10 |
|
#include "mkillum.h" |
11 |
|
#include "face.h" |
12 |
|
#include "cone.h" |
13 |
< |
#include "random.h" |
13 |
> |
#include "source.h" |
14 |
> |
#include "paths.h" |
15 |
|
|
16 |
+ |
#ifndef NBSDFSAMPS |
17 |
+ |
#define NBSDFSAMPS 256 /* BSDF resampling count */ |
18 |
+ |
#endif |
19 |
|
|
20 |
|
COLORV * distarr = NULL; /* distribution array */ |
21 |
|
int distsiz = 0; |
28 |
|
{ |
29 |
|
if (siz <= 0) { |
30 |
|
if (distsiz > 0) |
31 |
< |
free((void *)distarr); |
31 |
> |
free(distarr); |
32 |
|
distarr = NULL; |
33 |
|
distsiz = 0; |
34 |
|
return; |
35 |
|
} |
36 |
|
if (distsiz < siz) { |
37 |
|
if (distsiz > 0) |
38 |
< |
free((void *)distarr); |
38 |
> |
free(distarr); |
39 |
|
distarr = (COLORV *)malloc(sizeof(COLOR)*siz); |
40 |
|
if (distarr == NULL) |
41 |
|
error(SYSTEM, "out of memory in newdist"); |
46 |
|
|
47 |
|
|
48 |
|
int |
49 |
< |
process_ray(RAY *r, int rv) |
49 |
> |
process_ray( /* process a ray result or report error */ |
50 |
> |
RAY *r, |
51 |
> |
int rv |
52 |
> |
) |
53 |
|
{ |
54 |
|
COLORV *colp; |
55 |
|
|
59 |
|
error(USER, "ray tracing process died"); |
60 |
|
if (r->rno >= distsiz) |
61 |
|
error(INTERNAL, "bad returned index in process_ray"); |
62 |
+ |
multcolor(r->rcol, r->rcoef); /* in case it's a source ray */ |
63 |
|
colp = &distarr[r->rno * 3]; |
64 |
|
addcolor(colp, r->rcol); |
65 |
|
return(1); |
67 |
|
|
68 |
|
|
69 |
|
void |
70 |
< |
raysamp( /* queue a ray sample */ |
70 |
> |
raysamp( /* queue a ray sample */ |
71 |
|
int ndx, |
72 |
|
FVECT org, |
73 |
|
FVECT dir |
81 |
|
VCOPY(myRay.rorg, org); |
82 |
|
VCOPY(myRay.rdir, dir); |
83 |
|
myRay.rmax = .0; |
84 |
< |
rayorigin(&myRay, PRIMARY, NULL, NULL); |
84 |
> |
rayorigin(&myRay, PRIMARY|SPECULAR, NULL, NULL); |
85 |
|
myRay.rno = ndx; |
86 |
|
/* queue ray, check result */ |
87 |
|
process_ray(&myRay, ray_pqueue(&myRay)); |
89 |
|
|
90 |
|
|
91 |
|
void |
92 |
+ |
srcsamps( /* sample sources from this surface position */ |
93 |
+ |
struct illum_args *il, |
94 |
+ |
FVECT org, |
95 |
+ |
FVECT nrm, |
96 |
+ |
MAT4 ixfm |
97 |
+ |
) |
98 |
+ |
{ |
99 |
+ |
int nalt=1, nazi=1; |
100 |
+ |
SRCINDEX si; |
101 |
+ |
RAY sr; |
102 |
+ |
FVECT v; |
103 |
+ |
double d; |
104 |
+ |
int i, j; |
105 |
+ |
/* get sampling density */ |
106 |
+ |
if (il->sampdens > 0) { |
107 |
+ |
i = PI * il->sampdens; |
108 |
+ |
nalt = sqrt(i/PI) + .5; |
109 |
+ |
nazi = PI*nalt + .5; |
110 |
+ |
} |
111 |
+ |
initsrcindex(&si); /* loop over (sub)sources */ |
112 |
+ |
for ( ; ; ) { |
113 |
+ |
VCOPY(sr.rorg, org); /* pick side to shoot from */ |
114 |
+ |
d = 5.*FTINY; |
115 |
+ |
VSUM(sr.rorg, sr.rorg, nrm, d); |
116 |
+ |
samplendx++; /* increment sample counter */ |
117 |
+ |
if (!srcray(&sr, NULL, &si)) |
118 |
+ |
break; /* end of sources */ |
119 |
+ |
/* index direction */ |
120 |
+ |
if (ixfm != NULL) |
121 |
+ |
multv3(v, sr.rdir, ixfm); |
122 |
+ |
else |
123 |
+ |
VCOPY(v, sr.rdir); |
124 |
+ |
if (v[2] >= -FTINY) |
125 |
+ |
