20 |
|
double pctcull = 90.; |
21 |
|
/* sampling order */ |
22 |
|
int samp_order = 6; |
23 |
+ |
/* super-sampling threshold */ |
24 |
+ |
const double ssamp_thresh = 0.35; |
25 |
+ |
/* number of super-samples */ |
26 |
+ |
const int nssamp = 100; |
27 |
|
|
28 |
|
/* Output XML prologue to stdout */ |
29 |
|
static void |
94 |
|
puts("</WindowElement>"); |
95 |
|
} |
96 |
|
|
97 |
+ |
/* Compute absolute relative difference */ |
98 |
+ |
static double |
99 |
+ |
abs_diff(double v1, double v0) |
100 |
+ |
{ |
101 |
+ |
if ((v0 < 0) | (v1 < 0)) |
102 |
+ |
return(.0); |
103 |
+ |
v1 = (v1-v0)*2./(v0+v1+.0001); |
104 |
+ |
if (v1 < 0) |
105 |
+ |
return(-v1); |
106 |
+ |
return(v1); |
107 |
+ |
} |
108 |
+ |
|
109 |
|
/* Interpolate and output isotropic BSDF data */ |
110 |
|
static void |
111 |
|
eval_isotropic(char *funame) |
116 |
|
int ix, ox, oy; |
117 |
|
double iovec[6]; |
118 |
|
float bsdf; |
119 |
< |
#if DEBUG |
104 |
< |
fprintf(stderr, "Writing isotropic order %d ", samp_order); |
105 |
< |
if (pctcull >= 0) fprintf(stderr, "data with %.1f%% culling\n", pctcull); |
106 |
< |
else fputs("raw data\n", stderr); |
107 |
< |
#endif |
119 |
> |
|
120 |
|
data_prologue(); /* begin output */ |
121 |
|
if (pctcull >= 0) { |
122 |
|
sprintf(cmd, "rttree_reduce -h -a -ff -r 3 -t %f -g %d", |
134 |
|
/* run through directions */ |
135 |
|
for (ix = 0; ix < sqres/2; ix++) { |
136 |
|
RBFNODE *rbf = NULL; |
137 |
< |
iovec[0] = (ix+.5)/sqres - 1.; |
137 |
> |
iovec[0] = 2.*(ix+.5)/sqres - 1.; |
138 |
|
iovec[1] = .0; |
139 |
|
iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]); |
140 |
|
if (funame == NULL) |
141 |
|
rbf = advect_rbf(iovec); |
142 |
< |
for (ox = 0; ox < sqres; ox++) |
142 |
> |
for (ox = 0; ox < sqres; ox++) { |
143 |
> |
float last_bsdf = -1; |
144 |
|
for (oy = 0; oy < sqres; oy++) { |
145 |
|
SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres); |
146 |
|
iovec[5] = output_orient * |
147 |
|
sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]); |
148 |
|
if (funame == NULL) |
149 |
< |
bsdf = eval_rbfrep(rbf, iovec+3) * |
149 |
> |
bsdf = eval_rbfrep(rbf, iovec+3) * |
150 |
|
output_orient/iovec[5]; |
151 |
< |
else |
152 |
< |
bsdf = funvalue(funame, 6, iovec); |
151 |
> |
else { |
152 |
> |
double ssa[3], ssvec[6], sum; |
153 |
> |
int ssi; |
154 |
> |
bsdf = funvalue(funame, 6, iovec); |
155 |
> |
if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) { |
156 |
> |
sum = 0; /* super-sample voxel */ |
157 |
> |
for (ssi = nssamp; ssi--; ) { |
158 |
> |
SDmultiSamp(ssa, 3, (ssi+drand48())/nssamp); |
159 |
> |
ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.; |
160 |
> |
ssvec[1] = .0; |
161 |
> |
ssvec[2] = input_orient * |
162 |
> |
sqrt(1. - ssvec[0]*ssvec[0]); |
163 |
> |
SDsquare2disk(ssvec+3, (ox+ssa[1])/sqres, |
164 |
> |
(oy+ssa[2])/sqres); |
165 |
> |
ssvec[5] = output_orient * |
166 |
> |
sqrt(1. - ssvec[3]*ssvec[3] - |
167 |
> |
ssvec[4]*ssvec[4]); |
168 |
> |
sum += funvalue(funame, 6, ssvec); |
169 |
> |
} |
170 |
> |
bsdf = sum/nssamp; |
171 |
> |
} |
172 |
> |
} |
173 |
|
if (pctcull >= 0) |
174 |
|
fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
175 |
|
else |
