10 |
|
#include "mkillum.h" |
11 |
|
#include "face.h" |
12 |
|
#include "cone.h" |
13 |
< |
#include "random.h" |
13 |
> |
#include "source.h" |
14 |
|
|
15 |
|
|
16 |
< |
static void mkaxes(FVECT u, FVECT v, FVECT n); |
17 |
< |
static void rounddir(FVECT dv, double alt, double azi); |
18 |
< |
static void flatdir(FVECT dv, double alt, double azi); |
16 |
> |
COLORV * distarr = NULL; /* distribution array */ |
17 |
> |
int distsiz = 0; |
18 |
> |
COLORV * direct_discount = NULL; /* amount to take off direct */ |
19 |
|
|
20 |
< |
|
21 |
< |
static COLORV * distarr = NULL; /* distribution array */ |
22 |
< |
static int distsiz = 0; |
23 |
< |
|
24 |
< |
|
25 |
< |
static void |
20 |
> |
void |
21 |
|
newdist( /* allocate & clear distribution array */ |
22 |
|
int siz |
23 |
|
) |
24 |
|
{ |
25 |
< |
if (siz == 0) { |
25 |
> |
if (siz <= 0) { |
26 |
|
if (distsiz > 0) |
27 |
|
free((void *)distarr); |
28 |
|
distarr = NULL; |
30 |
|
return; |
31 |
|
} |
32 |
|
if (distsiz < siz) { |
33 |
< |
free((void *)distarr); |
34 |
< |
distarr = (COLORV *)malloc(sizeof(COLORV)*3*siz); |
33 |
> |
if (distsiz > 0) |
34 |
> |
free((void *)distarr); |
35 |
> |
distarr = (COLORV *)malloc(sizeof(COLOR)*siz); |
36 |
|
if (distarr == NULL) |
37 |
|
error(SYSTEM, "out of memory in newdist"); |
38 |
|
distsiz = siz; |
39 |
|
} |
40 |
< |
memset(distarr, '\0', sizeof(COLORV)*3*siz); |
40 |
> |
memset(distarr, '\0', sizeof(COLOR)*siz); |
41 |
|
} |
42 |
|
|
43 |
|
|
44 |
< |
static int |
45 |
< |
process_ray(RAY *r, int rv) |
44 |
> |
static void |
45 |
> |
new_discount() /* allocate space for direct contrib. record */ |
46 |
|
{ |
47 |
+ |
if (distsiz <= 0) |
48 |
+ |
return; |
49 |
+ |
direct_discount = (COLORV *)calloc(distsiz, sizeof(COLOR)); |
50 |
+ |
if (direct_discount == NULL) |
51 |
+ |
error(SYSTEM, "out of memory in new_discount"); |
52 |
+ |
} |
53 |
+ |
|
54 |
+ |
|
55 |
+ |
static void |
56 |
+ |
done_discount() /* clear off direct contrib. record */ |
57 |
+ |
{ |
58 |
+ |
if (direct_discount == NULL) |
59 |
+ |
return; |
60 |
+ |
free((void *)direct_discount); |
61 |
+ |
direct_discount = NULL; |
62 |
+ |
} |
63 |
+ |
|
64 |
+ |
|
65 |
+ |
int |
66 |
+ |
process_ray( /* process a ray result or report error */ |
67 |
+ |
RAY *r, |
68 |
+ |
int rv |
69 |
+ |
) |
70 |
+ |
{ |
71 |
|
COLORV *colp; |
72 |
|
|
73 |
< |
if (rv == 0) |
73 |
> |
if (rv == 0) /* no result ready */ |
74 |
|
return(0); |
75 |
|
if (rv < 0) |
76 |
|
error(USER, "ray tracing process died"); |
77 |
|
if (r->rno >= distsiz) |
78 |
|
error(INTERNAL, "bad returned index in process_ray"); |
79 |
+ |
multcolor(r->rcol, r->rcoef); /* in case it's a source ray */ |
