7 |
|
|
8 |
|
#include "mkillum.h" |
9 |
|
#include "paths.h" |
10 |
– |
#include "random.h" |
10 |
|
#include "ezxml.h" |
11 |
|
|
12 |
+ |
#define MAXLATS 46 /* maximum number of latitudes */ |
13 |
|
|
14 |
+ |
/* BSDF angle specification (terminate with nphi = -1) */ |
15 |
+ |
typedef struct { |
16 |
+ |
char name[64]; /* basis name */ |
17 |
+ |
int nangles; /* total number of directions */ |
18 |
+ |
struct { |
19 |
+ |
float tmin; /* starting theta */ |
20 |
+ |
short nphis; /* number of phis (0 term) */ |
21 |
+ |
} lat[MAXLATS+1]; /* latitudes */ |
22 |
+ |
} ANGLE_BASIS; |
23 |
+ |
|
24 |
+ |
#define MAXABASES 3 /* limit on defined bases */ |
25 |
+ |
|
26 |
+ |
ANGLE_BASIS abase_list[MAXABASES] = { |
27 |
+ |
{ |
28 |
+ |
"LBNL/Klems Full", 145, |
29 |
+ |
{ {-5., 1}, |
30 |
+ |
{5., 8}, |
31 |
+ |
{15., 16}, |
32 |
+ |
{25., 20}, |
33 |
+ |
{35., 24}, |
34 |
+ |
{45., 24}, |
35 |
+ |
{55., 24}, |
36 |
+ |
{65., 16}, |
37 |
+ |
{75., 12}, |
38 |
+ |
{90., 0} } |
39 |
+ |
}, { |
40 |
+ |
"LBNL/Klems Half", 73, |
41 |
+ |
{ {-6.5, 1}, |
42 |
+ |
{6.5, 8}, |
43 |
+ |
{19.5, 12}, |
44 |
+ |
{32.5, 16}, |
45 |
+ |
{46.5, 20}, |
46 |
+ |
{61.5, 12}, |
47 |
+ |
{76.5, 4}, |
48 |
+ |
{90., 0} } |
49 |
+ |
}, { |
50 |
+ |
"LBNL/Klems Quarter", 41, |
51 |
+ |
{ {-9., 1}, |
52 |
+ |
{9., 8}, |
53 |
+ |
{27., 12}, |
54 |
+ |
{46., 12}, |
55 |
+ |
{66., 8}, |
56 |
+ |
{90., 0} } |
57 |
+ |
} |
58 |
+ |
}; |
59 |
+ |
|
60 |
+ |
static int nabases = 3; /* current number of defined bases */ |
61 |
+ |
|
62 |
+ |
|
63 |
+ |
static int |
64 |
+ |
ab_getvec( /* get vector for this angle basis index */ |
65 |
+ |
FVECT v, |
66 |
+ |
int ndx, |
67 |
+ |
void *p |
68 |
+ |
) |
69 |
+ |
{ |
70 |
+ |
ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
71 |
+ |
int li; |
72 |
+ |
double alt, azi, d; |
73 |
+ |
|
74 |
+ |
if ((ndx < 0) | (ndx >= ab->nangles)) |
75 |
+ |
return(0); |
76 |
+ |
for (li = 0; ndx >= ab->lat[li].nphis; li++) |
77 |
+ |
ndx -= ab->lat[li].nphis; |
78 |
+ |
alt = PI/180.*0.5*(ab->lat[li].tmin + ab->lat[li+1].tmin); |
79 |
+ |
azi = 2.*PI*ndx/ab->lat[li].nphis; |
80 |
+ |
d = sin(alt); |
81 |
+ |
v[0] = cos(azi)*d; |
82 |
+ |
v[1] = sin(azi)*d; |
83 |
+ |
v[2] = cos(alt); |
84 |
+ |
return(1); |
85 |
+ |
} |
86 |
+ |
|
87 |
+ |
|
88 |
+ |
static int |
89 |
+ |
ab_getndx( /* get index corresponding to the given vector */ |
90 |
+ |
FVECT v, |
91 |
+ |
void *p |
92 |
+ |
) |
93 |
+ |
{ |
94 |
+ |
ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
95 |
+ |
int li, ndx; |
96 |
+ |
double alt, azi, d; |
97 |
+ |
|
98 |
+ |
if ((v[2] < -1.0) | (v[2] > 1.0)) |
99 |
+ |
return(-1); |
100 |
+ |
alt = 180.0/PI*acos(v[2]); |
101 |
+ |
azi = 180.0/PI*atan2(v[1], v[0]); |
102 |
+ |
if (azi < 0.0) azi += 360.0; |
103 |
+ |
