| 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 |
< |
int o_default(FUN_ARGLIST); |
| 21 |
< |
int o_face(FUN_ARGLIST); |
| 22 |
< |
int o_sphere(FUN_ARGLIST); |
| 19 |
< |
int o_ring(FUN_ARGLIST); |
| 20 |
< |
void raysamp(float res[3], FVECT org, FVECT dir, struct rtproc *rt); |
| 21 |
< |
void rayflush(struct rtproc *rt); |
| 22 |
< |
void mkaxes(FVECT u, FVECT v, FVECT n); |
| 23 |
< |
void rounddir(FVECT dv, double alt, double azi); |
| 24 |
< |
void flatdir(FVECT dv, double alt, double azi); |
| 20 |
> |
COLORV * distarr = NULL; /* distribution array */ |
| 21 |
> |
int distsiz = 0; |
| 22 |
> |
COLORV * direct_discount = NULL; /* amount to take off direct */ |
| 23 |
|
|
| 24 |
|
|
| 25 |
< |
int /* XXX type conflict with otypes.h */ |
| 26 |
< |
o_default( /* default illum action */ |
| 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, nazi; |
| 127 |
> |
SRCINDEX si; |
| 128 |
> |
RAY sr; |
| 129 |
> |
FVECT v; |
| 130 |
> |
double d; |
| 131 |
> |
int i, j; |
| 132 |
> |
/* get sampling density */ |
| 133 |
> |
if (il->sampdens <= 0) { |
| 134 |
> |
nalt = nazi = 1; |
| 135 |
> |
} else { |
| 136 |
> |
i = PI * il->sampdens; |
| 137 |
> |
nalt = sqrt(i/PI) + .5; |
| 138 |
> |
nazi = PI*nalt + .5; |
| 139 |
> |
} |
| 140 |
> |
initsrcindex(&si); /* loop over (sub)sources */ |
| 141 |
> |
for ( ; ; ) { |
| 142 |
> |
VCOPY(sr.rorg, org); /* pick side to shoot from */ |
| 143 |
> |
if (il->sd != NULL) { |
| 144 |
> |
int sn = si.sn; |
| 145 |
> |
if (si.sp+1 >= si.np) ++sn; |
| 146 |
> |
if (sn >= nsources) break; |
| 147 |
> |
if (source[sn].sflags & SDISTANT) |
| 148 |
> |
d = DOT(source[sn].sloc, nrm); |
| 149 |
> |
else { |
| 150 |
> |
VSUB(v, source[sn].sloc, org); |
| 151 |
> |
d = DOT(v, nrm); |
| 152 |
> |
} |
| 153 |
> |
} else |
| 154 |
> |
d = 1.0; /* only transmission */ |
| 155 |
> |
if (d < 0.0) |
| 156 |
> |
d = -1.0001*il->thick - 5.*FTINY; |
| 157 |
> |
else |
| 158 |
> |
d = 5.*FTINY; |
| 159 |
> |
for (i = 3; i--; ) |
| 160 |
> |
sr.rorg[i] += d*nrm[i]; |
| 161 |
> |
samplendx++; /* increment sample counter */ |
| 162 |
> |
if (!srcray(&sr, NULL, &si)) |
| 163 |
> |
break; /* end of sources */ |
| 164 |
> |
/* index direction */ |
| 165 |
> |
if (ixfm != NULL) |
| 166 |
> |
multv3(v, sr.rdir, ixfm); |
| 167 |
> |
else |
| 168 |
> |
VCOPY(v, sr.rdir); |
| 169 |
> |
if (il->sd != NULL) { |
| 170 |
> |
i = getBSDF_incndx(il->sd, v); |
| 171 |
> |
if (i < 0) |
| 172 |
> |
continue; /* must not be important */ |
| 173 |
> |
sr.rno = i; |
| 174 |
> |
d = 1.0/getBSDF_incohm(il->sd, i); |
| 175 |
> |
} else { |
| 176 |
> |
if (v[2] >= -FTINY) |
| 177 |
> |
continue; /* only sample transmission */ |
| 178 |
> |
v[0] = -v[0]; v[1] = -v[1]; v[2] = -v[2]; |
| 179 |
> |
sr.rno = flatindex(v, nalt, nazi); |
| 180 |
> |
d = nalt*nazi*(1./PI) * v[2]; |
| 181 |
> |
} |
| 182 |
> |
d *= si.dom; /* solid angle correction */ |
| 183 |
> |
scalecolor(sr.rcoef, d); |
| 184 |
> |
process_ray(&sr, ray_pqueue(&sr)); |
| 185 |
> |
} |
| 186 |
> |
} |
| 187 |
> |
|
| 188 |
> |
|
| 189 |
> |
void |
| 190 |
> |
rayclean() /* finish all pending rays */ |
| 191 |
> |
{ |
| 192 |
> |
RAY myRay; |
| 193 |
> |
|
| 194 |
> |
while (process_ray(&myRay, ray_presult(&myRay, 0))) |
| 195 |
> |
; |
| 196 |
> |
} |
| 197 |
> |
|
| 198 |
> |
|
| 199 |
> |
static void |
| 200 |
> |
mkaxes( /* compute u and v to go with n */ |
| 201 |
> |
FVECT u, |
| 202 |
> |
FVECT v, |
| 203 |
> |
FVECT n |
| 204 |
> |
) |
| 205 |
> |
{ |
| 206 |
> |
register int i; |
| 207 |
> |
|
| 208 |
> |
v[0] = v[1] = v[2] = 0.0; |
| 209 |
> |
for (i = 0; i < 3; i++) |
| 210 |
> |
if (n[i] < 0.6 && n[i] > -0.6) |
| 211 |
> |
break; |
| 212 |
> |
v[i] = 1.0; |
| 213 |
> |
fcross(u, v, n); |
