1 |
– |
/* Copyright (c) 1991 Regents of the University of California */ |
2 |
– |
|
1 |
|
#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
|
#endif |
6 |
– |
|
4 |
|
/* |
5 |
|
* Routines to do the actual calculation for mkillum |
6 |
|
*/ |
7 |
|
|
8 |
< |
#include "mkillum.h" |
8 |
> |
#include <string.h> |
9 |
|
|
10 |
+ |
#include "mkillum.h" |
11 |
|
#include "face.h" |
14 |
– |
|
12 |
|
#include "cone.h" |
13 |
+ |
#include "source.h" |
14 |
+ |
#include "paths.h" |
15 |
|
|
16 |
< |
#include "random.h" |
16 |
> |
#ifndef NBSDFSAMPS |
17 |
> |
#define NBSDFSAMPS 256 /* BSDF resampling count */ |
18 |
> |
#endif |
19 |
|
|
20 |
+ |
COLORV * distarr = NULL; /* distribution array */ |
21 |
+ |
int distsiz = 0; |
22 |
+ |
COLORV * direct_discount = NULL; /* amount to take off direct */ |
23 |
|
|
24 |
< |
o_default(ob, il, rt, nm) /* default illum action */ |
25 |
< |
OBJREC *ob; |
26 |
< |
struct illum_args *il; |
27 |
< |
struct rtproc *rt; |
28 |
< |
char *nm; |
24 |
> |
|
25 |
> |
void |
26 |
> |
newdist( /* allocate & clear distribution array */ |
27 |
> |
int siz |
28 |
> |
) |
29 |
|
{ |
30 |
+ |
if (siz <= 0) { |
31 |
+ |
if (distsiz > 0) |
32 |
+ |
free(distarr); |
33 |
+ |
distarr = NULL; |
34 |
+ |
distsiz = 0; |
35 |
+ |
return; |
36 |
+ |
} |
37 |
+ |
if (distsiz < siz) { |
38 |
+ |
if (distsiz > 0) |
39 |
+ |
free(distarr); |
40 |
+ |
distarr = (COLORV *)malloc(sizeof(COLOR)*siz); |
41 |
+ |
if (distarr == NULL) |
42 |
+ |
error(SYSTEM, "out of memory in newdist"); |
43 |
+ |
distsiz = siz; |
44 |
+ |
} |
45 |
+ |
memset(distarr, '\0', sizeof(COLOR)*siz); |
46 |
+ |
} |
47 |
+ |
|
48 |
+ |
|
49 |
+ |
static void |
50 |
+ |
new_discount() /* allocate space for direct contrib. record */ |
51 |
+ |
{ |
52 |
+ |
if (distsiz <= 0) |
53 |
+ |
return; |
54 |
+ |
direct_discount = (COLORV *)calloc(distsiz, sizeof(COLOR)); |
55 |
+ |
if (direct_discount == NULL) |
56 |
+ |
error(SYSTEM, "out of memory in new_discount"); |
57 |
+ |
} |
58 |
+ |
|
59 |
+ |
|
60 |
+ |
static void |
61 |
+ |
done_discount() /* clear off direct contrib. record */ |
62 |
+ |
{ |
63 |
+ |
if (direct_discount == NULL) |
64 |
+ |
return; |
65 |
+ |
free(direct_discount); |
66 |
+ |
direct_discount = NULL; |
67 |
+ |
} |
68 |
+ |
|
69 |
+ |
|
70 |
+ |
int |
71 |
+ |
process_ray( /* process a ray result or report error */ |
72 |
+ |
RAY *r, |
73 |
+ |
int rv |
74 |
+ |
) |
75 |
+ |
{ |
76 |
+ |
COLORV *colp; |
77 |
+ |
|
78 |
+ |
if (rv == 0) /* no result ready */ |
79 |
+ |
return(0); |
80 |
+ |
if (rv < 0) |
81 |
+ |
error(USER, "ray tracing process died"); |
82 |
+ |
if (r->rno >= distsiz) |
83 |
+ |
error(INTERNAL, "bad returned index in process_ray"); |
84 |
+ |
multcolor(r->rcol, r->rcoef); /* in case it's a source ray */ |
85 |
+ |
colp = &distarr[r->rno * 3]; |
86 |
+ |
addcolor(colp, r->rcol); |
87 |
+ |
if (r->rsrc >= 0 && /* remember source contrib. */ |
88 |
+ |
direct_discount != NULL) { |
89 |
+ |
colp = &direct_discount[r->rno * 3]; |
90 |
+ |
addcolor(colp, r->rcol); |
91 |
+ |
} |
92 |
+ |
return(1); |
93 |
+ |
} |
94 |
+ |
|
95 |
+ |
|
96 |
+ |
void |
97 |
+ |
raysamp( /* queue a ray sample */ |
98 |
+ |
int ndx, |
99 |
+ |
FVECT org, |
100 |
+ |
FVECT dir |
101 |
+ |
) |
102 |
+ |
{ |
103 |
+ |
RAY myRay; |
104 |
+ |
int rv; |
105 |
+ |
|
106 |
+ |
if ((ndx < 0) | (ndx >= distsiz)) |
107 |
+ |
error(INTERNAL, "bad index in raysamp"); |
108 |
+ |
VCOPY(myRay.rorg, org); |
109 |
+ |
VCOPY(myRay.rdir, dir); |
110 |
+ |
myRay.rmax = .0; |
111 |
+ |
rayorigin(&myRay, PRIMARY|SPECULAR, NULL, NULL); |
112 |
+ |
myRay.rno = ndx; |
113 |
+ |
/* queue ray, check result */ |
114 |
+ |
process_ray(&myRay, ray_pqueue(&myRay)); |
115 |
+ |
} |
116 |
+ |
|
117 |
+ |
|
118 |
+ |
void |
119 |
+ |
srcsamps( /* sample sources from this surface position */ |
120 |
+ |
struct illum_args *il, |
121 |
+ |
FVECT org, |
122 |
+ |
FVECT nrm, |
123 |
+ |
MAT4 ixfm |
124 |
+ |
) |
125 |
+ |
{ |
126 |
+ |
int nalt=1, nazi=1; |
127 |
+ |
SRCINDEX si; |
128 |
+ |
RAY sr; |
129 |
+ |
FVECT v; |
130 |
+ |
double d; |
131 |
+ |
int i, j; |
132 |
+ |
/* get sampling density */ |
133 |
+ |
if (il->sd == NULL && il->sampdens > 0) { |
134 |
+ |