80 |
|
colp = &distarr[r->rno * 3]; |
81 |
|
addcolor(colp, r->rcol); |
82 |
+ |
if (r->rsrc >= 0 && /* remember source contrib. */ |
83 |
+ |
direct_discount != NULL) { |
84 |
+ |
colp = &direct_discount[r->rno * 3]; |
85 |
+ |
addcolor(colp, r->rcol); |
86 |
+ |
} |
87 |
|
return(1); |
88 |
|
} |
89 |
|
|
90 |
|
|
91 |
< |
static void |
92 |
< |
raysamp( /* queue a ray sample */ |
91 |
> |
void |
92 |
> |
raysamp( /* queue a ray sample */ |
93 |
|
int ndx, |
94 |
|
FVECT org, |
95 |
|
FVECT dir |
110 |
|
} |
111 |
|
|
112 |
|
|
113 |
< |
static void |
113 |
> |
void |
114 |
> |
srcsamps( /* sample sources from this surface position */ |
115 |
> |
struct illum_args *il, |
116 |
> |
FVECT org, |
117 |
> |
FVECT nrm, |
118 |
> |
MAT4 ixfm |
119 |
> |
) |
120 |
> |
{ |
121 |
> |
int nalt, nazi; |
122 |
> |
SRCINDEX si; |
123 |
> |
RAY sr; |
124 |
> |
FVECT v; |
125 |
> |
double d; |
126 |
> |
int i, j; |
127 |
> |
/* get sampling density */ |
128 |
> |
if (il->sampdens <= 0) { |
129 |
> |
nalt = nazi = 1; |
130 |
> |
} else { |
131 |
> |
i = PI * il->sampdens; |
132 |
> |
nalt = sqrt(i/PI) + .5; |
133 |
> |
nazi = PI*nalt + .5; |
134 |
> |
} |
135 |
> |
initsrcindex(&si); /* loop over (sub)sources */ |
136 |
> |
for ( ; ; ) { |
137 |
> |
VCOPY(sr.rorg, org); /* pick side to shoot from */ |
138 |
> |
if (il->sd != NULL) { |
139 |
> |
int sn = si.sn; |
140 |
> |
if (si.sp+1 >= si.np) ++sn; |
141 |
> |
if (sn >= nsources) break; |
142 |
> |
if (source[sn].sflags & SDISTANT) |
143 |
> |
d = DOT(source[sn].sloc, nrm); |
144 |
> |
else { |
145 |
> |
VSUB(v, source[sn].sloc, org); |
146 |
> |
d = DOT(v, nrm); |
147 |
> |
} |
148 |
> |
} else |
149 |
> |
d = 1.0; /* only transmission */ |
150 |
> |
if (d < 0.0) |
151 |
> |
d = -1.0001*il->thick - 5.*FTINY; |
152 |
> |
else |
153 |
> |
d = 5.*FTINY; |
154 |
> |
for (i = 3; i--; ) |
155 |
> |
sr.rorg[i] += d*nrm[i]; |
156 |
> |
samplendx++; /* increment sample counter */ |
157 |
> |
if (!srcray(&sr, NULL, &si)) |
158 |
> |
break; /* end of sources */ |
159 |
> |
/* index direction */ |
160 |
> |
if (ixfm != NULL) |
161 |
> |
multv3(v, sr.rdir, ixfm); |
162 |
> |
else |
163 |
> |
VCOPY(v, sr.rdir); |
164 |
> |
if (il->sd != NULL) { |
165 |
> |
i = getBSDF_incndx(il->sd, v); |
166 |
> |
if (i < 0) |
167 |
> |
continue; /* must not be important */ |
168 |
> |
sr.rno = i; |
169 |
> |
d = 1.0/getBSDF_incohm(il->sd, i); |
170 |
> |
} else { |
171 |
> |
if (v[2] >= -FTINY) |
172 |
> |
continue; /* only sample transmission */ |
173 |
> |
v[0] = -v[0]; v[1] = -v[1]; v[2] = -v[2]; |
174 |
> |
sr.rno = flatindex(v, nalt, nazi); |
175 |
> |
d = nalt*nazi*(1./PI) * v[2]; |
176 |
> |
} |