| 214 |
> |
normalize(u); |
| 215 |
> |
fcross(v, n, u); |
| 216 |
> |
} |
| 217 |
> |
|
| 218 |
> |
|
| 219 |
> |
static void |
| 220 |
> |
rounddir( /* compute uniform spherical direction */ |
| 221 |
> |
register FVECT dv, |
| 222 |
> |
double alt, |
| 223 |
> |
double azi |
| 224 |
> |
) |
| 225 |
> |
{ |
| 226 |
> |
double d1, d2; |
| 227 |
> |
|
| 228 |
> |
dv[2] = 1. - 2.*alt; |
| 229 |
> |
d1 = sqrt(1. - dv[2]*dv[2]); |
| 230 |
> |
d2 = 2.*PI * azi; |
| 231 |
> |
dv[0] = d1*cos(d2); |
| 232 |
> |
dv[1] = d1*sin(d2); |
| 233 |
> |
} |
| 234 |
> |
|
| 235 |
> |
|
| 236 |
> |
void |
| 237 |
> |
flatdir( /* compute uniform hemispherical direction */ |
| 238 |
> |
FVECT dv, |
| 239 |
> |
double alt, |
| 240 |
> |
double azi |
| 241 |
> |
) |
| 242 |
> |
{ |
| 243 |
> |
double d1, d2; |
| 244 |
> |
|
| 245 |
> |
d1 = sqrt(alt); |
| 246 |
> |
d2 = 2.*PI * azi; |
| 247 |
> |
dv[0] = d1*cos(d2); |
| 248 |
> |
dv[1] = d1*sin(d2); |
| 249 |
> |
dv[2] = sqrt(1. - alt); |
| 250 |
> |
} |
| 251 |
> |
|
| 252 |
> |
|
| 253 |
> |
int |
| 254 |
> |
flatindex( /* compute index for hemispherical direction */ |
| 255 |
> |
FVECT dv, |
| 256 |
> |
int nalt, |
| 257 |
> |
int nazi |
| 258 |
> |
) |
| 259 |
> |
{ |
| 260 |
> |
double d; |
| 261 |
> |
int i, j; |
| 262 |
> |
|
| 263 |
> |
d = 1.0 - dv[2]*dv[2]; |
| 264 |
> |
i = d*nalt; |
| 265 |
> |
d = atan2(dv[1], dv[0]) * (0.5/PI); |
| 266 |
> |
if (d < 0.0) d += 1.0; |
| 267 |
> |
j = d*nazi + 0.5; |
| 268 |
> |
if (j >= nazi) j = 0; |
| 269 |
> |
return(i*nazi + j); |
| 270 |
> |
} |
| 271 |
> |
|
| 272 |
> |
|
| 273 |
> |
int |
| 274 |
> |
printgeom( /* print out detailed geometry for BSDF */ |
| 275 |
> |
struct BSDF_data *sd, |
| 276 |
> |
char *xfrot, |
| 277 |
> |
FVECT ctr, |
| 278 |
> |
double s1, |
| 279 |
> |
double s2 |
| 280 |
> |
) |
| 281 |
> |
{ |
| 282 |
> |
static char mgftemp[] = TEMPLATE; |
| 283 |
> |
char cmdbuf[64]; |
| 284 |
> |
FILE *fp; |
| 285 |
> |
double sca; |
| 286 |
> |
|
| 287 |
> |
if (sd == NULL || sd->mgf == NULL) |
| 288 |
> |
return(0); |
| 289 |
> |
if (sd->dim[0] <= FTINY || sd->dim[1] <= FTINY) |
| 290 |
> |
return(0); |
| 291 |
> |
if ((s1 > s2) ^ (sd->dim[0] > sd->dim[1])) { |
| 292 |
> |
sca = s1; s1 = s2; s2 = sca; |
| 293 |
> |
} |
| 294 |
> |
s1 /= sd->dim[0]; |
| 295 |
> |
s2 /= sd->dim[1]; |
| 296 |
> |
sca = s1 > s2 ? s1 : s2; |
| 297 |
> |
strcpy(mgftemp, TEMPLATE); |
| 298 |
> |
if ((fp = fopen(mktemp(mgftemp), "w")) == NULL) |
| 299 |
> |
error(SYSTEM, "cannot create temporary file for MGF"); |
| 300 |
> |
/* prepend our transform */ |
| 301 |
> |
fprintf(fp, "xf%s -s %.5f -t %.5g %.5g %.5g\n", |
| 302 |
> |
xfrot, sca, ctr[0], ctr[1], ctr[2]); |
| 303 |
> |
/* output given MGF description */ |
| 304 |
> |
fputs(sd->mgf, fp); |
| 305 |
> |
fputs("\nxf\n", fp); |
| 306 |
> |
if (fclose(fp) == EOF) |
| 307 |
> |
error(SYSTEM, "error writing MGF temporary file"); |
| 308 |
> |
/* execute mgf2rad to convert MGF */ |
| 309 |
> |
strcpy(cmdbuf, "mgf2rad "); |
| 310 |
> |
strcpy(cmdbuf+8, mgftemp); |
| 311 |
> |
fflush(stdout); |
| 312 |
> |
system(cmdbuf); |
| 313 |
> |
unlink(mgftemp); /* clean up */ |
| 314 |
> |
return(1); |
| 315 |
> |
} |
| 316 |
> |
|
| 317 |
> |
|
| 318 |
> |
int |
| 319 |
> |
my_default( /* default illum action */ |
| 320 |
|
OBJREC *ob, |
| 321 |
|
struct illum_args *il, |
| 31 |
– |
struct rtproc *rt, |
| 322 |
|
char *nm |
| 323 |
|
) |
| 324 |
|
{ |
| 331 |
|
|
| 332 |
|
|
| 333 |
|
int |
| 334 |
< |
o_face( /* make an illum face */ |
| 334 |
> |
my_face( /* make an illum face */ |
| 335 |
|
OBJREC *ob, |
| 336 |
|
struct illum_args *il, |
| 47 |
– |
struct rtproc *rt, |
| 337 |
|
char *nm |
| 338 |
|
) |
| 339 |
|
{ |
| 340 |
< |