i = PI * il->sampdens; |
135 |
+ |
nalt = sqrt(i/PI) + .5; |
136 |
+ |
nazi = PI*nalt + .5; |
137 |
+ |
} |
138 |
+ |
initsrcindex(&si); /* loop over (sub)sources */ |
139 |
+ |
for ( ; ; ) { |
140 |
+ |
VCOPY(sr.rorg, org); /* pick side to shoot from */ |
141 |
+ |
if (il->sd != NULL) { |
142 |
+ |
int sn = si.sn; |
143 |
+ |
if (si.sp+1 >= si.np) ++sn; |
144 |
+ |
if (sn >= nsources) break; |
145 |
+ |
if (source[sn].sflags & SDISTANT) |
146 |
+ |
d = DOT(source[sn].sloc, nrm); |
147 |
+ |
else { |
148 |
+ |
VSUB(v, source[sn].sloc, org); |
149 |
+ |
d = DOT(v, nrm); |
150 |
+ |
} |
151 |
+ |
} else |
152 |
+ |
d = 1.0; /* only transmission */ |
153 |
+ |
if (d < 0.0) |
154 |
+ |
d = -1.0001*il->thick - 5.*FTINY; |
155 |
+ |
else |
156 |
+ |
d = 5.*FTINY; |
157 |
+ |
VSUM(sr.rorg, sr.rorg, nrm, d); |
158 |
+ |
samplendx++; /* increment sample counter */ |
159 |
+ |
if (!srcray(&sr, NULL, &si)) |
160 |
+ |
break; /* end of sources */ |
161 |
+ |
/* index direction */ |
162 |
+ |
if (ixfm != NULL) |
163 |
+ |
multv3(v, sr.rdir, ixfm); |
164 |
+ |
else |
165 |
+ |
VCOPY(v, sr.rdir); |
166 |
+ |
if (il->sd != NULL) { |
167 |
+ |
i = getBSDF_incndx(il->sd, v); |
168 |
+ |
if (i < 0) |
169 |
+ |
continue; /* must not be important */ |
170 |
+ |
sr.rno = i; |
171 |
+ |
d = 1.0/getBSDF_incohm(il->sd, i); |
172 |
+ |
} else { |
173 |
+ |
if (v[2] >= -FTINY) |
174 |
+ |
continue; /* only sample transmission */ |
175 |
+ |
v[0] = -v[0]; v[1] = -v[1]; v[2] = -v[2]; |
176 |
+ |
sr.rno = flatindex(v, nalt, nazi); |
177 |
+ |
d = nalt*nazi*(1./PI) * v[2]; |
178 |
+ |
} |
179 |
+ |
d *= si.dom; /* solid angle correction */ |
180 |
+ |
scalecolor(sr.rcoef, d); |
181 |
+ |
process_ray(&sr, ray_pqueue(&sr)); |
182 |
+ |
} |
183 |
+ |
} |
184 |
+ |
|
185 |
+ |
|
186 |
+ |
void |
187 |
+ |
rayclean() /* finish all pending rays */ |
188 |
+ |
{ |
189 |
+ |
RAY myRay; |
190 |
+ |
|
191 |
+ |
while (process_ray(&myRay, ray_presult(&myRay, 0))) |
192 |
+ |
; |
193 |
+ |
} |
194 |
+ |
|
195 |
+ |
|
196 |
+ |
static void |
197 |
+ |
mkaxes( /* compute u and v to go with n */ |
198 |
+ |
FVECT u, |
199 |
+ |
FVECT v, |
200 |
+ |
FVECT n |
201 |
+ |
) |
202 |
+ |
{ |
203 |
+ |
register int i; |
204 |
+ |
|
205 |
+ |
v[0] = v[1] = v[2] = 0.0; |
206 |
+ |
for (i = 0; i < 3; i++) |
207 |
+ |
if (n[i] < 0.6 && n[i] > -0.6) |
208 |
+ |
break; |
209 |
+ |
v[i] = 1.0; |
210 |
+ |
fcross(u, v, n); |
211 |
+ |
normalize(u); |
212 |
+ |
fcross(v, n, u); |
213 |
+ |
} |
214 |
+ |
|
215 |
+ |
|
216 |
+ |
static void |
217 |
+ |
rounddir( /* compute uniform spherical direction */ |
218 |
+ |
register FVECT dv, |
219 |
+ |
double alt, |
220 |
+ |
double azi |
221 |
+ |
) |
222 |
+ |
{ |
223 |
+ |
double d1, d2; |
224 |
+ |
|
225 |
+ |
dv[2] = 1. - 2.*alt; |
226 |
+ |
d1 = sqrt(1. - dv[2]*dv[2]); |
227 |
+ |
d2 = 2.*PI * azi; |
228 |
+ |
dv[0] = d1*cos(d2); |
229 |
+ |
dv[1] = d1*sin(d2); |
230 |
+ |
} |
231 |
+ |
|
232 |
+ |
|
233 |
+ |
void |
234 |
+ |
flatdir( /* compute uniform hemispherical direction */ |
235 |
+ |
FVECT dv, |
236 |
+ |
double alt, |
237 |
+ |
double azi |
238 |
+ |
) |
239 |
+ |
{ |
240 |
+ |
double d1, d2; |
241 |
+ |
|
242 |
+ |
d1 = sqrt(alt); |
243 |
+ |
d2 = 2.*PI * azi; |
244 |
+ |
dv[0] = d1*cos(d2); |
245 |
+ |
dv[1] = d1*sin(d2); |
246 |
+ |
dv[2] = sqrt(1. - alt); |
247 |
+ |
} |
248 |
+ |
|
249 |
+ |
|
250 |
+ |
int |
251 |
+ |
flatindex( /* compute index for hemispherical direction */ |
252 |
+ |
FVECT dv, |
253 |
+ |
int nalt, |
254 |
+ |
int nazi |
255 |
+ |
) |
256 |
+ |
{ |
257 |
+ |
double d; |
258 |
+ |
int i, j; |
259 |
+ |
|
260 |
+ |
d = 1.0 - dv[2]*dv[2]; |
261 |
+ |
i = d*nalt; |
262 |
+ |
d = atan2(dv[1], dv[0]) * (0.5/PI); |
263 |
+ |
if (d < 0.0) d += 1.0; |
264 |
+ |
j = d*nazi + 0.5; |
265 |
+ |
if (j >= nazi) j = 0; |
266 |
+ |
return(i*nazi + j); |
267 |
+ |
} |
268 |
+ |
|
269 |
+ |
|
270 |
+ |
int |
271 |
+ |
printgeom( /* print out detailed geometry for BSDF */ |
272 |
+ |
struct BSDF_data *sd, |
273 |
+ |
char *xfrot, |
274 |
+ |
FVECT ctr, |
275 |
+ |
double s1, |
276 |
+ |
double s2 |
277 |
+ |
) |
278 |
+ |
{ |
279 |
+ |
static char mgftemp[] = TEMPLATE; |
280 |
+ |
char cmdbuf[64]; |
281 |
+ |
