 |
|
r->rlvl = ro->rlvl; |
74 |
|
if (rt & RAYREFL) { |
75 |
|
r->rlvl++; |
81 |
|
r->clipset = ro->newcset; |
82 |
|
r->rmax = ro->rmax <= FTINY ? 0.0 : ro->rmax - ro->rot; |
83 |
|
} |
84 |
+ |
r->revf = ro->revf; |
85 |
|
copycolor(r->cext, ro->cext); |
86 |
|
copycolor(r->albedo, ro->albedo); |
87 |
|
r->gecc = ro->gecc; |
89 |
|
r->crtype = ro->crtype | (r->rtype = rt); |
90 |
|
VCOPY(r->rorg, ro->rop); |
91 |
|
r->rweight = ro->rweight * rw; |
92 |
< |
/* estimate absorption */ |
92 |
> |
/* estimate extinction */ |
93 |
|
re = colval(ro->cext,RED) < colval(ro->cext,GRN) ? |
94 |
|
colval(ro->cext,RED) : colval(ro->cext,GRN); |
95 |
|
if (colval(ro->cext,BLU) < re) re = colval(ro->cext,BLU); |
96 |
< |
if (re > 0.) |
97 |
< |
r->rweight *= exp(-re*ro->rot); |
96 |
> |
re *= ro->rot; |
97 |
> |
if (re > 0.1) { |
98 |
> |
if (re > 92.) { |
99 |
> |
r->rweight = 0.0; |
100 |
> |
} else { |
101 |
> |
r->rweight *= exp(-re); |
102 |
> |
} |
103 |
> |
} |
104 |
|
} |
105 |
|
rayclear(r); |
106 |
< |
return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
106 |
> |
if (r->rweight <= 0.0) /* check for expiration */ |
107 |
> |
return(-1); |
108 |
> |
if (r->crtype & SHADOW) /* shadow commitment */ |
109 |
> |
return(0); |
110 |
> |
if (maxdepth <= 0 && rc != NULL) { /* Russian roulette */ |
111 |
> |
if (minweight <= 0.0) |
112 |
> |
error(USER, "zero ray weight in Russian roulette"); |
113 |
> |
if (maxdepth < 0 && r->rlvl > -maxdepth) |
114 |
> |
return(-1); /* upper reflection limit */ |
115 |
> |
if (r->rweight >= minweight) |
116 |
> |
return(0); |
117 |
> |
if (frandom() > r->rweight/minweight) |
118 |
> |
return(-1); |
119 |
> |
rw = minweight/r->rweight; /* promote survivor */ |
120 |
> |
scalecolor(r->rcoef, rw); |
121 |
> |
r->rweight = minweight; |
122 |
> |
return(0); |
123 |
> |
} |
124 |
> |
return(r->rweight >= minweight && r->rlvl <= abs(maxdepth) ? 0 : -1); |
125 |
|
} |
126 |
|
|
127 |
|
|
128 |
< |
extern void |
128 |
> |
void |
129 |
|
rayclear( /* clear a ray for (re)evaluation */ |
130 |
< |
register RAY *r |
130 |
> |
RAY *r |
131 |
|
) |
132 |
|
{ |
133 |
|
r->rno = raynum++; |
144 |
|
} |
145 |
|
|
146 |
|
|
147 |
< |
extern void |
148 |
< |
rayvalue( /* trace a ray and compute its value */ |
147 |
> |
void |
148 |
> |
raytrace( /* trace a ray and compute its value */ |
149 |
|
RAY *r |
150 |
|
) |
151 |
|
{ |
157 |
|
} else if (sourcehit(r)) |
158 |
|
rayshade(r, r->ro->omod); /* distant source */ |
159 |
|
|
123 |
– |
rayparticipate(r); /* for participating medium */ |
124 |
– |
|
160 |
|
if (trace != NULL) |
161 |
|
(*trace)(r); /* trace execution */ |
162 |
+ |
|
163 |
+ |
rayparticipate(r); /* for participating medium */ |
164 |
|
} |
165 |
|
|
166 |
|
|
167 |
< |
extern void |
167 |
> |
void |
168 |
|
raycont( /* check for clipped object and continue */ |
169 |
< |
register RAY *r |
169 |
> |
RAY *r |
170 |
|
) |
171 |
|
{ |
172 |
|
if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
175 |
|
} |
176 |
|
|
177 |
|
|
178 |
< |
extern void |
178 |
> |
void |
179 |
|
raytrans( /* transmit ray as is */ |
180 |
< |
register RAY *r |
180 |
> |
RAY *r |
181 |
|
) |
182 |
|
