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/* Copyright (c) 1991 Regents of the University of California */
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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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* 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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#include "glare.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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char *rtargv[32] = {"rtrace", "-h", "-ov", "-fff"};
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int rtargc = 4;
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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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char *picture = NULL; /* picture file name */
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char *octree = NULL; /* octree file name */
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int verbose = 0; /* verbose reporting */
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char *progname; /* global argv[0] */
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double threshold = 0.; /* glare threshold */
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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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int hlim; /* central limit of horizontal */
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struct illum *indirect; /* array of indirect illuminances */
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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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main(argc, argv)
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int argc;
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char *argv[];
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{
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int gotview = 0;
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int rval, i;
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char *err;
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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 'd':
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case 'l':
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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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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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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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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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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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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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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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hlim = sampdens*maxtheta;
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hsize = hlim + 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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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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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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FVECT org; /* dummy variable */
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if (x <= -hlim) /* left region */
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return(viewray(org, vd, &leftview,
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(double)(x+hlim)/(2*sampdens)+.5,
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(double)y/(2*sampdens)+.5));
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if (x >= hlim) /* right region */
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return(viewray(org, vd, &rightview,
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(double)(x-hlim)/(2*sampdens)+.5,
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(double)y/(2*sampdens)+.5));
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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));
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return(0);
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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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printsources() /* print out glare sources */
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{
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register struct source *sp;
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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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printillum() /* print out indirect illuminances */
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{
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register int i;
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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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}
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