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/* Copyright (c) 1991 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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|
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/* |
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* Find glare sources in a scene or image. |
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* |
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* Greg Ward March 1991 |
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*/ |
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|
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#include "glare.h" |
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|
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#define FEQ(a,b) ((a)-(b)<=FTINY&&(b)-(a)<=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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|
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char *rtargv[32] = {"rtrace", "-h-", "-ov", "-fff"}; |
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int rtargc = 4; |
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|
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VIEW ourview = STDVIEW; /* our view */ |
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VIEW pictview = STDVIEW; /* picture view */ |
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VIEW leftview, rightview; /* leftmost and rightmost views */ |
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|
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char *picture = NULL; /* picture file name */ |
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char *octree = NULL; /* octree file name */ |
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|
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int verbose = 0; /* verbose reporting */ |
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char *progname; /* global argv[0] */ |
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|
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double threshold = 0.; /* glare threshold */ |
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|
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int sampdens = SAMPDENS; /* sample density */ |
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ANGLE glarang[180] = {AEND}; /* glare calculation angles */ |
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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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|
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struct illum *indirect; /* array of indirect illuminances */ |
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|
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long npixinvw; /* number of pixels in view */ |
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long npixmiss; /* number of pixels missed */ |
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|
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|
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main(argc, argv) |
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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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|
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progname = argv[0]; |
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/* process options */ |
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for (i = 1; i < argc && argv[i][0] == '-'; i++) { |
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rval = getviewopt(&ourview, argc-i, argv+i); |
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if (rval >= 0) { |
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i += rval; |
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gotview++; |
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continue; |
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} |
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switch (argv[i][1]) { |
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case 't': |
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threshold = atof(argv[++i]); |
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break; |
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case 'r': |
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sampdens = atoi(argv[++i])/2; |
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break; |
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case 'v': |
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if (argv[i][2] == '\0') { |
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verbose++; |
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break; |
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} |
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if (argv[i][2] != 'f') |
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goto userr; |
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rval = viewfile(argv[++i], &ourview, 0, 0); |
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if (rval < 0) { |
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fprintf(stderr, |
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"%s: cannot open view file \"%s\"\n", |
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progname, argv[i]); |
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exit(1); |
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} else if (rval == 0) { |
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fprintf(stderr, |
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"%s: bad view file \"%s\"\n", |
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progname, argv[i]); |
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exit(1); |
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} else |
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gotview++; |
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break; |
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case 'g': |
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if (argv[i][2] != 'a') |
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goto userr; |
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if (setscan(glarang, argv[++i]) < 0) { |
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fprintf(stderr, "%s: bad angle spec \"%s\"\n", |
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progname, argv[i]); |
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exit(1); |
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} |
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break; |
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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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case 's': |
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rtargv[rtargc++] = argv[i]; |
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rtargv[rtargc++] = argv[++i]; |
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break; |
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case 'a': |
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rtargv[rtargc++] = argv[i]; |
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if (argv[i][2] == 'v') { |
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rtargv[rtargc++] = argv[++i]; |
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rtargv[rtargc++] = argv[++i]; |
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} |
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rtargv[rtargc++] = argv[++i]; |
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break; |
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default: |
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goto userr; |
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} |
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} |
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/* get octree */ |
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if (i < argc-1) |
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goto userr; |
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if (i == argc-1) { |
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rtargv[rtargc++] = octree = argv[i]; |
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rtargv[rtargc] = NULL; |
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} |
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/* get view */ |
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if (picture != NULL) { |
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rval = viewfile(picture, &pictview, 0, 0); |
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if (rval < 0) { |
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fprintf(stderr, "%s: cannot open picture file \"%s\"\n", |
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progname, picture); |
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exit(1); |
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} else if (rval == 0) { |
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fprintf(stderr, |
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"%s: cannot get view from picture \"%s\"\n", |
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progname, picture); |
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exit(1); |
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} |
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if (pictview.type == VT_PAR) { |
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fprintf(stderr, "%s: %s: cannot use parallel view\n", |
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progname, picture); |
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exit(1); |
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} |
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if ((err = setview(&pictview)) != NULL) { |
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fprintf(stderr, "%s: %s\n", picture, err); |
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exit(1); |
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} |
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} |
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if (!gotview) { |
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if (picture == NULL) { |
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fprintf(stderr, "%s: must have view or picture\n", |
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progname); |
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exit(1); |
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} |
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copystruct(&ourview, &pictview); |
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} else if (picture != NULL && !VEQ(ourview.vp, pictview.vp)) { |
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fprintf(stderr, "%s: picture must have same viewpoint\n", |
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progname); |
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exit(1); |
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} |
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ourview.type = VT_HEM; |
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ourview.horiz = ourview.vert = 180.0; |
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ourview.hoff = ourview.voff = 0.0; |
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fvsum(ourview.vdir, ourview.vdir, ourview.vup, |
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-DOT(ourview.vdir,ourview.vup)); |
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if ((err = setview(&ourview)) != NULL) { |
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fprintf(stderr, "%s: %s\n", progname, err); |
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exit(1); |
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} |
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if (octree == NULL && picture == NULL) { |
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fprintf(stderr, |
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"%s: must specify at least one of picture or octree\n", |
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progname); |
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exit(1); |
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} |
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init(); /* initialize program */ |
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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"); |
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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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userr: |
