8 |
|
* for Irradiance Caching" by Schwarzhaupt, Wann Jensen, & Jarosz |
9 |
|
* from ACM SIGGRAPH Asia 2012 conference proceedings. |
10 |
|
* |
11 |
+ |
* Added book-keeping optimization to avoid calculations that would |
12 |
+ |
* cancel due to traversal both directions on edges that are adjacent |
13 |
+ |
* to same-valued triangles. This cuts about half of Hessian math. |
14 |
+ |
* |
15 |
|
* Declarations of external symbols in ambient.h |
16 |
|
*/ |
17 |
|
|
25 |
|
|
26 |
|
extern void SDsquare2disk(double ds[2], double seedx, double seedy); |
27 |
|
|
28 |
+ |
/* vertex direction bit positions */ |
29 |
+ |
#define VDB_xy 0 |
30 |
+ |
#define VDB_y 01 |
31 |
+ |
#define VDB_x 02 |
32 |
+ |
#define VDB_Xy 03 |
33 |
+ |
#define VDB_xY 04 |
34 |
+ |
#define VDB_X 05 |
35 |
+ |
#define VDB_Y 06 |
36 |
+ |
#define VDB_XY 07 |
37 |
+ |
/* get opposite vertex direction bit */ |
38 |
+ |
#define VDB_OPP(f) (~(f) & 07) |
39 |
+ |
/* adjacent triangle vertex flags */ |
40 |
+ |
static const int adjacent_trifl[8] = { |
41 |
+ |
0, /* forbidden diagonal */ |
42 |
+ |
1<<VDB_x|1<<VDB_y|1<<VDB_Xy, |
43 |
+ |
1<<VDB_y|1<<VDB_x|1<<VDB_xY, |
44 |
+ |
1<<VDB_y|1<<VDB_Xy|1<<VDB_X, |
45 |
+ |
1<<VDB_x|1<<VDB_xY|1<<VDB_Y, |
46 |
+ |
1<<VDB_Xy|1<<VDB_X|1<<VDB_Y, |
47 |
+ |
1<<VDB_xY|1<<VDB_Y|1<<VDB_X, |
48 |
+ |
0, /* forbidden diagonal */ |
49 |
+ |
}; |
50 |
+ |
|
51 |
|
typedef struct { |
52 |
+ |
COLOR v; /* hemisphere sample value */ |
53 |
+ |
float d; /* reciprocal distance (1/rt) */ |
54 |
+ |
FVECT p; /* intersection point */ |
55 |
+ |
} AMBSAMP; /* sample value */ |
56 |
+ |
|
57 |
+ |
typedef struct { |
58 |
|
RAY *rp; /* originating ray sample */ |
59 |
|
FVECT ux, uy; /* tangent axis unit vectors */ |
60 |
|
int ns; /* number of samples per axis */ |
61 |
|
COLOR acoef; /* division contribution coefficient */ |
62 |
< |
struct s_ambsamp { |
30 |
< |
COLOR v; /* hemisphere sample value */ |
31 |
< |
FVECT p; /* intersection point */ |
32 |
< |
} sa[1]; /* sample array (extends struct) */ |
62 |
> |
AMBSAMP sa[1]; /* sample array (extends struct) */ |
63 |
|
} AMBHEMI; /* ambient sample hemisphere */ |
64 |
|
|
65 |
< |
#define ambsamp(h,i,j) (h)->sa[(i)*(h)->ns + (j)] |
65 |
> |
#define ambndx(h,i,j) ((i)*(h)->ns + (j)) |
66 |
> |
#define ambsam(h,i,j) (h)->sa[ambndx(h,i,j)] |
67 |
|
|
68 |
|
typedef struct { |
69 |
|
FVECT r_i, r_i1, e_i, rcp, rI2_eJ2; |
70 |
|
double I1, I2; |
71 |
+ |
int valid; |
72 |
|
} FFTRI; /* vectors and coefficients for Hessian calculation */ |
73 |
|
|
74 |
|
|
75 |
+ |
/* Get index for adjacent vertex */ |
76 |
+ |
static int |
77 |
+ |
adjacent_verti(AMBHEMI *hp, int i, int j, int dbit) |
78 |
+ |
{ |
79 |
+ |
int i0 = i*hp->ns + j; |
80 |
+ |
|
81 |
+ |
switch (dbit) { |
82 |
+ |
case VDB_y: return(i0 - hp->ns); |
83 |
+ |
case VDB_x: return(i0 - 1); |
84 |
+ |
case VDB_Xy: return(i0 - hp->ns + 1); |
85 |
+ |
case VDB_xY: return(i0 + hp->ns - 1); |
86 |
+ |
case VDB_X: return(i0 + 1); |
87 |
+ |
case VDB_Y: return(i0 + hp->ns); |
88 |
+ |
/* the following should never occur */ |
89 |
+ |
case VDB_xy: return(i0 - hp->ns - 1); |
90 |
+ |
case VDB_XY: return(i0 + hp->ns + 1); |
91 |
+ |
} |
92 |
+ |
return(-1); |
93 |
+ |
} |