for (li = 1; ab->lat[li].tmin <= alt; li++) |
104 |
+ |
if (!ab->lat[li].nphis) |
105 |
+ |
return(-1); |
106 |
+ |
--li; |
107 |
+ |
ndx = (int)((1./360.)*azi*ab->lat[li].nphis + 0.5); |
108 |
+ |
if (ndx >= ab->lat[li].nphis) ndx = 0; |
109 |
+ |
while (li--) |
110 |
+ |
ndx += ab->lat[li].nphis; |
111 |
+ |
return(ndx); |
112 |
+ |
} |
113 |
+ |
|
114 |
+ |
|
115 |
+ |
static double |
116 |
+ |
ab_getohm( /* get solid angle for this angle basis index */ |
117 |
+ |
int ndx, |
118 |
+ |
void *p |
119 |
+ |
) |
120 |
+ |
{ |
121 |
+ |
ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
122 |
+ |
int li; |
123 |
+ |
double tdia, pdia; |
124 |
+ |
|
125 |
+ |
if ((ndx < 0) | (ndx >= ab->nangles)) |
126 |
+ |
return(0); |
127 |
+ |
for (li = 0; ndx >= ab->lat[li].nphis; li++) |
128 |
+ |
ndx -= ab->lat[li].nphis; |
129 |
+ |
if (ab->lat[li].nphis == 1) { /* special case */ |
130 |
+ |
if (ab->lat[li].tmin > FTINY) |
131 |
+ |
error(USER, "unsupported BSDF coordinate system"); |
132 |
+ |
tdia = PI/180. * ab->lat[li+1].tmin; |
133 |
+ |
return(PI*tdia*tdia); |
134 |
+ |
} |
135 |
+ |
tdia = PI/180.*(ab->lat[li+1].tmin - ab->lat[li].tmin); |
136 |
+ |
tdia *= sin(PI/180.*(ab->lat[li].tmin + ab->lat[li+1].tmin)); |
137 |
+ |
pdia = 2.*PI/ab->lat[li].nphis; |
138 |
+ |
return(tdia*pdia); |
139 |
+ |
} |
140 |
+ |
|
141 |
+ |
|
142 |
+ |
static int |
143 |
+ |
ab_getvecR( /* get reverse vector for this angle basis index */ |
144 |
+ |
FVECT v, |
145 |
+ |
int ndx, |
146 |
+ |
void *p |
147 |
+ |
) |
148 |
+ |
{ |
149 |
+ |
if (!ab_getvec(v, ndx, p)) |
150 |
+ |
return(0); |
151 |
+ |
|
152 |
+ |
v[0] = -v[0]; |
153 |
+ |
v[1] = -v[1]; |
154 |
+ |
|
155 |
+ |
return(1); |
156 |
+ |
} |
157 |
+ |
|
158 |
+ |
|
159 |
+ |
static int |
160 |
+ |
ab_getndxR( /* get index corresponding to the reverse vector */ |
161 |
+ |
FVECT v, |
162 |
+ |
void *p |
163 |
+ |
) |
164 |
+ |
{ |
165 |
+ |
FVECT v2; |
166 |
+ |
|
167 |
+ |
v2[0] = -v[0]; |
168 |
+ |
v2[1] = -v[1]; |
169 |
+ |
v2[2] = v[2]; |
170 |
+ |
|
171 |
+ |
return ab_getndx(v2, p); |
172 |
+ |
} |
173 |
+ |
|
174 |
+ |
|
175 |
+ |
static void |
176 |
+ |
load_bsdf_data( /* load BSDF distribution for this wavelength */ |
177 |
+ |
struct BSDF_data *dp, |
178 |
+ |
ezxml_t wdb |
179 |
+ |
) |
180 |
+ |
{ |
181 |
+ |
char *cbasis = ezxml_txt(ezxml_child(wdb,"ColumnAngleBasis")); |
182 |
+ |
char *rbasis = ezxml_txt(ezxml_child(wdb,"RowAngleBasis")); |
183 |
+ |
char *sdata; |
184 |
+ |
int i; |
185 |
+ |
|
186 |
+ |
if ((cbasis == NULL) | (rbasis == NULL)) { |
187 |
+ |
error(WARNING, "missing column/row basis for BSDF"); |
188 |
+ |
return; |
189 |
+ |
} |
190 |
+ |
/* XXX need to add routines for loading in foreign bases */ |
191 |
+ |
for (i = nabases; i--; ) |
192 |
+ |
if (!strcmp(cbasis, abase_list[i].name)) { |