#define MAXMISS (5*n*il->nsamps) |
| 341 |
< |
int dim[3]; |
| 53 |
< |
int n, nalt, nazi, h; |
| 54 |
< |
float *distarr; |
| 340 |
> |
int dim[2]; |
| 341 |
> |
int n, nalt, nazi, alti; |
| 342 |
|
double sp[2], r1, r2; |
| 343 |
+ |
int h; |
| 344 |
|
FVECT dn, org, dir; |
| 345 |
|
FVECT u, v; |
| 346 |
|
double ur[2], vr[2]; |
| 347 |
< |
int nmisses; |
| 348 |
< |
register FACE *fa; |
| 349 |
< |
register int i, j; |
| 347 |
> |
MAT4 xfm; |
| 348 |
> |
char xfrot[64]; |
| 349 |
> |
int nallow; |
| 350 |
> |
FACE *fa; |
| 351 |
> |
int i, j; |
| 352 |
|
/* get/check arguments */ |
| 353 |
|
fa = getface(ob); |
| 354 |
|
if (fa->area == 0.0) { |
| 355 |
|
freeface(ob); |
| 356 |
< |
return(o_default(ob, il, rt, nm)); |
| 356 |
> |
return(my_default(ob, il, nm)); |
| 357 |
|
} |
| 358 |
|
/* set up sampling */ |
| 359 |
< |
if (il->sampdens <= 0) |
| 360 |
< |
nalt = nazi = 1; |
| 361 |
< |
else { |
| 362 |
< |
n = PI * il->sampdens; |
| 363 |
< |
nalt = sqrt(n/PI) + .5; |
| 364 |
< |
nazi = PI*nalt + .5; |
| 359 |
> |
if (il->sd != NULL) { |
| 360 |
> |
if (!getBSDF_xfm(xfm, fa->norm, il->udir, xfrot)) { |
| 361 |
> |
objerror(ob, WARNING, "illegal up direction"); |
| 362 |
> |
freeface(ob); |
| 363 |
> |
return(my_default(ob, il, nm)); |
| 364 |
> |
} |
| 365 |
> |
n = il->sd->ninc; |
| 366 |
> |
} else { |
| 367 |
> |
if (il->sampdens <= 0) { |
| 368 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
| 369 |
> |
} else { |
| 370 |
> |
n = PI * il->sampdens; |
| 371 |
> |
nalt = sqrt(n/PI) + .5; |
| 372 |
> |
nazi = PI*nalt + .5; |
| 373 |
> |
} |
| 374 |
> |
n = nazi*nalt; |
| 375 |
|
} |
| 376 |
< |
n = nalt*nazi; |
| 377 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
| 78 |
< |
if (distarr == NULL) |
| 79 |
< |
error(SYSTEM, "out of memory in o_face"); |
| 80 |
< |
/* take first edge longer than sqrt(area) */ |
| 376 |
> |
newdist(n); |
| 377 |
> |
/* take first edge >= sqrt(area) */ |
| 378 |
|
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
| 379 |
|
u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0]; |
| 380 |
|
u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1]; |
| 399 |
|
if (r2 < vr[0]) vr[0] = r2; |
| 400 |
|
if (r2 > vr[1]) vr[1] = r2; |
| 401 |
|
} |
| 402 |
+ |
/* output detailed geometry? */ |
| 403 |
+ |
if (!(il->flags & IL_LIGHT) && il->sd != NULL && il->sd->mgf != NULL && |
| 404 |
+ |
il->thick <= FTINY) { |
| 405 |
+ |
for (j = 3; j--; ) |
| 406 |
+ |
org[j] = .5*(ur[0]+ur[1])*u[j] + |
| 407 |
+ |
.5*(vr[0]+vr[1])*v[j] + |
| 408 |
+ |
fa->offset*fa->norm[j]; |
| 409 |
+ |
printgeom(il->sd, xfrot, org, ur[1]-ur[0], vr[1]-vr[0]); |
| 410 |
+ |
} |
| 411 |
|
dim[0] = random(); |
| 412 |
|
/* sample polygon */ |
| 413 |
< |
nmisses = 0; |
| 414 |
< |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
| 109 |
< |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
| 413 |
> |
nallow = 5*n*il->nsamps; |
| 414 |
> |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
| 415 |
|
for (i = 0; i < il->nsamps; i++) { |
| 416 |
< |
/* random direction */ |
| 417 |
< |
h = ilhash(dim, 3) + i; |
| 418 |
< |
multisamp(sp, 2, urand(h)); |
| 419 |
< |
r1 = (dim[1] + sp[0])/nalt; |
| 420 |
< |
r2 = (dim[2] + sp[1] - .5)/nazi; |
| 421 |
< |
flatdir(dn, r1, r2); |
| 422 |
< |
for (j = 0; j < 3; j++) |
| 423 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
| 424 |
< |
/* random location */ |
| 416 |
> |
/* randomize direction */ |
| 417 |
> |
h = ilhash(dim, 2) + i; |
| 418 |
> |
if (il->sd != NULL) { |
| 419 |
> |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
| 420 |
> |
} else { |
| 421 |
> |
multisamp(sp, 2, urand(h)); |
| 422 |
> |
alti = dim[1]/nazi; |
| 423 |
> |
r1 = (alti + sp[0])/nalt; |