176 |
|
printf("\t%.3e\n", bsdf); |
177 |
+ |
last_bsdf = bsdf; |
178 |
|
} |
179 |
+ |
} |
180 |
|
if (rbf != NULL) |
181 |
|
free(rbf); |
182 |
|
} |
204 |
|
int ix, iy, ox, oy; |
205 |
|
double iovec[6]; |
206 |
|
float bsdf; |
207 |
< |
#if DEBUG |
173 |
< |
fprintf(stderr, "Writing anisotropic order %d ", samp_order); |
174 |
< |
if (pctcull >= 0) fprintf(stderr, "data with %.1f%% culling\n", pctcull); |
175 |
< |
else fputs("raw data\n", stderr); |
176 |
< |
#endif |
207 |
> |
|
208 |
|
data_prologue(); /* begin output */ |
209 |
|
if (pctcull >= 0) { |
210 |
|
sprintf(cmd, "rttree_reduce -h -a -ff -r 4 -t %f -g %d", |
222 |
|
for (ix = 0; ix < sqres; ix++) |
223 |
|
for (iy = 0; iy < sqres; iy++) { |
224 |
|
RBFNODE *rbf = NULL; /* Klems reversal */ |
225 |
< |
SDsquare2disk(iovec, (ix+.5)/sqres, (iy+.5)/sqres); |
195 |
< |
iovec[0] = -iovec[0]; iovec[1] = -iovec[1]; |
225 |
> |
SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres); |
226 |
|
iovec[2] = input_orient * |
227 |
|
sqrt(1. - iovec[0]*iovec[0] - iovec[1]*iovec[1]); |
228 |
|
if (funame == NULL) |
229 |
|
rbf = advect_rbf(iovec); |
230 |
< |
for (ox = 0; ox < sqres; ox++) |
230 |
> |
for (ox = 0; ox < sqres; ox++) { |
231 |
> |
float last_bsdf = -1; |
232 |
|
for (oy = 0; oy < sqres; oy++) { |
233 |
|
SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres); |
234 |
|
iovec[5] = output_orient * |
235 |
|
sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]); |
236 |
|
if (funame == NULL) |
237 |
< |
bsdf = eval_rbfrep(rbf, iovec+3) * |
237 |
> |
bsdf = eval_rbfrep(rbf, iovec+3) * |
238 |
|
output_orient/iovec[5]; |
239 |
< |
else |
240 |
< |
bsdf = funvalue(funame, 6, iovec); |
239 |
> |
else { |
240 |
> |
double ssa[4], ssvec[6], sum; |
241 |
> |
int ssi; |
242 |
> |
bsdf = funvalue(funame, 6, iovec); |
243 |
> |
if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) { |
244 |
> |
sum = 0; /* super-sample voxel */ |
245 |
> |
for (ssi = nssamp; ssi--; ) { |
246 |
> |
SDmultiSamp(ssa, 4, (ssi+drand48())/nssamp); |
247 |
> |
SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres, |
248 |
> |
1.-(iy+ssa[1])/sqres); |
249 |
> |
ssvec[2] = output_orient * |
250 |
> |
sqrt(1. - ssvec[0]*ssvec[0] - |
251 |
> |
ssvec[1]*ssvec[1]); |
252 |
> |
SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres, |
253 |
> |
(oy+ssa[3])/sqres); |
254 |
> |
ssvec[5] = output_orient * |
255 |
> |
sqrt(1. - ssvec[3]*ssvec[3] - |
256 |
> |
ssvec[4]*ssvec[4]); |
257 |
> |
sum += funvalue(funame, 6, ssvec); |
258 |
> |
} |
259 |
> |
bsdf = sum/nssamp; |
260 |
> |
} |
261 |
> |
} |
262 |
|
if (pctcull >= 0) |
263 |
|
fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
264 |
|
else |
265 |
|
printf("\t%.3e\n", bsdf); |
266 |
+ |
last_bsdf = bsdf; |
267 |
|
} |
268 |
+ |
} |
269 |
|
if (rbf != NULL) |
270 |
|
free(rbf); |
271 |
|
} |
309 |
|
case 't': |
310 |
|
switch (argv[i][2]) { |
311 |
|
case '3': |
312 |
< |
single_plane_incident = 0; |
312 |
> |
single_plane_incident = 1; |
313 |
|
break; |
314 |
|
case '4': |
315 |
< |
single_plane_incident = 1; |
315 |
> |
single_plane_incident = 0; |
316 |
|
break; |
317 |
|
case '\0': |
318 |
|
pctcull = atof(argv[++i]); |