193 |
+ |
dp->ninc = abase_list[i].nangles; |
194 |
+ |
dp->ib_priv = (void *)&abase_list[i]; |
195 |
+ |
dp->ib_vec = ab_getvec; |
196 |
+ |
dp->ib_ndx = ab_getndx; |
197 |
+ |
dp->ib_ohm = ab_getohm; |
198 |
+ |
break; |
199 |
+ |
} |
200 |
+ |
if (i < 0) { |
201 |
+ |
sprintf(errmsg, "unsupported ColumnAngleBasis '%s'", cbasis); |
202 |
+ |
error(WARNING, errmsg); |
203 |
+ |
return; |
204 |
+ |
} |
205 |
+ |
for (i = nabases; i--; ) |
206 |
+ |
if (!strcmp(rbasis, abase_list[i].name)) { |
207 |
+ |
dp->nout = abase_list[i].nangles; |
208 |
+ |
dp->ob_priv = (void *)&abase_list[i]; |
209 |
+ |
dp->ob_vec = ab_getvecR; |
210 |
+ |
dp->ob_ndx = ab_getndxR; |
211 |
+ |
dp->ob_ohm = ab_getohm; |
212 |
+ |
break; |
213 |
+ |
} |
214 |
+ |
if (i < 0) { |
215 |
+ |
sprintf(errmsg, "unsupported RowAngleBasis '%s'", cbasis); |
216 |
+ |
error(WARNING, errmsg); |
217 |
+ |
return; |
218 |
+ |
} |
219 |
+ |
/* read BSDF data */ |
220 |
+ |
sdata = ezxml_txt(ezxml_child(wdb,"ScatteringData")); |
221 |
+ |
if (sdata == NULL) { |
222 |
+ |
error(WARNING, "missing BSDF ScatteringData"); |
223 |
+ |
return; |
224 |
+ |
} |
225 |
+ |
dp->bsdf = (float *)malloc(sizeof(float)*dp->ninc*dp->nout); |
226 |
+ |
if (dp->bsdf == NULL) |
227 |
+ |
error(SYSTEM, "out of memory in load_bsdf_data"); |
228 |
+ |
for (i = 0; i < dp->ninc*dp->nout; i++) { |
229 |
+ |
char *sdnext = fskip(sdata); |
230 |
+ |
if (sdnext == NULL) { |
231 |
+ |
error(WARNING, "bad/missing BSDF ScatteringData"); |
232 |
+ |
free(dp->bsdf); dp->bsdf = NULL; |
233 |
+ |
return; |
234 |
+ |
} |
235 |
+ |
while (*sdnext && isspace(*sdnext)) |
236 |
+ |
sdnext++; |
237 |
+ |
if (*sdnext == ',') sdnext++; |
238 |
+ |
dp->bsdf[i] = atof(sdata); |
239 |
+ |
sdata = sdnext; |
240 |
+ |
} |
241 |
+ |
while (isspace(*sdata)) |
242 |
+ |
sdata++; |
243 |
+ |
if (*sdata) { |
244 |
+ |
sprintf(errmsg, "%d extra characters after BSDF ScatteringData", |
245 |
+ |
strlen(sdata)); |
246 |
+ |
error(WARNING, errmsg); |
247 |
+ |
} |
248 |
+ |
} |
249 |
+ |
|
250 |
+ |
|
251 |
|
struct BSDF_data * |
252 |
|
load_BSDF( /* load BSDF data from file */ |
253 |
|
char *fname |
254 |
|
) |
255 |
|
{ |
256 |
|
char *path; |
257 |
< |
ezxml_t fl, wld, wdb; |
257 |
> |
ezxml_t fl, wtl, wld, wdb; |
258 |
|
struct BSDF_data *dp; |
259 |
|
|
260 |
|
path = getpath(fname, getrlibpath(), R_OK); |
269 |
|
error(WARNING, errmsg); |
270 |
|
return(NULL); |
271 |
|
} |
272 |
+ |
if (ezxml_error(fl)[0]) { |
273 |
+ |
sprintf(errmsg, "BSDF \"%s\" %s", path, ezxml_error(fl)); |
274 |
+ |
error(WARNING, errmsg); |
275 |
+ |
ezxml_free(fl); |
276 |
+ |
return(NULL); |
277 |
+ |
} |
278 |
+ |
if (strcmp(ezxml_name(fl), "WindowElement")) { |
279 |
+ |
sprintf(errmsg, |
280 |
+ |
"BSDF \"%s\": top level node not 'WindowElement'", |
281 |
+ |