FILE *fp; |
282 |
+ |
double sca; |
283 |
+ |
|
284 |
+ |
if (sd == NULL || sd->mgf == NULL) |
285 |
+ |
return(0); |
286 |
+ |
if (sd->dim[0] <= FTINY || sd->dim[1] <= FTINY) |
287 |
+ |
return(0); |
288 |
+ |
if ((s1 > s2) ^ (sd->dim[0] > sd->dim[1])) { |
289 |
+ |
sca = s1; s1 = s2; s2 = sca; |
290 |
+ |
} |
291 |
+ |
s1 /= sd->dim[0]; |
292 |
+ |
s2 /= sd->dim[1]; |
293 |
+ |
sca = s1 > s2 ? s1 : s2; |
294 |
+ |
strcpy(mgftemp, TEMPLATE); |
295 |
+ |
if ((fp = fopen(mktemp(mgftemp), "w")) == NULL) |
296 |
+ |
error(SYSTEM, "cannot create temporary file for MGF"); |
297 |
+ |
/* prepend our transform */ |
298 |
+ |
fprintf(fp, "xf%s -s %.5f -t %.5g %.5g %.5g\n", |
299 |
+ |
xfrot, sca, ctr[0], ctr[1], ctr[2]); |
300 |
+ |
/* output given MGF description */ |
301 |
+ |
fputs(sd->mgf, fp); |
302 |
+ |
fputs("\nxf\n", fp); |
303 |
+ |
if (fclose(fp) == EOF) |
304 |
+ |
error(SYSTEM, "error writing MGF temporary file"); |
305 |
+ |
/* execute mgf2rad to convert MGF */ |
306 |
+ |
strcpy(cmdbuf, "mgf2rad "); |
307 |
+ |
strcpy(cmdbuf+8, mgftemp); |
308 |
+ |
fflush(stdout); |
309 |
+ |
system(cmdbuf); |
310 |
+ |
unlink(mgftemp); /* clean up */ |
311 |
+ |
return(1); |
312 |
+ |
} |
313 |
+ |
|
314 |
+ |
|
315 |
+ |
int |
316 |
+ |
my_default( /* default illum action */ |
317 |
+ |
OBJREC *ob, |
318 |
+ |
struct illum_args *il, |
319 |
+ |
char *nm |
320 |
+ |
) |
321 |
+ |
{ |
322 |
|
sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"", |
323 |
|
nm, ofun[ob->otype].funame, ob->oname); |
324 |
|
error(WARNING, errmsg); |
325 |
< |
if (!(il->flags & IL_LIGHT)) |
326 |
< |
printobj(il->altmat, ob); |
325 |
> |
printobj(il->altmat, ob); |
326 |
> |
return(1); |
327 |
|
} |
328 |
|
|
329 |
|
|
330 |
< |
o_face(ob, il, rt, nm) /* make an illum face */ |
331 |
< |
OBJREC *ob; |
332 |
< |
struct illum_args *il; |
333 |
< |
struct rtproc *rt; |
334 |
< |
char *nm; |
330 |
> |
int |
331 |
> |
my_face( /* make an illum face */ |
332 |
> |
OBJREC *ob, |
333 |
> |
struct illum_args *il, |
334 |
> |
char *nm |
335 |
> |
) |
336 |
|
{ |
337 |
< |
#define MAXMISS (5*n*il->nsamps) |
338 |
< |
int dim[3]; |
42 |
< |
int n, nalt, nazi, h; |
43 |
< |
float *distarr; |
337 |
> |
int dim[2]; |
338 |
> |
int n, nalt, nazi, alti; |
339 |
|
double sp[2], r1, r2; |
340 |
+ |
int h; |
341 |
|
FVECT dn, org, dir; |
342 |
|
FVECT u, v; |
343 |
|
double ur[2], vr[2]; |
344 |
< |
int nmisses; |
345 |
< |
register FACE *fa; |
346 |
< |
register int i, j; |
344 |
> |
MAT4 xfm; |
345 |
> |
char xfrot[64]; |
346 |
> |
int nallow; |
347 |
> |
FACE *fa; |
348 |
> |
int i, j; |
349 |
|
/* get/check arguments */ |
350 |
|
fa = getface(ob); |
351 |
|
if (fa->area == 0.0) { |
352 |
|
freeface(ob); |
353 |
< |
o_default(ob, il, rt, nm); |
56 |
< |
return; |
353 |
> |
return(my_default(ob, il, nm)); |
354 |
|
} |
355 |
|
/* set up sampling */ |
356 |
< |
n = PI * il->sampdens; |
357 |
< |
nalt = sqrt(n/PI) + .5; |
358 |
< |
nazi = PI*nalt + .5; |
359 |
< |
n = nalt*nazi; |
360 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
361 |
< |
if (distarr == NULL) |
362 |
< |
error(SYSTEM, "out of memory in o_face"); |
363 |
< |
mkaxes(u, v, fa->norm); |
356 |
> |
if (il->sd != NULL) { |
357 |
> |
if (!getBSDF_xfm(xfm, fa->norm, il->udir, xfrot)) { |
358 |
> |
objerror(ob, WARNING, "illegal up direction"); |
359 |
> |
freeface(ob); |
360 |
> |
return(my_default(ob, il, nm)); |
361 |
> |
} |
362 |
> |
n = il->sd->ninc; |
363 |
> |
} else { |
364 |
> |
if (il->sampdens <= 0) { |
365 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
366 |
> |
} else { |
367 |
> |
n = PI * il->sampdens; |
368 |
> |
nalt = sqrt(n/PI) + .5; |
369 |
> |
nazi = PI*nalt + .5; |
370 |
> |
} |
371 |
> |
n = nazi*nalt; |
372 |
> |
} |
373 |
> |
newdist(n); |
374 |
> |
/* take first edge >= sqrt(area) */ |
375 |
> |
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
376 |
> |
u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0]; |
377 |
> |
u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1]; |
378 |
> |
u[2] = VERTEX(fa,i)[2] - VERTEX(fa,j)[2]; |
379 |
> |
if ((r1 = DOT(u,u)) >= fa->area-FTINY) |
380 |
> |
break; |
381 |
> |
} |
382 |
> |
