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 |
– |
|
28 |
|
typedef struct { |
29 |
|
COLOR v; /* hemisphere sample value */ |
30 |
|
float d; /* reciprocal distance (1/rt) */ |
33 |
|
|
34 |
|
typedef struct { |
35 |
|
RAY *rp; /* originating ray sample */ |
59 |
– |
FVECT ux, uy; /* tangent axis unit vectors */ |
36 |
|
int ns; /* number of samples per axis */ |
37 |
+ |
int sampOK; /* acquired full sample set? */ |
38 |
|
COLOR acoef; /* division contribution coefficient */ |
39 |
+ |
double acol[3]; /* accumulated color */ |
40 |
+ |
FVECT ux, uy; /* tangent axis unit vectors */ |
41 |
|
AMBSAMP sa[1]; /* sample array (extends struct) */ |
42 |
|
} AMBHEMI; /* ambient sample hemisphere */ |
43 |
|
|
44 |
< |
#define ambndx(h,i,j) ((i)*(h)->ns + (j)) |
45 |
< |
#define ambsam(h,i,j) (h)->sa[ambndx(h,i,j)] |
44 |
> |
#define AI(h,i,j) ((i)*(h)->ns + (j)) |
45 |
> |
#define ambsam(h,i,j) (h)->sa[AI(h,i,j)] |
46 |
|
|
47 |
|
typedef struct { |
48 |
|
FVECT r_i, r_i1, e_i, rcp, rI2_eJ2; |
49 |
|
double I1, I2; |
71 |
– |
int valid; |
50 |
|
} FFTRI; /* vectors and coefficients for Hessian calculation */ |
51 |
|
|
52 |
|
|
75 |
– |
/* Get index for adjacent vertex */ |
53 |
|
static int |
54 |
< |
adjacent_verti(AMBHEMI *hp, int i, int j, int dbit) |
55 |
< |
{ |
56 |
< |
int i0 = i*hp->ns + j; |
57 |
< |
|
58 |
< |
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, |
116 |
< |
RAY *r, |
117 |
< |
double wt |
54 |
> |
ambsample( /* initial ambient division sample */ |
55 |
> |
AMBHEMI *hp, |
56 |
> |
int i, |
57 |
> |
int j, |
58 |
> |
int n |
59 |
|
) |
60 |
|
{ |
61 |
< |
AMBHEMI *hp; |
62 |
< |
double d; |
122 |
< |
int n, i; |
123 |
< |
/* set number of divisions */ |
124 |
< |
if (ambacc <= FTINY && |
125 |
< |
wt > (d = 0.8*intens(ac)*r->rweight/(ambdiv*minweight))) |
126 |
< |
wt = d; /* avoid ray termination */ |
127 |
< |
n = sqrt(ambdiv * wt) + 0.5; |
128 |
< |
i = 1 + 5*(ambacc > FTINY); /* minimum number of samples */ |
129 |
< |
if (n < i) |
130 |
< |
n = i; |
131 |
< |
/* allocate sampling array */ |
132 |
< |
hp = (AMBHEMI *)malloc(sizeof(AMBHEMI) + sizeof(AMBSAMP)*(n*n - 1)); |
133 |
< |
if (hp == NULL) |
134 |
< |
return(NULL); |
135 |
< |
hp->rp = r; |
136 |
< |
hp->ns = n; |
137 |
< |
/* assign coefficient */ |
138 |
< |
copycolor(hp->acoef, ac); |
139 |
< |
d = 1.0/(n*n); |
140 |
< |
scalecolor(hp->acoef, d); |
141 |
< |
/* make tangent plane axes */ |
142 |
< |
hp->uy[0] = 0.5 - frandom(); |
143 |
< |
hp->uy[1] = 0.5 - frandom(); |
144 |
< |
hp->uy[2] = 0.5 - frandom(); |
145 |
< |
for (i = 3; i--; ) |
146 |
< |
if ((-0.6 < r->ron[i]) & (r->ron[i] < 0.6)) |
147 |
< |
break; |
148 |
< |
if (i < 0) |
149 |
< |
error(CONSISTENCY, "bad ray direction in inithemi"); |
150 |
< |
hp->uy[i] = 1.0; |
151 |
< |
VCROSS(hp->ux, hp->uy, r->ron); |
152 |
< |
normalize(hp->ux); |
153 |
< |
VCROSS(hp->uy, r->ron, hp->ux); |
154 |
< |
/* we're ready to sample */ |
155 |
< |
return(hp); |
156 |
< |
} |
157 |
< |
|
158 |
< |
|
159 |
< |
/* Sample ambient division and apply weighting coefficient */ |
160 |
< |
static int |
161 |
