11 |
|
#include "face.h" |
12 |
|
#include "cone.h" |
13 |
|
#include "source.h" |
14 |
+ |
#include "paths.h" |
15 |
|
|
16 |
+ |
#ifndef R_EPS |
17 |
+ |
#define R_EPS 0.005 /* relative epsilon for ray origin */ |
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"); |
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 */ |
62 |
> |
smultscolor(r->rcol, r->rcoef); /* in case it's a source ray */ |
63 |
|
colp = &distarr[r->rno * 3]; |
64 |
< |
addcolor(colp, r->rcol); |
64 |
> |
addscolor(colp, r->rcol); |
65 |
|
return(1); |
66 |
|
} |
67 |
|
|
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)); |
92 |
|
srcsamps( /* sample sources from this surface position */ |
93 |
|
struct illum_args *il, |
94 |
|
FVECT org, |
95 |
< |
FVECT nrm, |
95 |
> |
double eps, |
96 |
|
MAT4 ixfm |
97 |
|
) |
98 |
|
{ |
99 |
< |
int nalt, nazi; |
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) { |
103 |
< |
nalt = nazi = 1; |
104 |
< |
} else { |
106 |
> |
if (il->sampdens > 0) { |
107 |
|
i = PI * il->sampdens; |
108 |
|
nalt = sqrt(i/PI) + .5; |
109 |
|
nazi = PI*nalt + .5; |
111 |
|
initsrcindex(&si); /* loop over (sub)sources */ |
112 |
|
for ( ; ; ) { |
113 |
|
VCOPY(sr.rorg, org); /* pick side to shoot from */ |
114 |
< |
if (il->sd != NULL) { |
113 |
< |
int sn = si.sn; |
114 |
< |
if (si.sp+1 >= si.np) ++sn; |
115 |
< |
if (sn >= nsources) break; |
116 |
< |
if (source[sn].sflags & SDISTANT) |
117 |
< |
d = DOT(source[sn].sloc, nrm); |
118 |
< |
else { |
119 |
< |
VSUB(v, source[sn].sloc, org); |
120 |
< |
d = DOT(v, nrm); |
121 |
< |
} |
122 |
< |
} else |
123 |
< |
d = 1.0; /* only transmission */ |
124 |
< |
if (d < 0.0) |
125 |
< |
d = -1.0001*il->thick - 5.*FTINY; |
126 |
< |
else |
127 |
< |
d = 5.*FTINY; |
128 |
< |
for (i = 3; i--; ) |
129 |
< |
sr.rorg[i] += d*nrm[i]; |
114 |
> |
samplendx++; /* increment sample counter */ |
115 |
|
if (!srcray(&sr, NULL, &si)) |
116 |
|
break; /* end of sources */ |
117 |
|
/* index direction */ |
119 |
|
multv3(v, sr.rdir, ixfm); |
120 |
|
else |
121 |
|
VCOPY(v, sr.rdir); |
122 |
< |
if (il->sd != NULL) { |
123 |
< |
i = getBSDF_incndx(il->sd, v); |
124 |
< |
if (i < 0) |
125 |
< |
continue; /* must not be important */ |
126 |
< |
sr.rno = i; |
142 |
< |
d = 1.0/getBSDF_incohm(il->sd, i); |
143 |
< |
} else { |
144 |
< |
if (v[2] >= -FTINY) |
145 |
< |
continue; /* only sample transmission */ |
146 |
< |
d = 1.0 - v[2]*v[2]; |
147 |
< |
i = d*nalt; |
148 |
< |
d = atan2(-v[1], -v[0])/(2.*PI); |
149 |
< |
if (d < 0.0) d += 1.0; |
150 |
< |
j = d*nazi + 0.5; |
151 |
< |
if (j >= nazi) j = 0; |
152 |
< |
sr.rno = i*nazi + j; |
153 |
< |
d = nalt*nazi/PI * -v[2]; |
154 |
< |
} |
122 |
> |
if (v[2] >= -FTINY) |
123 |
> |
continue; /* only sample transmission */ |
124 |
> |
v[0] = -v[0]; v[1] = -v[1]; v[2] = -v[2]; |
125 |
> |
sr.rno = flatindex(v, nalt, nazi); |
126 |
> |
d = nalt*nazi*(1./PI) * v[2]; |
127 |
|
d *= si.dom; /* solid angle correction */ |
128 |
< |
scalecolor(sr.rcoef, d); |
128 |
> |
scalescolor(sr.rcoef, d); |
129 |
> |
VSUM(sr.rorg, sr.rorg, sr.rdir, -eps); |
130 |
|
process_ray(&sr, ray_pqueue(&sr)); |
131 |
|
} |
132 |
|
} |
149 |
|
FVECT n |
150 |
|
) |
151 |
|
{ |
152 |
< |
register int i; |
180 |
< |
|
181 |
< |
v[0] = v[1] = v[2] = 0.0; |