if (i < fa->nv) { /* got one! -- let's align our axes */ |
383 |
> |
r2 = 1.0/sqrt(r1); |
384 |
> |
u[0] *= r2; u[1] *= r2; u[2] *= r2; |
385 |
> |
fcross(v, fa->norm, u); |
386 |
> |
} else /* oh well, we'll just have to wing it */ |
387 |
> |
mkaxes(u, v, fa->norm); |
388 |
> |
/* now, find limits in (u,v) coordinates */ |
389 |
|
ur[0] = vr[0] = FHUGE; |
390 |
|
ur[1] = vr[1] = -FHUGE; |
391 |
|
for (i = 0; i < fa->nv; i++) { |
396 |
|
if (r2 < vr[0]) vr[0] = r2; |
397 |
|
if (r2 > vr[1]) vr[1] = r2; |
398 |
|
} |
399 |
+ |
/* output detailed geometry? */ |
400 |
+ |
if (!(il->flags & IL_LIGHT) && il->sd != NULL && il->sd->mgf != NULL && |
401 |
+ |
il->thick <= FTINY) { |
402 |
+ |
for (j = 3; j--; ) |
403 |
+ |
org[j] = .5*(ur[0]+ur[1])*u[j] + |
404 |
+ |
.5*(vr[0]+vr[1])*v[j] + |
405 |
+ |
fa->offset*fa->norm[j]; |
406 |
+ |
printgeom(il->sd, xfrot, org, ur[1]-ur[0], vr[1]-vr[0]); |
407 |
+ |
} |
408 |
|
dim[0] = random(); |
409 |
|
/* sample polygon */ |
410 |
< |
nmisses = 0; |
411 |
< |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
81 |
< |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
410 |
> |
nallow = 5*n*il->nsamps; |
411 |
> |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
412 |
|
for (i = 0; i < il->nsamps; i++) { |
413 |
< |
/* random direction */ |
414 |
< |
h = ilhash(dim, 3) + i; |
415 |
< |
peano(sp, 2, urand(h), .02); |
416 |
< |
r1 = (dim[1] + sp[0])/nalt; |
417 |
< |
r2 = (dim[2] + sp[1])/nazi; |
418 |
< |
flatdir(dn, r1, r2); |
419 |
< |
for (j = 0; j < 3; j++) |
420 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
421 |
< |
/* random location */ |
413 |
> |
/* randomize direction */ |
414 |
> |
h = ilhash(dim, 2) + i; |
415 |
> |
if (il->sd != NULL) { |
416 |
> |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
417 |
> |
} else { |
418 |
> |
multisamp(sp, 2, urand(h)); |
419 |
> |
alti = dim[1]/nazi; |
420 |
> |
r1 = (alti + sp[0])/nalt; |
421 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
422 |
> |
flatdir(dn, r1, r2); |
423 |
> |
for (j = 0; j < 3; j++) |
424 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - |
425 |
> |
dn[2]*fa->norm[j]; |
426 |
> |
} |
427 |
> |
/* randomize location */ |
428 |
|
do { |
429 |
< |
peano(sp, 2, urand(h+nmisses), .01); |
429 |
> |
multisamp(sp, 2, urand(h+4862+nallow)); |
430 |
|
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
431 |
|
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
432 |
|
for (j = 0; j < 3; j++) |
433 |
|
org[j] = r1*u[j] + r2*v[j] |
434 |
|
+ fa->offset*fa->norm[j]; |
435 |
< |
} while (!inface(org, fa) && nmisses++ < MAXMISS); |
436 |
< |
if (nmisses > MAXMISS) { |
435 |
> |
} while (!inface(org, fa) && nallow-- > 0); |
436 |
> |
if (nallow < 0) { |
437 |
|
objerror(ob, WARNING, "bad aspect"); |
438 |
< |
rt->nrays = 0; |
438 |
> |
rayclean(); |
439 |
|
freeface(ob); |
440 |
< |
free((char *)distarr); |
105 |
< |
o_default(ob, il, rt, nm); |
106 |
< |
return; |
440 |
> |
return(my_default(ob, il, nm)); |
441 |
|
} |
442 |
+ |
if (il->sd != NULL && DOT(dir, fa->norm) < -FTINY) |
443 |
+ |
r1 = -1.0001*il->thick - 5.*FTINY; |
444 |
+ |
else |
445 |
+ |
r1 = 5.*FTINY; |
446 |
|
for (j = 0; j < 3; j++) |
447 |
< |
org[j] += .001*fa->norm[j]; |
447 |
> |
org[j] += r1*fa->norm[j]; |
448 |
|
/* send sample */ |
449 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
449 |
> |
raysamp(dim[1], org, dir); |
450 |
|
} |
451 |
< |
rayflush(rt); |
452 |
< |
/* write out the face w/ distribution */ |
453 |
< |
flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
454 |
< |
illumout(il, ob); |
451 |
> |
/* add in direct component? */ |
452 |
> |
if (il->flags & IL_LIGHT || il->sd != NULL) { |
453 |
> |
MAT4 ixfm; |
454 |
> |
if (il->sd == NULL) { |
455 |
> |
for (i = 3; i--; ) { |
456 |
> |
ixfm[i][0] = u[i]; |
457 |
> |
ixfm[i][1] = v[i]; |
458 |
> |
ixfm[i][2] = fa->norm[i]; |
459 |
> |
ixfm[i][3] = 0.; |
460 |
> |
} |
461 |
> |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
462 |
> |
ixfm[3][3] = 1.; |
463 |
> |
} else { |
464 |
> |
if (!invmat4(ixfm, xfm)) |
465 |
> |
objerror(ob, INTERNAL, |
466 |
> |
"cannot invert BSDF transform"); |
467 |
> |
if (!(il->flags & IL_LIGHT)) |
468 |
> |
new_discount(); |
469 |