177 |
> |
d *= si.dom; /* solid angle correction */ |
178 |
> |
scalecolor(sr.rcoef, d); |
179 |
> |
process_ray(&sr, ray_pqueue(&sr)); |
180 |
> |
} |
181 |
> |
} |
182 |
> |
|
183 |
> |
|
184 |
> |
void |
185 |
|
rayclean() /* finish all pending rays */ |
186 |
|
{ |
187 |
|
RAY myRay; |
191 |
|
} |
192 |
|
|
193 |
|
|
194 |
+ |
static void |
195 |
+ |
mkaxes( /* compute u and v to go with n */ |
196 |
+ |
FVECT u, |
197 |
+ |
FVECT v, |
198 |
+ |
FVECT n |
199 |
+ |
) |
200 |
+ |
{ |
201 |
+ |
register int i; |
202 |
+ |
|
203 |
+ |
v[0] = v[1] = v[2] = 0.0; |
204 |
+ |
for (i = 0; i < 3; i++) |
205 |
+ |
if (n[i] < 0.6 && n[i] > -0.6) |
206 |
+ |
break; |
207 |
+ |
v[i] = 1.0; |
208 |
+ |
fcross(u, v, n); |
209 |
+ |
normalize(u); |
210 |
+ |
fcross(v, n, u); |
211 |
+ |
} |
212 |
+ |
|
213 |
+ |
|
214 |
+ |
static void |
215 |
+ |
rounddir( /* compute uniform spherical direction */ |
216 |
+ |
register FVECT dv, |
217 |
+ |
double alt, |
218 |
+ |
double azi |
219 |
+ |
) |
220 |
+ |
{ |
221 |
+ |
double d1, d2; |
222 |
+ |
|
223 |
+ |
dv[2] = 1. - 2.*alt; |
224 |
+ |
d1 = sqrt(1. - dv[2]*dv[2]); |
225 |
+ |
d2 = 2.*PI * azi; |
226 |
+ |
dv[0] = d1*cos(d2); |
227 |
+ |
dv[1] = d1*sin(d2); |
228 |
+ |
} |
229 |
+ |
|
230 |
+ |
|
231 |
+ |
void |
232 |
+ |
flatdir( /* compute uniform hemispherical direction */ |
233 |
+ |
FVECT dv, |
234 |
+ |
double alt, |
235 |
+ |
double azi |
236 |
+ |
) |
237 |
+ |
{ |
238 |
+ |
double d1, d2; |
239 |
+ |
|
240 |
+ |
d1 = sqrt(alt); |
241 |
+ |
d2 = 2.*PI * azi; |
242 |
+ |
dv[0] = d1*cos(d2); |
243 |
+ |
dv[1] = d1*sin(d2); |
244 |
+ |
dv[2] = sqrt(1. - alt); |
245 |
+ |
} |
246 |
+ |
|
247 |
|
int |
248 |
+ |
flatindex( /* compute index for hemispherical direction */ |
249 |
+ |
FVECT dv, |
250 |
+ |
int nalt, |
251 |
+ |
int nazi |
252 |
+ |
) |
253 |
+ |
{ |
254 |
+ |
double d; |
255 |
+ |
int i, j; |
256 |
+ |
|
257 |
+ |
d = 1.0 - dv[2]*dv[2]; |
258 |
+ |
i = d*nalt; |
259 |
+ |
d = atan2(dv[1], dv[0]) * (0.5/PI); |
260 |
+ |
if (d < 0.0) d += 1.0; |
261 |
+ |
j = d*nazi + 0.5; |
262 |
+ |
if (j >= nazi) j = 0; |
263 |
+ |
return(i*nazi + j); |
264 |
+ |
} |
265 |
+ |
|
266 |
+ |
|
267 |
+ |
int |
268 |
|
my_default( /* default illum action */ |
269 |
|
OBJREC *ob, |
270 |
|
struct illum_args *il, |
286 |
|
char *nm |
287 |
|
) |
288 |
|
{ |
289 |
< |
#define MAXMISS (5*n*il->nsamps) |
290 |
< |
int dim[3]; |
121 |
< |
int n, nalt, nazi, h; |
289 |
> |
int dim[2]; |
290 |
> |
int n, nalt, nazi, alti; |
291 |
|
double sp[2], r1, r2; |
292 |
+ |
int h; |
293 |
|
FVECT dn, org, dir; |
294 |
|
FVECT u, v; |
295 |
|
double ur[2], vr[2]; |
296 |
< |
int nmisses; |
297 |
< |
