| 10 |
|
#include "mkillum.h" |
| 11 |
|
#include "face.h" |
| 12 |
|
#include "cone.h" |
| 13 |
< |
#include "random.h" |
| 14 |
< |
#include "selcall.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); |
| 19 |
< |
static void flatdir(FVECT dv, double alt, double azi); |
| 16 |
> |
COLORV * distarr = NULL; /* distribution array */ |
| 17 |
> |
int distsiz = 0; |
| 18 |
|
|
| 19 |
|
|
| 20 |
< |
static void |
| 21 |
< |
rayclean( /* finish all pending rays */ |
| 22 |
< |
struct rtproc *rt0 |
| 20 |
> |
void |
| 21 |
> |
newdist( /* allocate & clear distribution array */ |
| 22 |
> |
int siz |
| 23 |
|
) |
| 24 |
|
{ |
| 25 |
< |
rayflush(rt0, 1); |
| 26 |
< |
while (raywait(rt0) != NULL) |
| 25 |
> |
if (siz <= 0) { |
| 26 |
> |
if (distsiz > 0) |
| 27 |
> |
free((void *)distarr); |
| 28 |
> |
distarr = NULL; |
| 29 |
> |
distsiz = 0; |
| 30 |
> |
return; |
| 31 |
> |
} |
| 32 |
> |
if (distsiz < 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(COLOR)*siz); |
| 41 |
> |
} |
| 42 |
> |
|
| 43 |
> |
|
| 44 |
> |
int |
| 45 |
> |
process_ray( /* process a ray result or report error */ |
| 46 |
> |
RAY *r, |
| 47 |
> |
int rv |
| 48 |
> |
) |
| 49 |
> |
{ |
| 50 |
> |
COLORV *colp; |
| 51 |
> |
|
| 52 |
> |
if (rv == 0) /* no result ready */ |
| 53 |
> |
return(0); |
| 54 |
> |
if (rv < 0) |
| 55 |
> |
error(USER, "ray tracing process died"); |
| 56 |
> |
if (r->rno >= distsiz) |
| 57 |
> |
error(INTERNAL, "bad returned index in process_ray"); |
| 58 |
> |
multcolor(r->rcol, r->rcoef); /* in case it's a source ray */ |
| 59 |
> |
colp = &distarr[r->rno * 3]; |
| 60 |
> |
addcolor(colp, r->rcol); |
| 61 |
> |
return(1); |
| 62 |
> |
} |
| 63 |
> |
|
| 64 |
> |
|
| 65 |
> |
void |
| 66 |
> |
raysamp( /* queue a ray sample */ |
| 67 |
> |
int ndx, |
| 68 |
> |
FVECT org, |
| 69 |
> |
FVECT dir |
| 70 |
> |
) |
| 71 |
> |
{ |
| 72 |
> |
RAY myRay; |
| 73 |
> |
int rv; |
| 74 |
> |
|
| 75 |
> |
if ((ndx < 0) | (ndx >= distsiz)) |
| 76 |
> |
error(INTERNAL, "bad index in raysamp"); |
| 77 |
> |
VCOPY(myRay.rorg, org); |
| 78 |
> |
VCOPY(myRay.rdir, dir); |
| 79 |
> |
myRay.rmax = .0; |
| 80 |
> |
rayorigin(&myRay, PRIMARY, NULL, NULL); |
| 81 |
> |
myRay.rno = ndx; |
| 82 |
> |
/* queue ray, check result */ |
| 83 |
> |
process_ray(&myRay, ray_pqueue(&myRay)); |
| 84 |
> |
} |
| 85 |
> |
|
| 86 |
> |
|
| 87 |
> |
void |
| 88 |
> |
srcsamps( /* sample sources from this surface position */ |
| 89 |
> |
struct illum_args *il, |
| 90 |
> |
FVECT org, |
| 91 |
> |
FVECT nrm, |
| 92 |
> |
MAT4 ixfm |
| 93 |
> |
) |
| 94 |
> |
{ |
| 95 |
> |
int nalt, nazi; |
| 96 |
> |
SRCINDEX si; |
| 97 |
> |
RAY sr; |
| 98 |
> |
FVECT v; |
| 99 |
> |
double d; |
| 100 |
> |
int i, j; |
| 101 |
> |
/* get sampling density */ |
| 102 |
> |
if (il->sampdens <= 0) { |
| 103 |
> |
nalt = nazi = 1; |
| 104 |
> |
} else { |
| 105 |
> |
i = PI * il->sampdens; |
| 106 |
> |
nalt = sqrt(i/PI) + .5; |
| 107 |
> |
nazi = PI*nalt + .5; |
| 108 |
> |
} |
| 109 |
> |
initsrcindex(&si); /* loop over (sub)sources */ |
| 110 |
> |
for ( ; ; ) { |
| 111 |
> |
VCOPY(sr.rorg, org); /* pick side to shoot from */ |
| 112 |
> |
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]; |
| 130 |
> |
if (!srcray(&sr, NULL, &si)) |
| 131 |
> |
break; /* end of sources */ |
| 132 |
> |
/* index direction */ |
| 133 |
> |
