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greg |
2.1 |
#ifndef lint
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static const char RCSid[] = "$Id$";
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#endif
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/*
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* Compute sensor signal based on spatial sensitivity.
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*
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* Created Feb 2008 for Architectural Energy Corp.
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*/
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#include "ray.h"
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#include "source.h"
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#include "view.h"
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#include "random.h"
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#define DEGREE (PI/180.)
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#define MAXNT 180 /* maximum number of theta divisions */
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#define MAXNP 360 /* maximum number of phi divisions */
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extern char *progname; /* global argv[0] */
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extern int nowarn; /* don't report warnings? */
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/* current sensor's perspective */
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VIEW ourview = STDVIEW;
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unsigned long nsamps = 10000; /* desired number of initial samples */
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unsigned long nssamps = 9000; /* number of super-samples */
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int ndsamps = 16; /* number of direct samples */
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int nprocs = 1; /* number of rendering processes */
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float *sensor = NULL; /* current sensor data */
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int sntp[2]; /* number of sensor theta and phi angles */
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float maxtheta; /* maximum theta value for this sensor */
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float tvals[MAXNT+1]; /* theta values (1-D table of 1-cos(t)) */
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float *pvals = NULL; /* phi values (2-D table in radians) */
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int ntheta = 0; /* polar angle divisions */
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int nphi = 0; /* azimuthal angle divisions */
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double gscale = 1.; /* global scaling value */
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static void comp_sensor(char *sfile);
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static void
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print_defaults()
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{
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printf("-n %-9d\t\t\t# number of processes\n", nprocs);
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printf("-rd %-9ld\t\t\t# ray directions\n", nsamps);
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/* printf("-rs %-9ld\t\t\t# ray super-samples\n", nssamps); */
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printf("-dn %-9d\t\t\t# direct number of samples\n", ndsamps);
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printf("-vp %f %f %f\t# view point\n",
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ourview.vp[0], ourview.vp[1], ourview.vp[2]);
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printf("-vd %f %f %f\t# view direction\n",
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ourview.vdir[0], ourview.vdir[1], ourview.vdir[2]);
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printf("-vu %f %f %f\t# view up\n",
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ourview.vup[0], ourview.vup[1], ourview.vup[2]);
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printf("-vo %f\t\t\t# view fore clipping distance\n", ourview.vfore);
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print_rdefaults();
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}
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int
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main(
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int argc,
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char *argv[]
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)
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{
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int doheader = 1;
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int i, rval;
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progname = argv[0];
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/* set up rendering defaults */
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dstrsrc = 0.25;
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directrelay = 3;
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ambounce = 1;
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/* just asking defaults? */
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if (argc == 2 && !strcmp(argv[1], "-defaults")) {
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print_defaults();
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return(0);
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}
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/* check octree */
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if (argc < 2 || argv[argc-1][0] == '-')
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error(USER, "missing octree argument");
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/* get options from command line */
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for (i = 1; i < argc-1; i++) {
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while ((rval = expandarg(&argc, &argv, i)) > 0)
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;
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if (rval < 0) {
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sprintf(errmsg, "cannot expand '%s'", argv[i]);
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error(SYSTEM, errmsg);
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}
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if (argv[i][0] != '-') { /* process a sensor file */
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if (!ray_pnprocs) {
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/* overriding options */
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directvis = (ndsamps <= 0);
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do_irrad = 0;
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if (doheader) { /* print header */
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printargs(argc, argv, stdout);
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fputformat("ascii", stdout);
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putchar('\n');
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}
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/* start process(es) */
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ray_pinit(argv[argc-1], nprocs);
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}
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comp_sensor(argv[i]);
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continue;
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}