continue; /* only sample transmission */ |
126 |
+ |
v[0] = -v[0]; v[1] = -v[1]; v[2] = -v[2]; |
127 |
+ |
sr.rno = flatindex(v, nalt, nazi); |
128 |
+ |
d = nalt*nazi*(1./PI) * v[2]; |
129 |
+ |
d *= si.dom; /* solid angle correction */ |
130 |
+ |
scalecolor(sr.rcoef, d); |
131 |
+ |
process_ray(&sr, ray_pqueue(&sr)); |
132 |
+ |
} |
133 |
+ |
} |
134 |
+ |
|
135 |
+ |
|
136 |
+ |
void |
137 |
|
rayclean() /* finish all pending rays */ |
138 |
|
{ |
139 |
|
RAY myRay; |
150 |
|
FVECT n |
151 |
|
) |
152 |
|
{ |
153 |
< |
register int i; |
101 |
< |
|
102 |
< |
v[0] = v[1] = v[2] = 0.0; |
103 |
< |
for (i = 0; i < 3; i++) |
104 |
< |
if (n[i] < 0.6 && n[i] > -0.6) |
105 |
< |
break; |
106 |
< |
v[i] = 1.0; |
107 |
< |
fcross(u, v, n); |
108 |
< |
normalize(u); |
153 |
> |
getperpendicular(u, n); |
154 |
|
fcross(v, n, u); |
155 |
|
} |
156 |
|
|
157 |
|
|
158 |
|
static void |
159 |
|
rounddir( /* compute uniform spherical direction */ |
160 |
< |
register FVECT dv, |
160 |
> |
FVECT dv, |
161 |
|
double alt, |
162 |
|
double azi |
163 |
|
) |
190 |
|
|
191 |
|
|
192 |
|
int |
193 |
+ |
flatindex( /* compute index for hemispherical direction */ |
194 |
+ |
FVECT dv, |
195 |
+ |
int nalt, |
196 |
+ |
int nazi |
197 |
+ |
) |
198 |
+ |
{ |
199 |
+ |
double d; |
200 |
+ |
int i, j; |
201 |
+ |
|
202 |
+ |
d = 1.0 - dv[2]*dv[2]; |
203 |
+ |
i = d*nalt; |
204 |
+ |
d = atan2(dv[1], dv[0]) * (0.5/PI); |
205 |
+ |
if (d < 0.0) d += 1.0; |
206 |
+ |
j = d*nazi + 0.5; |
207 |
+ |
if (j >= nazi) j = 0; |
208 |
+ |
return(i*nazi + j); |
209 |
+ |
} |
210 |
+ |
|
211 |
+ |
|
212 |
+ |
int |
213 |
|
my_default( /* default illum action */ |
214 |
|
OBJREC *ob, |
215 |
|
struct illum_args *il, |
231 |
|
char *nm |
232 |
|
) |
233 |
|
{ |
169 |
– |
#define MAXMISS (5*n*il->nsamps) |
234 |
|
int dim[2]; |
235 |
< |
int n, nalt, nazi, h, alti; |
235 |
> |
int n, nalt, nazi, alti; |
236 |
|
double sp[2], r1, r2; |
237 |
+ |
int h; |
238 |
|
FVECT dn, org, dir; |
239 |
|
FVECT u, v; |
240 |
|
double ur[2], vr[2]; |
241 |
|
MAT4 xfm; |
242 |
< |
int nmisses; |
242 |
> |
char xfrot[64]; |
243 |
> |
int nallow; |
244 |
|
FACE *fa; |
245 |
< |
register int i, j; |
245 |
> |
int i, j; |
246 |
|
/* get/check arguments */ |
247 |
|
fa = getface(ob); |
248 |
|
if (fa->area == 0.0) { |
250 |
|
return(my_default(ob, il, nm)); |
251 |
|
} |
252 |
|
/* set up sampling */ |
253 |
< |
if (il->sd != NULL) { |
254 |
< |
if (!getBSDF_xfm(xfm, fa->norm, il->udir)) { |
189 |
< |
objerror(ob, WARNING, "illegal up direction"); |
190 |
< |
freeface(ob); |
191 |
< |
return(my_default(ob, il, nm)); |
192 |
< |
} |
193 |
< |
n = il->sd->ninc; |
253 |
> |
if (il->sampdens <= 0) { |
254 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
255 |
|
} else { |
256 |
< |
if (il->sampdens <= 0) { |
257 |
< |
nalt = nazi = 1; /* diffuse assumption */ |
258 |
< |
} else { |
198 |
< |
n = PI * il->sampdens; |
199 |
< |
nalt = sqrt(n/PI) + .5; |
200 |
< |
nazi = PI*nalt + .5; |
201 |
< |
} |
202 |
< |