94 |
+ |
|
95 |
+ |
|
96 |
+ |
/* Get vertex direction bit for the opposite edge to complete triangle */ |
97 |
+ |
static int |
98 |
+ |
vdb_edge(int db1, int db2) |
99 |
+ |
{ |
100 |
+ |
switch (db1) { |
101 |
+ |
case VDB_x: return(db2==VDB_y ? VDB_Xy : VDB_Y); |
102 |
+ |
case VDB_y: return(db2==VDB_x ? VDB_xY : VDB_X); |
103 |
+ |
case VDB_X: return(db2==VDB_Xy ? VDB_y : VDB_xY); |
104 |
+ |
case VDB_Y: return(db2==VDB_xY ? VDB_x : VDB_Xy); |
105 |
+ |
case VDB_xY: return(db2==VDB_x ? VDB_y : VDB_X); |
106 |
+ |
case VDB_Xy: return(db2==VDB_y ? VDB_x : VDB_Y); |
107 |
+ |
} |
108 |
+ |
error(INTERNAL, "forbidden diagonal in vdb_edge()"); |
109 |
+ |
return(-1); |
110 |
+ |
} |
111 |
+ |
|
112 |
+ |
|
113 |
|
static AMBHEMI * |
114 |
|
inithemi( /* initialize sampling hemisphere */ |
115 |
|
COLOR ac, |
129 |
|
if (n < i) |
130 |
|
n = i; |
131 |
|
/* allocate sampling array */ |
132 |
< |
hp = (AMBHEMI *)malloc(sizeof(AMBHEMI) + |
63 |
< |
sizeof(struct s_ambsamp)*(n*n - 1)); |
132 |
> |
hp = (AMBHEMI *)malloc(sizeof(AMBHEMI) + sizeof(AMBSAMP)*(n*n - 1)); |
133 |
|
if (hp == NULL) |
134 |
|
return(NULL); |
135 |
|
hp->rp = r; |
156 |
|
} |
157 |
|
|
158 |
|
|
159 |
< |
static struct s_ambsamp * |
160 |
< |
ambsample( /* sample an ambient direction */ |
161 |
< |
AMBHEMI *hp, |
93 |
< |
int i, |
94 |
< |
int j |
95 |
< |
) |
159 |
> |
/* Sample ambient division and apply weighting coefficient */ |
160 |
> |
static int |
161 |
> |
getambsamp(RAY *arp, AMBHEMI *hp, int i, int j, int n) |
162 |
|
{ |
163 |
< |
struct s_ambsamp *ap = &ambsamp(hp,i,j); |
164 |
< |
RAY ar; |
99 |
< |
double spt[2], zd; |
100 |
< |
int ii; |
163 |
> |
int hlist[3], ii; |
164 |
> |
double spt[2], zd; |
165 |
|
/* ambient coefficient for weight */ |
166 |
|
if (ambacc > FTINY) |
167 |
< |
setcolor(ar.rcoef, AVGREFL, AVGREFL, AVGREFL); |
167 |
> |
setcolor(arp->rcoef, AVGREFL, AVGREFL, AVGREFL); |
168 |
|
else |
169 |
< |
copycolor(ar.rcoef, hp->acoef); |
170 |
< |
if (rayorigin(&ar, AMBIENT, hp->rp, ar.rcoef) < 0) |
171 |
< |
goto badsample; |
169 |
> |
copycolor(arp->rcoef, hp->acoef); |
170 |
> |
if (rayorigin(arp, AMBIENT, hp->rp, arp->rcoef) < 0) |
171 |
> |
return(0); |
172 |
|
if (ambacc > FTINY) { |
173 |
< |
multcolor(ar.rcoef, hp->acoef); |
174 |
< |
scalecolor(ar.rcoef, 1./AVGREFL); |
173 |
> |
multcolor(arp->rcoef, hp->acoef); |
174 |
> |
scalecolor(arp->rcoef, 1./AVGREFL); |
175 |
|
} |
176 |
< |
/* generate hemispherical sample */ |
177 |
< |
SDsquare2disk(spt, (i+.1+.8*frandom())/hp->ns, |
178 |
< |
(j+.1+.8*frandom())/hp->ns ); |
176 |
> |
hlist[0] = hp->rp->rno; |
177 |
> |
hlist[1] = j; |
178 |
> |
hlist[2] = i; |
179 |
> |
multisamp(spt, 2, urand(ilhash(hlist,3)+n)); |
180 |
> |
if (!n) { /* avoid border samples for n==0 */ |
181 |
> |
if ((spt[0] < 0.1) | (spt[0] >= 0.9)) |
182 |
> |
spt[0] = 0.1 + 0.8*frandom(); |
183 |
> |
if ((spt[1] < 0.1) | (spt[1] >= 0.9)) |
184 |
> |
spt[1] = 0.1 + 0.8*frandom(); |
185 |
> |
} |
186 |
> |
SDsquare2disk(spt, (j+spt[1])/hp->ns, (i+spt[0])/hp->ns); |
187 |
|
zd = sqrt(1. - spt[0]*spt[0] - spt[1]*spt[1]); |
188 |
|
for (ii = 3; ii--; ) |
189 |
< |
ar.rdir[ii] = spt[0]*hp->ux[ii] + |
189 |
> |
arp->rdir[ii] = spt[0]*hp->ux[ii] + |