182 |
< |
for (i = 0; i < 3; i++) |
183 |
< |
if (n[i] < 0.6 && n[i] > -0.6) |
184 |
< |
break; |
185 |
< |
v[i] = 1.0; |
186 |
< |
fcross(u, v, n); |
187 |
< |
normalize(u); |
152 |
> |
getperpendicular(u, n, 1); |
153 |
|
fcross(v, n, u); |
154 |
|
} |
155 |
|
|
156 |
|
|
157 |
|
static void |
158 |
|
rounddir( /* compute uniform spherical direction */ |
159 |
< |
register FVECT dv, |
159 |
> |
FVECT dv, |
160 |
|
double alt, |
161 |
|
double azi |
162 |
|
) |
189 |
|
|
190 |
|
|
191 |
|
int |
192 |
+ |
flatindex( /* compute index for hemispherical direction */ |
193 |
+ |
FVECT dv, |
194 |
+ |
int nalt, |
195 |
+ |
int nazi |
196 |
+ |
) |
197 |
+ |
{ |
198 |
+ |
double d; |
199 |
+ |
int i, j; |
200 |
+ |
|
201 |
+ |
d = 1.0 - dv[2]*dv[2]; |
202 |
+ |
i = d*nalt; |
203 |
+ |
d = atan2(dv[1], dv[0]) * (0.5/PI); |
204 |
+ |
if (d < 0.0) d += 1.0; |
205 |
+ |
j = d*nazi + 0.5; |
206 |
+ |
if (j >= nazi) j = 0; |
207 |
+ |
return(i*nazi + j); |
208 |
+ |
} |
209 |
+ |
|
210 |
+ |
|
211 |
+ |
int |
212 |
|
my_default( /* default illum action */ |
213 |
|
OBJREC *ob, |
214 |
|
struct illum_args *il, |
237 |
|
FVECT dn, org, dir; |
238 |
|
FVECT u, v; |
239 |
|
double ur[2], vr[2]; |
240 |
+ |
double epsilon; |
241 |
|
MAT4 xfm; |
242 |
+ |
char xfrot[64]; |
243 |
|
int nallow; |
244 |
|
FACE *fa; |
245 |
|
int i, j; |
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)) { |
268 |
< |
objerror(ob, WARNING, "illegal up direction"); |
269 |
< |
freeface(ob); |
270 |
< |
return(my_default(ob, il, nm)); |
271 |
< |
} |
272 |
< |
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 { |
277 |
< |
n = PI * il->sampdens; |
278 |
< |
nalt = sqrt(n/PI) + .5; |
279 |
< |
nazi = PI*nalt + .5; |
280 |
< |
} |
281 |
< |
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++) { |
287 |
|
dim[0] = random(); |
288 |
|
/* sample polygon */ |
289 |
|
nallow = 5*n*il->nsamps; |
290 |
+ |
epsilon = R_EPS*sqrt(fa->area); |
291 |
|
for (dim[1] = 0; dim[1] < n; dim[1]++) |
292 |
|
for (i = 0; i < il->nsamps; i++) { |
293 |
|
/* randomize direction */ |
294 |
|
h = ilhash(dim, 2) + i; |
295 |
< |
if (il->sd != NULL) { |
296 |
< |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
297 |
< |
} else { |
298 |
< |
multisamp(sp, 2, urand(h)); |
299 |
< |
alti = dim[1]/nazi; |
300 |
< |
r1 = (alti + sp[0])/nalt; |
322 |
< |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
323 |
< |
flatdir(dn, r1, r2); |
324 |
< |
for (j = 0; j < 3; j++) |
295 |
> |
multisamp(sp, 2, urand(h)); |
296 |
> |
alti = dim[1]/nazi; |
297 |
> |
r1 = (alti + sp[0])/nalt; |
298 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
299 |
> |
flatdir(dn, r1, r2); |
300 |
> |
for (j = 0; j < 3; j++) |
301 |
|
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - |
302 |
|
dn[2]*fa->norm[j]; |
327 |
– |
} |
303 |
|
/* randomize location */ |
304 |
|
do { |
305 |
|
multisamp(sp, 2, urand(h+4862+nallow)); |
315 |
|
freeface(ob); |
316 |
|
return(my_default(ob, il, nm)); |
317 |
|
} |
318 |
< |
if (il->sd != NULL && DOT(dir, fa->norm) < -FTINY) |
344 |
< |
r1 = -1.0001*il->thick - 5.*FTINY; |
345 |
< |
else |
346 |
< |
r1 = 5.*FTINY; |
347 |
< |
for (j = 0; j < 3; j++) |
348 |
< |
org[j] += r1*fa->norm[j]; |
318 |
> |
VSUM(org, org, dir, -epsilon); |
319 |