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if (argv[i][1] == 'r') { /* sampling options */
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if (argv[i][2] == 'd')
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nsamps = atol(argv[++i]);
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else if (argv[i][2] == 's')
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nssamps = atol(argv[++i]);
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else {
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sprintf(errmsg, "bad option at '%s'", argv[i]);
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error(USER, errmsg);
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}
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continue;
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}
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/* direct component samples */
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if (argv[i][1] == 'd' && argv[i][2] == 'n') {
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ndsamps = atoi(argv[++i]);
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continue;
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}
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if (argv[i][1] == 'v') { /* next sensor view */
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if (argv[i][2] == 'f') {
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rval = viewfile(argv[++i], &ourview, NULL);
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if (rval < 0) {
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sprintf(errmsg,
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"cannot open view file \"%s\"",
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argv[i]);
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error(SYSTEM, errmsg);
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} else if (rval == 0) {
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sprintf(errmsg,
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"bad view file \"%s\"",
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argv[i]);
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error(USER, errmsg);
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}
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continue;
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}
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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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continue;
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}
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sprintf(errmsg, "bad view option at '%s'", argv[i]);
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error(USER, errmsg);
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}
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if (!strcmp(argv[i], "-w")) { /* turn off warnings */
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nowarn = 1;
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continue;
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}
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if (ray_pnprocs) {
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error(WARNING,
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"rendering options should appear before first sensor");
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} else if (!strcmp(argv[i], "-defaults")) {
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print_defaults();
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return(0);
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}
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if (argv[i][1] == 'h') { /* header toggle */
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doheader = !doheader;
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continue;
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}
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if (!strcmp(argv[i], "-n")) { /* number of processes */
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nprocs = atoi(argv[++i]);
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if (nprocs <= 0)
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error(USER, "illegal number of processes");
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continue;
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}
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rval = getrenderopt(argc-i, argv+i);
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if (rval < 0) {
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sprintf(errmsg, "bad render option at '%s'", argv[i]);
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error(USER, errmsg);
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}
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i += rval;
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}
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quit(0);
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}
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/* Load sensor sensitivities (first row and column are angles) */
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static float *
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load_sensor(
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int ntp[2],
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char *sfile
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)
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{
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char linebuf[8192];
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int nelem = 1000;
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float *sarr = (float *)malloc(sizeof(float)*nelem);
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FILE *fp;
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char *cp;
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int i;
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fp = frlibopen(sfile);
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if (fp == NULL) {
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sprintf(errmsg, "cannot open sensor file '%s'", sfile);
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error(SYSTEM, errmsg);
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}
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fgets(linebuf, sizeof(linebuf), fp);
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if (!strncmp(linebuf, "Elevation ", 10))
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fgets(linebuf, sizeof(linebuf), fp);
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/* get phi values */
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sarr[0] = .0f;
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if (strncmp(linebuf, "degrees", 7)) {
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sprintf(errmsg, "Missing 'degrees' in sensor file '%s'", sfile);
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error(USER, errmsg);
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}
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cp = sskip(linebuf);
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ntp[1] = 0;
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for ( ; ; ) {
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sarr[ntp[1]+1] = atof(cp);
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cp = fskip(cp);
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if (cp == NULL)
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break;
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++ntp[1];