< |
getambsamp(RAY *arp, AMBHEMI *hp, int i, int j, int n) |
162 |
< |
{ |
61 |
> |
AMBSAMP *ap = &ambsam(hp,i,j); |
62 |
> |
RAY ar; |
63 |
|
int hlist[3], ii; |
64 |
|
double spt[2], zd; |
65 |
+ |
/* generate hemispherical sample */ |
66 |
|
/* ambient coefficient for weight */ |
67 |
|
if (ambacc > FTINY) |
68 |
< |
setcolor(arp->rcoef, AVGREFL, AVGREFL, AVGREFL); |
68 |
> |
setcolor(ar.rcoef, AVGREFL, AVGREFL, AVGREFL); |
69 |
|
else |
70 |
< |
copycolor(arp->rcoef, hp->acoef); |
71 |
< |
if (rayorigin(arp, AMBIENT, hp->rp, arp->rcoef) < 0) |
70 |
> |
copycolor(ar.rcoef, hp->acoef); |
71 |
> |
if (rayorigin(&ar, AMBIENT, hp->rp, ar.rcoef) < 0) |
72 |
|
return(0); |
73 |
|
if (ambacc > FTINY) { |
74 |
< |
multcolor(arp->rcoef, hp->acoef); |
75 |
< |
scalecolor(arp->rcoef, 1./AVGREFL); |
74 |
> |
multcolor(ar.rcoef, hp->acoef); |
75 |
> |
scalecolor(ar.rcoef, 1./AVGREFL); |
76 |
|
} |
77 |
|
hlist[0] = hp->rp->rno; |
78 |
|
hlist[1] = j; |
87 |
|
SDsquare2disk(spt, (j+spt[1])/hp->ns, (i+spt[0])/hp->ns); |
88 |
|
zd = sqrt(1. - spt[0]*spt[0] - spt[1]*spt[1]); |
89 |
|
for (ii = 3; ii--; ) |
90 |
< |
arp->rdir[ii] = spt[0]*hp->ux[ii] + |
90 |
> |
ar.rdir[ii] = spt[0]*hp->ux[ii] + |
91 |
|
spt[1]*hp->uy[ii] + |
92 |
|
zd*hp->rp->ron[ii]; |
93 |
< |
checknorm(arp->rdir); |
94 |
< |
dimlist[ndims++] = ambndx(hp,i,j) + 90171; |
95 |
< |
rayvalue(arp); /* evaluate ray */ |
96 |
< |
ndims--; /* apply coefficient */ |
97 |
< |
multcolor(arp->rcol, arp->rcoef); |
93 |
> |
checknorm(ar.rdir); |
94 |
> |
dimlist[ndims++] = AI(hp,i,j) + 90171; |
95 |
> |
rayvalue(&ar); /* evaluate ray */ |
96 |
> |
ndims--; |
97 |
> |
if (ar.rt <= FTINY) |
98 |
> |
return(0); /* should never happen */ |
99 |
> |
multcolor(ar.rcol, ar.rcoef); /* apply coefficient */ |
100 |
> |
if (ar.rt*ap->d < 1.0) /* new/closer distance? */ |
101 |
> |
ap->d = 1.0/ar.rt; |
102 |
> |
if (!n) { /* record first vertex & value */ |
103 |
> |
if (ar.rt > 10.0*thescene.cusize) |
104 |
> |
ar.rt = 10.0*thescene.cusize; |
105 |
> |
VSUM(ap->p, ar.rorg, ar.rdir, ar.rt); |
106 |
> |
copycolor(ap->v, ar.rcol); |
107 |
> |
} else { /* else update recorded value */ |
108 |
> |
hp->acol[RED] -= colval(ap->v,RED); |
109 |
> |
hp->acol[GRN] -= colval(ap->v,GRN); |
110 |
> |
hp->acol[BLU] -= colval(ap->v,BLU); |
111 |
> |
zd = 1.0/(double)(n+1); |
112 |
> |
scalecolor(ar.rcol, zd); |
113 |
> |
zd *= (double)n; |
114 |
> |
scalecolor(ap->v, zd); |
115 |
> |
addcolor(ap->v, ar.rcol); |
116 |
> |
} |
117 |
> |
addcolor(hp->acol, ap->v); /* add to our sum */ |
118 |
|
return(1); |
119 |
|
} |
120 |
|
|
121 |
|
|
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; |
218 |
– |
VSUM(ap->p, ar.rorg, ar.rdir, ar.rt); |
219 |
– |
copycolor(ap->v, ar.rcol); |
220 |
– |
return(ap); |
221 |
– |
} |
222 |
– |
|
223 |
– |
|
122 |
|
/* Estimate errors based on ambient division differences */ |
123 |
|
static float * |
124 |
|
getambdiffs(AMBHEMI *hp) |
141 |
|
ep[0] += d2; |
142 |
|
ep[-hp->ns] += d2; |
143 |
|
} |
144 |
< |
if (j) { /* from behind */ |
145 |
< |
d2 = b - bright(ap[-1].v); |
146 |
< |
d2 *= d2; |