register FACE *fa; |
298 |
< |
register int i, j; |
296 |
> |
MAT4 xfm; |
297 |
> |
int nallow; |
298 |
> |
FACE *fa; |
299 |
> |
int i, j; |
300 |
|
/* get/check arguments */ |
301 |
|
fa = getface(ob); |
302 |
|
if (fa->area == 0.0) { |
304 |
|
return(my_default(ob, il, nm)); |
305 |
|
} |
306 |
|
/* set up sampling */ |
307 |
< |
if (il->sampdens <= 0) |
308 |
< |
nalt = nazi = 1; |
309 |
< |
else { |
310 |
< |
n = PI * il->sampdens; |
311 |
< |
nalt = sqrt(n/PI) + .5; |
312 |
< |
nazi = PI*nalt + .5; |
307 |
> |
if (il->sd != NULL) { |
308 |
> |
if (!getBSDF_xfm(xfm, fa->norm, il->udir)) { |
309 |
> |
objerror(ob, WARNING, "illegal up direction"); |
310 |
> |
freeface(ob); |
311 |
> |
return(my_default(ob, il, nm)); |
312 |
> |
} |
313 |
> |
n = il->sd->ninc; |
314 |
> |
} else { |
315 |
> |
if (il->sampdens <= 0) { |
316 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
317 |
> |
} else { |
318 |
> |
n = PI * il->sampdens; |
319 |
> |
nalt = sqrt(n/PI) + .5; |
320 |
> |
nazi = PI*nalt + .5; |
321 |
> |
} |
322 |
> |
n = nazi*nalt; |
323 |
|
} |
143 |
– |
n = nalt*nazi; |
324 |
|
newdist(n); |
325 |
|
/* take first edge >= sqrt(area) */ |
326 |
|
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
349 |
|
} |
350 |
|
dim[0] = random(); |
351 |
|
/* sample polygon */ |
352 |
< |
nmisses = 0; |
353 |
< |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
174 |
< |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
352 |
> |
nallow = 5*n*il->nsamps; |
353 |
> |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
354 |
|
for (i = 0; i < il->nsamps; i++) { |
355 |
< |
/* random direction */ |
356 |
< |
h = ilhash(dim, 3) + i; |
357 |
< |
multisamp(sp, 2, urand(h)); |
358 |
< |
r1 = (dim[1] + sp[0])/nalt; |
359 |
< |
r2 = (dim[2] + sp[1] - .5)/nazi; |
360 |
< |
flatdir(dn, r1, r2); |
361 |
< |
for (j = 0; j < 3; j++) |
362 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
363 |
< |
/* random location */ |
355 |
> |
/* randomize direction */ |
356 |
> |
h = ilhash(dim, 2) + i; |
357 |
> |
if (il->sd != NULL) { |
358 |
> |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
359 |
> |
} else { |
360 |
> |
multisamp(sp, 2, urand(h)); |
361 |
> |
alti = dim[1]/nazi; |
362 |
> |
r1 = (alti + sp[0])/nalt; |
363 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
364 |
> |
flatdir(dn, r1, r2); |
365 |
> |
for (j = 0; j < 3; j++) |
366 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - |
367 |
> |
dn[2]*fa->norm[j]; |
368 |
> |
} |
369 |
> |
/* randomize location */ |
370 |
|
do { |
371 |
< |
multisamp(sp, 2, urand(h+4862+nmisses)); |
371 |
> |
multisamp(sp, 2, urand(h+4862+nallow)); |
372 |
|