if (ixfm != NULL) |
| 134 |
> |
multv3(v, sr.rdir, ixfm); |
| 135 |
> |
else |
| 136 |
> |
VCOPY(v, sr.rdir); |
| 137 |
> |
if (il->sd != NULL) { |
| 138 |
> |
i = getBSDF_incndx(il->sd, v); |
| 139 |
> |
if (i < 0) |
| 140 |
> |
continue; /* must not be important */ |
| 141 |
> |
sr.rno = i; |
| 142 |
> |
d = getBSDF_incrad(il->sd, i); |
| 143 |
> |
d = 1.0/(PI*d*d); |
| 144 |
> |
} else { |
| 145 |
> |
if (v[2] >= -FTINY) |
| 146 |
> |
continue; /* only sample transmission */ |
| 147 |
> |
d = 1.0 - v[2]*v[2]; |
| 148 |
> |
i = d*nalt; |
| 149 |
> |
d = atan2(-v[1], -v[0])/(2.*PI); |
| 150 |
> |
if (d < 0.0) d += 1.0; |
| 151 |
> |
j = d*nazi + 0.5; |
| 152 |
> |
if (j >= nazi) j = 0; |
| 153 |
> |
sr.rno = i*nazi + j; |
| 154 |
> |
d = nalt*nazi/PI; |
| 155 |
> |
} |
| 156 |
> |
d *= si.dom; /* solid angle correction */ |
| 157 |
> |
scalecolor(sr.rcoef, d); |
| 158 |
> |
process_ray(&sr, ray_pqueue(&sr)); |
| 159 |
> |
} |
| 160 |
> |
} |
| 161 |
> |
|
| 162 |
> |
|
| 163 |
> |
void |
| 164 |
> |
rayclean() /* finish all pending rays */ |
| 165 |
> |
{ |
| 166 |
> |
RAY myRay; |
| 167 |
> |
|
| 168 |
> |
while (process_ray(&myRay, ray_presult(&myRay, 0))) |
| 169 |
|
; |
| 170 |
|
} |
| 171 |
|
|
| 172 |
|
|
| 173 |
< |
int /* XXX type conflict with otypes.h */ |
| 174 |
< |
o_default( /* default illum action */ |
| 173 |
> |
static void |
| 174 |
> |
mkaxes( /* compute u and v to go with n */ |
| 175 |
> |
FVECT u, |
| 176 |
> |
FVECT v, |
| 177 |
> |
FVECT n |
| 178 |
> |
) |
| 179 |
> |
{ |
| 180 |
> |
register int i; |
| 181 |
> |
|
| 182 |
> |
v[0] = v[1] = v[2] = 0.0; |
| 183 |
> |
for (i = 0; i < 3; i++) |
| 184 |
> |
if (n[i] < 0.6 && n[i] > -0.6) |
| 185 |
> |
break; |
| 186 |
> |
v[i] = 1.0; |
| 187 |
> |
fcross(u, v, n); |
| 188 |
> |
normalize(u); |
| 189 |
> |
fcross(v, n, u); |
| 190 |
> |
} |
| 191 |
> |
|
| 192 |
> |
|
| 193 |
> |
static void |
| 194 |
> |
rounddir( /* compute uniform spherical direction */ |
| 195 |
> |
register FVECT dv, |
| 196 |
> |
double alt, |
| 197 |
> |
double azi |
| 198 |
> |
) |
| 199 |
> |
{ |
| 200 |
> |
double d1, d2; |
| 201 |
> |
|
| 202 |
> |
dv[2] = 1. - 2.*alt; |
| 203 |
> |
d1 = sqrt(1. - dv[2]*dv[2]); |
| 204 |
> |
d2 = 2.*PI * azi; |
| 205 |
> |
dv[0] = d1*cos(d2); |
| 206 |
> |
dv[1] = d1*sin(d2); |
| 207 |
> |
} |
| 208 |
> |
|
| 209 |
> |
|
| 210 |
> |
void |
| 211 |
> |
flatdir( /* compute uniform hemispherical direction */ |
| 212 |
> |
FVECT dv, |
| 213 |
> |
double alt, |
| 214 |
> |
double azi |
| 215 |
> |
) |
| 216 |
> |
{ |
| 217 |
> |
double d1, d2; |
| 218 |
> |
|
| 219 |
> |
d1 = sqrt(alt); |
| 220 |
> |
d2 = 2.*PI * azi; |
| 221 |
> |
dv[0] = d1*cos(d2); |
| 222 |
> |
dv[1] = d1*sin(d2); |
| 223 |
> |
dv[2] = sqrt(1. - alt); |
| 224 |
> |
} |
| 225 |
> |
|
| 226 |
> |
|
| 227 |
> |
int |
| 228 |
> |
my_default( /* default illum action */ |
| 229 |
|
OBJREC *ob, |
| 230 |
|
struct illum_args *il, |
| 37 |
– |
struct rtproc *rt0, |
| 231 |
|
char *nm |
| 232 |
|
) |
| 233 |
|
{ |
| 240 |
|
|
| 241 |
|
|
| 242 |
|
int |
| 243 |
< |
o_face( /* make an illum face */ |
| 243 |
> |
my_face( /* make an illum face */ |
| 244 |
|
OBJREC *ob, |
| 245 |
|
struct illum_args *il, |
| 53 |
– |
struct rtproc *rt0, |
| 246 |
|
char *nm |
| 247 |
|
) |
| 248 |
|
{ |
| 249 |
< |
#define MAXMISS (5*n*il->nsamps) |
| 250 |
< |
int dim[3]; |