147 |
< |
ep[0] += d2; |
148 |
< |
ep[-1] += d2; |
149 |
< |
} |
144 |
> |
if (!j) continue; |
145 |
> |
/* from behind */ |
146 |
> |
d2 = b - bright(ap[-1].v); |
147 |
> |
d2 *= d2; |
148 |
> |
ep[0] += d2; |
149 |
> |
ep[-1] += d2; |
150 |
> |
if (!i) continue; |
151 |
> |
/* diagonal */ |
152 |
> |
d2 = b - bright(ap[-hp->ns-1].v); |
153 |
> |
d2 *= d2; |
154 |
> |
ep[0] += d2; |
155 |
> |
ep[-hp->ns-1] += d2; |
156 |
|
} |
157 |
|
/* correct for number of neighbors */ |
158 |
< |
earr[0] *= 2.f; |
159 |
< |
earr[hp->ns-1] *= 2.f; |
160 |
< |
earr[(hp->ns-1)*hp->ns] *= 2.f; |
161 |
< |
earr[(hp->ns-1)*hp->ns + hp->ns-1] *= 2.f; |
158 |
> |
earr[0] *= 8./3.; |
159 |
> |
earr[hp->ns-1] *= 8./3.; |
160 |
> |
earr[(hp->ns-1)*hp->ns] *= 8./3.; |
161 |
> |
earr[(hp->ns-1)*hp->ns + hp->ns-1] *= 8./3.; |
162 |
|
for (i = 1; i < hp->ns-1; i++) { |
163 |
< |
earr[i*hp->ns] *= 4./3.; |
164 |
< |
earr[i*hp->ns + hp->ns-1] *= 4./3.; |
163 |
> |
earr[i*hp->ns] *= 8./5.; |
164 |
> |
earr[i*hp->ns + hp->ns-1] *= 8./5.; |
165 |
|
} |
166 |
|
for (j = 1; j < hp->ns-1; j++) { |
167 |
< |
earr[j] *= 4./3.; |
168 |
< |
earr[(hp->ns-1)*hp->ns + j] *= 4./3.; |
167 |
> |
earr[j] *= 8./5.; |
168 |
> |
earr[(hp->ns-1)*hp->ns + j] *= 8./5.; |
169 |
|
} |
170 |
|
return(earr); |
171 |
|
} |
173 |
|
|
174 |
|
/* Perform super-sampling on hemisphere (introduces bias) */ |
175 |
|
static void |
176 |
< |
ambsupersamp(double acol[3], AMBHEMI *hp, int cnt) |
176 |
> |
ambsupersamp(AMBHEMI *hp, int cnt) |
177 |
|
{ |
178 |
|
float *earr = getambdiffs(hp); |
179 |
< |
double e2sum = 0.0; |
179 |
> |
double e2rem = 0; |
180 |
|
AMBSAMP *ap; |
181 |
|
RAY ar; |
278 |
– |
double asum[3]; |
182 |
|
float *ep; |
183 |
< |
int i, j, n; |
183 |
> |
int i, j, n, nss; |
184 |
|
|
185 |
|
if (earr == NULL) /* just skip calc. if no memory */ |
186 |
|
return; |
187 |
< |
/* add up estimated variances */ |
188 |
< |
for (ep = earr + hp->ns*hp->ns; ep-- > earr; ) |
189 |
< |
e2sum += *ep; |
187 |
> |
/* accumulate estimated variances */ |
188 |
> |
for (ep = earr + hp->ns*hp->ns; ep > earr; ) |
189 |
> |
e2rem += *--ep; |
190 |
|
ep = earr; /* perform super-sampling */ |
191 |
|
for (ap = hp->sa, i = 0; i < hp->ns; i++) |
192 |
|
for (j = 0; j < hp->ns; j++, ap++) { |
193 |
< |
int nss = *ep/e2sum*cnt + frandom(); |
194 |
< |
asum[0] = asum[1] = asum[2] = 0.0; |
195 |
< |
for (n = 1; n <= nss; n++) { |
196 |
< |
if (!getambsamp(&ar, hp, i, j, n)) { |
197 |
< |
nss = n-1; |
198 |
< |
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; |
193 |
> |
if (e2rem <= FTINY) |
194 |
> |
goto done; /* nothing left to do */ |
195 |
> |
nss = *ep/e2rem*cnt + frandom(); |
196 |
> |
for (n = 1; n <= nss && ambsample(hp,i,j,n); n++) |
197 |
> |
--cnt; |
198 |
> |
e2rem -= *ep++; /* update remainder */ |
199 |
|
} |
200 |
+ |
done: |
201 |
|
free(earr); |
202 |
|
} |
203 |
|
|
204 |
|
|
205 |
< |
/* Compute vertex flags, indicating farthest in each direction */ |
206 |
< |
static uby8 * |
207 |
< |
vertex_flags(AMBHEMI *hp) |
205 |
> |
static AMBHEMI * |
206 |
> |
samp_hemi( /* sample indirect hemisphere */ |