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
373 |
|
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
374 |
|
for (j = 0; j < 3; j++) |
375 |
|
org[j] = r1*u[j] + r2*v[j] |
376 |
|
+ fa->offset*fa->norm[j]; |
377 |
< |
} while (!inface(org, fa) && nmisses++ < MAXMISS); |
378 |
< |
if (nmisses > MAXMISS) { |
377 |
> |
} while (!inface(org, fa) && nallow-- > 0); |
378 |
> |
if (nallow < 0) { |
379 |
|
objerror(ob, WARNING, "bad aspect"); |
380 |
|
rayclean(); |
381 |
|
freeface(ob); |
197 |
– |
free((void *)distarr); |
382 |
|
return(my_default(ob, il, nm)); |
383 |
|
} |
384 |
+ |
if (il->sd != NULL && DOT(dir, fa->norm) < -FTINY) |
385 |
+ |
r1 = -1.0001*il->thick - 5.*FTINY; |
386 |
+ |
else |
387 |
+ |
r1 = 5.*FTINY; |
388 |
|
for (j = 0; j < 3; j++) |
389 |
< |
org[j] += .0001*fa->norm[j]; |
389 |
> |
org[j] += r1*fa->norm[j]; |
390 |
|
/* send sample */ |
391 |
< |
raysamp(dim[1]*nazi+dim[2], org, dir); |
391 |
> |
raysamp(dim[1], org, dir); |
392 |
|
} |
393 |
+ |
/* add in direct component? */ |
394 |
+ |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
395 |
+ |
MAT4 ixfm; |
396 |
+ |
if (il->sd == NULL) { |
397 |
+ |
for (i = 3; i--; ) { |
398 |
+ |
ixfm[i][0] = u[i]; |
399 |
+ |
ixfm[i][1] = v[i]; |
400 |
+ |
ixfm[i][2] = fa->norm[i]; |
401 |
+ |
ixfm[i][3] = 0.; |
402 |
+ |
} |
403 |
+ |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
404 |
+ |
ixfm[3][3] = 1.; |
405 |
+ |
} else { |
406 |
+ |
if (!invmat4(ixfm, xfm)) |
407 |
+ |
objerror(ob, INTERNAL, |
408 |
+ |
"cannot invert BSDF transform"); |
409 |
+ |
if (!(il->flags & IL_LIGHT)) |
410 |
+ |
new_discount(); |
411 |
+ |
} |
412 |
+ |
dim[0] = random(); |
413 |
+ |
nallow = 10*il->nsamps; |
414 |
+ |
for (i = 0; i < il->nsamps; i++) { |
415 |
+ |
/* randomize location */ |
416 |
+ |
h = dim[0] + samplendx++; |
417 |
+ |
do { |
418 |
+ |
multisamp(sp, 2, urand(h+nallow)); |
419 |
+ |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
420 |
+ |
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
421 |
+ |
for (j = 0; j < 3; j++) |
422 |
+ |
org[j] = r1*u[j] + r2*v[j] |
423 |
+ |
+ fa->offset*fa->norm[j]; |
424 |
+ |
} while (!inface(org, fa) && nallow-- > 0); |
425 |
+ |
if (nallow < 0) { |
426 |
+ |
objerror(ob, WARNING, "bad aspect"); |
427 |
+ |
rayclean(); |
428 |
+ |
freeface(ob); |
429 |
+ |
return(my_default(ob, il, nm)); |
430 |
+ |
} |
431 |
+ |
/* sample source rays */ |
432 |
+ |
srcsamps(il, org, fa->norm, ixfm); |
433 |
+ |
} |
434 |
+ |
} |
435 |
+ |
/* wait for all rays to finish */ |
436 |
|
rayclean(); |
437 |
+ |
if (il->sd != NULL) { /* run distribution through BSDF */ |
438 |
+ |
nalt = sqrt(il->sd->nout/PI) + .5; |
439 |
+ |