190 |
|
spt[1]*hp->uy[ii] + |
191 |
|
zd*hp->rp->ron[ii]; |
192 |
< |
checknorm(ar.rdir); |
193 |
< |
dimlist[ndims++] = i*hp->ns + j + 90171; |
194 |
< |
rayvalue(&ar); /* evaluate ray */ |
195 |
< |
ndims--; |
196 |
< |
/* limit vertex distance */ |
192 |
> |
checknorm(arp->rdir); |
193 |
> |
dimlist[ndims++] = ambndx(hp,i,j) + 90171; |
194 |
> |
rayvalue(arp); /* evaluate ray */ |
195 |
> |
ndims--; /* apply coefficient */ |
196 |
> |
multcolor(arp->rcol, arp->rcoef); |
197 |
> |
return(1); |
198 |
> |
} |
199 |
> |
|
200 |
> |
|
201 |
> |
static AMBSAMP * |
202 |
> |
ambsample( /* initial ambient division sample */ |
203 |
> |
AMBHEMI *hp, |
204 |
> |
int i, |
205 |
> |
int j |
206 |
> |
) |
207 |
> |
{ |
208 |
> |
AMBSAMP *ap = &ambsam(hp,i,j); |
209 |
> |
RAY ar; |
210 |
> |
/* generate hemispherical sample */ |
211 |
> |
if (!getambsamp(&ar, hp, i, j, 0) || ar.rt <= FTINY) { |
212 |
> |
memset(ap, 0, sizeof(AMBSAMP)); |
213 |
> |
return(NULL); |
214 |
> |
} |
215 |
> |
ap->d = 1.0/ar.rt; /* limit vertex distance */ |
216 |
|
if (ar.rt > 10.0*thescene.cusize) |
217 |
|
ar.rt = 10.0*thescene.cusize; |
127 |
– |
else if (ar.rt <= FTINY) /* should never happen! */ |
128 |
– |
goto badsample; |
218 |
|
VSUM(ap->p, ar.rorg, ar.rdir, ar.rt); |
130 |
– |
multcolor(ar.rcol, ar.rcoef); /* apply coefficient */ |
219 |
|
copycolor(ap->v, ar.rcol); |
220 |
|
return(ap); |
133 |
– |
badsample: |
134 |
– |
setcolor(ap->v, 0., 0., 0.); |
135 |
– |
VCOPY(ap->p, hp->rp->rop); |
136 |
– |
return(NULL); |
221 |
|
} |
222 |
|
|
223 |
|
|
224 |
+ |
/* Estimate errors based on ambient division differences */ |
225 |
+ |
static float * |
226 |
+ |
getambdiffs(AMBHEMI *hp) |
227 |
+ |
{ |
228 |
+ |
float *earr = (float *)calloc(hp->ns*hp->ns, sizeof(float)); |
229 |
+ |
float *ep; |
230 |
+ |
AMBSAMP *ap; |
231 |
+ |
double b, d2; |
232 |
+ |
int i, j; |
233 |
+ |
|
234 |
+ |
if (earr == NULL) /* out of memory? */ |
235 |
+ |
return(NULL); |
236 |
+ |
/* compute squared neighbor diffs */ |
237 |
+ |
for (ap = hp->sa, ep = earr, i = 0; i < hp->ns; i++) |
238 |
+ |
for (j = 0; j < hp->ns; j++, ap++, ep++) { |
239 |
+ |
b = bright(ap[0].v); |
240 |
+ |
if (i) { /* from above */ |
241 |
+ |
d2 = b - bright(ap[-hp->ns].v); |
242 |
+ |
d2 *= d2; |
243 |
+ |
ep[0] += d2; |
244 |
+ |
ep[-hp->ns] += d2; |
245 |
+ |
} |
246 |
+ |
if (j) { /* from behind */ |
247 |
+ |
d2 = b - bright(ap[-1].v); |
248 |
+ |
d2 *= d2; |
249 |
+ |
ep[0] += d2; |
250 |
+ |
ep[-1] += d2; |
251 |
+ |
} |
252 |
+ |
} |
253 |
+ |
/* correct for number of neighbors */ |
254 |
+ |
earr[0] *= 2.f; |
255 |
+ |
earr[hp->ns-1] *= 2.f; |
256 |
+ |
earr[(hp->ns-1)*hp->ns] *= 2.f; |
257 |
+ |
earr[(hp->ns-1)*hp->ns + hp->ns-1] *= 2.f; |
258 |
+ |
for (i = 1; i < hp->ns-1; i++) { |
259 |
+ |
earr[i*hp->ns] *= 4./3.; |
260 |
+ |
earr[i*hp->ns + hp->ns-1] *= 4./3.; |
261 |
+ |
} |
262 |
+ |
for (j = 1; j < hp->ns-1; j++) { |
263 |
+ |
earr[j] *= 4./3.; |
264 |
+ |
earr[(hp->ns-1)*hp->ns + j] *= 4./3.; |
265 |
+ |
} |
266 |
+ |
return(earr); |
267 |
+ |
} |
268 |
+ |
|
269 |
+ |
|
270 |
+ |
/* Perform super-sampling on hemisphere (introduces bias) */ |
271 |
+ |
static void |
272 |
+ |
