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#include "glare.h" |
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#include "random.h" |
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#define FEQ(a,b) ((a)-(b)<=FTINY&&(a)-(b)<=FTINY) |
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#define VEQ(v1,v2) (FEQ((v1)[0],(v2)[0])&&FEQ((v1)[1],(v2)[1]) \ |
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&&FEQ((v1)[2],(v2)[2])) |
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int nglarangs = 0; |
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double maxtheta; /* maximum angle (in radians) */ |
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int hsize; /* horizontal size */ |
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int hlim; /* central limit of horizontal */ |
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|
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struct illum *indirect; /* array of indirect illuminances */ |
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|
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int argc; |
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char *argv[]; |
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{ |
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int combine = 1; |
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int gotview = 0; |
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int rval, i; |
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char *err; |
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case 'p': |
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picture = argv[++i]; |
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break; |
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case 'c': |
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combine = !combine; |
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break; |
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case 'd': |
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case 'l': |
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rtargv[rtargc++] = argv[i]; |
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if (threshold <= FTINY) |
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comp_thresh(); /* compute glare threshold */ |
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analyze(); /* analyze view */ |
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if (combine) |
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absorb_specks(); /* eliminate tiny sources */ |
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cleanup(); /* tidy up */ |
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/* print header */ |
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printargs(argc, argv, stdout); |
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fputs(VIEWSTR, stdout); |
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fprintview(&ourview, stdout); |
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printf("\n\n"); |
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printf("\n"); |
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fputformat("ascii", stdout); |
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printf("\n"); |
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printsources(); /* print glare sources */ |
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printillum(); /* print illuminances */ |
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exit(0); |
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} |
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|
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|
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int |
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angcmp(ap1, ap2) /* compare two angles */ |
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ANGLE *ap1, *ap2; |
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{ |
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register int a1, a2; |
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|
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a1 = *ap1; |
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a2 = *ap2; |
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if (a1 == a2) { |
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fprintf(stderr, "%s: duplicate glare angle (%d)\n", |
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progname, a1); |
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exit(1); |
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} |
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return(a1-a2); |
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} |
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|
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|
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init() /* initialize global variables */ |
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{ |
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double d; |
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/* set direction vectors */ |
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for (i = 0; glarang[i] != AEND; i++) |
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; |
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if (i > 0 && (glarang[0] <= 0 || glarang[i-1] >= 180)) { |
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fprintf(stderr, "%s: glare angles must be between 1 and 179\n", |
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> |
qsort(glarang, i, sizeof(ANGLE), angcmp); |
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> |
if (i > 0 && (glarang[0] <= 0 || glarang[i-1] > 180)) { |
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> |
fprintf(stderr, "%s: glare angles must be between 1 and 180\n", |
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progname); |
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exit(1); |
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} |
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maxtheta = (PI/180.)*glarang[nglarangs-1]; |
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else |
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maxtheta = 0.0; |
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< |
hlim = sampdens*maxtheta; |
225 |
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hsize = hlim + sampdens - 1; |
247 |
> |
hsize = hlim(0) + sampdens - 1; |
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if (hsize > (int)(PI*sampdens)) |
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hsize = PI*sampdens; |
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indirect = (struct illum *)calloc(nglardirs, sizeof(struct illum)); |
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cleanup() /* close files, wait for children */ |
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{ |
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if (verbose) |
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< |
fprintf(stderr, "%s: cleaning up...\n", progname); |
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> |
fprintf(stderr, "%s: cleaning up... \n", progname); |
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if (picture != NULL) |
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close_pict(); |
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if (octree != NULL) |
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FVECT vd; |
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int x, y; |
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{ |
317 |
< |
long t; |
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> |
int hl; |
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FVECT org; /* dummy variable */ |
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|
320 |
< |
if (x <= -hlim) /* left region */ |
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> |
hl = hlim(y); |
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> |
if (x <= -hl) { /* left region */ |
322 |
> |
if (x <= -hl-sampdens) |
323 |
> |
return(-1); |
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return(viewray(org, vd, &leftview, |
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< |
(double)(x+hlim)/(2*sampdens)+.5, |
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> |
(double)(x+hl)/(2*sampdens)+.5, |
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(double)y/(2*sampdens)+.5)); |
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if (x >= hlim) /* right region */ |
327 |
> |
} |
328 |
> |
if (x >= hl) { /* right region */ |
329 |
> |
if (x >= hl+sampdens) |
330 |
> |
return(-1); |
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return(viewray(org, vd, &rightview, |
332 |
< |
(double)(x-hlim)/(2*sampdens)+.5, |
332 |
> |
(double)(x-hl)/(2*sampdens)+.5, |
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(double)y/(2*sampdens)+.5)); |
334 |
+ |
} |
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/* central region */ |
307 |
– |
/* avoid over-counting of poles */ |
308 |
– |
t = random() % vsize; |
309 |
– |
if (t*t >= (long)vsize*vsize - (long)y*y) |
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return(-1); |
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if (viewray(org, vd, &ourview, .5, (double)y/(2*sampdens)+.5) < 0) |
337 |
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return(-1); |
338 |
< |
spinvector(vd, vd, ourview.vup, h_theta(x)); |
338 |
> |
spinvector(vd, vd, ourview.vup, h_theta(x,y)); |
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return(0); |
340 |
+ |
} |
341 |
+ |
|
342 |
+ |
|
343 |
+ |
double |
344 |
+ |
pixsize(x, y) /* return the solid angle of pixel at (x,y) */ |
345 |
+ |
int x, y; |
346 |
+ |
{ |
347 |
+ |
register int hl, xo; |
348 |
+ |
double disc; |
349 |
+ |
|
350 |
+ |
hl = hlim(y); |
351 |
+ |
if (x < -hl) |
352 |
+ |
xo = x+hl; |
353 |
+ |
else if (x > hl) |
354 |
+ |
xo = x-hl; |
355 |
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else |
356 |
+ |
xo = 0; |
357 |
+ |
disc = 1. - (double)(xo*xo + y*y)/(sampdens*sampdens); |
358 |
+ |
if (disc <= FTINY) |
359 |
+ |
return(0.); |
360 |
+ |
return(1./(sampdens*sampdens*sqrt(disc))); |
361 |
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} |
362 |
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