> |
} |
470 |
> |
dim[0] = random(); |
471 |
> |
nallow = 10*il->nsamps; |
472 |
> |
for (i = 0; i < il->nsamps; i++) { |
473 |
> |
/* randomize location */ |
474 |
> |
h = dim[0] + samplendx++; |
475 |
> |
do { |
476 |
> |
multisamp(sp, 2, urand(h+nallow)); |
477 |
> |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
478 |
> |
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
479 |
> |
for (j = 0; j < 3; j++) |
480 |
> |
org[j] = r1*u[j] + r2*v[j] |
481 |
> |
+ fa->offset*fa->norm[j]; |
482 |
> |
} while (!inface(org, fa) && nallow-- > 0); |
483 |
> |
if (nallow < 0) { |
484 |
> |
objerror(ob, WARNING, "bad aspect"); |
485 |
> |
rayclean(); |
486 |
> |
freeface(ob); |
487 |
> |
return(my_default(ob, il, nm)); |
488 |
> |
} |
489 |
> |
/* sample source rays */ |
490 |
> |
srcsamps(il, org, fa->norm, ixfm); |
491 |
> |
} |
492 |
> |
} |
493 |
> |
/* wait for all rays to finish */ |
494 |
> |
rayclean(); |
495 |
> |
if (il->sd != NULL) { /* run distribution through BSDF */ |
496 |
> |
nalt = sqrt(il->sd->nout/PI) + .5; |
497 |
> |
nazi = PI*nalt + .5; |
498 |
> |
redistribute(il->sd, nalt, nazi, u, v, fa->norm, xfm); |
499 |
> |
done_discount(); |
500 |
> |
if (!il->sampdens) |
501 |
> |
il->sampdens = nalt*nazi/PI + .999; |
502 |
> |
} |
503 |
> |
/* write out the face and its distribution */ |
504 |
> |
if (average(il, distarr, n)) { |
505 |
> |
if (il->sampdens > 0) |
506 |
> |
flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
507 |
> |
illumout(il, ob); |
508 |
> |
} else |
509 |
> |
printobj(il->altmat, ob); |
510 |
|
/* clean up */ |
511 |
|
freeface(ob); |
512 |
< |
free((char *)distarr); |
120 |
< |
#undef MAXMISS |
512 |
> |
return(0); |
513 |
|
} |
514 |
|
|
515 |
|
|
516 |
< |
o_sphere(ob, il, rt, nm) /* make an illum sphere */ |
517 |
< |
register OBJREC *ob; |
518 |
< |
struct illum_args *il; |
519 |
< |
struct rtproc *rt; |
520 |
< |
char *nm; |
516 |
> |
int |
517 |
> |
my_sphere( /* make an illum sphere */ |
518 |
> |
register OBJREC *ob, |
519 |
> |
struct illum_args *il, |
520 |
> |
char *nm |
521 |
> |
) |
522 |
|
{ |
523 |
|
int dim[3]; |
524 |
|
int n, nalt, nazi; |
132 |
– |
float *distarr; |
525 |
|
double sp[4], r1, r2, r3; |
526 |
|
FVECT org, dir; |
527 |
|
FVECT u, v; |
530 |
|
if (ob->oargs.nfargs != 4) |
531 |
|
objerror(ob, USER, "bad # of arguments"); |
532 |
|
/* set up sampling */ |
533 |
< |
n = 4.*PI * il->sampdens; |
534 |
< |
nalt = sqrt(n/PI) + .5; |
535 |
< |
nazi = PI*nalt + .5; |
533 |
> |
if (il->sampdens <= 0) |
534 |
> |
nalt = nazi = 1; |
535 |
> |
else { |
536 |
> |
n = 4.*PI * il->sampdens; |
537 |
> |
nalt = sqrt(2./PI*n) + .5; |
538 |
> |
nazi = PI/2.*nalt + .5; |
539 |
> |
} |
540 |
> |
if (il->sd != NULL) |
541 |
> |
objerror(ob, WARNING, "BSDF ignored"); |
542 |
|
n = nalt*nazi; |
543 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
146 |
< |
if (distarr == NULL) |
147 |
< |
error(SYSTEM, "out of memory in o_sphere"); |
543 |
> |
newdist(n); |
544 |
|
dim[0] = random(); |
545 |
|
/* sample sphere */ |
546 |
|
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
547 |
|
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
548 |
|
for (i = 0; i < il->nsamps; i++) { |
549 |
|
/* next sample point */ |
550 |
< |
peano(sp, 4, urand(ilhash(dim,3)+i), .02); |
550 |
> |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
551 |
|
/* random direction */ |
552 |
|
r1 = (dim[1] + sp[0])/nalt; |
553 |
< |
r2 = (dim[2] + sp[1])/nazi; |
553 |
> |
r2 = (dim[2] + sp[1] - .5)/nazi; |
554 |
|
rounddir(dir, r1, r2); |
555 |
|
/* random location */ |
556 |
|
mkaxes(u, v, dir); /* yuck! */ |
565 |
|
dir[j] = -dir[j]; |
566 |
|
} |
567 |
|
/* send sample */ |
568 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
568 |
> |
raysamp(dim[1]*nazi+dim[2], org, dir); |
569 |
|
} |
570 |
< |
rayflush(rt); |
571 |
< |
/* write out the sphere w/ distribution */ |
572 |
< |
roundout(il, distarr, nalt, nazi); |
573 |
< |
illumout(il, ob); |
570 |
> |
/* wait for all rays to finish */ |
571 |
> |
rayclean(); |
572 |
> |
/* write out the sphere and its distribution */ |
573 |
> |
if (average(il, distarr, n)) { |
574 |
> |
if (il->sampdens > 0) |
575 |
> |
roundout(il, distarr, nalt, nazi); |