ambsupersamp(double acol[3], AMBHEMI *hp, int cnt) |
273 |
+ |
{ |
274 |
+ |
float *earr = getambdiffs(hp); |
275 |
+ |
double e2sum = 0.0; |
276 |
+ |
AMBSAMP *ap; |
277 |
+ |
RAY ar; |
278 |
+ |
double asum[3]; |
279 |
+ |
float *ep; |
280 |
+ |
int i, j, n; |
281 |
+ |
|
282 |
+ |
if (earr == NULL) /* just skip calc. if no memory */ |
283 |
+ |
return; |
284 |
+ |
/* add up estimated variances */ |
285 |
+ |
for (ep = earr + hp->ns*hp->ns; ep-- > earr; ) |
286 |
+ |
e2sum += *ep; |
287 |
+ |
ep = earr; /* perform super-sampling */ |
288 |
+ |
for (ap = hp->sa, i = 0; i < hp->ns; i++) |
289 |
+ |
for (j = 0; j < hp->ns; j++, ap++) { |
290 |
+ |
int nss = *ep/e2sum*cnt + frandom(); |
291 |
+ |
asum[0] = asum[1] = asum[2] = 0.0; |
292 |
+ |
for (n = 1; n <= nss; n++) { |
293 |
+ |
if (!getambsamp(&ar, hp, i, j, n)) { |
294 |
+ |
nss = n-1; |
295 |
+ |
break; |
296 |
+ |
} |
297 |
+ |
addcolor(asum, ar.rcol); |
298 |
+ |
} |
299 |
+ |
if (nss) { /* update returned ambient value */ |
300 |
+ |
const double ssf = 1./(nss + 1); |
301 |
+ |
for (n = 3; n--; ) |
302 |
+ |
acol[n] += ssf*asum[n] + |
303 |
+ |
(ssf - 1.)*colval(ap->v,n); |
304 |
+ |
} |
305 |
+ |
e2sum -= *ep++; /* update remainders */ |
306 |
+ |
cnt -= nss; |
307 |
+ |
} |
308 |
+ |
free(earr); |
309 |
+ |
} |
310 |
+ |
|
311 |
+ |
|
312 |
+ |
/* Compute vertex flags, indicating farthest in each direction */ |
313 |
+ |
static uby8 * |
314 |
+ |
vertex_flags(AMBHEMI *hp) |
315 |
+ |
{ |
316 |
+ |
uby8 *vflags = (uby8 *)calloc(hp->ns*hp->ns, sizeof(uby8)); |
317 |
+ |
uby8 *vf; |
318 |
+ |
AMBSAMP *ap; |
319 |
+ |
int i, j; |
320 |
+ |
|
321 |
+ |
if (vflags == NULL) |
322 |
+ |
error(SYSTEM, "out of memory in vertex_flags()"); |
323 |
+ |
vf = vflags; |
324 |
+ |
ap = hp->sa; /* compute farthest along first row */ |
325 |
+ |
for (j = 0; j < hp->ns-1; j++, vf++, ap++) |
326 |
+ |
if (ap[0].d <= ap[1].d) |
327 |
+ |
vf[0] |= 1<<VDB_X; |
328 |
+ |
else |
329 |
+ |
vf[1] |= 1<<VDB_x; |
330 |
+ |
++vf; ++ap; |
331 |
+ |
/* flag subsequent rows */ |
332 |
+ |
for (i = 1; i < hp->ns; i++) { |
333 |
+ |
for (j = 0; j < hp->ns-1; j++, vf++, ap++) { |
334 |
+ |
if (ap[0].d <= ap[-hp->ns].d) /* row before */ |
335 |
+ |
vf[0] |= 1<<VDB_y; |
336 |
+ |
else |
337 |
+ |
vf[-hp->ns] |= 1<<VDB_Y; |
338 |
+ |
if (ap[0].d <= ap[1-hp->ns].d) /* diagonal we care about */ |
339 |
+ |
vf[0] |= 1<<VDB_Xy; |
340 |
+ |
else |
341 |
+ |
vf[1-hp->ns] |= 1<<VDB_xY; |
342 |
+ |
if (ap[0].d <= ap[1].d) /* column after */ |
343 |
+ |
vf[0] |= 1<<VDB_X; |
344 |
+ |
else |
345 |
+ |
vf[1] |= 1<<VDB_x; |
346 |
+ |
} |
347 |
+ |
if (ap[0].d <= ap[-hp->ns].d) /* final column edge */ |
348 |
+ |
vf[0] |= 1<<VDB_y; |
349 |
+ |
else |
350 |
+ |
vf[-hp->ns] |= 1<<VDB_Y; |
351 |
+ |
++vf; ++ap; |
352 |
+ |
} |
353 |
+ |
return(vflags); |
354 |
+ |
} |
355 |
+ |
|
356 |
+ |
|
357 |
+ |
/* Return brightness of farthest ambient sample */ |
358 |
+ |
static double |
359 |
+ |
back_ambval(AMBHEMI *hp, int i, int j, int dbit1, int dbit2, const uby8 *vflags) |
360 |
+ |
{ |
361 |
+ |
const int v0 = ambndx(hp,i,j); |
362 |
+ |
const int tflags = (1<<dbit1 | 1<<dbit2); |
363 |
+ |
int v1, v2; |
364 |
+ |
|
365 |
+ |
if ((vflags[v0] & tflags) == tflags) /* is v0 the farthest? */ |
