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 (rw > 1.0) |
55 |
> |
rw = 1.0; /* avoid calculation growth */ |
56 |
> |
if (rc != r->rcoef) |
57 |
> |
copycolor(r->rcoef, rc); |
58 |
> |
} |
59 |
|
if ((r->parent = ro) == NULL) { /* primary ray */ |
60 |
|
r->rlvl = 0; |
61 |
|
r->rweight = rw; |
62 |
|
r->crtype = r->rtype = rt; |
63 |
|
r->rsrc = -1; |
64 |
|
r->clipset = NULL; |
65 |
+ |
r->revf = raytrace; |
66 |
|
copycolor(r->cext, cextinction); |
67 |
|
copycolor(r->albedo, salbedo); |
68 |
|
r->gecc = seccg; |
69 |
|
r->slights = NULL; |
57 |
– |
} else if (ro->rot >= FHUGE) { /* illegal continuation */ |
58 |
– |
memset(r, 0, sizeof(RAY)); |
59 |
– |
return(-1); |
70 |
|
} else { /* spawned ray */ |
71 |
+ |
if (ro->rot >= FHUGE) { |
72 |
+ |
memset(r, 0, sizeof(RAY)); |
73 |
+ |
return(-1); /* illegal continuation */ |
74 |
+ |
} |
75 |
|
r->rlvl = ro->rlvl; |
76 |
|
if (rt & RAYREFL) { |
77 |
|
r->rlvl++; |
83 |
|
r->clipset = ro->newcset; |
84 |
|
r->rmax = ro->rmax <= FTINY ? 0.0 : ro->rmax - ro->rot; |
85 |
|
} |
86 |
+ |
r->revf = ro->revf; |
87 |
|
copycolor(r->cext, ro->cext); |
88 |
|
copycolor(r->albedo, ro->albedo); |
89 |
|
r->gecc = ro->gecc; |
91 |
|
r->crtype = ro->crtype | (r->rtype = rt); |
92 |
|
VCOPY(r->rorg, ro->rop); |
93 |
|
r->rweight = ro->rweight * rw; |
94 |
< |
/* estimate absorption */ |
94 |
> |
/* estimate extinction */ |
95 |
|
re = colval(ro->cext,RED) < colval(ro->cext,GRN) ? |
96 |
|
colval(ro->cext,RED) : colval(ro->cext,GRN); |
97 |
|
if (colval(ro->cext,BLU) < re) re = colval(ro->cext,BLU); |
98 |
< |
if (re > 0.) |
99 |
< |
r->rweight *= exp(-re*ro->rot); |
98 |
> |
re *= ro->rot; |
99 |
> |
if (re > 0.1) { |
100 |
> |
if (re > 92.) { |
101 |
> |
r->rweight = 0.0; |
102 |
> |
} else { |
103 |
> |
r->rweight *= exp(-re); |
104 |
> |
} |
105 |
> |
} |
106 |
|
} |
107 |
|
rayclear(r); |
108 |
< |
return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
108 |
> |
if (r->rweight <= 0.0) /* check for expiration */ |
109 |
> |
return(-1); |
110 |
> |
if (r->crtype & SHADOW) /* shadow commitment */ |
111 |
> |
return(0); |
112 |
> |
/* ambient in photon map? */ |
113 |
> |
if (ro != NULL && ro->crtype & AMBIENT) { |
114 |
> |
if (causticPhotonMapping) |
115 |
> |
return(-1); |
116 |
> |
if (photonMapping && rt != TRANS) |
117 |
> |
return(-1); |
118 |
> |
} |
119 |
> |
if (maxdepth <= 0 && rc != NULL) { /* Russian roulette */ |
120 |
> |
if (minweight <= 0.0) |
121 |
> |
error(USER, "zero ray weight in Russian roulette"); |
122 |
> |
if (maxdepth < 0 && r->rlvl > -maxdepth) |
123 |
> |
return(-1); /* upper reflection limit */ |
124 |
> |
if (r->rweight >= minweight) |
125 |
> |
return(0); |
126 |
> |
if (frandom() > r->rweight/minweight) |
127 |
> |
return(-1); |
128 |
> |
rw = minweight/r->rweight; /* promote survivor */ |
129 |
> |
scalecolor(r->rcoef, rw); |
130 |
> |
r->rweight = minweight; |
131 |
> |
return(0); |
132 |
> |
} |
133 |
> |