nazi = PI*nalt + .5; |
440 |
+ |
redistribute(il->sd, nalt, nazi, u, v, fa->norm, xfm); |
441 |
+ |
done_discount(); |
442 |
+ |
if (!il->sampdens) |
443 |
+ |
il->sampdens = nalt*nazi/PI + .999; |
444 |
+ |
} |
445 |
|
/* write out the face and its distribution */ |
446 |
< |
if (average(il, distarr, nalt*nazi)) { |
446 |
> |
if (average(il, distarr, n)) { |
447 |
|
if (il->sampdens > 0) |
448 |
|
flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
449 |
|
illumout(il, ob); |
452 |
|
/* clean up */ |
453 |
|
freeface(ob); |
454 |
|
return(0); |
216 |
– |
#undef MAXMISS |
455 |
|
} |
456 |
|
|
457 |
|
|
479 |
|
nalt = sqrt(2./PI*n) + .5; |
480 |
|
nazi = PI/2.*nalt + .5; |
481 |
|
} |
482 |
+ |
if (il->sd != NULL) |
483 |
+ |
objerror(ob, WARNING, "BSDF ignored"); |
484 |
|
n = nalt*nazi; |
485 |
|
newdist(n); |
486 |
|
dim[0] = random(); |
509 |
|
/* send sample */ |
510 |
|
raysamp(dim[1]*nazi+dim[2], org, dir); |
511 |
|
} |
512 |
+ |
/* wait for all rays to finish */ |
513 |
|
rayclean(); |
514 |
|
/* write out the sphere and its distribution */ |
515 |
< |
if (average(il, distarr, nalt*nazi)) { |
515 |
> |
if (average(il, distarr, n)) { |
516 |
|
if (il->sampdens > 0) |
517 |
|
roundout(il, distarr, nalt, nazi); |
518 |
|
else |
532 |
|
char *nm |
533 |
|
) |
534 |
|
{ |
535 |
< |
int dim[3]; |
536 |
< |
int n, nalt, nazi; |
537 |
< |
double sp[4], r1, r2, r3; |
535 |
> |
int dim[2]; |
536 |
> |
int n, nalt, nazi, alti; |
537 |
> |
double sp[2], r1, r2, r3; |
538 |
> |
int h; |
539 |
|
FVECT dn, org, dir; |
540 |
|
FVECT u, v; |
541 |
< |
register CONE *co; |
542 |
< |
register int i, j; |
541 |
> |
MAT4 xfm; |
542 |
> |
CONE *co; |
543 |
> |
int i, j; |
544 |
|
/* get/check arguments */ |
545 |
|
co = getcone(ob, 0); |
546 |
|
/* set up sampling */ |
547 |
< |
if (il->sampdens <= 0) |
548 |
< |
nalt = nazi = 1; |
549 |
< |
else { |
550 |
< |
n = PI * il->sampdens; |
551 |
< |
nalt = sqrt(n/PI) + .5; |
552 |
< |
nazi = PI*nalt + .5; |
547 |
> |
if (il->sd != NULL) { |
548 |
> |
if (!getBSDF_xfm(xfm, co->ad, il->udir)) { |
549 |
> |
objerror(ob, WARNING, "illegal up direction"); |
550 |
> |
freecone(ob); |
551 |
> |
return(my_default(ob, il, nm)); |
552 |
> |
} |
553 |
> |
n = il->sd->ninc; |
554 |
> |
} else { |
555 |
> |
if (il->sampdens <= 0) { |
556 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
557 |
> |
} else { |
558 |
> |
n = PI * il->sampdens; |
559 |
> |
nalt = sqrt(n/PI) + .5; |
560 |
> |
nazi = PI*nalt + .5; |
561 |
> |
} |
562 |
> |
n = nazi*nalt; |
563 |
|
} |
311 |
– |
n = nalt*nazi; |
564 |
|
newdist(n); |
565 |
|
mkaxes(u, v, co->ad); |
566 |
|
dim[0] = random(); |
567 |
|
/* sample disk */ |