207 |
> |
COLOR rcol, |
208 |
> |
RAY *r, |
209 |
> |
double wt |
210 |
> |
) |
211 |
|
{ |
212 |
< |
uby8 *vflags = (uby8 *)calloc(hp->ns*hp->ns, sizeof(uby8)); |
213 |
< |
uby8 *vf; |
214 |
< |
AMBSAMP *ap; |
215 |
< |
int i, j; |
216 |
< |
|
217 |
< |
if (vflags == NULL) |
218 |
< |
error(SYSTEM, "out of memory in vertex_flags()"); |
219 |
< |
vf = vflags; |
220 |
< |
ap = hp->sa; /* compute farthest along first row */ |
221 |
< |
for (j = 0; j < hp->ns-1; j++, vf++, ap++) |
222 |
< |
if (ap[0].d <= ap[1].d) |
223 |
< |
vf[0] |= 1<<VDB_X; |
224 |
< |
else |
225 |
< |
vf[1] |= 1<<VDB_x; |
226 |
< |
++vf; ++ap; |
227 |
< |
/* flag subsequent rows */ |
228 |
< |
for (i = 1; i < hp->ns; i++) { |
229 |
< |
for (j = 0; j < hp->ns-1; j++, vf++, ap++) { |
230 |
< |
if (ap[0].d <= ap[-hp->ns].d) /* row before */ |
231 |
< |
vf[0] |= 1<<VDB_y; |
232 |
< |
else |
233 |
< |
vf[-hp->ns] |= 1<<VDB_Y; |
234 |
< |
if (ap[0].d <= ap[1-hp->ns].d) /* diagonal we care about */ |
235 |
< |
vf[0] |= 1<<VDB_Xy; |
236 |
< |
else |
237 |
< |
vf[1-hp->ns] |= 1<<VDB_xY; |
238 |
< |
if (ap[0].d <= ap[1].d) /* column after */ |
239 |
< |
vf[0] |= 1<<VDB_X; |
240 |
< |
else |
241 |
< |
vf[1] |= 1<<VDB_x; |
242 |
< |
} |
243 |
< |
if (ap[0].d <= ap[-hp->ns].d) /* final column edge */ |
244 |
< |
vf[0] |= 1<<VDB_y; |
245 |
< |
else |
246 |
< |
vf[-hp->ns] |= 1<<VDB_Y; |
247 |
< |
++vf; ++ap; |
212 |
> |
AMBHEMI *hp; |
213 |
> |
double d; |
214 |
> |
int n, i, j; |
215 |
> |
/* set number of divisions */ |
216 |
> |
if (ambacc <= FTINY && |
217 |
> |
wt > (d = 0.8*intens(rcol)*r->rweight/(ambdiv*minweight))) |
218 |
> |
wt = d; /* avoid ray termination */ |
219 |
> |
n = sqrt(ambdiv * wt) + 0.5; |
220 |
> |
i = 1 + 5*(ambacc > FTINY); /* minimum number of samples */ |
221 |
> |
if (n < i) |
222 |
> |
n = i; |
223 |
> |
/* allocate sampling array */ |
224 |
> |
hp = (AMBHEMI *)malloc(sizeof(AMBHEMI) + sizeof(AMBSAMP)*(n*n - 1)); |
225 |
> |
if (hp == NULL) |
226 |
> |
error(SYSTEM, "out of memory in samp_hemi"); |
227 |
> |
hp->rp = r; |
228 |
> |
hp->ns = n; |
229 |
> |
hp->acol[RED] = hp->acol[GRN] = hp->acol[BLU] = 0.0; |
230 |
> |
memset(hp->sa, 0, sizeof(AMBSAMP)*n*n); |
231 |
> |
hp->sampOK = 0; |
232 |
> |
/* assign coefficient */ |
233 |
> |
copycolor(hp->acoef, rcol); |
234 |
> |
d = 1.0/(n*n); |
235 |
> |
scalecolor(hp->acoef, d); |
236 |
> |
/* make tangent plane axes */ |
237 |
> |
hp->uy[0] = 0.5 - frandom(); |
238 |
> |
hp->uy[1] = 0.5 - frandom(); |
239 |
> |
hp->uy[2] = 0.5 - frandom(); |
240 |
> |
for (i = 3; i--; ) |
241 |
> |
if ((-0.6 < r->ron[i]) & (r->ron[i] < 0.6)) |
242 |
> |
break; |
243 |
> |
if (i < 0) |
244 |
> |
error(CONSISTENCY, "bad ray direction in samp_hemi"); |
245 |
> |
hp->uy[i] = 1.0; |
246 |
> |
VCROSS(hp->ux, hp->uy, r->ron); |
247 |
> |
normalize(hp->ux); |
248 |
> |
VCROSS(hp->uy, r->ron, hp->ux); |
249 |
> |
/* sample divisions */ |
250 |
> |
for (i = hp->ns; i--; ) |
251 |
> |
for (j = hp->ns; j--; ) |
252 |
> |
hp->sampOK += ambsample(hp, i, j, 0); |
253 |
> |
copycolor(rcol, hp->acol); |
254 |
> |