366 |
+ |
return(colval(hp->sa[v0].v,CIEY)); |
367 |
+ |
v1 = adjacent_verti(hp, i, j, dbit1); |
368 |
+ |
if (vflags[v0] & 1<<dbit2) /* v1 farthest if v0>v2 */ |
369 |
+ |
return(colval(hp->sa[v1].v,CIEY)); |
370 |
+ |
v2 = adjacent_verti(hp, i, j, dbit2); |
371 |
+ |
if (vflags[v0] & 1<<dbit1) /* v2 farthest if v0>v1 */ |
372 |
+ |
return(colval(hp->sa[v2].v,CIEY)); |
373 |
+ |
/* else check if v1>v2 */ |
374 |
+ |
if (vflags[v1] & 1<<vdb_edge(dbit1,dbit2)) |
375 |
+ |
return(colval(hp->sa[v1].v,CIEY)); |
376 |
+ |
return(colval(hp->sa[v2].v,CIEY)); |
377 |
+ |
} |
378 |
+ |
|
379 |
+ |
|
380 |
|
/* Compute vectors and coefficients for Hessian/gradient calcs */ |
381 |
|
static void |
382 |
< |
comp_fftri(FFTRI *ftp, FVECT ap0, FVECT ap1, FVECT rop) |
382 |
> |
comp_fftri(FFTRI *ftp, AMBHEMI *hp, int i, int j, int dbit, const uby8 *vflags) |
383 |
|
{ |
384 |
< |
double rdot_cp, dot_e, dot_er, rdot_r, rdot_r1, J2; |
385 |
< |
int i; |
384 |
> |
const int i0 = ambndx(hp,i,j); |
385 |
> |
double rdot_cp, dot_e, dot_er, rdot_r, rdot_r1, J2; |
386 |
> |
int i1, ii; |
387 |
|
|
388 |
< |
VSUB(ftp->r_i, ap0, rop); |
389 |
< |
VSUB(ftp->r_i1, ap1, rop); |
390 |
< |
VSUB(ftp->e_i, ap1, ap0); |
388 |
> |
ftp->valid = 0; /* check if we can skip this edge */ |
389 |
> |
ii = adjacent_trifl[dbit]; |
390 |
> |
if ((vflags[i0] & ii) == ii) /* cancels if vertex used as value */ |
391 |
> |
return; |
392 |
> |
i1 = adjacent_verti(hp, i, j, dbit); |
393 |
> |
ii = adjacent_trifl[VDB_OPP(dbit)]; |
394 |
> |
if ((vflags[i1] & ii) == ii) /* on either end (for both triangles) */ |
395 |
> |
return; |
396 |
> |
/* else go ahead with calculation */ |
397 |
> |
VSUB(ftp->r_i, hp->sa[i0].p, hp->rp->rop); |
398 |
> |
VSUB(ftp->r_i1, hp->sa[i1].p, hp->rp->rop); |
399 |
> |
VSUB(ftp->e_i, hp->sa[i1].p, hp->sa[i0].p); |
400 |
|
VCROSS(ftp->rcp, ftp->r_i, ftp->r_i1); |
401 |
|
rdot_cp = 1.0/DOT(ftp->rcp,ftp->rcp); |
402 |
|
dot_e = DOT(ftp->e_i,ftp->e_i); |
408 |
|
ftp->I2 = ( DOT(ftp->e_i, ftp->r_i1)*rdot_r1 - dot_er*rdot_r + |
409 |
|
dot_e*ftp->I1 )*0.5*rdot_cp; |
410 |
|
J2 = ( 0.5*(rdot_r - rdot_r1) - dot_er*ftp->I2 ) / dot_e; |
411 |
< |
for (i = 3; i--; ) |
412 |
< |
ftp->rI2_eJ2[i] = ftp->I2*ftp->r_i[i] + J2*ftp->e_i[i]; |
411 |
> |
for (ii = 3; ii--; ) |
412 |
> |
ftp->rI2_eJ2[ii] = ftp->I2*ftp->r_i[ii] + J2*ftp->e_i[ii]; |
413 |
> |
ftp->valid++; |
414 |
|
} |
415 |
|
|
416 |
|
|
436 |
|
double d1, d2, d3, d4; |
437 |
|
double I3, J3, K3; |
438 |
|
int i, j; |
439 |
+ |
|
440 |
+ |
if (!ftp->valid) { /* preemptive test */ |
441 |
+ |
memset(hess, 0, sizeof(FVECT)*3); |
442 |
+ |
return; |
443 |
+ |
} |
444 |
|
/* compute intermediate coefficients */ |
445 |
|
d1 = 1.0/DOT(ftp->r_i,ftp->r_i); |
446 |
|
d2 = 1.0/DOT(ftp->r_i1,ftp->r_i1); |
464 |
|
hess[i][j] = m1[i][j] + d1*( I3*m2[i][j] + K3*m3[i][j] + |
465 |
|
2.0*J3*m4[i][j] ); |
466 |
|
hess[i][j] += d2*(i==j); |
467 |
< |
hess[i][j] *= 1.0/PI; |
467 |
> |
hess[i][j] *= -1.0/PI; |
468 |
|
} |
469 |
|
} |
470 |
|
|
486 |
|
/* Add to radiometric Hessian from the given triangle */ |
487 |
|
static void |
488 |
|
add2hessian(FVECT hess[3], FVECT ehess1[3], |
489 |
< |
FVECT ehess2[3], FVECT ehess3[3], COLORV v) |