return(r->rweight >= minweight && r->rlvl <= abs(maxdepth) ? 0 : -1); |
134 |
|
} |
135 |
|
|
136 |
|
|
137 |
< |
extern void |
137 |
> |
void |
138 |
|
rayclear( /* clear a ray for (re)evaluation */ |
139 |
< |
register RAY *r |
139 |
> |
RAY *r |
140 |
|
) |
141 |
|
{ |
142 |
|
r->rno = raynum++; |
153 |
|
} |
154 |
|
|
155 |
|
|
156 |
< |
extern void |
157 |
< |
rayvalue( /* trace a ray and compute its value */ |
156 |
> |
void |
157 |
> |
raytrace( /* trace a ray and compute its value */ |
158 |
|
RAY *r |
159 |
|
) |
160 |
|
{ |
166 |
|
} else if (sourcehit(r)) |
167 |
|
rayshade(r, r->ro->omod); /* distant source */ |
168 |
|
|
123 |
– |
rayparticipate(r); /* for participating medium */ |
124 |
– |
|
169 |
|
if (trace != NULL) |
170 |
|
(*trace)(r); /* trace execution */ |
171 |
+ |
|
172 |
+ |
rayparticipate(r); /* for participating medium */ |
173 |
|
} |
174 |
|
|
175 |
|
|
176 |
< |
extern void |
176 |
> |
void |
177 |
|
raycont( /* check for clipped object and continue */ |
178 |
< |
register RAY *r |
178 |
> |
RAY *r |
179 |
|
) |
180 |
|
{ |
181 |
|
if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
184 |
|
} |
185 |
|
|
186 |
|
|
187 |
< |
extern void |
187 |
> |
void |
188 |
|
raytrans( /* transmit ray as is */ |
189 |
< |
register RAY *r |
189 |
> |
RAY *r |
190 |
|
) |
191 |
|
{ |
192 |
|
RAY tr; |
193 |
|
|
194 |
< |
if (rayorigin(&tr, r, TRANS, 1.0) == 0) { |
195 |
< |
VCOPY(tr.rdir, r->rdir); |
196 |
< |
rayvalue(&tr); |
197 |
< |
copycolor(r->rcol, tr.rcol); |
198 |
< |
r->rt = r->rot + tr.rt; |
153 |
< |
} |
194 |
> |
rayorigin(&tr, TRANS, r, NULL); /* always continue */ |
195 |
> |
VCOPY(tr.rdir, r->rdir); |
196 |
> |
rayvalue(&tr); |
197 |
> |
copycolor(r->rcol, tr.rcol); |
198 |
> |
r->rt = r->rot + tr.rt; |
199 |
|
} |
200 |
|
|
201 |
|
|
202 |
< |
extern int |
202 |
> |
/* Macro for test to see if BSDF material uses proxy */ |
203 |
> |
#define isBSDFproxy(m) ((m)->otype == MAT_BSDF && (m)->oargs.nsargs && \ |
204 |
> |
strcmp((m)->oargs.sarg[0], "0")) |
205 |
> |
|
206 |
> |
|
207 |
> |
int |
208 |
|
rayshade( /* shade ray r with material mod */ |
209 |
< |
register RAY *r, |
209 |
> |
RAY *r, |
210 |
|
int mod |
211 |
|
) |
212 |
|
{ |
213 |
< |
register OBJREC *m; |
213 |
> |
OBJREC *m; |
214 |
|
|
215 |
< |
r->rt = r->rot; /* set effective ray length */ |
215 |
> |
r->rt = r->rot; /* preset effective ray length */ |
216 |
|
for ( ; mod != OVOID; mod = m->omod) { |
217 |
|
m = objptr(mod); |
218 |
|
/****** unnecessary test since modifier() is always called |
223 |
|
******/ |
224 |
|
/* hack for irradiance calculation */ |
225 |
|
if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS)) && |
226 |
+ |
(ofun[m->otype].flags & (T_M|T_X)) && |
227 |
|
m->otype != MAT_CLIP && |
228 |
< |
(ofun[m->otype].flags & (T_M|T_X))) { |
228 |
> |
!isBSDFproxy(m)) { |
229 |
|
if (irr_ignore(m->otype)) { |
230 |
|
raytrans(r); |
231 |
|
return(1); |
240 |
|
} |
241 |
|
|
242 |