n = nazi*nalt; |
256 |
> |
n = PI * il->sampdens; |
257 |
> |
nalt = sqrt(n/PI) + .5; |
258 |
> |
nazi = PI*nalt + .5; |
259 |
|
} |
260 |
+ |
n = nazi*nalt; |
261 |
|
newdist(n); |
262 |
|
/* take first edge >= sqrt(area) */ |
263 |
|
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
286 |
|
} |
287 |
|
dim[0] = random(); |
288 |
|
/* sample polygon */ |
289 |
< |
nmisses = 0; |
289 |
> |
nallow = 5*n*il->nsamps; |
290 |
|
for (dim[1] = 0; dim[1] < n; dim[1]++) |
291 |
|
for (i = 0; i < il->nsamps; i++) { |
292 |
|
/* randomize direction */ |
293 |
|
h = ilhash(dim, 2) + i; |
294 |
< |
if (il->sd != NULL) { |
295 |
< |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
296 |
< |
} else { |
297 |
< |
multisamp(sp, 2, urand(h)); |
298 |
< |
alti = dim[1]/nazi; |
299 |
< |
r1 = (alti + sp[0])/nalt; |
243 |
< |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
244 |
< |
flatdir(dn, r1, r2); |
245 |
< |
for (j = 0; j < 3; j++) |
294 |
> |
multisamp(sp, 2, urand(h)); |
295 |
> |
alti = dim[1]/nazi; |
296 |
> |
r1 = (alti + sp[0])/nalt; |
297 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
298 |
> |
flatdir(dn, r1, r2); |
299 |
> |
for (j = 0; j < 3; j++) |
300 |
|
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - |
301 |
|
dn[2]*fa->norm[j]; |
248 |
– |
} |
302 |
|
/* randomize location */ |
303 |
|
do { |
304 |
< |
multisamp(sp, 2, urand(h+4862+nmisses)); |
304 |
> |
multisamp(sp, 2, urand(h+4862+nallow)); |
305 |
|
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
306 |
|
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
307 |
|
for (j = 0; j < 3; j++) |
308 |
|
org[j] = r1*u[j] + r2*v[j] |
309 |
|
+ fa->offset*fa->norm[j]; |
310 |
< |
} while (!inface(org, fa) && nmisses++ < MAXMISS); |
311 |
< |
if (nmisses > MAXMISS) { |
310 |
> |
} while (!inface(org, fa) && nallow-- > 0); |
311 |
> |
if (nallow < 0) { |
312 |
|
objerror(ob, WARNING, "bad aspect"); |
313 |
|
rayclean(); |
314 |
|
freeface(ob); |
315 |
|
return(my_default(ob, il, nm)); |
316 |
|
} |
317 |
< |
if (il->sd != NULL && DOT(dir, fa->norm) < -FTINY) |
265 |
< |
r1 = -1.0001*il->thick - .0001; |
266 |
< |
else |
267 |
< |
r1 = .0001; |
317 |
> |
r1 = 5.*FTINY; |
318 |
|
for (j = 0; j < 3; j++) |
319 |
|
org[j] += r1*fa->norm[j]; |
320 |
|
/* send sample */ |
321 |
|
raysamp(dim[1], org, dir); |
322 |
|
} |
323 |
< |
rayclean(); |
324 |
< |
if (il->sd != NULL) { /* run distribution through BSDF */ |
325 |
< |
nalt = sqrt(il->sd->nout/PI) + .5; |
326 |
< |
nazi = PI*nalt + .5; |
327 |
< |
redistribute(il->sd, nalt, nazi, u, v, fa->norm, xfm); |
323 |
> |
/* add in direct component? */ |
324 |
> |
if (il->flags & IL_LIGHT) { |
325 |
> |
MAT4 ixfm; |
326 |
> |
for (i = 3; i--; ) { |
327 |
> |
ixfm[i][0] = u[i]; |
328 |
> |
ixfm[i][1] = v[i]; |
329 |
> |
ixfm[i][2] = fa->norm[i]; |
330 |
> |
ixfm[i][3] = 0.; |
331 |
> |
} |
332 |
> |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
333 |
> |
ixfm[3][3] = 1.; |
334 |
> |
dim[0] = random(); |
335 |
> |