| 59 |
< |
int n, nalt, nazi, h; |
| 60 |
< |
float *distarr; |
| 249 |
> |
int dim[2]; |
| 250 |
> |
int n, nalt, nazi, alti; |
| 251 |
|
double sp[2], r1, r2; |
| 252 |
+ |
int h; |
| 253 |
|
FVECT dn, org, dir; |
| 254 |
|
FVECT u, v; |
| 255 |
|
double ur[2], vr[2]; |
| 256 |
< |
int nmisses; |
| 257 |
< |
register FACE *fa; |
| 258 |
< |
register int i, j; |
| 256 |
> |
MAT4 xfm; |
| 257 |
> |
int nallow; |
| 258 |
> |
FACE *fa; |
| 259 |
> |
int i, j; |
| 260 |
|
/* get/check arguments */ |
| 261 |
|
fa = getface(ob); |
| 262 |
|
if (fa->area == 0.0) { |
| 263 |
|
freeface(ob); |
| 264 |
< |
return(o_default(ob, il, rt0, nm)); |
| 264 |
> |
return(my_default(ob, il, nm)); |
| 265 |
|
} |
| 266 |
|
/* set up sampling */ |
| 267 |
< |
if (il->sampdens <= 0) |
| 268 |
< |
nalt = nazi = 1; |
| 269 |
< |
else { |
| 270 |
< |
n = PI * il->sampdens; |
| 271 |
< |
nalt = sqrt(n/PI) + .5; |
| 272 |
< |
nazi = PI*nalt + .5; |
| 267 |
> |
if (il->sd != NULL) { |
| 268 |
> |
if (!getBSDF_xfm(xfm, fa->norm, il->udir)) { |
| 269 |
> |
objerror(ob, WARNING, "illegal up direction"); |
| 270 |
> |
freeface(ob); |
| 271 |
> |
return(my_default(ob, il, nm)); |
| 272 |
> |
} |
| 273 |
> |
n = il->sd->ninc; |
| 274 |
> |
} else { |
| 275 |
> |
if (il->sampdens <= 0) { |
| 276 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
| 277 |
> |
} else { |
| 278 |
> |
n = PI * il->sampdens; |
| 279 |
> |
nalt = sqrt(n/PI) + .5; |
| 280 |
> |
nazi = PI*nalt + .5; |
| 281 |
> |
} |
| 282 |
> |
n = nazi*nalt; |
| 283 |
|
} |
| 284 |
< |
n = nalt*nazi; |
| 285 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
| 84 |
< |
if (distarr == NULL) |
| 85 |
< |
error(SYSTEM, "out of memory in o_face"); |
| 86 |
< |
/* take first edge longer than sqrt(area) */ |
| 284 |
> |
newdist(n); |
| 285 |
> |
/* take first edge >= sqrt(area) */ |
| 286 |
|
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
| 287 |
|
u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0]; |
| 288 |
|
u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1]; |
| 309 |
|
} |
| 310 |
|
dim[0] = random(); |
| 311 |
|
/* sample polygon */ |
| 312 |
< |
nmisses = 0; |
| 313 |
< |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
| 115 |
< |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
| 312 |
> |
nallow = 5*n*il->nsamps; |
| 313 |
> |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
| 314 |
|
for (i = 0; i < il->nsamps; i++) { |
| 315 |
< |
/* random direction */ |
| 316 |
< |
h = ilhash(dim, 3) + i; |
| 317 |
< |
multisamp(sp, 2, urand(h)); |
| 318 |
< |
r1 = (dim[1] + sp[0])/nalt; |
| 319 |
< |
r2 = (dim[2] + sp[1] - .5)/nazi; |
| 320 |
< |
flatdir(dn, r1, r2); |
| 321 |
< |
for (j = 0; j < 3; j++) |
| 322 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
| 323 |
< |
/* random location */ |
| 315 |
> |
/* randomize direction */ |
| 316 |
> |
h = ilhash(dim, 2) + i; |
| 317 |
> |
if (il->sd != NULL) { |
| 318 |
> |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
| 319 |
> |
} else { |
| 320 |
> |
multisamp(sp, 2, urand(h)); |
| 321 |
> |
alti = dim[1]/nazi; |
| 322 |
> |
r1 = (alti + sp[0])/nalt; |
| 323 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
| 324 |
> |
flatdir(dn, r1, r2); |
| 325 |
> |
for (j = 0; j < 3; j++) |
| 326 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - |
| 327 |
> |