568 |
< |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
317 |
< |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
568 |
> |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
569 |
|
for (i = 0; i < il->nsamps; i++) { |
570 |
|
/* next sample point */ |
571 |
< |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
572 |
< |
/* random direction */ |
573 |
< |
r1 = (dim[1] + sp[0])/nalt; |
574 |
< |
r2 = (dim[2] + sp[1] - .5)/nazi; |
575 |
< |
flatdir(dn, r1, r2); |
576 |
< |
for (j = 0; j < 3; j++) |
577 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
578 |
< |
/* random location */ |
571 |
> |
h = ilhash(dim,2) + i; |
572 |
> |
/* randomize direction */ |
573 |
> |
if (il->sd != NULL) { |
574 |
> |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
575 |
> |
} else { |
576 |
> |
multisamp(sp, 2, urand(h)); |
577 |
> |
alti = dim[1]/nazi; |
578 |
> |
r1 = (alti + sp[0])/nalt; |
579 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
580 |
> |
flatdir(dn, r1, r2); |
581 |
> |
for (j = 0; j < 3; j++) |
582 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
583 |
> |
} |
584 |
> |
/* randomize location */ |
585 |
> |
multisamp(sp, 2, urand(h+8371)); |
586 |
|
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
587 |
< |
sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
588 |
< |
r2 = 2.*PI*sp[3]; |
587 |
> |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
588 |
> |
r2 = 2.*PI*sp[1]; |
589 |
|
r1 = r3*cos(r2); |
590 |
|
r2 = r3*sin(r2); |
591 |
+ |
if (il->sd != NULL && DOT(dir, co->ad) < -FTINY) |
592 |
+ |
r3 = -1.0001*il->thick - 5.*FTINY; |
593 |
+ |
else |
594 |
+ |
r3 = 5.*FTINY; |
595 |
|
for (j = 0; j < 3; j++) |
596 |
|
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
597 |
< |
.0001*co->ad[j]; |
597 |
> |
r3*co->ad[j]; |
598 |
|
/* send sample */ |
599 |
< |
raysamp(dim[1]*nazi+dim[2], org, dir); |
599 |
> |
raysamp(dim[1], org, dir); |
600 |
|
} |
601 |
+ |
/* add in direct component? */ |
602 |
+ |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
603 |
+ |
MAT4 ixfm; |
604 |
+ |
if (il->sd == NULL) { |
605 |
+ |
for (i = 3; i--; ) { |
606 |
+ |
ixfm[i][0] = u[i]; |
607 |
+ |
ixfm[i][1] = v[i]; |
608 |
+ |
ixfm[i][2] = co->ad[i]; |
609 |
+ |
ixfm[i][3] = 0.; |
610 |
+ |
} |
611 |
+ |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
612 |
+ |
ixfm[3][3] = 1.; |
613 |
+ |
} else { |
614 |
+ |
if (!invmat4(ixfm, xfm)) |
615 |
+ |
objerror(ob, INTERNAL, |
616 |
+ |
"cannot invert BSDF transform"); |
617 |
+ |
if (!(il->flags & IL_LIGHT)) |
618 |
+ |
new_discount(); |
619 |
+ |
} |
620 |
+ |
dim[0] = random(); |
621 |
+ |
for (i = 0; i < il->nsamps; i++) { |