| 424 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
| 425 |
> |
flatdir(dn, r1, r2); |
| 426 |
> |
for (j = 0; j < 3; j++) |
| 427 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - |
| 428 |
> |
dn[2]*fa->norm[j]; |
| 429 |
> |
} |
| 430 |
> |
/* randomize location */ |
| 431 |
|
do { |
| 432 |
< |
multisamp(sp, 2, urand(h+4862+nmisses)); |
| 432 |
> |
multisamp(sp, 2, urand(h+4862+nallow)); |
| 433 |
|
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
| 434 |
|
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
| 435 |
|
for (j = 0; j < 3; j++) |
| 436 |
|
org[j] = r1*u[j] + r2*v[j] |
| 437 |
|
+ fa->offset*fa->norm[j]; |
| 438 |
< |
} while (!inface(org, fa) && nmisses++ < MAXMISS); |
| 439 |
< |
if (nmisses > MAXMISS) { |
| 438 |
> |
} while (!inface(org, fa) && nallow-- > 0); |
| 439 |
> |
if (nallow < 0) { |
| 440 |
|
objerror(ob, WARNING, "bad aspect"); |
| 441 |
< |
rt->nrays = 0; |
| 441 |
> |
rayclean(); |
| 442 |
|
freeface(ob); |
| 443 |
< |
free((void *)distarr); |
| 133 |
< |
return(o_default(ob, il, rt, nm)); |
| 443 |
> |
return(my_default(ob, il, nm)); |
| 444 |
|
} |
| 445 |
+ |
if (il->sd != NULL && DOT(dir, fa->norm) < -FTINY) |
| 446 |
+ |
r1 = -1.0001*il->thick - 5.*FTINY; |
| 447 |
+ |
else |
| 448 |
+ |
r1 = 5.*FTINY; |
| 449 |
|
for (j = 0; j < 3; j++) |
| 450 |
< |
org[j] += .001*fa->norm[j]; |
| 450 |
> |
org[j] += r1*fa->norm[j]; |
| 451 |
|
/* send sample */ |
| 452 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
| 452 |
> |
raysamp(dim[1], org, dir); |
| 453 |
|
} |
| 454 |
< |
rayflush(rt); |
| 454 |
> |
/* add in direct component? */ |
| 455 |
> |
if (il->flags & IL_LIGHT || il->sd != NULL) { |
| 456 |
> |
MAT4 ixfm; |
| 457 |
> |
if (il->sd == NULL) { |
| 458 |
> |
for (i = 3; i--; ) { |
| 459 |
> |
ixfm[i][0] = u[i]; |
| 460 |
> |
ixfm[i][1] = v[i]; |
| 461 |
> |
ixfm[i][2] = fa->norm[i]; |
| 462 |
> |
ixfm[i][3] = 0.; |
| 463 |
> |
} |
| 464 |
> |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
| 465 |
> |
ixfm[3][3] = 1.; |
| 466 |
> |
} else { |
| 467 |
> |
if (!invmat4(ixfm, xfm)) |
| 468 |
> |
objerror(ob, INTERNAL, |
| 469 |
> |
"cannot invert BSDF transform"); |
| 470 |
> |
if (!(il->flags & IL_LIGHT)) |
| 471 |
> |
new_discount(); |
| 472 |
> |
} |
| 473 |
> |
dim[0] = random(); |
| 474 |
> |
nallow = 10*il->nsamps; |
| 475 |
> |
for (i = 0; i < il->nsamps; i++) { |
| 476 |
> |
/* randomize location */ |
| 477 |
> |
h = dim[0] + samplendx++; |
| 478 |
> |
do { |
| 479 |
> |
multisamp(sp, 2, urand(h+nallow)); |
| 480 |
> |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
| 481 |
> |
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
| 482 |
> |
for (j = 0; j < 3; j++) |
| 483 |
> |
org[j] = r1*u[j] + r2*v[j] |
| 484 |
> |
+ fa->offset*fa->norm[j]; |
| 485 |
> |
} while (!inface(org, fa) && nallow-- > 0); |
| 486 |
> |
if (nallow < 0) { |
| 487 |
> |
objerror(ob, WARNING, "bad aspect"); |
| 488 |
> |
rayclean(); |
| 489 |
> |
freeface(ob); |
| 490 |
> |
return(my_default(ob, il, nm)); |
| 491 |
> |
} |
| 492 |
> |
/* sample source rays */ |
| 493 |
> |
srcsamps(il, org, fa->norm, ixfm); |
| 494 |
> |
} |
| 495 |
> |
} |
| 496 |
> |
/* wait for all rays to finish */ |
| 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, fa->norm, xfm); |
| 502 |
> |
done_discount(); |
| 503 |
> |
if (!il->sampdens) |
| 504 |
> |
il->sampdens = nalt*nazi/PI + .999; |
| 505 |
> |
} |
| 506 |
|
/* write out the face and its distribution */ |
| 507 |
< |
if (average(il, distarr, nalt*nazi)) { |
| 507 |
> |
if (average(il, distarr, n)) { |
| 508 |
|
if (il->sampdens > 0) |
| 509 |
|
flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
| 510 |
|
illumout(il, ob); |
| 512 |
|
printobj(il->altmat, ob); |