if (!hp->sampOK) { /* utter failure? */ |
255 |
> |
free(hp); |
256 |
> |
return(NULL); |
257 |
|
} |
258 |
< |
return(vflags); |
258 |
> |
if (hp->sampOK < hp->ns*hp->ns) { |
259 |
> |
hp->sampOK *= -1; /* soft failure */ |
260 |
> |
return(hp); |
261 |
> |
} |
262 |
> |
n = ambssamp*wt + 0.5; |
263 |
> |
if (n > 8) { /* perform super-sampling? */ |
264 |
> |
ambsupersamp(hp, n); |
265 |
> |
copycolor(rcol, hp->acol); |
266 |
> |
} |
267 |
> |
return(hp); /* all is well */ |
268 |
|
} |
269 |
|
|
270 |
|
|
271 |
|
/* Return brightness of farthest ambient sample */ |
272 |
|
static double |
273 |
< |
back_ambval(AMBHEMI *hp, int i, int j, int dbit1, int dbit2, const uby8 *vflags) |
273 |
> |
back_ambval(AMBHEMI *hp, const int n1, const int n2, const int n3) |
274 |
|
{ |
275 |
< |
const int v0 = ambndx(hp,i,j); |
276 |
< |
const int tflags = (1<<dbit1 | 1<<dbit2); |
277 |
< |
int v1, v2; |
278 |
< |
|
279 |
< |
if ((vflags[v0] & tflags) == tflags) /* is v0 the farthest? */ |
280 |
< |
return(colval(hp->sa[v0].v,CIEY)); |
281 |
< |
v1 = adjacent_verti(hp, i, j, dbit1); |
282 |
< |
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)); |
275 |
> |
if (hp->sa[n1].d <= hp->sa[n2].d) { |
276 |
> |
if (hp->sa[n1].d <= hp->sa[n3].d) |
277 |
> |
return(colval(hp->sa[n1].v,CIEY)); |
278 |
> |
return(colval(hp->sa[n3].v,CIEY)); |
279 |
> |
} |
280 |
> |
if (hp->sa[n2].d <= hp->sa[n3].d) |
281 |
> |
return(colval(hp->sa[n2].v,CIEY)); |
282 |
> |
return(colval(hp->sa[n3].v,CIEY)); |
283 |
|
} |
284 |
|
|
285 |
|
|
286 |
|
/* Compute vectors and coefficients for Hessian/gradient calcs */ |
287 |
|
static void |
288 |
< |
comp_fftri(FFTRI *ftp, AMBHEMI *hp, int i, int j, int dbit, const uby8 *vflags) |
288 |
> |
comp_fftri(FFTRI *ftp, AMBHEMI *hp, const int n0, const int n1) |
289 |
|
{ |
290 |
< |
const int i0 = ambndx(hp,i,j); |
291 |
< |
double rdot_cp, dot_e, dot_er, rdot_r, rdot_r1, J2; |
386 |
< |
int i1, ii; |
290 |
> |
double rdot_cp, dot_e, dot_er, rdot_r, rdot_r1, J2; |
291 |
> |
int ii; |
292 |
|
|
293 |
< |
ftp->valid = 0; /* check if we can skip this edge */ |
294 |
< |
ii = adjacent_trifl[dbit]; |
295 |
< |
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); |
293 |
> |
VSUB(ftp->r_i, hp->sa[n0].p, hp->rp->rop); |
294 |
> |
VSUB(ftp->r_i1, hp->sa[n1].p, hp->rp->rop); |
295 |
> |
VSUB(ftp->e_i, hp->sa[n1].p, hp->sa[n0].p); |
296 |
|
VCROSS(ftp->rcp, ftp->r_i, ftp->r_i1); |
297 |
|
rdot_cp = 1.0/DOT(ftp->rcp,ftp->rcp); |
298 |
|
dot_e = DOT(ftp->e_i,ftp->e_i); |
306 |
|
J2 = ( 0.5*(rdot_r - rdot_r1) - dot_er*ftp->I2 ) / dot_e; |
307 |
|
for (ii = 3; ii--; ) |
308 |
|
ftp->rI2_eJ2[ii] = ftp->I2*ftp->r_i[ii] + J2*ftp->e_i[ii]; |
413 |
– |
ftp->valid++; |
309 |
|
} |
310 |
|
|
311 |
|
|
331 |
|
double d1, d2, d3, d4; |
332 |
|
double I3, J3, K3; |
333 |
|
int i, j; |
439 |
– |
|
440 |
– |
if (!ftp->valid) { /* preemptive test */ |
441 |
– |
memset(hess, 0, sizeof(FVECT)*3); |
442 |
– |
return; |
443 |
– |
} |
334 |
|
/* compute intermediate coefficients */ |
335 |
|
d1 = 1.0/DOT(ftp->r_i,ftp->r_i); |
336 |
|
d2 = 1.0/DOT(ftp->r_i1,ftp->r_i1); |
394 |