nallow = 10*il->nsamps; |
336 |
> |
for (i = 0; i < il->nsamps; i++) { |
337 |
> |
/* randomize location */ |
338 |
> |
h = dim[0] + samplendx++; |
339 |
> |
do { |
340 |
> |
multisamp(sp, 2, urand(h+nallow)); |
341 |
> |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
342 |
> |
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
343 |
> |
for (j = 0; j < 3; j++) |
344 |
> |
org[j] = r1*u[j] + r2*v[j] |
345 |
> |
+ fa->offset*fa->norm[j]; |
346 |
> |
} while (!inface(org, fa) && nallow-- > 0); |
347 |
> |
if (nallow < 0) { |
348 |
> |
objerror(ob, WARNING, "bad aspect"); |
349 |
> |
rayclean(); |
350 |
> |
freeface(ob); |
351 |
> |
return(my_default(ob, il, nm)); |
352 |
> |
} |
353 |
> |
/* sample source rays */ |
354 |
> |
srcsamps(il, org, fa->norm, ixfm); |
355 |
> |
} |
356 |
|
} |
357 |
+ |
/* wait for all rays to finish */ |
358 |
+ |
rayclean(); |
359 |
|
/* write out the face and its distribution */ |
360 |
|
if (average(il, distarr, n)) { |
361 |
|
if (il->sampdens > 0) |
366 |
|
/* clean up */ |
367 |
|
freeface(ob); |
368 |
|
return(0); |
289 |
– |
#undef MAXMISS |
369 |
|
} |
370 |
|
|
371 |
|
|
372 |
|
int |
373 |
|
my_sphere( /* make an illum sphere */ |
374 |
< |
register OBJREC *ob, |
374 |
> |
OBJREC *ob, |
375 |
|
struct illum_args *il, |
376 |
|
char *nm |
377 |
|
) |
381 |
|
double sp[4], r1, r2, r3; |
382 |
|
FVECT org, dir; |
383 |
|
FVECT u, v; |
384 |
< |
register int i, j; |
384 |
> |
int i, j; |
385 |
|
/* check arguments */ |
386 |
|
if (ob->oargs.nfargs != 4) |
387 |
|
objerror(ob, USER, "bad # of arguments"); |
393 |
|
nalt = sqrt(2./PI*n) + .5; |
394 |
|
nazi = PI/2.*nalt + .5; |
395 |
|
} |
317 |
– |
if (il->sd != NULL) |
318 |
– |
objerror(ob, WARNING, "BSDF ignored"); |
396 |
|
n = nalt*nazi; |
397 |
|
newdist(n); |
398 |
|
dim[0] = random(); |
421 |
|
/* send sample */ |
422 |
|
raysamp(dim[1]*nazi+dim[2], org, dir); |
423 |
|
} |
424 |
+ |
/* wait for all rays to finish */ |
425 |
|
rayclean(); |
426 |
|
/* write out the sphere and its distribution */ |
427 |
|
if (average(il, distarr, n)) { |
452 |
|
FVECT u, v; |
453 |
|
MAT4 xfm; |
454 |
|
CONE *co; |
455 |
< |
register int i, j; |
455 |
> |
int i, j; |
456 |
|
/* get/check arguments */ |
457 |
|
co = getcone(ob, 0); |
458 |
|
/* set up sampling */ |
459 |
< |
if (il->sd != NULL) { |
460 |
< |
if (!getBSDF_xfm(xfm, co->ad, il->udir)) { |
383 |
< |
objerror(ob, WARNING, "illegal up direction"); |
384 |
< |
freecone(ob); |
385 |
< |
return(my_default(ob, il, nm)); |
386 |
< |
} |
387 |
< |
n = il->sd->ninc; |
459 |
> |
if (il->sampdens <= 0) { |
460 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
461 |
|
} else { |
462 |
< |
if (il->sampdens <= 0) { |
463 |
< |
nalt = nazi = 1; /* diffuse assumption */ |
464 |
< |
} else { |
392 |
< |
n = PI * il->sampdens; |
393 |
< |
nalt = sqrt(n/PI) + .5; |
394 |
< |
nazi = PI*nalt + .5; |
395 |
< |
} |
396 |
< |
n = nazi*nalt; |
462 |
> |
n = PI * il->sampdens; |
463 |
> |
nalt = sqrt(n/PI) + .5; |
464 |
> |