|
/* send sample */ |
320 |
|
raysamp(dim[1], org, dir); |
321 |
|
} |
322 |
|
/* add in direct component? */ |
323 |
< |
if (!directvis && il->flags & IL_LIGHT) { |
323 |
> |
if (il->flags & IL_LIGHT) { |
324 |
|
MAT4 ixfm; |
325 |
< |
if (il->sd == NULL) { |
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.; |
363 |
< |
ixfm[3][3] = 1.; |
364 |
< |
} else if (!invmat4(ixfm, xfm)) |
365 |
< |
objerror(ob, INTERNAL, "cannot invert BSDF transform"); |
325 |
> |
for (i = 3; i--; ) { |
326 |
> |
ixfm[i][0] = u[i]; |
327 |
> |
ixfm[i][1] = v[i]; |
328 |
> |
ixfm[i][2] = fa->norm[i]; |
329 |
> |
ixfm[i][3] = 0.; |
330 |
> |
} |
331 |
> |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
332 |
> |
ixfm[3][3] = 1.; |
333 |
|
dim[0] = random(); |
334 |
|
nallow = 10*il->nsamps; |
335 |
|
for (i = 0; i < il->nsamps; i++) { |
350 |
|
return(my_default(ob, il, nm)); |
351 |
|
} |
352 |
|
/* sample source rays */ |
353 |
< |
srcsamps(il, org, fa->norm, ixfm); |
353 |
> |
srcsamps(il, org, epsilon, ixfm); |
354 |
|
} |
355 |
|
} |
356 |
|
/* wait for all rays to finish */ |
357 |
|
rayclean(); |
391 |
– |
if (il->sd != NULL) { /* run distribution through BSDF */ |
392 |
– |
nalt = sqrt(il->sd->nout/PI) + .5; |
393 |
– |
nazi = PI*nalt + .5; |
394 |
– |
redistribute(il->sd, nalt, nazi, u, v, fa->norm, xfm); |
395 |
– |
if (!il->sampdens) |
396 |
– |
il->sampdens = nalt*nazi/PI + .999; |
397 |
– |
} |
358 |
|
/* write out the face and its distribution */ |
359 |
|
if (average(il, distarr, n)) { |
360 |
|
if (il->sampdens > 0) |
370 |
|
|
371 |
|
int |
372 |
|
my_sphere( /* make an illum sphere */ |
373 |
< |
register OBJREC *ob, |
373 |
> |
OBJREC *ob, |
374 |
|
struct illum_args *il, |
375 |
|
char *nm |
376 |
|
) |
380 |
|
double sp[4], r1, r2, r3; |
381 |
|
FVECT org, dir; |
382 |
|
FVECT u, v; |
383 |
< |
register int i, j; |
383 |
> |
int i, j; |
384 |
|
/* check arguments */ |
385 |
|
if (ob->oargs.nfargs != 4) |
386 |
|
objerror(ob, USER, "bad # of arguments"); |
392 |
|
nalt = sqrt(2./PI*n) + .5; |
393 |
|
nazi = PI/2.*nalt + .5; |
394 |
|
} |
435 |
– |
if (il->sd != NULL) |
436 |
– |
objerror(ob, WARNING, "BSDF ignored"); |
395 |
|
n = nalt*nazi; |
396 |
|
newdist(n); |
397 |
|
dim[0] = random(); |
446 |
|
int dim[2]; |
447 |
|
int n, nalt, nazi, alti; |
448 |
|
double sp[2], r1, r2, r3; |
449 |
+ |
double epsilon; |
450 |
|
int h; |
451 |
|
FVECT dn, org, dir; |
452 |
|
FVECT u, v; |
453 |
|
MAT4 xfm; |
454 |
|
CONE *co; |
455 |
|
int i, j; |
456 |
< |
/* get/check arguments */ |
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)) { |
461 |
< |
objerror(ob, WARNING, "illegal up direction"); |
462 |
< |
freecone(ob); |
504 |
< |
return(my_default(ob, il, nm)); |
505 |
< |
} |
506 |
< |
n = il->sd->ninc; |
458 |
> |
if (co == NULL) |
459 |
> |
objerror(ob, USER, "cannot create illum"); |
460 |
> |
/* set up sampling */ |
461 |
> |
if (il->sampdens <= 0) { |
462 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
463 |
|
} else { |
464 |
< |
if (il->sampdens <= 0) { |
465 |
< |
nalt = nazi = 1; /* diffuse assumption */ |
466 |
< |
} else { |
511 |
< |
n = PI * il->sampdens; |
512 |
< |
nalt = sqrt(n/PI) + .5; |
513 |
< |
nazi = PI*nalt + .5; |
514 |
< |
} |
515 |
< |
n = nazi*nalt; |
464 |
> |
