| 1 |
< |
/* Copyright (c) 1986 Regents of the University of California */ |
| 1 |
> |
/* Copyright (c) 1991 Regents of the University of California */ |
| 2 |
|
|
| 3 |
|
#ifndef lint |
| 4 |
|
static char SCCSid[] = "$SunId$ LBL"; |
| 19 |
|
|
| 20 |
|
#include "otypes.h" |
| 21 |
|
|
| 22 |
+ |
#include "ambient.h" |
| 23 |
+ |
|
| 24 |
|
#include "random.h" |
| 25 |
|
|
| 26 |
|
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
| 27 |
|
|
| 26 |
– |
extern CUBE thescene; /* contains space boundaries */ |
| 27 |
– |
|
| 28 |
– |
extern COLOR ambval; /* global ambient component */ |
| 29 |
– |
extern double ambacc; /* ambient accuracy */ |
| 30 |
– |
extern int ambres; /* ambient resolution */ |
| 31 |
– |
extern int ambdiv; /* number of divisions for calculation */ |
| 32 |
– |
extern int ambssamp; /* number of super-samples */ |
| 33 |
– |
extern int ambounce; /* number of ambient bounces */ |
| 34 |
– |
extern char *amblist[]; /* ambient include/exclude list */ |
| 35 |
– |
extern int ambincl; /* include == 1, exclude == 0 */ |
| 36 |
– |
|
| 37 |
– |
OBJECT ambset[256]={0}; /* ambient include/exclude set */ |
| 38 |
– |
|
| 39 |
– |
double maxarad; /* maximum ambient radius */ |
| 40 |
– |
double minarad; /* minimum ambient radius */ |
| 41 |
– |
|
| 42 |
– |
typedef struct ambval { |
| 43 |
– |
FVECT pos; /* position in space */ |
| 44 |
– |
FVECT dir; /* normal direction */ |
| 45 |
– |
int lvl; /* recursion level of parent ray */ |
| 46 |
– |
float weight; /* weight of parent ray */ |
| 47 |
– |
COLOR val; /* computed ambient value */ |
| 48 |
– |
float rad; /* validity radius */ |
| 49 |
– |
struct ambval *next; /* next in list */ |
| 50 |
– |
} AMBVAL; /* ambient value */ |
| 51 |
– |
|
| 28 |
|
typedef struct ambtree { |
| 29 |
|
AMBVAL *alist; /* ambient value list */ |
| 30 |
|
struct ambtree *kid; /* 8 child nodes */ |
| 31 |
|
} AMBTREE; /* ambient octree */ |
| 32 |
|
|
| 33 |
< |
typedef struct { |
| 58 |
< |
float k; /* error contribution per sample */ |
| 59 |
< |
COLOR v; /* ray sum */ |
| 60 |
< |
int n; /* number of samples */ |
| 61 |
< |
short t, p; /* theta, phi indices */ |
| 62 |
< |
} AMBSAMP; /* ambient sample */ |
| 33 |
> |
extern CUBE thescene; /* contains space boundaries */ |
| 34 |
|
|
| 35 |
+ |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
| 36 |
+ |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
| 37 |
+ |
|
| 38 |
+ |
double maxarad; /* maximum ambient radius */ |
| 39 |
+ |
double minarad; /* minimum ambient radius */ |
| 40 |
+ |
|
| 41 |
|
static AMBTREE atrunk; /* our ambient trunk node */ |
| 42 |
|
|
| 43 |
|
static FILE *ambfp = NULL; /* ambient file pointer */ |
| 46 |
|
|
| 47 |
|
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
| 48 |
|
|
| 72 |
– |
double sumambient(), doambient(), makeambient(); |
| 49 |
|
|
| 74 |
– |
|
| 50 |
|
setambient(afile) /* initialize calculation */ |
| 51 |
|