| 513 |
|
/* clean up */ |
| 514 |
|
freeface(ob); |
| 150 |
– |
free((void *)distarr); |
| 515 |
|
return(0); |
| 152 |
– |
#undef MAXMISS |
| 516 |
|
} |
| 517 |
|
|
| 518 |
|
|
| 519 |
|
int |
| 520 |
< |
o_sphere( /* make an illum sphere */ |
| 520 |
> |
my_sphere( /* make an illum sphere */ |
| 521 |
|
register OBJREC *ob, |
| 522 |
|
struct illum_args *il, |
| 160 |
– |
struct rtproc *rt, |
| 523 |
|
char *nm |
| 524 |
|
) |
| 525 |
|
{ |
| 526 |
|
int dim[3]; |
| 527 |
|
int n, nalt, nazi; |
| 166 |
– |
float *distarr; |
| 528 |
|
double sp[4], r1, r2, r3; |
| 529 |
|
FVECT org, dir; |
| 530 |
|
FVECT u, v; |
| 540 |
|
nalt = sqrt(2./PI*n) + .5; |
| 541 |
|
nazi = PI/2.*nalt + .5; |
| 542 |
|
} |
| 543 |
+ |
if (il->sd != NULL) |
| 544 |
+ |
objerror(ob, WARNING, "BSDF ignored"); |
| 545 |
|
n = nalt*nazi; |
| 546 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
| 184 |
< |
if (distarr == NULL) |
| 185 |
< |
error(SYSTEM, "out of memory in o_sphere"); |
| 546 |
> |
newdist(n); |
| 547 |
|
dim[0] = random(); |
| 548 |
|
/* sample sphere */ |
| 549 |
|
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
| 568 |
|
dir[j] = -dir[j]; |
| 569 |
|
} |
| 570 |
|
/* send sample */ |
| 571 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
| 571 |
> |
raysamp(dim[1]*nazi+dim[2], org, dir); |
| 572 |
|
} |
| 573 |
< |
rayflush(rt); |
| 573 |
> |
/* wait for all rays to finish */ |
| 574 |
> |
rayclean(); |
| 575 |
|
/* write out the sphere and its distribution */ |
| 576 |
< |
if (average(il, distarr, nalt*nazi)) { |
| 576 |
> |
if (average(il, distarr, n)) { |
| 577 |
|
if (il->sampdens > 0) |
| 578 |
|
roundout(il, distarr, nalt, nazi); |
| 579 |
|
else |
| 582 |
|
} else |
| 583 |
|
printobj(il->altmat, ob); |
| 584 |
|
/* clean up */ |
| 223 |
– |
free((void *)distarr); |
| 585 |
|
return(1); |
| 586 |
|
} |
| 587 |
|
|
| 588 |
|
|
| 589 |
|
int |
| 590 |
< |
o_ring( /* make an illum ring */ |
| 590 |
> |
my_ring( /* make an illum ring */ |
| 591 |
|
OBJREC *ob, |
| 592 |
|
struct illum_args *il, |
| 232 |
– |
struct rtproc *rt, |
| 593 |
|
char *nm |
| 594 |
|
) |
| 595 |
|
{ |
| 596 |
< |
int dim[3]; |
| 597 |
< |
int n, nalt, nazi; |
| 598 |
< |
float *distarr; |
| 599 |
< |
double sp[4], r1, r2, r3; |
| 596 |
> |
int dim[2]; |
| 597 |
> |
int n, nalt, nazi, alti; |
| 598 |
> |
double sp[2], r1, r2, r3; |
| 599 |
> |
int h; |
| 600 |
|
FVECT dn, org, dir; |
| 601 |
|
FVECT u, v; |
| 602 |
< |
register CONE *co; |
| 603 |
< |
register int i, j; |
| 602 |
> |
MAT4 xfm; |
| 603 |
> |
CONE *co; |
| 604 |
> |
int i, j; |
| 605 |
|
/* get/check arguments */ |
| 606 |
|
co = getcone(ob, 0); |
| 607 |
|
/* set up sampling */ |
| 608 |
< |
if (il->sampdens <= 0) |
| 609 |
< |
nalt = nazi = 1; |
| 610 |
< |
else { |
| 611 |
< |
n = PI * il->sampdens; |
| 612 |
< |
nalt = sqrt(n/PI) + .5; |
| 613 |
< |
nazi = PI*nalt + .5; |
| 608 |
> |
if (il->sd != NULL) { |
| 609 |
> |
if (!getBSDF_xfm(xfm, co->ad, il->udir, NULL)) { |
| 610 |
> |
objerror(ob, WARNING, "illegal up direction"); |
| 611 |
> |
freecone(ob); |
| 612 |
> |
return(my_default(ob, il, nm)); |
| 613 |
> |
} |
| 614 |
> |
n = il->sd->ninc; |
| 615 |
> |
} else { |
| 616 |
> |
if (il->sampdens <= 0) { |
| 617 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
| 618 |
> |
} else { |
| 619 |
> |
n = PI * il->sampdens; |
| 620 |
> |
nalt = sqrt(n/PI) + .5; |
| 621 |
> |
nazi = PI*nalt + .5; |
| 622 |
> |
} |
| 623 |
> |
n = nazi*nalt; |
| 624 |
|
} |
| 625 |
< |
n = nalt*nazi; |
| 255 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
| 256 |
< |
if (distarr == NULL) |
| 257 |
< |
error(SYSTEM, "out of memory in o_ring"); |
| 625 |
> |
newdist(n); |
| 626 |
|
mkaxes(u, v, co->ad); |