|
|
243 |
< |
extern void |
243 |
> |
void |
244 |
|
rayparticipate( /* compute ray medium participation */ |
245 |
< |
register RAY *r |
245 |
> |
RAY *r |
246 |
|
) |
247 |
|
{ |
248 |
|
COLOR ce, ca; |
258 |
|
ge *= 1. - colval(r->albedo,GRN); |
259 |
|
be *= 1. - colval(r->albedo,BLU); |
260 |
|
} |
261 |
< |
setcolor(ce, re<=0. ? 1. : re>92. ? 0. : exp(-re), |
262 |
< |
ge<=0. ? 1. : ge>92. ? 0. : exp(-ge), |
263 |
< |
be<=0. ? 1. : be>92. ? 0. : exp(-be)); |
264 |
< |
multcolor(r->rcol, ce); /* path absorption */ |
261 |
> |
setcolor(ce, re<=FTINY ? 1. : re>92. ? 0. : exp(-re), |
262 |
> |
ge<=FTINY ? 1. : ge>92. ? 0. : exp(-ge), |
263 |
> |
be<=FTINY ? 1. : be>92. ? 0. : exp(-be)); |
264 |
> |
multcolor(r->rcol, ce); /* path extinction */ |
265 |
|
if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
266 |
|
return; /* no scattering */ |
267 |
< |
setcolor(ca, |
268 |
< |
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
269 |
< |
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
270 |
< |
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
271 |
< |
addcolor(r->rcol, ca); /* ambient in scattering */ |
267 |
> |
|
268 |
> |
/* PMAP: indirect inscattering accounted for by volume photons? */ |
269 |
> |
if (!volumePhotonMapping) { |
270 |
> |
setcolor(ca, |
271 |
> |
colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
272 |
> |
colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
273 |
> |
colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
274 |
> |
addcolor(r->rcol, ca); /* ambient in scattering */ |
275 |
> |
} |
276 |
> |
|
277 |
|
srcscatter(r); /* source in scattering */ |
278 |
|
} |
279 |
|
|
280 |
|
|
281 |
< |
extern void |
281 |
> |
void |
282 |
|
raytexture( /* get material modifiers */ |
283 |
|
RAY *r, |
284 |
|
OBJECT mod |
285 |
|
) |
286 |
|
{ |
287 |
< |
register OBJREC *m; |
287 |
> |
OBJREC *m; |
288 |
|
/* execute textures and patterns */ |
289 |
|
for ( ; mod != OVOID; mod = m->omod) { |
290 |
|
m = objptr(mod); |
303 |
|
} |
304 |
|
|
305 |
|
|
306 |
< |
extern int |
306 |
> |
int |
307 |
|
raymixture( /* mix modifiers */ |
308 |
< |
register RAY *r, |
308 |
> |
RAY *r, |
309 |
|
OBJECT fore, |
310 |
|
OBJECT back, |
311 |
|
double coef |
313 |
|
{ |
314 |
|
RAY fr, br; |
315 |
|
int foremat, backmat; |
316 |
< |
register int i; |
316 |
> |
int i; |
317 |
|
/* bound coefficient */ |
318 |
|
if (coef > 1.0) |
319 |
|
coef = 1.0; |
323 |
|
foremat = backmat = 0; |
324 |
|
/* foreground */ |
325 |
|
fr = *r; |
326 |
< |
if (coef > FTINY) |
326 |
> |
if (coef > FTINY) { |
327 |
> |
fr.rweight *= coef; |
328 |
> |
scalecolor(fr.rcoef, coef); |
329 |
|
foremat = rayshade(&fr, fore); |
330 |
+ |
} |
331 |
|
/* background */ |
332 |
|
br = *r; |
333 |
< |
if (coef < 1.0-FTINY) |
333 |
> |
if (coef < 1.0-FTINY) { |
334 |
> |
br.rweight *= 1.0-coef; |
335 |
> |
scalecolor(br.rcoef, 1.0-coef); |
336 |
|
backmat = rayshade(&br, back); |
337 |
+ |
} |