char *afile; |
| 52 |
|
{ |
| 76 |
|
ambnotify(obj) /* record new modifier */ |
| 77 |
|
OBJECT obj; |
| 78 |
|
{ |
| 79 |
+ |
static int hitlimit = 0; |
| 80 |
|
register OBJREC *o = objptr(obj); |
| 81 |
|
register char **amblp; |
| 82 |
|
|
| 83 |
< |
if (!ismodifier(o->otype)) |
| 83 |
> |
if (hitlimit || !ismodifier(o->otype)) |
| 84 |
|
return; |
| 85 |
|
for (amblp = amblist; *amblp != NULL; amblp++) |
| 86 |
|
if (!strcmp(o->oname, *amblp)) { |
| 87 |
+ |
if (ambset[0] >= MAXASET) { |
| 88 |
+ |
error(WARNING, "too many modifiers in ambient list"); |
| 89 |
+ |
hitlimit++; |
| 90 |
+ |
return; /* should this be fatal? */ |
| 91 |
+ |
} |
| 92 |
|
insertelem(ambset, obj); |
| 93 |
|
return; |
| 94 |
|
} |
| 115 |
|
goto dumbamb; |
| 116 |
|
|
| 117 |
|
if (ambacc <= FTINY) { /* no ambient storage */ |
| 118 |
< |
if (doambient(acol, r) == 0.0) |
| 118 |
> |
if (doambient(acol, r, NULL, NULL) == 0.0) |
| 119 |
|
goto dumbamb; |
| 120 |
|
goto done; |
| 121 |
|
} |
| 183 |
|
for (j = 0; j < 3; j++) |
| 184 |
|
d += (r->rop[j] - av->pos[j]) * |
| 185 |
|
(av->dir[j] + r->ron[j]); |
| 186 |
< |
if (d < -minarad) |
| 186 |
> |
if (d*0.5 < -minarad*ambacc) |
| 187 |
|
continue; |
| 188 |
|
/* |
| 189 |
|
* Jittering final test reduces image artifacts. |
| 197 |
|
else |
| 198 |
|
wt = 1.0 / wt; |
| 199 |
|
wsum += wt; |
| 200 |
< |
copycolor(ct, av->val); |
| 200 |
> |
extambient(ct, av, r->rop, r->ron); |
| 201 |
|
scalecolor(ct, wt); |
| 202 |
|
addcolor(acol, ct); |
| 203 |
|
} |
| 228 |
|
register RAY *r; |
| 229 |
|
{ |
| 230 |
|
AMBVAL amb; |
| 231 |
+ |
FVECT gp, gd; |
| 232 |
|
|
| 233 |
< |
amb.rad = doambient(acol, r); /* compute ambient */ |
| 233 |
> |
amb.rad = doambient(acol, r, gp, gd); /* compute ambient */ |
| 234 |
|
if (amb.rad == 0.0) |
| 235 |
|
return(0.0); |
| 236 |
|
/* store it */ |
| 239 |
|
amb.lvl = r->rlvl; |
| 240 |
|
amb.weight = r->rweight; |
| 241 |
|
copycolor(amb.val, acol); |
| 242 |
+ |
VCOPY(amb.gpos, gp); |
| 243 |
+ |
VCOPY(amb.gdir, gd); |
| 244 |
|
/* insert into tree */ |
| 245 |
|
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
| 246 |
|
avsave(&amb); /* write to file */ |
| 248 |
|
} |
| 249 |
|
|
| 250 |
|
|
| 251 |
< |
double |
| 252 |
< |
doambient(acol, r) /* compute ambient component */ |
| 253 |
< |
COLOR acol; |
| 254 |
< |
register RAY *r; |
| 251 |
> |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
| 252 |
> |
COLOR cr; |
| 253 |
> |
register AMBVAL *ap; |
| 254 |
> |
FVECT pv, nv; |
| 255 |
|
{ |
| 256 |
< |
extern int ambcmp(); |
| 257 |
< |
extern double sin(), cos(), sqrt(); |
| 258 |
< |
double phi, xd, yd, zd; |
| 275 |
< |
double b, b2; |
| 276 |
< |
register AMBSAMP *div; |
| 277 |
< |
AMBSAMP dnew; |
| 278 |
< |
RAY ar; |
| 279 |
< |
FVECT ux, uy; |
| 280 |
< |
double arad; |
| 281 |
< |
int ndivs, nt, np, ns, ne, i, j; |
| 282 |
< |
register int k; |
| 256 |
> |
FVECT v1, v2; |
| 257 |