622 |
+ |
/* randomize location */ |
623 |
+ |
h = dim[0] + samplendx++; |
624 |
+ |
multisamp(sp, 2, urand(h)); |
625 |
+ |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
626 |
+ |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
627 |
+ |
r2 = 2.*PI*sp[1]; |
628 |
+ |
r1 = r3*cos(r2); |
629 |
+ |
r2 = r3*sin(r2); |
630 |
+ |
for (j = 0; j < 3; j++) |
631 |
+ |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j]; |
632 |
+ |
/* sample source rays */ |
633 |
+ |
srcsamps(il, org, co->ad, ixfm); |
634 |
+ |
} |
635 |
+ |
} |
636 |
+ |
/* wait for all rays to finish */ |
637 |
|
rayclean(); |
638 |
+ |
if (il->sd != NULL) { /* run distribution through BSDF */ |
639 |
+ |
nalt = sqrt(il->sd->nout/PI) + .5; |
640 |
+ |
nazi = PI*nalt + .5; |
641 |
+ |
redistribute(il->sd, nalt, nazi, u, v, co->ad, xfm); |
642 |
+ |
done_discount(); |
643 |
+ |
if (!il->sampdens) |
644 |
+ |
il->sampdens = nalt*nazi/PI + .999; |
645 |
+ |
} |
646 |
|
/* write out the ring and its distribution */ |
647 |
< |
if (average(il, distarr, nalt*nazi)) { |
647 |
> |
if (average(il, distarr, n)) { |
648 |
|
if (il->sampdens > 0) |
649 |
|
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
650 |
|
illumout(il, ob); |
653 |
|
/* clean up */ |
654 |
|
freecone(ob); |
655 |
|
return(1); |
350 |
– |
} |
351 |
– |
|
352 |
– |
|
353 |
– |
static void |
354 |
– |
mkaxes( /* compute u and v to go with n */ |
355 |
– |
FVECT u, |
356 |
– |
FVECT v, |
357 |
– |
FVECT n |
358 |
– |
) |
359 |
– |
{ |
360 |
– |
register int i; |
361 |
– |
|
362 |
– |
v[0] = v[1] = v[2] = 0.0; |
363 |
– |
for (i = 0; i < 3; i++) |
364 |
– |
if (n[i] < 0.6 && n[i] > -0.6) |
365 |
– |
break; |
366 |
– |
v[i] = 1.0; |
367 |
– |
fcross(u, v, n); |
368 |
– |
normalize(u); |
369 |
– |
fcross(v, n, u); |
370 |
– |
} |
371 |
– |
|
372 |
– |
|
373 |
– |
static void |
374 |
– |
rounddir( /* compute uniform spherical direction */ |
375 |
– |
register FVECT dv, |
376 |
– |
double alt, |
377 |
– |
double azi |
378 |
– |
) |
379 |
– |
{ |
380 |
– |
double d1, d2; |
381 |
– |
|
382 |
– |
dv[2] = 1. - 2.*alt; |
383 |
– |
d1 = sqrt(1. - dv[2]*dv[2]); |
384 |
– |
d2 = 2.*PI * azi; |
385 |
– |
dv[0] = d1*cos(d2); |
386 |
– |
dv[1] = d1*sin(d2); |
387 |
– |
} |
388 |
– |
|
389 |
– |
|
390 |
– |
static void |
391 |
– |
flatdir( /* compute uniform hemispherical direction */ |
392 |
– |
register FVECT dv, |
393 |
– |
double alt, |
394 |
– |
double azi |
395 |
– |
) |
396 |
– |
{ |
397 |
– |
double d1, d2; |
398 |
– |
|
399 |
– |
d1 = sqrt(alt); |
400 |
– |
d2 = 2.*PI * azi; |
401 |
– |
dv[0] = d1*cos(d2); |
402 |
– |
dv[1] = d1*sin(d2); |
403 |
– |
dv[2] = sqrt(1. - alt); |
656 |
|
} |