489 |
> |
FVECT ehess2[3], FVECT ehess3[3], double v) |
490 |
|
{ |
491 |
|
int i, j; |
492 |
|
|
504 |
|
double f1; |
505 |
|
int i; |
506 |
|
|
507 |
+ |
if (!ftp->valid) { /* preemptive test */ |
508 |
+ |
memset(grad, 0, sizeof(FVECT)); |
509 |
+ |
return; |
510 |
+ |
} |
511 |
|
f1 = 2.0*DOT(nrm, ftp->rcp); |
512 |
|
VCROSS(ncp, nrm, ftp->e_i); |
513 |
|
for (i = 3; i--; ) |
514 |
< |
grad[i] = (-0.5/PI)*( ftp->I1*ncp[i] + f1*ftp->rI2_eJ2[i] ); |
514 |
> |
grad[i] = (0.5/PI)*( ftp->I1*ncp[i] + f1*ftp->rI2_eJ2[i] ); |
515 |
|
} |
516 |
|
|
517 |
|
|
527 |
|
|
528 |
|
/* Add to displacement gradient from the given triangle */ |
529 |
|
static void |
530 |
< |
add2gradient(FVECT grad, FVECT egrad1, FVECT egrad2, FVECT egrad3, COLORV v) |
530 |
> |
add2gradient(FVECT grad, FVECT egrad1, FVECT egrad2, FVECT egrad3, double v) |
531 |
|
{ |
532 |
|
int i; |
533 |
|
|
536 |
|
} |
537 |
|
|
538 |
|
|
279 |
– |
/* Return brightness of furthest ambient sample */ |
280 |
– |
static COLORV |
281 |
– |
back_ambval(struct s_ambsamp *ap1, struct s_ambsamp *ap2, |
282 |
– |
struct s_ambsamp *ap3, FVECT orig) |
283 |
– |
{ |
284 |
– |
COLORV vback; |
285 |
– |
FVECT vec; |
286 |
– |
double d2, d2best; |
287 |
– |
|
288 |
– |
VSUB(vec, ap1->p, orig); |
289 |
– |
d2best = DOT(vec,vec); |
290 |
– |
vback = colval(ap1->v,CIEY); |
291 |
– |
VSUB(vec, ap2->p, orig); |
292 |
– |
d2 = DOT(vec,vec); |
293 |
– |
if (d2 > d2best) { |
294 |
– |
d2best = d2; |
295 |
– |
vback = colval(ap2->v,CIEY); |
296 |
– |
} |
297 |
– |
VSUB(vec, ap3->p, orig); |
298 |
– |
d2 = DOT(vec,vec); |
299 |
– |
if (d2 > d2best) |
300 |
– |
return(colval(ap3->v,CIEY)); |
301 |
– |
return(vback); |
302 |
– |
} |
303 |
– |
|
304 |
– |
|
539 |
|
/* Compute anisotropic radii and eigenvector directions */ |
540 |
|
static int |
541 |
|
eigenvectors(FVECT uv[2], float ra[2], FVECT hessian[3]) |
596 |
|
static char memerrmsg[] = "out of memory in ambHessian()"; |
597 |
|
FVECT (*hessrow)[3] = NULL; |
598 |
|
FVECT *gradrow = NULL; |
599 |
+ |
uby8 *vflags; |
600 |
|
FVECT hessian[3]; |
601 |
|
FVECT gradient; |
602 |
|
FFTRI fftr; |
618 |
|
error(SYSTEM, memerrmsg); |
619 |
|
memset(gradient, 0, sizeof(gradient)); |
620 |
|
} |
621 |
+ |
/* get vertex position flags */ |
622 |
+ |
vflags = vertex_flags(hp); |
623 |
|
/* compute first row of edges */ |
624 |
|
for (j = 0; j < hp->ns-1; j++) { |
625 |
< |
comp_fftri(&fftr, ambsamp(hp,0,j).p, |
389 |
< |
ambsamp(hp,0,j+1).p, hp->rp->rop); |
625 |
> |
comp_fftri(&fftr, hp, 0, j, VDB_X, vflags); |
626 |
|
if (hessrow != NULL) |
627 |
|
comp_hessian(hessrow[j], &fftr, hp->rp->ron); |
628 |
|
if (gradrow != NULL) |
632 |
|
for (i = 0; i < hp->ns-1; i++) { |
633 |
|
FVECT hesscol[3]; /* compute first vertical edge */ |
634 |
|
FVECT gradcol; |
635 |
< |
comp_fftri(&fftr, ambsamp(hp,i,0).p, |
400 |
< |
ambsamp(hp,i+1,0).p, hp->rp->rop); |
635 |
> |
comp_fftri(&fftr, hp, i, 0, VDB_Y, vflags); |
636 |
|
if (hessrow != NULL) |
637 |
|
comp_hessian(hesscol, &fftr, hp->rp->ron); |
638 |
|
if (gradrow != NULL) |
640 |
|
for (j = 0; j < hp->ns-1; j++) { |
641 |
|
FVECT hessdia[3]; /* compute triangle contributions */ |
642 |
|
FVECT graddia; |
643 |
< |
COLORV backg; |