path); |
282 |
+ |
error(WARNING, errmsg); |
283 |
+ |
ezxml_free(fl); |
284 |
+ |
return(NULL); |
285 |
+ |
} |
286 |
+ |
wtl = ezxml_child(ezxml_child(fl, "Optical"), "Layer"); |
287 |
|
dp = (struct BSDF_data *)calloc(1, sizeof(struct BSDF_data)); |
288 |
< |
if (dp == NULL) |
289 |
< |
goto memerr; |
290 |
< |
for (wld = ezxml_child(fl, "WavelengthData"); |
39 |
< |
fl != NULL; fl = fl->next) { |
40 |
< |
if (strcmp(ezxml_child(wld, "Wavelength")->txt, "Visible")) |
288 |
> |
for (wld = ezxml_child(wtl, "WavelengthData"); |
289 |
> |
wld != NULL; wld = wld->next) { |
290 |
> |
if (strcmp(ezxml_txt(ezxml_child(wld,"Wavelength")), "Visible")) |
291 |
|
continue; |
292 |
|
wdb = ezxml_child(wld, "WavelengthDataBlock"); |
293 |
|
if (wdb == NULL) continue; |
294 |
< |
if (strcmp(ezxml_child(wdb, "WavelengthDataDirection")->txt, |
294 |
> |
if (strcmp(ezxml_txt(ezxml_child(wdb,"WavelengthDataDirection")), |
295 |
|
"Transmission Front")) |
296 |
|
continue; |
297 |
+ |
load_bsdf_data(dp, wdb); /* load front BTDF */ |
298 |
+ |
break; /* ignore the rest */ |
299 |
|
} |
300 |
< |
/* etc... */ |
301 |
< |
ezxml_free(fl); |
300 |
> |
ezxml_free(fl); /* done with XML file */ |
301 |
> |
if (dp->bsdf == NULL) { |
302 |
> |
sprintf(errmsg, "bad/missing BTDF data in \"%s\"", path); |
303 |
> |
error(WARNING, errmsg); |
304 |
> |
free_BSDF(dp); |
305 |
> |
dp = NULL; |
306 |
> |
} |
307 |
|
return(dp); |
51 |
– |
memerr: |
52 |
– |
error(SYSTEM, "out of memory in load_BSDF"); |
53 |
– |
return NULL; /* pro forma return */ |
308 |
|
} |
309 |
|
|
310 |
|
|
315 |
|
{ |
316 |
|
if (b == NULL) |
317 |
|
return; |
318 |
< |
free(b->bsdf); |
318 |
> |
if (b->bsdf != NULL) |
319 |
> |
free(b->bsdf); |
320 |
|
free(b); |
321 |
|
} |
322 |
|
|
323 |
|
|
324 |
< |
void |
324 |
> |
int |
325 |
|
r_BSDF_incvec( /* compute random input vector at given location */ |
326 |
|
FVECT v, |
327 |
|
struct BSDF_data *b, |
334 |
|
double rad; |
335 |
|
int j; |
336 |
|
|
337 |
< |
getBSDF_incvec(v, b, i); |
338 |
< |
rad = getBSDF_incrad(b, i); |
337 |
> |
if (!getBSDF_incvec(v, b, i)) |
338 |
> |
return(0); |
339 |
> |
rad = sqrt(getBSDF_incohm(b, i) / PI); |
340 |
|
multisamp(pert, 3, rv); |
341 |
|
for (j = 0; j < 3; j++) |
342 |
|
v[j] += rad*(2.*pert[j] - 1.); |
343 |
|
if (xm != NULL) |
344 |
|
multv3(v, v, xm); |
345 |
< |
normalize(v); |
345 |
> |
return(normalize(v) != 0.0); |
346 |
|
} |
347 |
|
|
348 |
|
|
349 |
< |
void |
349 |
> |
int |
350 |
|
r_BSDF_outvec( /* compute random output vector at given location */ |
351 |
|
FVECT v, |
352 |
|
struct BSDF_data *b, |
359 |
|
double rad; |
360 |
|
int j; |
361 |
|
|
362 |
< |
getBSDF_outvec(v, b, o); |
363 |
< |
rad = getBSDF_outrad(b, o); |
362 |
> |
if (!getBSDF_outvec(v, b, o)) |
363 |
> |
return(0); |
364 |
> |