576 |
> |
else |
577 |
> |
objerror(ob, WARNING, "diffuse distribution"); |
578 |
> |
illumout(il, ob); |
579 |
> |
} else |
580 |
> |
printobj(il->altmat, ob); |
581 |
|
/* clean up */ |
582 |
< |
free((char *)distarr); |
582 |
> |
return(1); |
583 |
|
} |
584 |
|
|
585 |
|
|
586 |
< |
o_ring(ob, il, rt, nm) /* make an illum ring */ |
587 |
< |
OBJREC *ob; |
588 |
< |
struct illum_args *il; |
589 |
< |
struct rtproc *rt; |
590 |
< |
char *nm; |
586 |
> |
int |
587 |
> |
my_ring( /* make an illum ring */ |
588 |
> |
OBJREC *ob, |
589 |
> |
struct illum_args *il, |
590 |
> |
char *nm |
591 |
> |
) |
592 |
|
{ |
593 |
< |
int dim[3]; |
594 |
< |
int n, nalt, nazi; |
595 |
< |
float *distarr; |
596 |
< |
double sp[4], r1, r2, r3; |
593 |
> |
int dim[2]; |
594 |
> |
int n, nalt, nazi, alti; |
595 |
> |
double sp[2], r1, r2, r3; |
596 |
> |
int h; |
597 |
|
FVECT dn, org, dir; |
598 |
|
FVECT u, v; |
599 |
< |
register CONE *co; |
600 |
< |
register int i, j; |
599 |
> |
MAT4 xfm; |
600 |
> |
CONE *co; |
601 |
> |
int i, j; |
602 |
|
/* get/check arguments */ |
603 |
|
co = getcone(ob, 0); |
604 |
|
/* set up sampling */ |
605 |
< |
n = PI * il->sampdens; |
606 |
< |
nalt = sqrt(n/PI) + .5; |
607 |
< |
nazi = PI*nalt + .5; |
608 |
< |
n = nalt*nazi; |
609 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
610 |
< |
if (distarr == NULL) |
611 |
< |
error(SYSTEM, "out of memory in o_ring"); |
605 |
> |
if (il->sd != NULL) { |
606 |
> |
if (!getBSDF_xfm(xfm, co->ad, il->udir, NULL)) { |
607 |
> |
objerror(ob, WARNING, "illegal up direction"); |
608 |
> |
freecone(ob); |
609 |
> |
return(my_default(ob, il, nm)); |
610 |
> |
} |
611 |
> |
n = il->sd->ninc; |
612 |
> |
} else { |
613 |
> |
if (il->sampdens <= 0) { |
614 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
615 |
> |
} else { |
616 |
> |
n = PI * il->sampdens; |
617 |
> |
nalt = sqrt(n/PI) + .5; |
618 |
> |
nazi = PI*nalt + .5; |
619 |
> |
} |
620 |
> |
n = nazi*nalt; |
621 |
> |
} |
622 |
> |
newdist(n); |
623 |
|
mkaxes(u, v, co->ad); |
624 |
|
dim[0] = random(); |
625 |
|
/* sample disk */ |
626 |
< |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
211 |
< |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
626 |
> |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
627 |
|
for (i = 0; i < il->nsamps; i++) { |
628 |
|
/* next sample point */ |
629 |
< |
peano(sp, 4, urand(ilhash(dim,3)+i), .02); |
630 |
< |
/* random direction */ |
631 |
< |
r1 = (dim[1] + sp[0])/nalt; |
632 |
< |
r2 = (dim[2] + sp[1])/nalt; |
633 |
< |
flatdir(dn, r1, r2); |
634 |
< |
for (j = 0; j < 3; j++) |
635 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
636 |
< |
/* random location */ |
629 |
> |
h = ilhash(dim,2) + i; |
630 |
> |
/* randomize direction */ |
631 |
> |
if (il->sd != NULL) { |
632 |
> |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
633 |
> |
} else { |
634 |
> |
multisamp(sp, 2, urand(h)); |
635 |
> |
alti = dim[1]/nazi; |
636 |
> |
r1 = (alti + sp[0])/nalt; |
637 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
638 |
> |
flatdir(dn, r1, r2); |
639 |
> |
for (j = 0; j < 3; j++) |
640 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
641 |
> |
} |
642 |
> |
/* randomize location */ |
643 |
> |
multisamp(sp, 2, urand(h+8371)); |
644 |
|
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
645 |
< |
sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
646 |
< |
r2 = 2.*PI*sp[3]; |
645 |
> |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
646 |
> |
r2 = 2.*PI*sp[1]; |
647 |
|
r1 = r3*cos(r2); |
648 |
|
r2 = r3*sin(r2); |
649 |
+ |
if (il->sd != NULL && DOT(dir, co->ad) < -FTINY) |
650 |
+ |
r3 = -1.0001*il->thick - 5.*FTINY; |
651 |
+ |
else |
652 |
+ |
r3 = 5.*FTINY; |
653 |
|
for (j = 0; j < 3; j++) |
654 |
< |
org[j] = CO_P0(co)[j] + r1*u[j] + r1*v[j] + |
655 |
< |
.001*co->ad[j]; |
230 |
< |
|
654 |
> |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
655 |
> |
r3*co->ad[j]; |
656 |
|
/* send sample */ |
657 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
657 |
> |
raysamp(dim[1], org, dir); |
658 |
|
} |
659 |
< |
rayflush(rt); |
660 |
< |
/* write out the ring w/ distribution */ |
661 |
< |