338 |
|
/* check for transparency */ |
339 |
|
if (backmat ^ foremat) { |
340 |
|
if (backmat && coef > FTINY) |
363 |
|
} |
364 |
|
|
365 |
|
|
366 |
< |
extern double |
366 |
> |
double |
367 |
|
raydist( /* compute (cumulative) ray distance */ |
368 |
< |
register RAY *r, |
369 |
< |
register int flags |
368 |
> |
const RAY *r, |
369 |
> |
int flags |
370 |
|
) |
371 |
|
{ |
372 |
|
double sum = 0.0; |
379 |
|
} |
380 |
|
|
381 |
|
|
382 |
< |
extern double |
382 |
> |
void |
383 |
> |
raycontrib( /* compute (cumulative) ray contribution */ |
384 |
> |
RREAL rc[3], |
385 |
> |
const RAY *r, |
386 |
> |
int flags |
387 |
> |
) |
388 |
> |
{ |
389 |
> |
double eext[3]; |
390 |
> |
int i; |
391 |
> |
|
392 |
> |
eext[0] = eext[1] = eext[2] = 0.; |
393 |
> |
rc[0] = rc[1] = rc[2] = 1.; |
394 |
> |
|
395 |
> |
while (r != NULL && r->crtype&flags) { |
396 |
> |
for (i = 3; i--; ) { |
397 |
> |
rc[i] *= colval(r->rcoef,i); |
398 |
> |
eext[i] += r->rot * colval(r->cext,i); |
399 |
> |
} |
400 |
> |
r = r->parent; |
401 |
> |
} |
402 |
> |
for (i = 3; i--; ) |
403 |
> |
rc[i] *= (eext[i] <= FTINY) ? 1. : |
404 |
> |
(eext[i] > 92.) ? 0. : exp(-eext[i]); |
405 |
> |
} |
406 |
> |
|
407 |
> |
|
408 |
> |
double |
409 |
|
raynormal( /* compute perturbed normal for ray */ |
410 |
|
FVECT norm, |
411 |
< |
register RAY *r |
411 |
> |
RAY *r |
412 |
|
) |
413 |
|
{ |
414 |
|
double newdot; |
415 |
< |
register int i; |
415 |
> |
int i; |
416 |
|
|
417 |
|
/* The perturbation is added to the surface normal to obtain |
418 |
|
* the new normal. If the new normal would affect the surface |
441 |
|
} |
442 |
|
|
443 |
|
|
444 |
< |
extern void |
444 |
> |
void |
445 |
|
newrayxf( /* get new tranformation matrix for ray */ |
446 |
|
RAY *r |
447 |
|
) |
450 |
|
struct xfn *next; |
451 |
|
FULLXF xf; |
452 |
|
} xfseed = { &xfseed }, *xflast = &xfseed; |
453 |
< |
register struct xfn *xp; |
454 |
< |
register RAY *rp; |
453 |
> |
struct xfn *xp; |
454 |
> |
const RAY *rp; |
455 |
|
|
456 |
|
/* |
457 |
|
* Search for transform in circular list that |
462 |
|
if (rp->rox == &xp->xf) { /* xp in use */ |
463 |
|
xp = xp->next; /* move to next */ |
464 |
|
if (xp == xflast) { /* need new one */ |
465 |
< |
xp = (struct xfn *)malloc(sizeof(struct xfn)); |
465 |
> |
xp = (struct xfn *)bmalloc(sizeof(struct xfn)); |
466 |
|
if (xp == NULL) |
467 |
|
error(SYSTEM, |
468 |
|
"out of memory in newrayxf"); |
479 |
|
} |
480 |
|
|
481 |
|
|
482 |
< |
extern void |
482 |
> |
void |
483 |
|
flipsurface( /* reverse surface orientation */ |
484 |
< |
register RAY *r |
484 |
> |
RAY *r |
485 |
|
) |
486 |
|
{ |
487 |
|
r->rod = -r->rod; |
494 |
|
} |
495 |
|
|
496 |
|
|
497 |
< |
extern void |
497 |
> |
void |
498 |
|
rayhit( /* standard ray hit test */ |
499 |
|
OBJECT *oset, |
500 |
|
RAY *r |
511 |
|
} |
512 |
|
|
513 |
|
|
514 |
< |
extern int |
514 |
> |
int |
515 |
|
localhit( /* check for hit in the octree */ |
516 |
< |