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}
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ntp[0] = 0; /* get thetas + data */
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while (fgets(linebuf, sizeof(linebuf), fp) != NULL) {
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++ntp[0];
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if ((ntp[0]+1)*(ntp[1]+1) > nelem) {
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nelem += (nelem>>2) + ntp[1];
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sarr = (float *)realloc((void *)sarr,
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sizeof(float)*nelem);
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if (sarr == NULL)
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error(SYSTEM, "out of memory in load_sensor()");
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}
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cp = linebuf;
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i = ntp[0]*(ntp[1]+1);
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for ( ; ; ) {
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sarr[i] = atof(cp);
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cp = fskip(cp);
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if (cp == NULL)
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break;
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++i;
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}
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if (i == ntp[0]*(ntp[1]+1))
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break;
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if (i != (ntp[0]+1)*(ntp[1]+1)) {
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sprintf(errmsg,
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"bad column count near line %d in sensor file '%s'",
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ntp[0]+1, sfile);
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error(USER, errmsg);
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}
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}
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nelem = i;
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fclose(fp);
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errmsg[0] = '\0'; /* sanity checks */
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if (ntp[0] <= 0)
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sprintf(errmsg, "no data in sensor file '%s'", sfile);
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else if (fabs(sarr[ntp[1]+1]) > FTINY)
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sprintf(errmsg, "minimum theta must be 0 in sensor file '%s'",
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sfile);
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else if (fabs(sarr[1]) > FTINY)
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sprintf(errmsg, "minimum phi must be 0 in sensor file '%s'",
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sfile);
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| 253 |
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else if (sarr[ntp[1]] <= FTINY)
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| 254 |
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sprintf(errmsg,
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"maximum phi must be positive in sensor file '%s'",
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sfile);
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| 257 |
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else if (sarr[ntp[0]*(ntp[1]+1)] <= FTINY)
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| 258 |
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sprintf(errmsg,
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| 259 |
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"maximum theta must be positive in sensor file '%s'",
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sfile);
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| 261 |
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if (errmsg[0])
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| 262 |
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error(USER, errmsg);
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| 263 |
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return((float *)realloc((void *)sarr, sizeof(float)*nelem));
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| 264 |
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}
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| 265 |
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| 266 |
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/* Initialize probability table */
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static void
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| 268 |
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init_ptable(
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| 269 |
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char *sfile
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| 270 |
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)
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| 271 |
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{
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| 272 |
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int samptot = nsamps;
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| 273 |
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float *rowp, *rowp1;
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| 274 |
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double rowsum[MAXNT], rowomega[MAXNT];
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| 275 |
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double thdiv[MAXNT+1], phdiv[MAXNP+1];
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| 276 |
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double tsize, psize;
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| 277 |
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double prob, frac, frac1;
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| 278 |
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int i, j, t, p;
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| 279 |
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/* free old table */
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| 280 |
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if (sensor != NULL)
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| 281 |
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free((void *)sensor);
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| 282 |
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if (pvals != NULL)
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| 283 |
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free((void *)pvals);
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| 284 |
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if (sfile == NULL || !*sfile) {
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| 285 |
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pvals = NULL;
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| 286 |
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ntheta = nphi = 0;
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| 287 |
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return;
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| 288 |
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}
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| 289 |