| 627 |
|
dim[0] = random(); |
| 628 |
|
/* sample disk */ |
| 629 |
< |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
| 262 |
< |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
| 629 |
> |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
| 630 |
|
for (i = 0; i < il->nsamps; i++) { |
| 631 |
|
/* next sample point */ |
| 632 |
< |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
| 633 |
< |
/* random direction */ |
| 634 |
< |
r1 = (dim[1] + sp[0])/nalt; |
| 635 |
< |
r2 = (dim[2] + sp[1] - .5)/nazi; |
| 636 |
< |
flatdir(dn, r1, r2); |
| 637 |
< |
for (j = 0; j < 3; j++) |
| 638 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
| 639 |
< |
/* random location */ |
| 632 |
> |
h = ilhash(dim,2) + i; |
| 633 |
> |
/* randomize direction */ |
| 634 |
> |
if (il->sd != NULL) { |
| 635 |
> |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
| 636 |
> |
} else { |
| 637 |
> |
multisamp(sp, 2, urand(h)); |
| 638 |
> |
alti = dim[1]/nazi; |
| 639 |
> |
r1 = (alti + sp[0])/nalt; |
| 640 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
| 641 |
> |
flatdir(dn, r1, r2); |
| 642 |
> |
for (j = 0; j < 3; j++) |
| 643 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
| 644 |
> |
} |
| 645 |
> |
/* randomize location */ |
| 646 |
> |
multisamp(sp, 2, urand(h+8371)); |
| 647 |
|
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
| 648 |
< |
sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
| 649 |
< |
r2 = 2.*PI*sp[3]; |
| 648 |
> |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
| 649 |
> |
r2 = 2.*PI*sp[1]; |
| 650 |
|
r1 = r3*cos(r2); |
| 651 |
|
r2 = r3*sin(r2); |
| 652 |
+ |
if (il->sd != NULL && DOT(dir, co->ad) < -FTINY) |
| 653 |
+ |
r3 = -1.0001*il->thick - 5.*FTINY; |
| 654 |
+ |
else |
| 655 |
+ |
r3 = 5.*FTINY; |
| 656 |
|
for (j = 0; j < 3; j++) |
| 657 |
|
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
| 658 |
< |
.001*co->ad[j]; |
| 281 |
< |
|
| 658 |
> |
r3*co->ad[j]; |
| 659 |
|
/* send sample */ |
| 660 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
| 660 |
> |
raysamp(dim[1], org, dir); |
| 661 |
|
} |
| 662 |
< |
rayflush(rt); |
| 662 |
> |
/* add in direct component? */ |
| 663 |
> |
if (il->flags & IL_LIGHT || il->sd != NULL) { |
| 664 |
> |
MAT4 ixfm; |
| 665 |
> |
if (il->sd == NULL) { |
| 666 |
> |
for (i = 3; i--; ) { |
| 667 |
> |
ixfm[i][0] = u[i]; |
| 668 |
> |
ixfm[i][1] = v[i]; |
| 669 |
> |
ixfm[i][2] = co->ad[i]; |
| 670 |
> |
ixfm[i][3] = 0.; |
| 671 |
> |
} |
| 672 |
> |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
| 673 |
> |
ixfm[3][3] = 1.; |
| 674 |
> |
} else { |
| 675 |
> |
if (!invmat4(ixfm, xfm)) |
| 676 |
> |
objerror(ob, INTERNAL, |
| 677 |
> |
"cannot invert BSDF transform"); |
| 678 |
> |
if (!(il->flags & IL_LIGHT)) |
| 679 |
> |
new_discount(); |
| 680 |
> |
} |
| 681 |
> |
dim[0] = random(); |
| 682 |
> |
for (i = 0; i < il->nsamps; i++) { |
| 683 |
> |
/* randomize location */ |
| 684 |
> |
h = dim[0] + samplendx++; |
| 685 |
> |
multisamp(sp, 2, urand(h)); |
| 686 |
> |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
| 687 |
> |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
| 688 |
> |
r2 = 2.*PI*sp[1]; |
| 689 |
> |
r1 = r3*cos(r2); |
| 690 |
> |
r2 = r3*sin(r2); |
| 691 |
> |
for (j = 0; j < 3; j++) |
| 692 |
> |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j]; |
| 693 |
> |
/* sample source rays */ |
| 694 |
> |
srcsamps(il, org, co->ad, ixfm); |
| 695 |
> |
} |
| 696 |
> |
} |
| 697 |
> |
/* wait for all rays to finish */ |
| 698 |
> |
rayclean(); |
| 699 |
> |
if (il->sd != NULL) { /* run distribution through BSDF */ |
| 700 |
> |
nalt = sqrt(il->sd->nout/PI) + .5; |
| 701 |
> |
nazi = PI*nalt + .5; |
| 702 |
> |