n = PI * il->sampdens; |
465 |
> |
nalt = sqrt(n/PI) + .5; |
466 |
> |
nazi = PI*nalt + .5; |
467 |
|
} |
468 |
+ |
epsilon = R_EPS*CO_R1(co); |
469 |
+ |
n = nazi*nalt; |
470 |
|
newdist(n); |
471 |
|
mkaxes(u, v, co->ad); |
472 |
|
dim[0] = random(); |
476 |
|
/* next sample point */ |
477 |
|
h = ilhash(dim,2) + i; |
478 |
|
/* randomize direction */ |
479 |
< |
if (il->sd != NULL) { |
480 |
< |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
481 |
< |
} else { |
482 |
< |
multisamp(sp, 2, urand(h)); |
483 |
< |
alti = dim[1]/nazi; |
484 |
< |
r1 = (alti + sp[0])/nalt; |
485 |
< |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
533 |
< |
flatdir(dn, r1, r2); |
534 |
< |
for (j = 0; j < 3; j++) |
535 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
536 |
< |
} |
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; |
483 |
> |
flatdir(dn, r1, r2); |
484 |
> |
for (j = 0; j < 3; j++) |
485 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
486 |
|
/* randomize location */ |
487 |
|
multisamp(sp, 2, urand(h+8371)); |
488 |
|
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
490 |
|
r2 = 2.*PI*sp[1]; |
491 |
|
r1 = r3*cos(r2); |
492 |
|
r2 = r3*sin(r2); |
544 |
– |
if (il->sd != NULL && DOT(dir, co->ad) < -FTINY) |
545 |
– |
r3 = -1.0001*il->thick - 5.*FTINY; |
546 |
– |
else |
547 |
– |
r3 = 5.*FTINY; |
493 |
|
for (j = 0; j < 3; j++) |
494 |
|
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
495 |
< |
r3*co->ad[j]; |
495 |
> |
epsilon*co->ad[j]; |
496 |
|
/* send sample */ |
497 |
|
raysamp(dim[1], org, dir); |
498 |
|
} |
499 |
|
/* add in direct component? */ |
500 |
< |
if (!directvis && il->flags & IL_LIGHT) { |
500 |
> |
if (il->flags & IL_LIGHT) { |
501 |
|
MAT4 ixfm; |
502 |
< |
if (il->sd == NULL) { |
503 |
< |
for (i = 3; i--; ) { |
504 |
< |
ixfm[i][0] = u[i]; |
505 |
< |
ixfm[i][1] = v[i]; |
506 |
< |
ixfm[i][2] = co->ad[i]; |
507 |
< |
ixfm[i][3] = 0.; |
508 |
< |
} |
509 |
< |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
565 |
< |
ixfm[3][3] = 1.; |
566 |
< |
} else if (!invmat4(ixfm, xfm)) |
567 |
< |
objerror(ob, INTERNAL, "cannot invert BSDF transform"); |
502 |
> |
for (i = 3; i--; ) { |
503 |
> |
ixfm[i][0] = u[i]; |
504 |
> |
ixfm[i][1] = v[i]; |
505 |
> |
ixfm[i][2] = co->ad[i]; |
506 |
> |
ixfm[i][3] = 0.; |
507 |
> |
} |
508 |
> |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
509 |
> |
ixfm[3][3] = 1.; |
510 |
|
dim[0] = random(); |
511 |
|
for (i = 0; i < il->nsamps; i++) { |
512 |
|
/* randomize location */ |
520 |
|
for (j = 0; j < 3; j++) |
521 |
|
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j]; |
522 |
|
/* sample source rays */ |
523 |
< |
srcsamps(il, org, co->ad, ixfm); |
523 |
> |
srcsamps(il, org, epsilon, ixfm); |
524 |
|
} |
525 |
|
} |
526 |
|
/* wait for all rays to finish */ |
527 |
|
rayclean(); |
586 |
– |
if (il->sd != NULL) { /* run distribution through BSDF */ |
587 |
– |
nalt = sqrt(il->sd->nout/PI) + .5; |
588 |
– |
nazi = PI*nalt + .5; |
589 |
– |
redistribute(il->sd, nalt, nazi, u, v, co->ad, xfm); |
590 |
– |
if (!il->sampdens) |
591 |
– |
il->sampdens = nalt*nazi/PI + .999; |
592 |
– |
} |
528 |
|
/* write out the ring and its distribution */ |
529 |
|
if (average(il, distarr, n)) { |
530 |
|
if (il->sampdens > 0) |