|
double f1; |
395 |
|
int i; |
396 |
|
|
507 |
– |
if (!ftp->valid) { /* preemptive test */ |
508 |
– |
memset(grad, 0, sizeof(FVECT)); |
509 |
– |
return; |
510 |
– |
} |
397 |
|
f1 = 2.0*DOT(nrm, ftp->rcp); |
398 |
|
VCROSS(ncp, nrm, ftp->e_i); |
399 |
|
for (i = 3; i--; ) |
423 |
|
|
424 |
|
|
425 |
|
/* Compute anisotropic radii and eigenvector directions */ |
426 |
< |
static int |
426 |
> |
static void |
427 |
|
eigenvectors(FVECT uv[2], float ra[2], FVECT hessian[3]) |
428 |
|
{ |
429 |
|
double hess2[2][2]; |
445 |
|
if (i == 1) /* double-root (circle) */ |
446 |
|
evalue[1] = evalue[0]; |
447 |
|
if (!i || ((evalue[0] = fabs(evalue[0])) <= FTINY*FTINY) | |
448 |
< |
((evalue[1] = fabs(evalue[1])) <= FTINY*FTINY) ) |
449 |
< |
error(INTERNAL, "bad eigenvalue calculation"); |
450 |
< |
|
448 |
> |
((evalue[1] = fabs(evalue[1])) <= FTINY*FTINY) ) { |
449 |
> |
ra[0] = ra[1] = maxarad; |
450 |
> |
return; |
451 |
> |
} |
452 |
|
if (evalue[0] > evalue[1]) { |
453 |
|
ra[0] = sqrt(sqrt(4.0/evalue[0])); |
454 |
|
ra[1] = sqrt(sqrt(4.0/evalue[1])); |
483 |
|
static char memerrmsg[] = "out of memory in ambHessian()"; |
484 |
|
FVECT (*hessrow)[3] = NULL; |
485 |
|
FVECT *gradrow = NULL; |
599 |
– |
uby8 *vflags; |
486 |
|
FVECT hessian[3]; |
487 |
|
FVECT gradient; |
488 |
|
FFTRI fftr; |
504 |
|
error(SYSTEM, memerrmsg); |
505 |
|
memset(gradient, 0, sizeof(gradient)); |
506 |
|
} |
621 |
– |
/* get vertex position flags */ |
622 |
– |
vflags = vertex_flags(hp); |
507 |
|
/* compute first row of edges */ |
508 |
|
for (j = 0; j < hp->ns-1; j++) { |
509 |
< |
comp_fftri(&fftr, hp, 0, j, VDB_X, vflags); |
509 |
> |
comp_fftri(&fftr, hp, AI(hp,0,j), AI(hp,0,j+1)); |
510 |
|
if (hessrow != NULL) |
511 |
|
comp_hessian(hessrow[j], &fftr, hp->rp->ron); |
512 |
|
if (gradrow != NULL) |
516 |
|
for (i = 0; i < hp->ns-1; i++) { |
517 |
|
FVECT hesscol[3]; /* compute first vertical edge */ |
518 |
|
FVECT gradcol; |
519 |
< |
comp_fftri(&fftr, hp, i, 0, VDB_Y, vflags); |
519 |
> |
comp_fftri(&fftr, hp, AI(hp,i,0), AI(hp,i+1,0)); |
520 |
|
if (hessrow != NULL) |
521 |
|
comp_hessian(hesscol, &fftr, hp->rp->ron); |
522 |
|
if (gradrow != NULL) |
525 |
|
FVECT hessdia[3]; /* compute triangle contributions */ |
526 |
|
FVECT graddia; |
527 |
|
double backg; |
528 |
< |
backg = back_ambval(hp, i, j, VDB_X, VDB_Y, vflags); |
528 |
> |
backg = back_ambval(hp, AI(hp,i,j), |
529 |
> |
AI(hp,i,j+1), AI(hp,i+1,j)); |
530 |
|
/* diagonal (inner) edge */ |
531 |
< |
comp_fftri(&fftr, hp, i, j+1, VDB_xY, vflags); |
531 |
> |
comp_fftri(&fftr, hp, AI(hp,i,j+1), AI(hp,i+1,j)); |
532 |
|
if (hessrow != NULL) { |
533 |
|
comp_hessian(hessdia, &fftr, hp->rp->ron); |
534 |
|
rev_hessian(hesscol); |
540 |
|
add2gradient(gradient, gradrow[j], graddia, gradcol, backg); |
541 |
|
} |
542 |
|
/* initialize edge in next row */ |
543 |
< |
comp_fftri(&fftr, hp, i+1, j+1, VDB_x, vflags); |
543 |
> |
comp_fftri(&fftr, hp, AI(hp,i+1,j+1), AI(hp,i+1,j)); |
544 |
|
if (hessrow != NULL) |
545 |
|
comp_hessian(hessrow[j], &fftr, hp->rp->ron); |
546 |
|
if (gradrow != NULL) |
547 |