dn[2]*fa->norm[j]; |
| 328 |
> |
} |
| 329 |
> |
/* randomize location */ |
| 330 |
|
do { |
| 331 |
< |
multisamp(sp, 2, urand(h+4862+nmisses)); |
| 331 |
> |
multisamp(sp, 2, urand(h+4862+nallow)); |
| 332 |
|
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
| 333 |
|
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
| 334 |
|
for (j = 0; j < 3; j++) |
| 335 |
|
org[j] = r1*u[j] + r2*v[j] |
| 336 |
|
+ fa->offset*fa->norm[j]; |
| 337 |
< |
} while (!inface(org, fa) && nmisses++ < MAXMISS); |
| 338 |
< |
if (nmisses > MAXMISS) { |
| 337 |
> |
} while (!inface(org, fa) && nallow-- > 0); |
| 338 |
> |
if (nallow < 0) { |
| 339 |
|
objerror(ob, WARNING, "bad aspect"); |
| 340 |
< |
rayclean(rt0); |
| 340 |
> |
rayclean(); |
| 341 |
|
freeface(ob); |
| 342 |
< |
free((void *)distarr); |
| 139 |
< |
return(o_default(ob, il, rt0, nm)); |
| 342 |
> |
return(my_default(ob, il, nm)); |
| 343 |
|
} |
| 344 |
+ |
if (il->sd != NULL && DOT(dir, fa->norm) < -FTINY) |
| 345 |
+ |
r1 = -1.0001*il->thick - 5.*FTINY; |
| 346 |
+ |
else |
| 347 |
+ |
r1 = 5.*FTINY; |
| 348 |
|
for (j = 0; j < 3; j++) |
| 349 |
< |
org[j] += .001*fa->norm[j]; |
| 349 |
> |
org[j] += r1*fa->norm[j]; |
| 350 |
|
/* send sample */ |
| 351 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt0); |
| 351 |
> |
raysamp(dim[1], org, dir); |
| 352 |
|
} |
| 353 |
< |
rayclean(rt0); |
| 353 |
> |
/* add in direct component? */ |
| 354 |
> |
if (!directvis && il->flags & IL_LIGHT) { |
| 355 |
> |
MAT4 ixfm; |
| 356 |
> |
if (il->sd == NULL) { |
| 357 |
> |
for (i = 3; i--; ) { |
| 358 |
> |
ixfm[i][0] = u[i]; |
| 359 |
> |
ixfm[i][1] = v[i]; |
| 360 |
> |
ixfm[i][2] = fa->norm[i]; |
| 361 |
> |
ixfm[i][3] = 0.; |
| 362 |
> |
} |
| 363 |
> |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
| 364 |
> |
ixfm[3][3] = 1.; |
| 365 |
> |
} else if (!invmat4(ixfm, xfm)) |
| 366 |
> |
objerror(ob, INTERNAL, "cannot invert BSDF transform"); |
| 367 |
> |
dim[0] = random(); |
| 368 |
> |
nallow = 10*il->nsamps; |
| 369 |
> |
for (i = 0; i < il->nsamps; i++) { |
| 370 |
> |
/* randomize location */ |
| 371 |
> |
h = dim[0] + samplendx++; |
| 372 |
> |
do { |
| 373 |
> |
multisamp(sp, 2, urand(h+nallow)); |
| 374 |
> |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
| 375 |
> |
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
| 376 |
> |
for (j = 0; j < 3; j++) |
| 377 |
> |
org[j] = r1*u[j] + r2*v[j] |
| 378 |
> |
+ fa->offset*fa->norm[j]; |
| 379 |
> |
} while (!inface(org, fa) && nallow-- > 0); |
| 380 |
> |
if (nallow < 0) { |
| 381 |
> |
objerror(ob, WARNING, "bad aspect"); |
| 382 |
> |
rayclean(); |
| 383 |
> |
freeface(ob); |
| 384 |
> |
return(my_default(ob, il, nm)); |
| 385 |
> |
} |
| 386 |
> |
/* sample source rays */ |
| 387 |
> |
srcsamps(il, org, fa->norm, ixfm); |
| 388 |
> |
} |
| 389 |
> |
} |
| 390 |
> |
/* wait for all rays to finish */ |
| 391 |
> |
rayclean(); |
| 392 |
> |
if (il->sd != NULL) { /* run distribution through BSDF */ |
| 393 |
> |
nalt = sqrt(il->sd->nout/PI) + .5; |
| 394 |
> |
nazi = PI*nalt + .5; |
| 395 |
> |
redistribute(il->sd, nalt, nazi, u, v, fa->norm, xfm); |
| 396 |
> |
} |
| 397 |
|
/* write out the face and its distribution */ |
| 398 |
< |
if (average(il, distarr, nalt*nazi)) { |
| 398 |
> |
if (average(il, distarr, n)) { |
| 399 |
|
if (il->sampdens > 0) |
| 400 |
|
flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
| 401 |
|
illumout(il, ob); |
| 403 |
|
printobj(il->altmat, ob); |
| 404 |
|
/* clean up */ |
| 405 |
|
freeface(ob); |
| 156 |
– |
free((void *)distarr); |
| 406 |
|
return(0); |
| 158 |
– |
#undef MAXMISS |
| 407 |
|
} |
| 408 |
|
|
| 409 |
|
|
| 410 |
|
int |
| 411 |
< |
o_sphere( /* make an illum sphere */ |
| 411 |
> |
my_sphere( /* make an illum sphere */ |
| 412 |
|
register OBJREC *ob, |
| 413 |
|
struct illum_args *il, |
| 166 |
– |
struct rtproc *rt0, |
| 414 |
|
char *nm |
| 415 |
|
) |
| 416 |
|
{ |
| 417 |
|
int dim[3]; |
| 418 |
|
int n, nalt, nazi; |
| 172 |
– |
float *distarr; |
| 419 |
|
double sp[4], r1, r2, r3; |
| 420 |
|
FVECT org, dir; |
| 421 |
|
FVECT u, v; |
| 431 |
|
nalt = sqrt(2./PI*n) + .5; |
| 432 |
|
nazi = PI/2.*nalt + .5; |
| 433 |
|
} |
| 434 |
+ |
if (il->sd != NULL) |
| 435 |
+ |
objerror(ob, WARNING, "BSDF ignored"); |
| 436 |
|
n = nalt*nazi; |
| 437 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
| 190 |
< |
if (distarr == NULL) |
| 191 |
< |
error(SYSTEM, "out of memory in o_sphere"); |
| 437 |
> |
newdist(n); |
| 438 |
|
dim[0] = random(); |
| 439 |
|
/* sample sphere */ |
| 440 |
|
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
| 459 |
|
dir[j] = -dir[j]; |
| 460 |
|
} |
| 461 |
|
/* send sample */ |
| 462 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt0); |
| 462 |
> |
raysamp(dim[1]*nazi+dim[2], org, dir); |
| 463 |
|
} |
| 464 |
< |
rayclean(rt0); |
| 464 |
> |
/* wait for all rays to finish */ |
| 465 |
> |
rayclean(); |
| 466 |
|
/* write out the sphere and its distribution */ |
| 467 |
< |
if (average(il, distarr, nalt*nazi)) { |
| 467 |
> |
if (average(il, distarr, n)) { |
| 468 |
|
if (il->sampdens > 0) |
| 469 |
|
roundout(il, distarr, nalt, nazi); |
| 470 |
|
else |
| 473 |
|
} else |
| 474 |
|
printobj(il->altmat, ob); |
| 475 |
|
/* clean up */ |
| 229 |
– |
free((void *)distarr); |
| 476 |
|
return(1); |
| 477 |
|
} |
| 478 |
|
|
| 479 |
|
|
| 480 |
|
int |
| 481 |
< |
o_ring( /* make an illum ring */ |
| 481 |
> |
my_ring( /* make an illum ring */ |
| 482 |
|
OBJREC *ob, |
| 483 |
|
struct illum_args *il, |
| 238 |
– |
struct rtproc *rt0, |
| 484 |
|
char *nm |
| 485 |
|
) |
| 486 |
|
{ |
| 487 |
< |
int dim[3]; |
| 488 |
< |
int n, nalt, nazi; |
| 489 |
< |
float *distarr; |
| 490 |
< |
double sp[4], r1, r2, r3; |
| 487 |
> |
int dim[2]; |
| 488 |
> |
int n, nalt, nazi, alti; |
| 489 |
> |
double sp[2], r1, r2, r3; |
| 490 |
> |
int h; |
| 491 |
|
FVECT dn, org, dir; |
| 492 |
|
FVECT u, v; |
| 493 |
< |
register CONE *co; |
| 494 |
< |
register int i, j; |
| 493 |
> |
MAT4 xfm; |
| 494 |
> |
CONE *co; |
| 495 |
> |
int i, j; |
| 496 |
|
/* get/check arguments */ |
| 497 |
|
co = getcone(ob, 0); |
| 498 |
|
/* set up sampling */ |
| 499 |
< |
if (il->sampdens <= 0) |
| 500 |
< |
nalt = nazi = 1; |
| 501 |
< |
else { |
| 502 |
< |
n = PI * il->sampdens; |
| 503 |
< |
nalt = sqrt(n/PI) + .5; |
| 504 |
< |
nazi = PI*nalt + .5; |
| 499 |
> |
if (il->sd != NULL) { |
| 500 |
> |
if (!getBSDF_xfm(xfm, co->ad, il->udir)) { |
| 501 |
> |
objerror(ob, WARNING, "illegal up direction"); |
| 502 |
> |
freecone(ob); |
| 503 |
> |
return(my_default(ob, il, nm)); |
| 504 |
> |
} |
| 505 |
> |
n = il->sd->ninc; |
| 506 |
> |
} else { |
| 507 |
> |
if (il->sampdens <= 0) { |