redistribute(il->sd, nalt, nazi, u, v, co->ad, xfm); |
| 703 |
> |
done_discount(); |
| 704 |
> |
if (!il->sampdens) |
| 705 |
> |
il->sampdens = nalt*nazi/PI + .999; |
| 706 |
> |
} |
| 707 |
|
/* write out the ring and its distribution */ |
| 708 |
< |
if (average(il, distarr, nalt*nazi)) { |
| 708 |
> |
if (average(il, distarr, n)) { |
| 709 |
|
if (il->sampdens > 0) |
| 710 |
|
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
| 711 |
|
illumout(il, ob); |
| 713 |
|
printobj(il->altmat, ob); |
| 714 |
|
/* clean up */ |
| 715 |
|
freecone(ob); |
| 295 |
– |
free((void *)distarr); |
| 716 |
|
return(1); |
| 717 |
|
} |
| 718 |
|
|
| 719 |
|
|
| 720 |
|
void |
| 721 |
< |
raysamp( /* compute a ray sample */ |
| 722 |
< |
float res[3], |
| 723 |
< |
FVECT org, |
| 724 |
< |
FVECT dir, |
| 725 |
< |
register struct rtproc *rt |
| 721 |
> |
redistribute( /* pass distarr ray sums through BSDF */ |
| 722 |
> |
struct BSDF_data *b, |
| 723 |
> |
int nalt, |
| 724 |
> |
int nazi, |
| 725 |
> |
FVECT u, |
| 726 |
> |
FVECT v, |
| 727 |
> |
FVECT w, |
| 728 |
> |
MAT4 xm |
| 729 |
|
) |
| 730 |
|
{ |
| 731 |
< |
register float *fp; |
| 732 |
< |
|
| 733 |
< |
if (rt->nrays == rt->bsiz) |
| 734 |
< |
rayflush(rt); |
| 735 |
< |
rt->dest[rt->nrays] = res; |
| 736 |
< |
fp = rt->buf + 6*rt->nrays++; |
| 737 |
< |
*fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2]; |
| 738 |
< |
*fp++ = dir[0]; *fp++ = dir[1]; *fp = dir[2]; |
| 739 |
< |
} |
| 740 |
< |
|
| 741 |
< |
|
| 742 |
< |
void |
| 743 |
< |
rayflush( /* flush buffered rays */ |
| 744 |
< |
register struct rtproc *rt |
| 745 |
< |
) |
| 746 |
< |
{ |
| 747 |
< |
register int i; |
| 748 |
< |
|
| 749 |
< |
if (rt->nrays <= 0) |
| 750 |
< |
return; |
| 751 |
< |
memset(rt->buf+6*rt->nrays, '\0', 6*sizeof(float)); |
| 329 |
< |
errno = 0; |
| 330 |
< |
if ( process(&(rt->pd), (char *)rt->buf, (char *)rt->buf, |
| 331 |
< |
3*sizeof(float)*(rt->nrays+1), |
| 332 |
< |
6*sizeof(float)*(rt->nrays+1)) < |
| 333 |
< |
3*sizeof(float)*(rt->nrays+1) ) |
| 334 |
< |
error(SYSTEM, "error reading from rtrace process"); |
| 335 |
< |
i = rt->nrays; |
| 336 |
< |
while (i--) { |
| 337 |
< |
rt->dest[i][0] += rt->buf[3*i]; |
| 338 |
< |
rt->dest[i][1] += rt->buf[3*i+1]; |
| 339 |
< |
rt->dest[i][2] += rt->buf[3*i+2]; |
| 731 |
> |
int nout = 0; |
| 732 |
> |
MAT4 mymat, inmat; |
| 733 |
> |
COLORV *idist; |
| 734 |
> |
COLORV *cp; |
| 735 |
> |
FVECT dv; |
| 736 |
> |
double wt; |
| 737 |
> |
int i, j, k, c, o; |
| 738 |
> |
COLOR col, cinc; |
| 739 |
> |
/* copy incoming distribution */ |
| 740 |
> |
if (b->ninc > distsiz) |
| 741 |
> |
error(INTERNAL, "error 1 in redistribute"); |
| 742 |
> |
idist = (COLORV *)malloc(sizeof(COLOR)*b->ninc); |
| 743 |
> |
if (idist == NULL) |
| 744 |
> |
error(SYSTEM, "out of memory in redistribute"); |
| 745 |
> |
memcpy(idist, distarr, sizeof(COLOR)*b->ninc); |
| 746 |
> |
/* compose direction transform */ |
| 747 |
> |
for (i = 3; i--; ) { |
| 748 |
> |
mymat[i][0] = u[i]; |
| 749 |
> |
mymat[i][1] = v[i]; |
| 750 |
> |
mymat[i][2] = w[i]; |
| 751 |
> |
mymat[i][3] = 0.; |
| 752 |
|
} |
| 753 |
< |
rt->nrays = 0; |
| 754 |
< |
} |
| 755 |
< |
|
| 756 |
< |
|
| 757 |
< |
void |
| 758 |
< |
mkaxes( /* compute u and v to go with n */ |
| 759 |
< |
FVECT u, |
| 760 |
< |
FVECT v, |
| 761 |
< |
FVECT n |
| 762 |
< |
) |
| 763 |
< |
{ |
| 764 |
< |
register int i; |
| 765 |
< |
|
| 766 |
< |
v[0] = v[1] = v[2] = 0.0; |
| 767 |
< |
for (i = 0; i < 3; i++) |
| 768 |
< |
if (n[i] < 0.6 && n[i] > -0.6) |
| 769 |
< |
break; |
| 770 |
< |
v[i] = 1.0; |
| 771 |
< |
fcross(u, v, n); |
| 772 |
< |
normalize(u); |
| 773 |
< |
fcross(v, n, u); |
| 774 |
< |
} |
| 775 |
< |
|
| 776 |
< |
|
| 777 |