> |
register int i; |
| 258 |
> |
double d; |
| 259 |
|
|
| 260 |
< |
setcolor(acol, 0.0, 0.0, 0.0); |
| 261 |
< |
/* set number of divisions */ |
| 262 |
< |
nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5; |
| 263 |
< |
np = 2 * nt; |
| 264 |
< |
ndivs = nt * np; |
| 265 |
< |
/* check first */ |
| 266 |
< |
if (ndivs == 0 || rayorigin(&ar, r, AMBIENT, 0.5) < 0) |
| 267 |
< |
return(0.0); |
| 268 |
< |
/* set number of super-samples */ |
| 269 |
< |
ns = ambssamp * r->rweight + 0.5; |
| 270 |
< |
if (ns > 0) { |
| 295 |
< |
div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP)); |
| 296 |
< |
if (div == NULL) |
| 297 |
< |
error(SYSTEM, "out of memory in doambient"); |
| 260 |
> |
d = 1.0; /* zeroeth order */ |
| 261 |
> |
/* gradient due to translation */ |
| 262 |
> |
for (i = 0; i < 3; i++) |
| 263 |
> |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
| 264 |
> |
/* gradient due to rotation */ |
| 265 |
> |
VCOPY(v1, ap->dir); |
| 266 |
> |
fcross(v2, v1, nv); |
| 267 |
> |
d += DOT(ap->gdir, v2); |
| 268 |
> |
if (d <= 0.0) { |
| 269 |
> |
setcolor(cr, 0.0, 0.0, 0.0); |
| 270 |
> |
return; |
| 271 |
|
} |
| 272 |
< |
/* make axes */ |
| 273 |
< |
uy[0] = uy[1] = uy[2] = 0.0; |
| 301 |
< |
for (k = 0; k < 3; k++) |
| 302 |
< |
if (r->ron[k] < 0.6 && r->ron[k] > -0.6) |
| 303 |
< |
break; |
| 304 |
< |
uy[k] = 1.0; |
| 305 |
< |
fcross(ux, r->ron, uy); |
| 306 |
< |
normalize(ux); |
| 307 |
< |
fcross(uy, ux, r->ron); |
| 308 |
< |
/* sample divisions */ |
| 309 |
< |
arad = 0.0; |
| 310 |
< |
ne = 0; |
| 311 |
< |
for (i = 0; i < nt; i++) |
| 312 |
< |
for (j = 0; j < np; j++) { |
| 313 |
< |
rayorigin(&ar, r, AMBIENT, 0.5); /* pretested */ |
| 314 |
< |
zd = sqrt((i+frandom())/nt); |
| 315 |
< |
phi = 2.0*PI * (j+frandom())/np; |
| 316 |
< |
xd = cos(phi) * zd; |
| 317 |
< |
yd = sin(phi) * zd; |
| 318 |
< |
zd = sqrt(1.0 - zd*zd); |
| 319 |
< |
for (k = 0; k < 3; k++) |
| 320 |
< |
ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k]; |
| 321 |
< |
rayvalue(&ar); |
| 322 |
< |
if (ar.rot < FHUGE) |
| 323 |
< |
arad += 1.0 / ar.rot; |
| 324 |
< |
if (ns > 0) { /* save division */ |
| 325 |
< |
div[ne].k = 0.0; |
| 326 |
< |
copycolor(div[ne].v, ar.rcol); |
| 327 |
< |
div[ne].n = 0; |
| 328 |
< |
div[ne].t = i; div[ne].p = j; |
| 329 |
< |
/* sum errors */ |
| 330 |
< |
b = bright(ar.rcol); |
| 331 |
< |
if (i > 0) { /* from above */ |
| 332 |
< |
b2 = bright(div[ne-np].v) - b; |
| 333 |
< |
b2 *= b2 * 0.25; |
| 334 |
< |
div[ne].k += b2; |
| 335 |
< |
div[ne].n++; |
| 336 |
< |
div[ne-np].k += b2; |
| 337 |
< |
div[ne-np].n++; |
| 338 |
< |
} |
| 339 |
< |
if (j > 0) { /* from behind */ |
| 340 |
< |
b2 = bright(div[ne-1].v) - b; |
| 341 |
< |
b2 *= b2 * 0.25; |
| 342 |
< |
div[ne].k += b2; |
| 343 |
< |
div[ne].n++; |
| 344 |
< |
div[ne-1].k += b2; |
| 345 |
< |
div[ne-1].n++; |
| 346 |
< |
} |
| 347 |
< |
if (j == np-1) { /* around */ |