register RAY *r, |
517 |
< |
register CUBE *scene |
516 |
> |
RAY *r, |
517 |
> |
CUBE *scene |
518 |
|
) |
519 |
|
{ |
520 |
|
OBJECT cxset[MAXCSET+1]; /* set of checked objects */ |
521 |
|
FVECT curpos; /* current cube position */ |
522 |
|
int sflags; /* sign flags */ |
523 |
|
double t, dt; |
524 |
< |
register int i; |
524 |
> |
int i; |
525 |
|
|
526 |
|
nrays++; /* increment trace counter */ |
527 |
|
sflags = 0; |
532 |
|
else if (r->rdir[i] < -1e-7) |
533 |
|
sflags |= 0x10 << i; |
534 |
|
} |
535 |
< |
if (sflags == 0) |
536 |
< |
error(CONSISTENCY, "zero ray direction in localhit"); |
535 |
> |
if (!sflags) { |
536 |
> |
error(WARNING, "zero ray direction in localhit"); |
537 |
> |
return(0); |
538 |
> |
} |
539 |
|
/* start off assuming nothing hit */ |
540 |
|
if (r->rmax > FTINY) { /* except aft plane if one */ |
541 |
|
r->ro = &Aftplane; |
542 |
|
r->rot = r->rmax; |
543 |
< |
for (i = 0; i < 3; i++) |
454 |
< |
r->rop[i] = r->rorg[i] + r->rot*r->rdir[i]; |
543 |
> |
VSUM(r->rop, r->rorg, r->rdir, r->rot); |
544 |
|
} |
545 |
|
/* find global cube entrance point */ |
546 |
|
t = 0.0; |
563 |
|
if (t >= r->rot) /* clipped already */ |
564 |
|
return(0); |
565 |
|
/* advance position */ |
566 |
< |
for (i = 0; i < 3; i++) |
478 |
< |
curpos[i] += r->rdir[i]*t; |
566 |
> |
VSUM(curpos, curpos, r->rdir, t); |
567 |
|
|
568 |
|
if (!incube(scene, curpos)) /* non-intersecting ray */ |
569 |
|
return(0); |
579 |
|
FVECT pos, /* current position, modified herein */ |
580 |
|
OBJECT *cxs, /* checked objects, modified by checkhit */ |
581 |
|
int dirf, /* direction indicators to speed tests */ |
582 |
< |
register RAY *r, |
583 |
< |
register CUBE *cu |
582 |
> |
RAY *r, |
583 |
> |
CUBE *cu |
584 |
|
) |
585 |
|
{ |
586 |
|
int ax; |
588 |
|
|
589 |
|
if (istree(cu->cutree)) { /* recurse on subcubes */ |
590 |
|
CUBE cukid; |
591 |
< |
register int br, sgn; |
591 |
> |
int br, sgn; |
592 |
|
|
593 |
|
cukid.cusize = cu->cusize * 0.5; /* find subcube */ |
594 |
|
VCOPY(cukid.cuorg, cu->cuorg); |
654 |
|
ax = 2; |
655 |
|
} |
656 |
|
} |
657 |
< |
pos[0] += r->rdir[0]*t; |
570 |
< |
pos[1] += r->rdir[1]*t; |
571 |
< |
pos[2] += r->rdir[2]*t; |
657 |
> |
VSUM(pos, pos, r->rdir, t); |
658 |
|
return(ax); |
659 |
|
} |
660 |
|
|
661 |
|
|
662 |
|
static int |
663 |
|
checkhit( /* check for hit in full cube */ |
664 |
< |
register RAY *r, |
664 |
> |
RAY *r, |
665 |
|
CUBE *cu, |
666 |
|
OBJECT *cxs |
667 |
|
) |
682 |
|
|
683 |
|
static void |
684 |
|
checkset( /* modify checked set and set to check */ |
685 |
< |
register OBJECT *os, /* os' = os - cs */ |
686 |
< |
register OBJECT *cs /* cs' = cs + os */ |
685 |
> |
OBJECT *os, /* os' = os - cs */ |
686 |
> |
OBJECT *cs /* cs' = cs + os */ |
687 |
|
) |
688 |
|
{ |
689 |
|
OBJECT cset[MAXCSET+MAXSET+1]; |
690 |
< |
register int i, j; |
690 |
> |
int i, j; |
691 |
|
int k; |
692 |
|
/* copy os in place, cset <- cs */ |
693 |
|
cset[0] = 0; |