< |
void |
| 778 |
< |
rounddir( /* compute uniform spherical direction */ |
| 779 |
< |
register FVECT dv, |
| 780 |
< |
double alt, |
| 781 |
< |
double azi |
| 782 |
< |
) |
| 783 |
< |
{ |
| 784 |
< |
double d1, d2; |
| 785 |
< |
|
| 786 |
< |
dv[2] = 1. - 2.*alt; |
| 787 |
< |
d1 = sqrt(1. - dv[2]*dv[2]); |
| 788 |
< |
d2 = 2.*PI * azi; |
| 789 |
< |
dv[0] = d1*cos(d2); |
| 790 |
< |
dv[1] = d1*sin(d2); |
| 791 |
< |
} |
| 792 |
< |
|
| 793 |
< |
|
| 794 |
< |
void |
| 795 |
< |
flatdir( /* compute uniform hemispherical direction */ |
| 796 |
< |
register FVECT dv, |
| 797 |
< |
double alt, |
| 798 |
< |
double azi |
| 799 |
< |
) |
| 800 |
< |
{ |
| 801 |
< |
double d1, d2; |
| 802 |
< |
|
| 803 |
< |
d1 = sqrt(alt); |
| 804 |
< |
d2 = 2.*PI * azi; |
| 805 |
< |
dv[0] = d1*cos(d2); |
| 806 |
< |
dv[1] = d1*sin(d2); |
| 807 |
< |
dv[2] = sqrt(1. - alt); |
| 753 |
> |
mymat[3][0] = mymat[3][1] = mymat[3][2] = 0.; |
| 754 |
> |
mymat[3][3] = 1.; |
| 755 |
> |
if (xm != NULL) |
| 756 |
> |
multmat4(mymat, xm, mymat); |
| 757 |
> |
for (i = 3; i--; ) { /* make sure it's normalized */ |
| 758 |
> |
wt = 1./sqrt( mymat[0][i]*mymat[0][i] + |
| 759 |
> |
mymat[1][i]*mymat[1][i] + |
| 760 |
> |
mymat[2][i]*mymat[2][i] ); |
| 761 |
> |
for (j = 3; j--; ) |
| 762 |
> |
mymat[j][i] *= wt; |
| 763 |
> |
} |
| 764 |
> |
if (!invmat4(inmat, mymat)) /* need inverse as well */ |
| 765 |
> |
error(INTERNAL, "cannot invert BSDF transform"); |
| 766 |
> |
newdist(nalt*nazi); /* resample distribution */ |
| 767 |
> |
for (i = b->ninc; i--; ) { |
| 768 |
> |
int direct_out = -1; |
| 769 |
> |
COLOR cdir; |
| 770 |
> |
getBSDF_incvec(dv, b, i); /* compute incident irrad. */ |
| 771 |
> |
multv3(dv, dv, mymat); |
| 772 |
> |
if (dv[2] < 0.0) { |
| 773 |
> |
dv[0] = -dv[0]; dv[1] = -dv[1]; dv[2] = -dv[2]; |
| 774 |
> |
direct_out += (direct_discount != NULL); |
| 775 |
> |
} |
| 776 |
> |
wt = getBSDF_incohm(b, i); |
| 777 |
> |
wt *= dv[2]; /* solid_angle*cosine(theta) */ |
| 778 |
> |
cp = &idist[3*i]; |
| 779 |
> |
copycolor(cinc, cp); |
| 780 |
> |
scalecolor(cinc, wt); |
| 781 |
> |
if (!direct_out) { /* discount direct contr. */ |
| 782 |
> |
cp = &direct_discount[3*i]; |
| 783 |
> |
copycolor(cdir, cp); |
| 784 |
> |
scalecolor(cdir, -wt); |
| 785 |
> |
if (b->nout != b->ninc) |
| 786 |
> |
direct_out = flatindex(dv, nalt, nazi); |
| 787 |
> |
else |
| 788 |
> |
direct_out = i; /* assumes dist. mirroring */ |
| 789 |
> |
} |
| 790 |
> |
for (k = nalt; k--; ) /* loop over distribution */ |
| 791 |
> |
for (j = nazi; j--; ) { |
| 792 |
> |
int rstart = random(); |
| 793 |
> |
for (c = NBSDFSAMPS; c--; ) { |
| 794 |
> |
double sp[2]; |
| 795 |
> |
multisamp(sp, 2, urand(rstart+c)); |
| 796 |
> |
flatdir(dv, (k + sp[0])/nalt, |
| 797 |
> |
(j + .5 - sp[1])/nazi); |
| 798 |
> |
multv3(dv, dv, inmat); |
| 799 |
> |
/* evaluate BSDF @ outgoing */ |
| 800 |
> |
o = getBSDF_outndx(b, dv); |
| 801 |
> |
if (o < 0) { |
| 802 |
> |
nout++; |
| 803 |
> |
continue; |
| 804 |
> |
} |
| 805 |
> |
wt = BSDF_value(b, i, o) * (1./NBSDFSAMPS); |
| 806 |
> |
copycolor(col, cinc); |
| 807 |
> |
if (b->nout != b->ninc) |
| 808 |
> |
o = k*nazi + j; |
| 809 |
> |
if (o == direct_out) |
| 810 |
> |
addcolor(col, cdir); /* minus direct */ |
| 811 |
> |
scalecolor(col, wt); |
| 812 |
> |
cp = &distarr[3*(k*nazi + j)]; |
| 813 |
> |
addcolor(cp, col); /* sum into distribution */ |
| 814 |
> |
} |
| 815 |
> |
} |
| 816 |
> |
} |
| 817 |
> |
free(idist); /* free temp space */ |
| 818 |
> |
if (nout) { |
| 819 |
> |
sprintf(errmsg, "missing %.1f%% of BSDF directions", |
| 820 |
> |
100.*nout/(b->ninc*nalt*nazi*NBSDFSAMPS)); |
| 821 |
> |
error(WARNING, errmsg); |
| 822 |
> |
} |
| 823 |
|
} |