| 348 |
< |
b2 = bright(div[ne-(np-1)].v) - b; |
| 349 |
< |
b2 *= b2 * 0.25; |
| 350 |
< |
div[ne].k += b2; |
| 351 |
< |
div[ne].n++; |
| 352 |
< |
div[ne-(np-1)].k += b2; |
| 353 |
< |
div[ne-(np-1)].n++; |
| 354 |
< |
} |
| 355 |
< |
ne++; |
| 356 |
< |
} else |
| 357 |
< |
addcolor(acol, ar.rcol); |
| 358 |
< |
} |
| 359 |
< |
for (k = 0; k < ne; k++) { /* compute errors */ |
| 360 |
< |
if (div[k].n > 1) |
| 361 |
< |
div[k].k /= div[k].n; |
| 362 |
< |
div[k].n = 1; |
| 363 |
< |
} |
| 364 |
< |
/* sort the divisions */ |
| 365 |
< |
qsort(div, ne, sizeof(AMBSAMP), ambcmp); |
| 366 |
< |
/* skim excess */ |
| 367 |
< |
while (ne > ns) { |
| 368 |
< |
ne--; |
| 369 |
< |
addcolor(acol, div[ne].v); |
| 370 |
< |
} |
| 371 |
< |
/* super-sample */ |
| 372 |
< |
for (i = ns; i > 0; i--) { |
| 373 |
< |
rayorigin(&ar, r, AMBIENT, 0.5); /* pretested */ |
| 374 |
< |
zd = sqrt((div[0].t+frandom())/nt); |
| 375 |
< |
phi = 2.0*PI * (div[0].p+frandom())/np; |
| 376 |
< |
xd = cos(phi) * zd; |
| 377 |
< |
yd = sin(phi) * zd; |
| 378 |
< |
zd = sqrt(1.0 - zd*zd); |
| 379 |
< |
for (k = 0; k < 3; k++) |
| 380 |
< |
ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k]; |
| 381 |
< |
rayvalue(&ar); |
| 382 |
< |
if (ar.rot < FHUGE) |
| 383 |
< |
arad += 1.0 / ar.rot; |
| 384 |
< |
/* recompute error */ |
| 385 |
< |
copycolor(dnew.v, div[0].v); |
| 386 |
< |
addcolor(dnew.v, ar.rcol); |
| 387 |
< |
dnew.n = div[0].n + 1; |
| 388 |
< |
dnew.t = div[0].t; dnew.p = div[0].p; |
| 389 |
< |
b2 = bright(dnew.v)/dnew.n - bright(ar.rcol); |
| 390 |
< |
b2 = b2*b2 + div[0].k*(div[0].n*div[0].n); |
| 391 |
< |
dnew.k = b2/(dnew.n*dnew.n); |
| 392 |
< |
/* reinsert */ |
| 393 |
< |
for (k = 0; k < ne-1 && dnew.k < div[k+1].k; k++) |
| 394 |
< |
copystruct(&div[k], &div[k+1]); |
| 395 |
< |
copystruct(&div[k], &dnew); |
| 396 |
< |
|
| 397 |
< |
if (ne >= i) { /* extract darkest division */ |
| 398 |
< |
ne--; |
| 399 |
< |
if (div[ne].n > 1) |
| 400 |
< |
scalecolor(div[ne].v, 1.0/div[ne].n); |
| 401 |
< |
addcolor(acol, div[ne].v); |
| 402 |
< |
} |
| 403 |
< |
} |
| 404 |
< |
scalecolor(acol, 1.0/ndivs); |
| 405 |
< |
if (arad <= FTINY) |
| 406 |
< |
arad = FHUGE; |
| 407 |
< |
else |
| 408 |
< |
arad = (ndivs+ns) / arad / sqrt(r->rweight); |
| 409 |
< |
if (arad > maxarad) |
| 410 |
< |
arad = maxarad; |
| 411 |
< |
else if (arad < minarad) |
| 412 |
< |
arad = minarad; |
| 413 |
< |
if (ns > 0) |
| 414 |
< |
free((char *)div); |
| 415 |
< |
return(arad); |
| 416 |
< |
} |
| 417 |
< |
|
| 418 |
< |
|
| 419 |
< |
static int |
| 420 |
< |
ambcmp(d1, d2) /* decreasing order */ |
| 421 |
< |
AMBSAMP *d1, *d2; |
| 422 |
< |
{ |
| 423 |
< |
if (d1->k < d2->k) |
| 424 |
< |
return(1); |
| 425 |
< |
if (d1->k > d2->k) |
| 426 |
< |
return(-1); |
| 427 |
< |
return(0); |
| 272 |
> |
copycolor(cr, ap->val); |
| 273 |
> |
scalecolor(cr, d); |
| 274 |
|
} |
| 275 |
|
|
| 276 |
|
|