644 |
< |
backg = back_ambval(&ambsamp(hp,i,j), &ambsamp(hp,i,j+1), |
410 |
< |
&ambsamp(hp,i+1,j), hp->rp->rop); |
643 |
> |
double backg; |
644 |
> |
backg = back_ambval(hp, i, j, VDB_X, VDB_Y, vflags); |
645 |
|
/* diagonal (inner) edge */ |
646 |
< |
comp_fftri(&fftr, ambsamp(hp,i,j+1).p, |
413 |
< |
ambsamp(hp,i+1,j).p, hp->rp->rop); |
646 |
> |
comp_fftri(&fftr, hp, i, j+1, VDB_xY, vflags); |
647 |
|
if (hessrow != NULL) { |
648 |
|
comp_hessian(hessdia, &fftr, hp->rp->ron); |
649 |
|
rev_hessian(hesscol); |
655 |
|
add2gradient(gradient, gradrow[j], graddia, gradcol, backg); |
656 |
|
} |
657 |
|
/* initialize edge in next row */ |
658 |
< |
comp_fftri(&fftr, ambsamp(hp,i+1,j+1).p, |
426 |
< |
ambsamp(hp,i+1,j).p, hp->rp->rop); |
658 |
> |
comp_fftri(&fftr, hp, i+1, j+1, VDB_x, vflags); |
659 |
|
if (hessrow != NULL) |
660 |
|
comp_hessian(hessrow[j], &fftr, hp->rp->ron); |
661 |
|
if (gradrow != NULL) |
662 |
|
comp_gradient(gradrow[j], &fftr, hp->rp->ron); |
663 |
|
/* new column edge & paired triangle */ |
664 |
< |
backg = back_ambval(&ambsamp(hp,i,j+1), &ambsamp(hp,i+1,j+1), |
665 |
< |
&ambsamp(hp,i+1,j), hp->rp->rop); |
434 |
< |
comp_fftri(&fftr, ambsamp(hp,i,j+1).p, ambsamp(hp,i+1,j+1).p, |
435 |
< |
hp->rp->rop); |
664 |
> |
backg = back_ambval(hp, i+1, j+1, VDB_x, VDB_y, vflags); |
665 |
> |
comp_fftri(&fftr, hp, i, j+1, VDB_Y, vflags); |
666 |
|
if (hessrow != NULL) { |
667 |
|
comp_hessian(hesscol, &fftr, hp->rp->ron); |
668 |
|
rev_hessian(hessdia); |
682 |
|
/* release row buffers */ |
683 |
|
if (hessrow != NULL) free(hessrow); |
684 |
|
if (gradrow != NULL) free(gradrow); |
685 |
+ |
free(vflags); |
686 |
|
|
687 |
|
if (ra != NULL) /* extract eigenvectors & radii */ |
688 |
|
eigenvectors(uv, ra, hessian); |
697 |
|
static void |
698 |
|
ambdirgrad(AMBHEMI *hp, FVECT uv[2], float dg[2]) |
699 |
|
{ |
700 |
< |
struct s_ambsamp *ap; |
701 |
< |
double dgsum[2]; |
702 |
< |
int n; |
703 |
< |
FVECT vd; |
704 |
< |
double gfact; |
700 |
> |
AMBSAMP *ap; |
701 |
> |
double dgsum[2]; |
702 |
> |
int n; |
703 |
> |
FVECT vd; |
704 |
> |
double gfact; |
705 |
|
|
706 |
|
dgsum[0] = dgsum[1] = 0.0; /* sum values times -tan(theta) */ |
707 |
|
for (ap = hp->sa, n = hp->ns*hp->ns; n--; ap++) { |
718 |
|
} |
719 |
|
|
720 |
|
|
721 |
+ |
/* Compute potential light leak direction flags for cache value */ |
722 |
+ |
static uint32 |
723 |
+ |
ambcorral(AMBHEMI *hp, FVECT uv[2], const double r0, const double r1) |
724 |
+ |
{ |
725 |
+ |
const double max_d = 1.0/(minarad*ambacc + 0.001); |
726 |
+ |
const double ang_res = 0.5*PI/(hp->ns-1); |
727 |
+ |
const double ang_step = ang_res/((int)(16/PI*ang_res) + (1+FTINY)); |
728 |
+ |
uint32 flgs = 0; |
729 |
+ |
int i, j; |
730 |
+ |
/* circle around perimeter */ |
731 |
+ |
for (i = 0; i < hp->ns; i++) |
732 |
+ |
for (j = 0; j < hp->ns; j += !i|(i==hp->ns-1) ? 1 : hp->ns-1) { |
733 |
+ |
AMBSAMP *ap = &ambsam(hp,i,j); |
734 |
+ |
FVECT vec; |
735 |
+ |
double u, v; |
736 |
+ |
double ang, a1; |
737 |
+ |
int abp; |
738 |
+ |
if ((ap->d <= FTINY) | (ap->d >= max_d)) |
739 |
+ |
continue; /* too far or too near */ |
740 |
+ |
VSUB(vec, ap->p, hp->rp->rop); |
741 |
+ |
u = DOT(vec, uv[0]) * ap->d; |