nazi = PI*nalt + .5; |
465 |
|
} |
466 |
+ |
n = nazi*nalt; |
467 |
|
newdist(n); |
468 |
|
mkaxes(u, v, co->ad); |
469 |
|
dim[0] = random(); |
473 |
|
/* next sample point */ |
474 |
|
h = ilhash(dim,2) + i; |
475 |
|
/* randomize direction */ |
476 |
< |
if (il->sd != NULL) { |
477 |
< |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
478 |
< |
} else { |
479 |
< |
multisamp(sp, 2, urand(h)); |
480 |
< |
alti = dim[1]/nazi; |
481 |
< |
r1 = (alti + sp[0])/nalt; |
482 |
< |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
414 |
< |
flatdir(dn, r1, r2); |
415 |
< |
for (j = 0; j < 3; j++) |
416 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
417 |
< |
} |
476 |
> |
multisamp(sp, 2, urand(h)); |
477 |
> |
alti = dim[1]/nazi; |
478 |
> |
r1 = (alti + sp[0])/nalt; |
479 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
480 |
> |
flatdir(dn, r1, r2); |
481 |
> |
for (j = 0; j < 3; j++) |
482 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
483 |
|
/* randomize location */ |
484 |
|
multisamp(sp, 2, urand(h+8371)); |
485 |
|
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
487 |
|
r2 = 2.*PI*sp[1]; |
488 |
|
r1 = r3*cos(r2); |
489 |
|
r2 = r3*sin(r2); |
490 |
< |
if (il->sd != NULL && DOT(dir, co->ad) < -FTINY) |
426 |
< |
r3 = -1.0001*il->thick - .0001; |
427 |
< |
else |
428 |
< |
r3 = .0001; |
490 |
> |
r3 = 5.*FTINY; |
491 |
|
for (j = 0; j < 3; j++) |
492 |
|
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
493 |
|
r3*co->ad[j]; |
494 |
|
/* send sample */ |
495 |
|
raysamp(dim[1], org, dir); |
496 |
|
} |
497 |
< |
rayclean(); |
498 |
< |
if (il->sd != NULL) { /* run distribution through BSDF */ |
499 |
< |
nalt = sqrt(il->sd->nout/PI) + .5; |
500 |
< |
nazi = PI*nalt + .5; |
501 |
< |
redistribute(il->sd, nalt, nazi, u, v, co->ad, xfm); |
497 |
> |
/* add in direct component? */ |
498 |
> |
if (il->flags & IL_LIGHT) { |
499 |
> |
MAT4 ixfm; |
500 |
> |
for (i = 3; i--; ) { |
501 |
> |
ixfm[i][0] = u[i]; |
502 |
> |
ixfm[i][1] = v[i]; |
503 |
> |
ixfm[i][2] = co->ad[i]; |
504 |
> |
ixfm[i][3] = 0.; |
505 |
> |
} |
506 |
> |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
507 |
> |
ixfm[3][3] = 1.; |
508 |
> |
dim[0] = random(); |
509 |
> |
for (i = 0; i < il->nsamps; i++) { |
510 |
> |
/* randomize location */ |
511 |
> |
h = dim[0] + samplendx++; |
512 |
> |
multisamp(sp, 2, urand(h)); |
513 |
> |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
514 |
> |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
515 |
> |
r2 = 2.*PI*sp[1]; |
516 |
> |
r1 = r3*cos(r2); |
517 |
> |
r2 = r3*sin(r2); |
518 |
> |
for (j = 0; j < 3; j++) |
519 |
> |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j]; |
520 |
> |
/* sample source rays */ |
521 |
> |
srcsamps(il, org, co->ad, ixfm); |
522 |
> |
} |
523 |
|
} |
524 |
+ |
/* wait for all rays to finish */ |
525 |
+ |
rayclean(); |
526 |
|
/* write out the ring and its distribution */ |
527 |
|
if (average(il, distarr, n)) { |
528 |
|
if (il->sampdens > 0) |