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
662 |
< |
illumout(il, ob); |
659 |
> |
/* add in direct component? */ |
660 |
> |
if (il->flags & IL_LIGHT || il->sd != NULL) { |
661 |
> |
MAT4 ixfm; |
662 |
> |
if (il->sd == NULL) { |
663 |
> |
for (i = 3; i--; ) { |
664 |
> |
ixfm[i][0] = u[i]; |
665 |
> |
ixfm[i][1] = v[i]; |
666 |
> |
ixfm[i][2] = co->ad[i]; |
667 |
> |
ixfm[i][3] = 0.; |
668 |
> |
} |
669 |
> |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
670 |
> |
ixfm[3][3] = 1.; |
671 |
> |
} else { |
672 |
> |
if (!invmat4(ixfm, xfm)) |
673 |
> |
objerror(ob, INTERNAL, |
674 |
> |
"cannot invert BSDF transform"); |
675 |
> |
if (!(il->flags & IL_LIGHT)) |
676 |
> |
new_discount(); |
677 |
> |
} |
678 |
> |
dim[0] = random(); |
679 |
> |
for (i = 0; i < il->nsamps; i++) { |
680 |
> |
/* randomize location */ |
681 |
> |
h = dim[0] + samplendx++; |
682 |
> |
multisamp(sp, 2, urand(h)); |
683 |
> |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
684 |
> |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
685 |
> |
r2 = 2.*PI*sp[1]; |
686 |
> |
r1 = r3*cos(r2); |
687 |
> |
r2 = r3*sin(r2); |
688 |
> |
for (j = 0; j < 3; j++) |
689 |
> |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j]; |
690 |
> |
/* sample source rays */ |
691 |
> |
srcsamps(il, org, co->ad, ixfm); |
692 |
> |
} |
693 |
> |
} |
694 |
> |
/* wait for all rays to finish */ |
695 |
> |
rayclean(); |
696 |
> |
if (il->sd != NULL) { /* run distribution through BSDF */ |
697 |
> |
nalt = sqrt(il->sd->nout/PI) + .5; |
698 |
> |
nazi = PI*nalt + .5; |
699 |
> |
redistribute(il->sd, nalt, nazi, u, v, co->ad, xfm); |
700 |
> |
done_discount(); |
701 |
> |
if (!il->sampdens) |
702 |
> |
il->sampdens = nalt*nazi/PI + .999; |
703 |
> |
} |
704 |
> |
/* write out the ring and its distribution */ |
705 |
> |
if (average(il, distarr, n)) { |
706 |
> |
if (il->sampdens > 0) |
707 |
> |
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
708 |
> |
illumout(il, ob); |
709 |
> |
} else |
710 |
> |
printobj(il->altmat, ob); |
711 |
|
/* clean up */ |
712 |
|
freecone(ob); |
713 |
< |
free((char *)distarr); |
713 |
> |
return(1); |
714 |
|
} |
715 |
|
|
716 |
|
|
717 |
< |
raysamp(res, org, dir, rt) /* compute a ray sample */ |
718 |
< |
float res[3]; |
719 |
< |
FVECT org, dir; |
720 |
< |
register struct rtproc *rt; |
717 |
> |
void |
718 |
> |
redistribute( /* pass distarr ray sums through BSDF */ |
719 |
> |
struct BSDF_data *b, |
720 |
> |
int nalt, |
721 |
> |
int nazi, |
722 |
> |
FVECT u, |
723 |
> |
FVECT v, |
724 |
> |
FVECT w, |
725 |
> |
MAT4 xm |
726 |
> |
) |
727 |
|
{ |
728 |
< |
register float *fp; |
729 |
< |
|
730 |
< |
if (rt->nrays == rt->bsiz) |
731 |
< |
rayflush(rt); |
732 |
< |
rt->dest[rt->nrays] = res; |
733 |
< |
fp = rt->buf + 6*rt->nrays++; |
734 |
< |
*fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2]; |
735 |
< |
*fp++ = dir[0]; *fp++ = dir[1]; *fp = dir[2]; |
736 |
< |
} |
737 |
< |
|
738 |
< |
|
739 |
< |
rayflush(rt) /* flush buffered rays */ |
740 |
< |
register struct rtproc *rt; |
741 |
< |
{ |
742 |
< |
register int i; |
743 |
< |
|
744 |
< |
if (rt->nrays <= 0) |
745 |
< |
return; |
746 |
< |
bzero(rt->buf+6*rt->nrays, 6*sizeof(float)); |
747 |
< |
if ( process(rt->pd, (char *)rt->buf, (char *)rt->buf, |
748 |
< |
3*sizeof(float)*rt->nrays, |
270 |
< |
6*sizeof(float)*(rt->nrays+1)) < |
271 |
< |
3*sizeof(float)*rt->nrays ) |
272 |
< |
error(SYSTEM, "error reading from rtrace process"); |
273 |
< |
i = rt->nrays; |
274 |
< |
while (i--) { |
275 |
< |
rt->dest[i][0] += rt->buf[3*i]; |
276 |
< |
rt->dest[i][1] += rt->buf[3*i+1]; |
277 |
< |
rt->dest[i][2] += rt->buf[3*i+2]; |
728 |
> |
int nout = 0; |
729 |
> |
MAT4 mymat, inmat; |
730 |
> |
COLORV *idist; |
731 |
> |
COLORV *cp; |
732 |
> |
FVECT dv; |
733 |
> |
double wt; |
734 |
> |
int i, j, k, c, o; |
735 |
> |
COLOR col, cinc; |
736 |
> |
/* copy incoming distribution */ |
737 |
> |
if (b->ninc > distsiz) |
738 |
> |
error(INTERNAL, "error 1 in redistribute"); |
739 |
> |
idist = (COLORV *)malloc(sizeof(COLOR)*b->ninc); |
740 |
> |
if (idist == NULL) |
741 |
> |
error(SYSTEM, "out of memory in redistribute"); |
742 |
> |