{ |
183 |
|
RAY tr; |
184 |
|
|
185 |
< |
if (rayorigin(&tr, r, TRANS, 1.0) == 0) { |
185 |
> |
if (rayorigin(&tr, TRANS, r, NULL) == 0) { |
186 |
|
VCOPY(tr.rdir, r->rdir); |
187 |
|
rayvalue(&tr); |
188 |
|
copycolor(r->rcol, tr.rcol); |
191 |
|
} |
192 |
|
|
193 |
|
|
194 |
< |
extern int |
194 |
> |
int |
195 |
|
rayshade( /* shade ray r with material mod */ |
196 |
< |
register RAY *r, |
196 |
> |
RAY *r, |
197 |
|
int mod |
198 |
|
) |
199 |
|
{ |
200 |
< |
register OBJREC *m; |
200 |
> |
OBJREC *m; |
201 |
|
|
202 |
|
r->rt = r->rot; /* set effective ray length */ |
203 |
|
for ( ; mod != OVOID; mod = m->omod) { |
226 |
|
} |
227 |
|
|
228 |
|
|
229 |
< |
extern void |
229 |
> |
void |
230 |
|
rayparticipate( /* compute ray medium participation */ |
231 |
< |
register RAY *r |
231 |
> |
RAY *r |
232 |
|
) |
233 |
|
{ |
234 |
|
COLOR ce, ca; |
244 |
|
ge *= 1. - colval(r->albedo,GRN); |
245 |
|
be *= 1. - colval(r->albedo,BLU); |
246 |
|
} |
247 |
< |
setcolor(ce, re<=0. ? 1. : re>92. ? 0. : exp(-re), |
248 |
< |
ge<=0. ? 1. : ge>92. ? 0. : exp(-ge), |
249 |
< |
be<=0. ? 1. : be>92. ? 0. : exp(-be)); |
250 |
< |
multcolor(r->rcol, ce); /* path absorption */ |
247 |
> |
setcolor(ce, re<=FTINY ? 1. : re>92. ? 0. : exp(-re), |
248 |
> |
ge<=FTINY ? 1. : ge>92. ? 0. : exp(-ge), |
249 |
> |
be<=FTINY ? 1. : be>92. ? 0. : exp(-be)); |
250 |
> |
multcolor(r->rcol, ce); /* path extinction */ |
251 |
|
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
252 |
|
return; /* no scattering */ |
253 |
< |
setcolor(ca, |
254 |
< |
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
255 |
< |
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
256 |
< |
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
257 |
< |
addcolor(r->rcol, ca); /* ambient in scattering */ |
253 |
> |
|
254 |
> |
/* PMAP: indirect inscattering accounted for by volume photons? */ |
255 |
> |
if (!volumePhotonMapping) { |
256 |
> |
setcolor(ca, |
257 |
> |
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
258 |
> |
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
259 |
> |
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
260 |
> |
addcolor(r->rcol, ca); /* ambient in scattering */ |
261 |
> |
} |
262 |
> |
|
263 |
|
srcscatter(r); /* source in scattering */ |
264 |
|
} |
265 |
|
|
266 |
|
|
267 |
< |
extern void |
267 |
> |
void |
268 |
|
raytexture( /* get material modifiers */ |
269 |
|
RAY *r, |
270 |
|
OBJECT mod |
271 |
|
) |
272 |
|
{ |
273 |
< |
register OBJREC *m; |
273 |
> |
OBJREC *m; |
274 |
|
/* execute textures and patterns */ |
275 |
|
for ( ; mod != OVOID; mod = m->omod) { |
276 |
|
m = objptr(mod); |
289 |
|
} |
290 |
|
|
291 |
|
|
292 |
< |
extern int |
292 |
> |
int |
293 |
|
raymixture( /* mix modifiers */ |
294 |
< |
register RAY *r, |
294 |
> |
RAY *r, |
295 |
|
OBJECT fore, |
296 |
|
OBJECT back, |
297 |
|
double coef |
299 |
|
{ |
300 |
|
RAY fr, br; |
301 |
|
int foremat, backmat; |
302 |
< |
register int i; |
302 |
> |
int i; |
303 |
|
/* bound coefficient */ |
304 |
|
if (coef > 1.0) |
305 |
|
coef = 1.0; |
309 |
|
foremat = backmat = 0; |
310 |
|
/* foreground */ |
311 |
|
fr = *r; |
312 |
< |