|
comp_gradient(gradrow[j], &fftr, hp->rp->ron); |
548 |
|
/* new column edge & paired triangle */ |
549 |
< |
backg = back_ambval(hp, i+1, j+1, VDB_x, VDB_y, vflags); |
550 |
< |
comp_fftri(&fftr, hp, i, j+1, VDB_Y, vflags); |
549 |
> |
backg = back_ambval(hp, AI(hp,i+1,j+1), |
550 |
> |
AI(hp,i+1,j), AI(hp,i,j+1)); |
551 |
> |
comp_fftri(&fftr, hp, AI(hp,i,j+1), AI(hp,i+1,j+1)); |
552 |
|
if (hessrow != NULL) { |
553 |
|
comp_hessian(hesscol, &fftr, hp->rp->ron); |
554 |
|
rev_hessian(hessdia); |
568 |
|
/* release row buffers */ |
569 |
|
if (hessrow != NULL) free(hessrow); |
570 |
|
if (gradrow != NULL) free(gradrow); |
685 |
– |
free(vflags); |
571 |
|
|
572 |
|
if (ra != NULL) /* extract eigenvectors & radii */ |
573 |
|
eigenvectors(uv, ra, hessian); |
612 |
|
const double ang_step = ang_res/((int)(16/PI*ang_res) + (1+FTINY)); |
613 |
|
double avg_d = 0; |
614 |
|
uint32 flgs = 0; |
615 |
+ |
FVECT vec; |
616 |
+ |
double u, v; |
617 |
+ |
double ang, a1; |
618 |
|
int i, j; |
619 |
< |
/* check distances above us */ |
619 |
> |
/* don't bother for a few samples */ |
620 |
> |
if (hp->ns < 12) |
621 |
> |
return(0); |
622 |
> |
/* check distances overhead */ |
623 |
|
for (i = hp->ns*3/4; i-- > hp->ns>>2; ) |
624 |
|
for (j = hp->ns*3/4; j-- > hp->ns>>2; ) |
625 |
|
avg_d += ambsam(hp,i,j).d; |
626 |
|
avg_d *= 4.0/(hp->ns*hp->ns); |
627 |
< |
if (avg_d >= max_d) /* too close to corral? */ |
627 |
> |
if (avg_d*r0 >= 1.0) /* ceiling too low for corral? */ |
628 |
|
return(0); |
629 |
+ |
if (avg_d >= max_d) /* insurance */ |
630 |
+ |
return(0); |
631 |
|
/* else circle around perimeter */ |
632 |
|
for (i = 0; i < hp->ns; i++) |
633 |
|
for (j = 0; j < hp->ns; j += !i|(i==hp->ns-1) ? 1 : hp->ns-1) { |
634 |
|
AMBSAMP *ap = &ambsam(hp,i,j); |
742 |
– |
FVECT vec; |
743 |
– |
double u, v; |
744 |
– |
double ang, a1; |
745 |
– |
int abp; |
635 |
|
if ((ap->d <= FTINY) | (ap->d >= max_d)) |
636 |
|
continue; /* too far or too near */ |
637 |
|
VSUB(vec, ap->p, hp->rp->rop); |
638 |
< |
u = DOT(vec, uv[0]) * ap->d; |
639 |
< |
v = DOT(vec, uv[1]) * ap->d; |
640 |
< |
if ((r0*r0*u*u + r1*r1*v*v) * ap->d*ap->d <= 1.0) |
638 |
> |
u = DOT(vec, uv[0]); |
639 |
> |
v = DOT(vec, uv[1]); |
640 |
> |
if ((r0*r0*u*u + r1*r1*v*v) * ap->d*ap->d <= u*u + v*v) |
641 |
|
continue; /* occluder outside ellipse */ |
642 |
|
ang = atan2a(v, u); /* else set direction flags */ |
643 |
|
for (a1 = ang-.5*ang_res; a1 <= ang+.5*ang_res; a1 += ang_step) |
644 |
|
flgs |= 1L<<(int)(16/PI*(a1 + 2.*PI*(a1 < 0))); |
645 |
|
} |
646 |
+ |
/* add low-angle incident (< 20deg) */ |
647 |
+ |
if (fabs(hp->rp->rod) <= 0.342) { |
648 |
+ |
u = -DOT(hp->rp->rdir, uv[0]); |
649 |
+ |
v = -DOT(hp->rp->rdir, uv[1]); |
650 |
+ |
if ((r0*r0*u*u + r1*r1*v*v) > hp->rp->rot*hp->rp->rot) { |
651 |
+ |
ang = atan2a(v, u); |
652 |
+ |
ang += 2.*PI*(ang < 0); |
653 |
+ |
ang *= 16/PI; |
654 |
+ |
if ((ang < .5) | (ang >= 31.5)) |
655 |
+ |
flgs |= 0x80000001; |
656 |
+ |
else |
657 |
+ |
flgs |= 3L<<(int)(ang-.5); |
658 |
+ |
} |
659 |
+ |
} |
660 |
|
return(flgs); |
661 |
|
} |
662 |