| 508 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
| 509 |
> |
} else { |
| 510 |
> |
n = PI * il->sampdens; |
| 511 |
> |
nalt = sqrt(n/PI) + .5; |
| 512 |
> |
nazi = PI*nalt + .5; |
| 513 |
> |
} |
| 514 |
> |
n = nazi*nalt; |
| 515 |
|
} |
| 516 |
< |
n = nalt*nazi; |
| 261 |
< |
distarr = (float *)calloc(n, 3*sizeof(float)); |
| 262 |
< |
if (distarr == NULL) |
| 263 |
< |
error(SYSTEM, "out of memory in o_ring"); |
| 516 |
> |
newdist(n); |
| 517 |
|
mkaxes(u, v, co->ad); |
| 518 |
|
dim[0] = random(); |
| 519 |
|
/* sample disk */ |
| 520 |
< |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
| 268 |
< |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
| 520 |
> |
for (dim[1] = 0; dim[1] < n; dim[1]++) |
| 521 |
|
for (i = 0; i < il->nsamps; i++) { |
| 522 |
|
/* next sample point */ |
| 523 |
< |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
| 524 |
< |
/* random direction */ |
| 525 |
< |
r1 = (dim[1] + sp[0])/nalt; |
| 526 |
< |
r2 = (dim[2] + sp[1] - .5)/nazi; |
| 527 |
< |
flatdir(dn, r1, r2); |
| 528 |
< |
for (j = 0; j < 3; j++) |
| 529 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
| 530 |
< |
/* random location */ |
| 523 |
> |
h = ilhash(dim,2) + i; |
| 524 |
> |
/* randomize direction */ |
| 525 |
> |
if (il->sd != NULL) { |
| 526 |
> |
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
| 527 |
> |
} else { |
| 528 |
> |
multisamp(sp, 2, urand(h)); |
| 529 |
> |
alti = dim[1]/nazi; |
| 530 |
> |
r1 = (alti + sp[0])/nalt; |
| 531 |
> |
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
| 532 |
> |
flatdir(dn, r1, r2); |
| 533 |
> |
for (j = 0; j < 3; j++) |
| 534 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
| 535 |
> |
} |
| 536 |
> |
/* randomize location */ |
| 537 |
> |
multisamp(sp, 2, urand(h+8371)); |
| 538 |
|
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
| 539 |
< |
sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
| 540 |
< |
r2 = 2.*PI*sp[3]; |
| 539 |
> |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
| 540 |
> |
r2 = 2.*PI*sp[1]; |
| 541 |
|
r1 = r3*cos(r2); |
| 542 |
|
r2 = r3*sin(r2); |
| 543 |
+ |
if (il->sd != NULL && DOT(dir, co->ad) < -FTINY) |
| 544 |
+ |
r3 = -1.0001*il->thick - 5.*FTINY; |
| 545 |
+ |
else |
| 546 |
+ |
r3 = 5.*FTINY; |
| 547 |
|
for (j = 0; j < 3; j++) |
| 548 |
|
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
| 549 |
< |
.001*co->ad[j]; |
| 287 |
< |
|
| 549 |
> |
r3*co->ad[j]; |
| 550 |
|
/* send sample */ |
| 551 |
< |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt0); |
| 551 |
> |
raysamp(dim[1], org, dir); |
| 552 |
|
} |
| 553 |
< |
rayclean(rt0); |
| 553 |
> |
/* add in direct component? */ |
| 554 |
> |
if (!directvis && il->flags & IL_LIGHT) { |
| 555 |
> |
MAT4 ixfm; |
| 556 |
> |
if (il->sd == NULL) { |
| 557 |
> |
for (i = 3; i--; ) { |
| 558 |
> |
ixfm[i][0] = u[i]; |
| 559 |
> |
ixfm[i][1] = v[i]; |
| 560 |
> |
ixfm[i][2] = co->ad[i]; |
| 561 |
> |
ixfm[i][3] = 0.; |
| 562 |
> |
} |
| 563 |
> |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
| 564 |
> |
ixfm[3][3] = 1.; |
| 565 |
> |
} else if (!invmat4(ixfm, xfm)) |
| 566 |
> |
objerror(ob, INTERNAL, "cannot invert BSDF transform"); |
| 567 |
> |
dim[0] = random(); |
| 568 |
> |
for (i = 0; i < il->nsamps; i++) { |
| 569 |
> |
/* randomize location */ |
| 570 |
> |
h = dim[0] + samplendx++; |