if (coef > FTINY) |
312 |
> |
if (coef > FTINY) { |
313 |
> |
fr.rweight *= coef; |
314 |
> |
scalecolor(fr.rcoef, coef); |
315 |
|
foremat = rayshade(&fr, fore); |
316 |
+ |
} |
317 |
|
/* background */ |
318 |
|
br = *r; |
319 |
< |
if (coef < 1.0-FTINY) |
319 |
> |
if (coef < 1.0-FTINY) { |
320 |
> |
br.rweight *= 1.0-coef; |
321 |
> |
scalecolor(br.rcoef, 1.0-coef); |
322 |
|
backmat = rayshade(&br, back); |
323 |
+ |
} |
324 |
|
/* check for transparency */ |
325 |
|
if (backmat ^ foremat) { |
326 |
|
if (backmat && coef > FTINY) |
349 |
|
} |
350 |
|
|
351 |
|
|
352 |
< |
extern double |
352 |
> |
double |
353 |
|
raydist( /* compute (cumulative) ray distance */ |
354 |
< |
register RAY *r, |
355 |
< |
register int flags |
354 |
> |
const RAY *r, |
355 |
> |
int flags |
356 |
|
) |
357 |
|
{ |
358 |
|
double sum = 0.0; |
365 |
|
} |
366 |
|
|
367 |
|
|
368 |
< |
extern double |
368 |
> |
void |
369 |
> |
raycontrib( /* compute (cumulative) ray contribution */ |
370 |
> |
RREAL rc[3], |
371 |
> |
const RAY *r, |
372 |
> |
int flags |
373 |
> |
) |
374 |
> |
{ |
375 |
> |
double eext[3]; |
376 |
> |
int i; |
377 |
> |
|
378 |
> |
eext[0] = eext[1] = eext[2] = 0.; |
379 |
> |
rc[0] = rc[1] = rc[2] = 1.; |
380 |
> |
|
381 |
> |
while (r != NULL && r->crtype&flags) { |
382 |
> |
for (i = 3; i--; ) { |
383 |
> |
rc[i] *= colval(r->rcoef,i); |
384 |
> |
eext[i] += r->rot * colval(r->cext,i); |
385 |
> |
} |
386 |
> |
r = r->parent; |
387 |
> |
} |
388 |
> |
for (i = 3; i--; ) |
389 |
> |
rc[i] *= (eext[i] <= FTINY) ? 1. : |
390 |
> |
(eext[i] > 92.) ? 0. : exp(-eext[i]); |
391 |
> |
} |
392 |
> |
|
393 |
> |
|
394 |
> |
double |
395 |
|
raynormal( /* compute perturbed normal for ray */ |
396 |
|
FVECT norm, |
397 |
< |
register RAY *r |
397 |
> |
RAY *r |
398 |
|
) |
399 |
|
{ |
400 |
|
double newdot; |
401 |
< |
register int i; |
401 |
> |
int i; |
402 |
|
|
403 |
|
/* The perturbation is added to the surface normal to obtain |
404 |
|
* the new normal. If the new normal would affect the surface |
427 |
|
} |
428 |
|
|
429 |
|
|
430 |
< |
extern void |
430 |
> |
void |
431 |
|
newrayxf( /* get new tranformation matrix for ray */ |
432 |
|
RAY *r |
433 |
|
) |
436 |
|
struct xfn *next; |
437 |
|
FULLXF xf; |
438 |
|
} xfseed = { &xfseed }, *xflast = &xfseed; |
439 |
< |
register struct xfn *xp; |
440 |
< |
register RAY *rp; |
439 |
> |
struct xfn *xp; |
440 |
> |
const RAY *rp; |
441 |
|
|
442 |
|
/* |
443 |
|
* Search for transform in circular list that |
448 |
|
if (rp->rox == &xp->xf) { /* xp in use */ |
449 |
|
xp = xp->next; /* move to next */ |
450 |
|
if (xp == xflast) { /* need new one */ |
451 |
< |
xp = (struct xfn *)malloc(sizeof(struct xfn)); |
451 |
> |
xp = (struct xfn *)bmalloc(sizeof(struct xfn)); |
452 |
|
if (xp == NULL) |
453 |
|
error(SYSTEM, |
454 |
|
"out of memory in newrayxf"); |
465 |
|
} |
466 |
|
|
467 |
|
|
468 |
< |
extern void |
468 |
> |
void |
469 |
|
flipsurface( /* reverse surface orientation */ |
470 |
< |
register RAY *r |
470 |
> |
RAY *r |
471 |
|
) |
472 |
|
{ |
473 |
|
r->rod = -r->rod; |
480 |
|
} |
481 |
|
|
482 |
|
|
483 |
< |
extern void |
483 |
> |
void |
484 |