|
|
673 |
|
uint32 *crlp /* returned (optional) */ |
674 |
|
) |
675 |
|
{ |
676 |
< |
AMBHEMI *hp = inithemi(rcol, r, wt); |
774 |
< |
int cnt; |
676 |
> |
AMBHEMI *hp = samp_hemi(rcol, r, wt); |
677 |
|
FVECT my_uv[2]; |
678 |
< |
double d, K, acol[3]; |
678 |
> |
double d, K; |
679 |
|
AMBSAMP *ap; |
680 |
< |
int i, j; |
681 |
< |
/* check/initialize */ |
780 |
< |
if (hp == NULL) |
781 |
< |
return(0); |
680 |
> |
int i; |
681 |
> |
/* clear return values */ |
682 |
|
if (uv != NULL) |
683 |
|
memset(uv, 0, sizeof(FVECT)*2); |
684 |
|
if (ra != NULL) |
689 |
|
dg[0] = dg[1] = 0.0; |
690 |
|
if (crlp != NULL) |
691 |
|
*crlp = 0; |
692 |
< |
/* sample the hemisphere */ |
693 |
< |
acol[0] = acol[1] = acol[2] = 0.0; |
694 |
< |
cnt = 0; |
695 |
< |
for (i = hp->ns; i--; ) |
696 |
< |
for (j = hp->ns; j--; ) |
697 |
< |
if ((ap = ambsample(hp, i, j)) != NULL) { |
698 |
< |
addcolor(acol, ap->v); |
799 |
< |
++cnt; |
800 |
< |
} |
801 |
< |
if (!cnt) { |
802 |
< |
setcolor(rcol, 0.0, 0.0, 0.0); |
803 |
< |
free(hp); |
804 |
< |
return(0); /* no valid samples */ |
692 |
> |
if (hp == NULL) /* sampling falure? */ |
693 |
> |
return(0); |
694 |
> |
|
695 |
> |
if ((ra == NULL) & (pg == NULL) & (dg == NULL) || |
696 |
> |
(hp->sampOK < 0) | (hp->ns < 4)) { |
697 |
> |
free(hp); /* Hessian not requested/possible */ |
698 |
> |
return(-1); /* value-only return value */ |
699 |
|
} |
700 |
< |
if (cnt < hp->ns*hp->ns) { /* incomplete sampling? */ |
807 |
< |
copycolor(rcol, acol); |
808 |
< |
free(hp); |
809 |
< |
return(-1); /* return value w/o Hessian */ |
810 |
< |
} |
811 |
< |
cnt = ambssamp*wt + 0.5; /* perform super-sampling? */ |
812 |
< |
if (cnt > 8) |
813 |
< |
ambsupersamp(acol, hp, cnt); |
814 |
< |
copycolor(rcol, acol); /* final indirect irradiance/PI */ |
815 |
< |
if ((ra == NULL) & (pg == NULL) & (dg == NULL)) { |
816 |
< |
free(hp); |
817 |
< |
return(-1); /* no radius or gradient calc. */ |
818 |
< |
} |
819 |
< |
if ((d = bright(acol)) > FTINY) { /* normalize Y values */ |
700 |
> |
if ((d = bright(rcol)) > FTINY) { /* normalize Y values */ |
701 |
|
d = 0.99*(hp->ns*hp->ns)/d; |
702 |
|
K = 0.01; |
703 |
|
} else { /* or fall back on geometric Hessian */ |
704 |
|
K = 1.0; |
705 |
|
pg = NULL; |
706 |
|
dg = NULL; |
707 |
+ |
crlp = NULL; |
708 |
|
} |
709 |
|
ap = hp->sa; /* relative Y channel from here on... */ |
710 |
|
for (i = hp->ns*hp->ns; i--; ap++) |
732 |
|
if (ra[1] < minarad) |
733 |
|
ra[1] = minarad; |
734 |
|
} |
735 |
< |
ra[0] *= d = 1.0/sqrt(sqrt(wt)); |
735 |
> |
ra[0] *= d = 1.0/sqrt(wt); |
736 |
|
if ((ra[1] *= d) > 2.0*ra[0]) |
737 |
|
ra[1] = 2.0*ra[0]; |
738 |
|
if (ra[1] > maxarad) { |
740 |
|
if (ra[0] > maxarad) |
741 |
|
ra[0] = maxarad; |
742 |
|
} |
743 |
< |
if (crlp != NULL) /* flag encroached directions */ |
743 |
> |
/* flag encroached directions */ |
744 |
> |
if ((wt >= 0.89*AVGREFL) & (crlp != NULL)) |
745 |
|
*crlp = ambcorral(hp, uv, ra[0]*ambacc, ra[1]*ambacc); |
746 |
|
if (pg != NULL) { /* cap gradient if necessary */ |
747 |
|
d = pg[0]*pg[0]*ra[0]*ra[0] + pg[1]*pg[1]*ra[1]*ra[1]; |