| 571 |
> |
multisamp(sp, 2, urand(h)); |
| 572 |
> |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
| 573 |
> |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
| 574 |
> |
r2 = 2.*PI*sp[1]; |
| 575 |
> |
r1 = r3*cos(r2); |
| 576 |
> |
r2 = r3*sin(r2); |
| 577 |
> |
for (j = 0; j < 3; j++) |
| 578 |
> |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j]; |
| 579 |
> |
/* sample source rays */ |
| 580 |
> |
srcsamps(il, org, co->ad, ixfm); |
| 581 |
> |
} |
| 582 |
> |
} |
| 583 |
> |
/* wait for all rays to finish */ |
| 584 |
> |
rayclean(); |
| 585 |
> |
if (il->sd != NULL) { /* run distribution through BSDF */ |
| 586 |
> |
nalt = sqrt(il->sd->nout/PI) + .5; |
| 587 |
> |
nazi = PI*nalt + .5; |
| 588 |
> |
redistribute(il->sd, nalt, nazi, u, v, co->ad, xfm); |
| 589 |
> |
} |
| 590 |
|
/* write out the ring and its distribution */ |
| 591 |
< |
if (average(il, distarr, nalt*nazi)) { |
| 591 |
> |
if (average(il, distarr, n)) { |
| 592 |
|
if (il->sampdens > 0) |
| 593 |
|
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
| 594 |
|
illumout(il, ob); |
| 596 |
|
printobj(il->altmat, ob); |
| 597 |
|
/* clean up */ |
| 598 |
|
freecone(ob); |
| 301 |
– |
free((void *)distarr); |
| 599 |
|
return(1); |
| 303 |
– |
} |
| 304 |
– |
|
| 305 |
– |
|
| 306 |
– |
void |
| 307 |
– |
raysamp( /* queue a ray sample */ |
| 308 |
– |
float res[3], |
| 309 |
– |
FVECT org, |
| 310 |
– |
FVECT dir, |
| 311 |
– |
struct rtproc *rt0 |
| 312 |
– |
) |
| 313 |
– |
{ |
| 314 |
– |
register struct rtproc *rt; |
| 315 |
– |
register float *fp; |
| 316 |
– |
|
| 317 |
– |
for (rt = rt0; rt != NULL; rt = rt->next) |
| 318 |
– |
if (rt->nrays < rt->bsiz && rt->dest[rt->nrays] == NULL) |
| 319 |
– |
break; |
| 320 |
– |
if (rt == NULL) /* need to free up buffer? */ |
| 321 |
– |
rt = raywait(rt0); |
| 322 |
– |
if (rt == NULL) |
| 323 |
– |
error(SYSTEM, "raywait() returned NULL"); |
| 324 |
– |
fp = rt->buf + 6*rt->nrays; |
| 325 |
– |
*fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2]; |
| 326 |
– |
*fp++ = dir[0]; *fp++ = dir[1]; *fp = dir[2]; |
| 327 |
– |
rt->dest[rt->nrays++] = res; |
| 328 |
– |
if (rt->nrays == rt->bsiz) |
| 329 |
– |
rayflush(rt, 0); |
| 330 |
– |
} |
| 331 |
– |
|
| 332 |
– |
|
| 333 |
– |
void |
| 334 |
– |
rayflush( /* flush queued rays to rtrace */ |
| 335 |
– |
register struct rtproc *rt, |
| 336 |
– |
int doall |
| 337 |
– |
) |
| 338 |
– |
{ |
| 339 |
– |
int nw; |
| 340 |
– |
|
| 341 |
– |
do { |
| 342 |
– |
if (rt->nrays <= 0) |
| 343 |
– |
continue; |
| 344 |
– |
memset(rt->buf+6*rt->nrays, 0, 6*sizeof(float)); |
| 345 |
– |
nw = 6*sizeof(float)*(rt->nrays+1); |
| 346 |
– |
errno = 0; |
| 347 |
– |
if (writebuf(rt->pd.w, (char *)rt->buf, nw) < nw) |
| 348 |
– |
error(SYSTEM, "error writing to rtrace process"); |
| 349 |
– |
rt->nrays = 0; /* flag buffer as flushed */ |
| 350 |
– |
} while (doall && (rt = rt->next) != NULL); |
| 351 |
– |
} |
| 352 |
– |
|
| 353 |
– |
|
| 354 |
– |
struct rtproc * |
| 355 |
– |
raywait( /* retrieve rtrace results */ |
| 356 |
– |
struct rtproc *rt0 |
| 357 |
– |
) |
| 358 |
– |
{ |
| 359 |
– |
fd_set readset, errset; |
| 360 |
– |
int nr; |
| 361 |
– |
struct rtproc *rt, *rtfree; |
| 362 |
– |
register int n; |
| 363 |
– |
/* prepare select call */ |
| 364 |
– |
FD_ZERO(&readset); FD_ZERO(&errset); n = 0; |