|
rayhit( /* standard ray hit test */ |
485 |
|
OBJECT *oset, |
486 |
|
RAY *r |
497 |
|
} |
498 |
|
|
499 |
|
|
500 |
< |
extern int |
500 |
> |
int |
501 |
|
localhit( /* check for hit in the octree */ |
502 |
< |
register RAY *r, |
503 |
< |
register CUBE *scene |
502 |
> |
RAY *r, |
503 |
> |
CUBE *scene |
504 |
|
) |
505 |
|
{ |
506 |
|
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
507 |
|
FVECT curpos; /* current cube position */ |
508 |
|
int sflags; /* sign flags */ |
509 |
|
double t, dt; |
510 |
< |
register int i; |
510 |
> |
int i; |
511 |
|
|
512 |
|
nrays++; /* increment trace counter */ |
513 |
|
sflags = 0; |
518 |
|
else if (r->rdir[i] < -1e-7) |
519 |
|
sflags |= 0x10 << i; |
520 |
|
} |
521 |
< |
if (sflags == 0) |
522 |
< |
error(CONSISTENCY, "zero ray direction in localhit"); |
521 |
> |
if (!sflags) { |
522 |
> |
error(WARNING, "zero ray direction in localhit"); |
523 |
> |
return(0); |
524 |
> |
} |
525 |
|
/* start off assuming nothing hit */ |
526 |
|
if (r->rmax > FTINY) { /* except aft plane if one */ |
527 |
|
r->ro = &Aftplane; |
528 |
|
r->rot = r->rmax; |
529 |
< |
for (i = 0; i < 3; i++) |
454 |
< |
r->rop[i] = r->rorg[i] + r->rot*r->rdir[i]; |
529 |
> |
VSUM(r->rop, r->rorg, r->rdir, r->rot); |
530 |
|
} |
531 |
|
/* find global cube entrance point */ |
532 |
|
t = 0.0; |
549 |
|
if (t >= r->rot) /* clipped already */ |
550 |
|
return(0); |
551 |
|
/* advance position */ |
552 |
< |
for (i = 0; i < 3; i++) |
478 |
< |
curpos[i] += r->rdir[i]*t; |
552 |
> |
VSUM(curpos, curpos, r->rdir, t); |
553 |
|
|
554 |
|
if (!incube(scene, curpos)) /* non-intersecting ray */ |
555 |
|
return(0); |
565 |
|
FVECT pos, /* current position, modified herein */ |
566 |
|
OBJECT *cxs, /* checked objects, modified by checkhit */ |
567 |
|
int dirf, /* direction indicators to speed tests */ |
568 |
< |
register RAY *r, |
569 |
< |
register CUBE *cu |
568 |
> |
RAY *r, |
569 |
> |
CUBE *cu |
570 |
|
) |
571 |
|
{ |
572 |
|
int ax; |
574 |
|
|
575 |
|
if (istree(cu->cutree)) { /* recurse on subcubes */ |
576 |
|
CUBE cukid; |
577 |
< |
register int br, sgn; |
577 |
> |
int br, sgn; |
578 |
|
|
579 |
|
cukid.cusize = cu->cusize * 0.5; /* find subcube */ |
580 |
|
VCOPY(cukid.cuorg, cu->cuorg); |
640 |
|
ax = 2; |
641 |
|
} |
642 |
|
} |
643 |
< |
pos[0] += r->rdir[0]*t; |
570 |
< |
pos[1] += r->rdir[1]*t; |
571 |
< |
pos[2] += r->rdir[2]*t; |
643 |
> |
VSUM(pos, pos, r->rdir, t); |
644 |
|
return(ax); |
645 |
|
} |
646 |
|
|
647 |
|
|
648 |
|
static int |
649 |
|
checkhit( /* check for hit in full cube */ |
650 |
< |
register RAY *r, |
650 |
> |
RAY *r, |
651 |
|
CUBE *cu, |
652 |
|
OBJECT *cxs |
653 |
|
) |
668 |
|
|
669 |
|
static void |
670 |
|
checkset( /* modify checked set and set to check */ |
671 |
< |
register OBJECT *os, /* os' = os - cs */ |
672 |
< |
register OBJECT *cs /* cs' = cs + os */ |
671 |
> |
OBJECT *os, /* os' = os - cs */ |
672 |
> |
OBJECT *cs /* cs' = cs + os */ |
673 |
|
) |
674 |
|
{ |
675 |
|
OBJECT cset[MAXCSET+MAXSET+1]; |
676 |
< |
register int i, j; |
676 |
> |
int i, j; |
677 |
|
int k; |
678 |
|
/* copy os in place, cset <- cs */ |
679 |
|
cset[0] = 0; |