memcpy(idist, distarr, sizeof(COLOR)*b->ninc); |
743 |
> |
/* compose direction transform */ |
744 |
> |
for (i = 3; i--; ) { |
745 |
> |
mymat[i][0] = u[i]; |
746 |
> |
mymat[i][1] = v[i]; |
747 |
> |
mymat[i][2] = w[i]; |
748 |
> |
mymat[i][3] = 0.; |
749 |
|
} |
750 |
< |
rt->nrays = 0; |
751 |
< |
} |
752 |
< |
|
753 |
< |
|
754 |
< |
mkaxes(u, v, n) /* compute u and v to go with n */ |
755 |
< |
FVECT u, v, n; |
756 |
< |
{ |
757 |
< |
register int i; |
758 |
< |
|
759 |
< |
v[0] = v[1] = v[2] = 0.0; |
760 |
< |
for (i = 0; i < 3; i++) |
761 |
< |
if (n[i] < 0.6 && n[i] > -0.6) |
762 |
< |
break; |
763 |
< |
v[i] = 1.0; |
764 |
< |
fcross(u, v, n); |
765 |
< |
normalize(u); |
766 |
< |
fcross(v, n, u); |
767 |
< |
} |
768 |
< |
|
769 |
< |
|
770 |
< |
rounddir(dv, alt, azi) /* compute uniform spherical direction */ |
771 |
< |
register FVECT dv; |
772 |
< |
double alt, azi; |
773 |
< |
{ |
774 |
< |
double d1, d2; |
775 |
< |
|
776 |
< |
dv[2] = 1. - 2.*alt; |
777 |
< |
d1 = sqrt(1. - dv[2]*dv[2]); |
778 |
< |
d2 = 2.*PI * azi; |
779 |
< |
dv[0] = d1*cos(d2); |
780 |
< |
dv[1] = d1*sin(d2); |
781 |
< |
} |
782 |
< |
|
783 |
< |
|
784 |
< |
flatdir(dv, alt, azi) /* compute uniform hemispherical direction */ |
785 |
< |
register FVECT dv; |
786 |
< |
double alt, azi; |
787 |
< |
{ |
788 |
< |
double d1, d2; |
789 |
< |
|
790 |
< |
d1 = sqrt(alt); |
791 |
< |
d2 = 2.*PI * azi; |
792 |
< |
dv[0] = d1*cos(d2); |
793 |
< |
dv[1] = d1*sin(d2); |
794 |
< |
dv[2] = sqrt(1. - alt); |
750 |
> |
mymat[3][0] = mymat[3][1] = mymat[3][2] = 0.; |
751 |
> |
mymat[3][3] = 1.; |
752 |
> |
if (xm != NULL) |
753 |
> |
multmat4(mymat, xm, mymat); |
754 |
> |
for (i = 3; i--; ) { /* make sure it's normalized */ |
755 |
> |
wt = 1./sqrt( mymat[0][i]*mymat[0][i] + |
756 |
> |
mymat[1][i]*mymat[1][i] + |
757 |
> |
mymat[2][i]*mymat[2][i] ); |
758 |
> |
for (j = 3; j--; ) |
759 |
> |
mymat[j][i] *= wt; |
760 |
> |
} |
761 |
> |
if (!invmat4(inmat, mymat)) /* need inverse as well */ |
762 |
> |
error(INTERNAL, "cannot invert BSDF transform"); |
763 |
> |
newdist(nalt*nazi); /* resample distribution */ |
764 |
> |
for (i = b->ninc; i--; ) { |
765 |
> |
int direct_out = -1; |
766 |
> |
COLOR cdir; |
767 |
> |
getBSDF_incvec(dv, b, i); /* compute incident irrad. */ |
768 |
> |
multv3(dv, dv, mymat); |
769 |
> |
if (dv[2] < 0.0) { |
770 |
> |
dv[0] = -dv[0]; dv[1] = -dv[1]; dv[2] = -dv[2]; |
771 |
> |
direct_out += (direct_discount != NULL); |
772 |
> |
} |
773 |
> |
wt = getBSDF_incohm(b, i); |
774 |
> |
wt *= dv[2]; /* solid_angle*cosine(theta) */ |
775 |
> |
cp = &idist[3*i]; |
776 |
> |
copycolor(cinc, cp); |
777 |
> |
scalecolor(cinc, wt); |
778 |
> |
if (!direct_out) { /* discount direct contr. */ |
779 |
> |
cp = &direct_discount[3*i]; |
780 |
> |
copycolor(cdir, cp); |
781 |
> |
scalecolor(cdir, -wt); |
782 |
> |
if (b->nout != b->ninc) |
783 |
> |
direct_out = flatindex(dv, nalt, nazi); |
784 |
> |
else |
785 |
> |
direct_out = i; /* assumes dist. mirroring */ |
786 |
> |
} |
787 |
> |
for (k = nalt; k--; ) /* loop over distribution */ |
788 |
> |
for (j = nazi; j--; ) { |
789 |
> |
int rstart = random(); |
790 |
> |
for (c = NBSDFSAMPS; c--; ) { |
791 |
> |
double sp[2]; |
792 |
> |
multisamp(sp, 2, urand(rstart+c)); |
793 |
> |
flatdir(dv, (k + sp[0])/nalt, |
794 |
> |
(j + .5 - sp[1])/nazi); |
795 |
> |
multv3(dv, dv, inmat); |
796 |
> |
/* evaluate BSDF @ outgoing */ |
797 |
> |
o = getBSDF_outndx(b, dv); |
798 |
> |
if (o < 0) { |
799 |
> |
nout++; |
800 |
> |
continue; |
801 |
> |
} |
802 |
> |
wt = BSDF_value(b, i, o) * (1./NBSDFSAMPS); |
803 |
> |
copycolor(col, cinc); |
804 |
> |
if (b->nout != b->ninc) |
805 |
> |
o = k*nazi + j; |
806 |
> |
if (o == direct_out) |
807 |
> |
addcolor(col, cdir); /* minus direct */ |
808 |
> |
scalecolor(col, wt); |
809 |
> |
cp = &distarr[3*(k*nazi + j)]; |
810 |
> |
addcolor(cp, col); /* sum into distribution */ |
811 |
> |
} |
812 |
> |
} |
813 |
> |
} |
814 |
> |
free(idist); /* free temp space */ |
815 |
> |
if (nout) { |
816 |
> |
sprintf(errmsg, "missing %.1f%% of BSDF directions", |
817 |
> |
100.*nout/(b->ninc*nalt*nazi*NBSDFSAMPS)); |
818 |
> |
error(WARNING, errmsg); |
819 |
> |
} |
820 |
|
} |