| 365 |
– |
nr = 0; |
| 366 |
– |
for (rt = rt0; rt != NULL; rt = rt->next) { |
| 367 |
– |
if (rt->nrays == 0 && rt->dest[0] != NULL) { |
| 368 |
– |
FD_SET(rt->pd.r, &readset); |
| 369 |
– |
++nr; |
| 370 |
– |
} |
| 371 |
– |
FD_SET(rt->pd.r, &errset); |
| 372 |
– |
if (rt->pd.r >= n) |
| 373 |
– |
n = rt->pd.r + 1; |
| 374 |
– |
} |
| 375 |
– |
if (!nr) /* no rays pending */ |
| 376 |
– |
return(NULL); |
| 377 |
– |
if (nr > 1) /* call select for multiple processes */ |
| 378 |
– |
n = select(n, &readset, (fd_set *)NULL, &errset, |
| 379 |
– |
(struct timeval *)NULL); |
| 380 |
– |
else |
| 381 |
– |
FD_ZERO(&errset); |
| 382 |
– |
if (n <= 0) |
| 383 |
– |
return(NULL); |
| 384 |
– |
rtfree = NULL; /* read from ready process(es) */ |
| 385 |
– |
for (rt = rt0; rt != NULL; rt = rt->next) { |
| 386 |
– |
if (!FD_ISSET(rt->pd.r, &readset) && |
| 387 |
– |
!FD_ISSET(rt->pd.r, &errset)) |
| 388 |
– |
continue; |
| 389 |
– |
for (n = 0; n < rt->bsiz && rt->dest[n] != NULL; n++) |
| 390 |
– |
; |
| 391 |
– |
errno = 0; |
| 392 |
– |
nr = read(rt->pd.r, (char *)rt->buf, 3*sizeof(float)*(n+1)); |
| 393 |
– |
if (nr < 0) |
| 394 |
– |
error(SYSTEM, "read error in raywait()"); |
| 395 |
– |
if (nr == 0) /* unexpected EOF */ |
| 396 |
– |
error(USER, "rtrace process died"); |
| 397 |
– |
if (nr < 3*sizeof(float)*(n+1)) { /* read the rest */ |
| 398 |
– |
nr = readbuf(rt->pd.r, (char *)rt->buf, |
| 399 |
– |
3*sizeof(float)*(n+1) - nr); |
| 400 |
– |
if (nr < 0) |
| 401 |
– |
error(USER, "readbuf error in raywait()"); |
| 402 |
– |
} |
| 403 |
– |
while (n-- > 0) { |
| 404 |
– |
rt->dest[n][0] += rt->buf[3*n]; |
| 405 |
– |
rt->dest[n][1] += rt->buf[3*n+1]; |
| 406 |
– |
rt->dest[n][2] += rt->buf[3*n+2]; |
| 407 |
– |
rt->dest[n] = NULL; |
| 408 |
– |
} |
| 409 |
– |
rtfree = rt; |
| 410 |
– |
} |
| 411 |
– |
return(rtfree); |
| 412 |
– |
} |
| 413 |
– |
|
| 414 |
– |
|
| 415 |
– |
static void |
| 416 |
– |
mkaxes( /* compute u and v to go with n */ |
| 417 |
– |
FVECT u, |
| 418 |
– |
FVECT v, |
| 419 |
– |
FVECT n |
| 420 |
– |
) |
| 421 |
– |
{ |
| 422 |
– |
register int i; |
| 423 |
– |
|
| 424 |
– |
v[0] = v[1] = v[2] = 0.0; |
| 425 |
– |
for (i = 0; i < 3; i++) |
| 426 |
– |
if (n[i] < 0.6 && n[i] > -0.6) |
| 427 |
– |
break; |
| 428 |
– |
v[i] = 1.0; |
| 429 |
– |
fcross(u, v, n); |
| 430 |
– |
normalize(u); |
| 431 |
– |
fcross(v, n, u); |
| 432 |
– |
} |
| 433 |
– |
|
| 434 |
– |
|
| 435 |
– |
static void |
| 436 |
– |
rounddir( /* compute uniform spherical direction */ |
| 437 |
– |
register FVECT dv, |
| 438 |
– |
double alt, |
| 439 |
– |
double azi |
| 440 |
– |
) |
| 441 |
– |
{ |
| 442 |
– |
double d1, d2; |
| 443 |
– |
|
| 444 |
– |
dv[2] = 1. - 2.*alt; |
| 445 |
– |
d1 = sqrt(1. - dv[2]*dv[2]); |
| 446 |
– |
d2 = 2.*PI * azi; |
| 447 |
– |
dv[0] = d1*cos(d2); |
| 448 |
– |
dv[1] = d1*sin(d2); |
| 449 |
– |
} |
| 450 |
– |
|
| 451 |
– |
|
| 452 |
– |
static void |
| 453 |
– |
flatdir( /* compute uniform hemispherical direction */ |
| 454 |
– |
register FVECT dv, |
| 455 |
– |
double alt, |
| 456 |
– |
double azi |
| 457 |
– |
) |
| 458 |
– |
{ |
| 459 |
– |
double d1, d2; |
| 460 |
– |
|
| 461 |
– |
d1 = sqrt(alt); |
| 462 |
– |
d2 = 2.*PI * azi; |
| 463 |
– |
dv[0] = d1*cos(d2); |
| 464 |
– |
dv[1] = d1*sin(d2); |
| 465 |
– |
dv[2] = sqrt(1. - alt); |
| 600 |
|
} |