742 |
+ |
v = DOT(vec, uv[1]) * ap->d; |
743 |
+ |
if ((r0*r0*u*u + r1*r1*v*v) * ap->d*ap->d <= 1.0) |
744 |
+ |
continue; /* occluder outside ellipse */ |
745 |
+ |
ang = atan2a(v, u); /* else set direction flags */ |
746 |
+ |
for (a1 = ang-.5*ang_res; a1 <= ang+.5*ang_res; a1 += ang_step) |
747 |
+ |
flgs |= 1L<<(int)(16/PI*(a1 + 2.*PI*(a1 < 0))); |
748 |
+ |
} |
749 |
+ |
return(flgs); |
750 |
+ |
} |
751 |
+ |
|
752 |
+ |
|
753 |
|
int |
754 |
|
doambient( /* compute ambient component */ |
755 |
|
COLOR rcol, /* input/output color */ |
758 |
|
FVECT uv[2], /* returned (optional) */ |
759 |
|
float ra[2], /* returned (optional) */ |
760 |
|
float pg[2], /* returned (optional) */ |
761 |
< |
float dg[2] /* returned (optional) */ |
761 |
> |
float dg[2], /* returned (optional) */ |
762 |
> |
uint32 *crlp /* returned (optional) */ |
763 |
|
) |
764 |
|
{ |
765 |
< |
AMBHEMI *hp = inithemi(rcol, r, wt); |
766 |
< |
int cnt = 0; |
767 |
< |
FVECT my_uv[2]; |
768 |
< |
double d, K, acol[3]; |
769 |
< |
struct s_ambsamp *ap; |
770 |
< |
int i, j; |
765 |
> |
AMBHEMI *hp = inithemi(rcol, r, wt); |
766 |
> |
int cnt; |
767 |
> |
FVECT my_uv[2]; |
768 |
> |
double d, K, acol[3]; |
769 |
> |
AMBSAMP *ap; |
770 |
> |
int i, j; |
771 |
|
/* check/initialize */ |
772 |
|
if (hp == NULL) |
773 |
|
return(0); |
779 |
|
pg[0] = pg[1] = 0.0; |
780 |
|
if (dg != NULL) |
781 |
|
dg[0] = dg[1] = 0.0; |
782 |
+ |
if (crlp != NULL) |
783 |
+ |
*crlp = 0; |
784 |
|
/* sample the hemisphere */ |
785 |
|
acol[0] = acol[1] = acol[2] = 0.0; |
786 |
+ |
cnt = 0; |
787 |
|
for (i = hp->ns; i--; ) |
788 |
|
for (j = hp->ns; j--; ) |
789 |
|
if ((ap = ambsample(hp, i, j)) != NULL) { |
795 |
|
free(hp); |
796 |
|
return(0); /* no valid samples */ |
797 |
|
} |
798 |
+ |
if (cnt < hp->ns*hp->ns) { /* incomplete sampling? */ |
799 |
+ |
copycolor(rcol, acol); |
800 |
+ |
free(hp); |
801 |
+ |
return(-1); /* return value w/o Hessian */ |
802 |
+ |
} |
803 |
+ |
cnt = ambssamp*wt + 0.5; /* perform super-sampling? */ |
804 |
+ |
if (cnt > 8) |
805 |
+ |
ambsupersamp(acol, hp, cnt); |
806 |
|
copycolor(rcol, acol); /* final indirect irradiance/PI */ |
807 |
< |
if (cnt < hp->ns*hp->ns || /* incomplete sampling? */ |
533 |
< |
(ra == NULL) & (pg == NULL) & (dg == NULL)) { |
807 |
> |
if ((ra == NULL) & (pg == NULL) & (dg == NULL)) { |
808 |
|
free(hp); |
809 |
|
return(-1); /* no radius or gradient calc. */ |
810 |
|
} |
811 |
< |
if (bright(acol) > FTINY) { /* normalize Y values */ |
812 |
< |
d = 0.99*cnt/bright(acol); |
811 |
> |
if ((d = bright(acol)) > FTINY) { /* normalize Y values */ |
812 |
> |
d = 0.99*(hp->ns*hp->ns)/d; |
813 |
|
K = 0.01; |
814 |
< |
} else { /* geometric Hessian fall-back */ |
541 |
< |
d = 0.0; |
814 |
> |
} else { /* or fall back on geometric Hessian */ |
815 |
|
K = 1.0; |
816 |
|
pg = NULL; |
817 |
|
dg = NULL; |
850 |
|
if (ra[0] > maxarad) |
851 |
|
ra[0] = maxarad; |
852 |
|
} |
853 |
+ |
if (crlp != NULL) /* flag encroached directions */ |
854 |
+ |
*crlp = ambcorral(hp, uv, ra[0]*ambacc, ra[1]*ambacc); |
855 |
|
if (pg != NULL) { /* cap gradient if necessary */ |
856 |
|
d = pg[0]*pg[0]*ra[0]*ra[0] + pg[1]*pg[1]*ra[1]*ra[1]; |
857 |
|
if (d > 1.0) { |