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fprintf(stderr, |
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"Usage: %s [view options][-ga angles][-p picture][[rtrace options] octree]\n", |
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progname); |
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exit(1); |
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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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register int i; |
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|
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if (verbose) |
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fprintf(stderr, "%s: initializing data structures...\n", |
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progname); |
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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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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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nglarangs = i; |
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/* nglardirs = 2*nglarangs + 1; */ |
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/* vsize = sampdens - 1; */ |
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if (nglarangs > 0) |
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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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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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if (indirect == NULL) |
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memerr("indirect illuminances"); |
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npixinvw = npixmiss = 0L; |
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copystruct(&leftview, &ourview); |
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copystruct(&rightview, &ourview); |
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spinvector(leftview.vdir, ourview.vdir, ourview.vup, maxtheta); |
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spinvector(rightview.vdir, ourview.vdir, ourview.vup, -maxtheta); |
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setview(&leftview); |
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setview(&rightview); |
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indirect[nglarangs].lcos = |
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indirect[nglarangs].rcos = cos(maxtheta); |
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indirect[nglarangs].rsin = |
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-(indirect[nglarangs].lsin = sin(maxtheta)); |
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indirect[nglarangs].theta = 0.0; |
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for (i = 0; i < nglarangs; i++) { |
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d = (glarang[nglarangs-1] - glarang[i])*(PI/180.); |
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indirect[nglarangs-i-1].lcos = |
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indirect[nglarangs+i+1].rcos = cos(d); |
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indirect[nglarangs+i+1].rsin = |
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-(indirect[nglarangs-i-1].lsin = sin(d)); |
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d = (glarang[nglarangs-1] + glarang[i])*(PI/180.); |
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indirect[nglarangs-i-1].rcos = |
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indirect[nglarangs+i+1].lcos = cos(d); |
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indirect[nglarangs-i-1].rsin = |
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-(indirect[nglarangs+i+1].lsin = sin(d)); |
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indirect[nglarangs-i-1].theta = (PI/180.)*glarang[i]; |
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indirect[nglarangs+i+1].theta = -(PI/180.)*glarang[i]; |
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} |
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/* open picture */ |
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if (picture != NULL) { |
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if (verbose) |
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fprintf(stderr, "%s: opening picture file \"%s\"...\n", |
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progname, picture); |
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open_pict(picture); |
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} |
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/* start rtrace */ |
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if (octree != NULL) { |
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if (verbose) { |
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fprintf(stderr, |
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"%s: starting luminance calculation...\n\t", |
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progname); |
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printargs(rtargc, rtargv, stderr); |
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} |
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fork_rtrace(rtargv); |
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} |
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} |
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|
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|
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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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if (picture != NULL) |
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close_pict(); |
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if (octree != NULL) |
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done_rtrace(); |
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if (npixinvw < 100*npixmiss) |
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fprintf(stderr, "%s: warning -- missing %ld%% of samples\n", |
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progname, 100L*npixmiss/npixinvw); |
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} |
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|
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|
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compdir(vd, x, y) /* compute direction for x,y */ |
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FVECT vd; |
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int x, y; |
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{ |
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int hl; |
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FVECT org; /* dummy variable */ |
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|
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hl = hlim(y); |
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if (x <= -hl) { /* left region */ |
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if (x <= -hl-sampdens) |
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return(-1); |
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return(viewray(org, vd, &leftview, |
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(double)(x+hl)/(2*sampdens)+.5, |
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(double)y/(2*sampdens)+.5)); |
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} |
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if (x >= hl) { /* right region */ |
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if (x >= hl+sampdens) |
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return(-1); |
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return(viewray(org, vd, &rightview, |
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(double)(x-hl)/(2*sampdens)+.5, |
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(double)y/(2*sampdens)+.5)); |
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} |
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/* central region */ |
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if (viewray(org, vd, &ourview, .5, (double)y/(2*sampdens)+.5) < 0) |
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return(-1); |
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spinvector(vd, vd, ourview.vup, h_theta(x,y)); |
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return(0); |
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} |
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|
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|
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double |
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pixsize(x, y) /* return the solid angle of pixel at (x,y) */ |
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int x, y; |
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{ |
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register int hl, xo; |
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double disc; |
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|
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hl = hlim(y); |
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if (x < -hl) |
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xo = x+hl; |
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else if (x > hl) |
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xo = x-hl; |
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else |
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xo = 0; |
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disc = 1. - (double)(xo*xo + y*y)/(sampdens*sampdens); |
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if (disc <= FTINY) |
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return(0.); |
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return(1./(sampdens*sampdens*sqrt(disc))); |
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} |
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|
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|
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memerr(s) /* malloc failure */ |
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char *s; |
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{ |
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fprintf(stderr, "%s: out of memory for %s\n", progname, s); |
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exit(1); |
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} |
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|
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|
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printsources() /* print out glare sources */ |
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{ |
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register struct source *sp; |
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|
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printf("BEGIN glare source\n"); |
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for (sp = donelist; sp != NULL; sp = sp->next) |
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printf("\t%f %f %f\t%f\t%f\n", |
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sp->dir[0], sp->dir[1], sp->dir[2], |
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sp->dom, sp->brt); |
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printf("END glare source\n"); |
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} |
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|
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|
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printillum() /* print out indirect illuminances */ |
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{ |
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register int i; |
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|
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printf("BEGIN indirect illuminance\n"); |
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for (i = 0; i < nglardirs; i++) |
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if (indirect[i].n > FTINY) |
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printf("\t%.0f\t%f\n", (180.0/PI)*indirect[i].theta, |
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PI * indirect[i].sum / indirect[i].n); |
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printf("END indirect illuminance\n"); |
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} |