rad = sqrt(getBSDF_outohm(b, o) / PI); |
365 |
|
multisamp(pert, 3, rv); |
366 |
|
for (j = 0; j < 3; j++) |
367 |
|
v[j] += rad*(2.*pert[j] - 1.); |
368 |
|
if (xm != NULL) |
369 |
|
multv3(v, v, xm); |
370 |
< |
normalize(v); |
370 |
> |
return(normalize(v) != 0.0); |
371 |
|
} |
372 |
|
|
373 |
|
|
386 |
|
char **xfp = xfarg; |
387 |
|
double theta; |
388 |
|
|
389 |
+ |
if (yp[2]*yp[2] + zp[2]*zp[2] < 2.*FTINY*FTINY) { |
390 |
+ |
/* Special case for X' along Z-axis */ |
391 |
+ |
theta = -atan2(yp[0], yp[1]); |
392 |
+ |
*xfp++ = "-ry"; |
393 |
+ |
*xfp++ = xp[2] < 0.0 ? "90" : "-90"; |
394 |
+ |
*xfp++ = "-rz"; |
395 |
+ |
sprintf(bufs[bn], "%f", theta*(180./PI)); |
396 |
+ |
*xfp++ = bufs[bn++]; |
397 |
+ |
return(xfp - xfarg); |
398 |
+ |
} |
399 |
|
theta = atan2(yp[2], zp[2]); |
400 |
|
if (!FEQ(theta,0.0)) { |
401 |
|
*xfp++ = "-rx"; |
420 |
|
|
421 |
|
|
422 |
|
int |
423 |
< |
getBSDF_xfm( /* compute transform for the given surface */ |
423 |
> |
getBSDF_xfm( /* compute BSDF orient. -> world orient. transform */ |
424 |
|
MAT4 xm, |
425 |
|
FVECT nrm, |
426 |
|
UpDir ud |
451 |
|
updir[2] = 1.; |
452 |
|
break; |
453 |
|
case UDunknown: |
187 |
– |
error(WARNING, "unspecified up direction"); |
454 |
|
return(0); |
455 |
|
} |
456 |
|
fcross(xdest, updir, nrm); |
474 |
|
MAT4 xm |
475 |
|
) |
476 |
|
{ |
477 |
+ |
int nout = 0; |
478 |
|
MAT4 mymat, inmat; |
479 |
|
COLORV *idist; |
480 |
|
COLORV *cp, *csum; |
481 |
|
FVECT dv; |
482 |
|
double wt; |
483 |
< |
int i, j, k, h; |
483 |
> |
int i, j, k, o; |
484 |
|
COLOR col, cinc; |
485 |
|
/* copy incoming distribution */ |
486 |
|
if (b->ninc != distsiz) |
514 |
|
getBSDF_incvec(dv, b, i); /* compute incident irrad. */ |
515 |
|
multv3(dv, dv, mymat); |
516 |
|
if (dv[2] < 0.0) dv[2] = -dv[2]; |
517 |
< |
wt = getBSDF_incrad(b, i); |
518 |
< |
wt *= wt*PI * dv[2]; /* solid_angle*cosine(theta) */ |
517 |
> |
wt = getBSDF_incohm(b, i); |
518 |
> |
wt *= dv[2]; /* solid_angle*cosine(theta) */ |
519 |
|
cp = &idist[3*i]; |
520 |
|
copycolor(cinc, cp); |
521 |
|
scalecolor(cinc, wt); |
524 |
|
flatdir(dv, (k + .5)/nalt, (double)j/nazi); |
525 |
|
multv3(dv, dv, inmat); |
526 |
|
/* evaluate BSDF @ outgoing */ |
527 |
< |
wt = BSDF_visible(b, i, getBSDF_outndx(b, dv)); |
527 |
> |
o = getBSDF_outndx(b, dv); |
528 |
> |
if (o < 0) { |
529 |
> |
nout++; |
530 |
> |
continue; |
531 |
> |
} |
532 |
> |
wt = BSDF_value(b, i, o); |
533 |
|
copycolor(col, cinc); |
534 |
|
scalecolor(col, wt); |
535 |
|
csum = &distarr[3*(k*nazi + j)]; |
537 |
|
} |
538 |
|
} |
539 |
|
free(idist); /* free temp space */ |
540 |
+ |
if (nout) { |
541 |
+ |
sprintf(errmsg, "missing %.1f%% of BSDF directions", |
542 |
+ |
100.*nout/(b->ninc*nalt*nazi)); |
543 |
+ |
error(WARNING, errmsg); |
544 |
+ |
} |
545 |
|
} |