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/* load sensor table */
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| 290 |
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sensor = load_sensor(sntp, sfile);
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| 291 |
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if (sntp[0] > MAXNT) {
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| 292 |
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sprintf(errmsg, "Too many theta rows in sensor file '%s'",
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| 293 |
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sfile);
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| 294 |
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error(INTERNAL, errmsg);
|
| 295 |
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}
|
| 296 |
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if (sntp[1] > MAXNP) {
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| 297 |
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sprintf(errmsg, "Too many phi columns in sensor file '%s'",
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| 298 |
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sfile);
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| 299 |
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error(INTERNAL, errmsg);
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| 300 |
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}
|
| 301 |
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/* compute boundary angles */
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| 302 |
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maxtheta = 1.5f*sensor[sntp[0]*(sntp[1]+1)] -
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| 303 |
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0.5f*sensor[sntp[0]*sntp[1]];
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| 304 |
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thdiv[0] = .0;
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| 305 |
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for (t = 1; t < sntp[0]; t++)
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| 306 |
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thdiv[t] = DEGREE/2.*(sensor[t*(sntp[1]+1)] +
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| 307 |
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sensor[(t+1)*(sntp[1]+1)]);
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| 308 |
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thdiv[sntp[0]] = maxtheta*DEGREE;
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| 309 |
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phdiv[0] = .0;
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| 310 |
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for (p = 1; p < sntp[1]; p++)
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| 311 |
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phdiv[p] = DEGREE/2.*(sensor[p] + sensor[p+1]);
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| 312 |
|
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phdiv[sntp[1]] = 2.*PI;
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| 313 |
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/* size our table */
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| 314 |
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tsize = 1. - cos(maxtheta*DEGREE);
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| 315 |
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psize = PI*tsize/maxtheta;
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| 316 |
|
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if (sntp[0]*sntp[1] < samptot) /* don't overdo resolution */
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| 317 |
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samptot = sntp[0]*sntp[1];
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| 318 |
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ntheta = (int)(sqrt(samptot*tsize/psize) + 0.5);
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| 319 |
|
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if (ntheta > MAXNT)
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| 320 |
|
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ntheta = MAXNT;
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| 321 |
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nphi = samptot/ntheta;
|
| 322 |
|
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pvals = (float *)malloc(sizeof(float)*ntheta*(nphi+1));
|
| 323 |
|
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if (pvals == NULL)
|
| 324 |
|
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error(SYSTEM, "out of memory in init_ptable()");
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| 325 |
|
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gscale = .0; /* compute our inverse table */
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| 326 |
|
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for (i = 0; i < sntp[0]; i++) {
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| 327 |
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rowp = sensor + (i+1)*(sntp[1]+1) + 1;
|
| 328 |
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rowsum[i] = 0.;
|
| 329 |
|
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for (j = 0; j < sntp[1]; j++)
|
| 330 |
|
|
rowsum[i] += *rowp++;
|
| 331 |
|
|
rowomega[i] = cos(thdiv[i]) - cos(thdiv[i+1]);
|
| 332 |
|
|
rowomega[i] *= 2.*PI / (double)sntp[1];
|
| 333 |
|
|
gscale += rowsum[i] * rowomega[i];
|
| 334 |
|
|
}
|
| 335 |
|
|
tvals[0] = .0f;
|
| 336 |
|
|
for (i = 1; i < ntheta; i++) {
|
| 337 |
|
|
prob = (double)i / (double)ntheta;
|
| 338 |
|
|
for (t = 0; t < sntp[0]; t++)
|
| 339 |
|
|
if ((prob -= rowsum[t]*rowomega[t]/gscale) <= .0)
|
| 340 |
|
|
break;
|
| 341 |
|
|
if (t >= sntp[0])
|
| 342 |
|
|
error(INTERNAL, "code error 1 in init_ptable()");
|
| 343 |
|
|
frac = 1. + prob/(rowsum[t]*rowomega[t]/gscale);
|
| 344 |
|
|
tvals[i] = 1. - ( (1.-frac)*cos(thdiv[t]) +
|
| 345 |
|
|
frac*cos(thdiv[t+1]) );
|
| 346 |
|
|
pvals[i*(nphi+1)] = .0f;
|
| 347 |
|
|
for (j = 1; j < nphi; j++) {
|
| 348 |
|
|
prob = (double)j / (double)nphi;
|
| 349 |
|
|
rowp = sensor + t*(sntp[1]+1) + 1;
|
| 350 |
|
|
rowp1 = rowp + sntp[1]+1;
|
| 351 |
|
|
for (p = 0; p < sntp[1]; p++) {
|
| 352 |
|
|
if ((prob -= (1.-frac)*rowp[p]/rowsum[t-1] +
|
| 353 |
|
|
frac*rowp1[p]/rowsum[t]) <= .0)
|
| 354 |
|
|
break;
|
| 355 |
|
|
if (p >= sntp[1])
|
| 356 |
|
|
error(INTERNAL,
|
| 357 |
|
|
"code error 2 in init_ptable()");
|
| 358 |
|
|
frac1 = 1. + prob/((1.-frac)*rowp[p]/rowsum[t-1]
|
| 359 |
|
|
+ frac*rowp1[p]/rowsum[t]);
|
| 360 |
|
|
pvals[i*(nphi+1) + j] = (1.-frac1)*phdiv[p] +
|
| 361 |
|
|
frac1*phdiv[p+1];
|
| 362 |
|
|
}
|
| 363 |
|
|
}
|
| 364 |
|
|
pvals[i*(nphi+1) + nphi] = (float)(2.*PI);
|
| 365 |
|
|
}
|
| 366 |
|
|
tvals[ntheta] = (float)tsize;
|
| 367 |
|
|
}
|
| 368 |
|
|
|
| 369 |
|
|
/* Get normalized direction from random variables in [0,1) range */
|
| 370 |
|
|
static void
|
| 371 |
|
|
get_direc(
|
| 372 |
|
|
FVECT dvec,
|
| 373 |
|
|
double x,
|
| 374 |
|
|
double y
|
| 375 |
|
|
)
|
| 376 |
|
|
{
|
| 377 |
|
|
double xfrac = x*ntheta;
|
| 378 |
|
|
int tndx = (int)xfrac;
|
| 379 |
|
|
double yfrac = y*nphi;
|
| 380 |
|
|
int pndx = (int)yfrac;
|
| 381 |
|
|
double rad, phi;
|
| 382 |
|
|
FVECT dv;
|
| 383 |
|
|
int i;
|
| 384 |
|
|
|
| 385 |
|
|
xfrac -= (double)tndx;
|
| 386 |
|
|
yfrac -= (double)pndx;
|
| 387 |
|
|
pndx += tndx*(nphi+1);
|
| 388 |
|
|
|
| 389 |
|
|
dv[2] = 1. - ((1.-xfrac)*tvals[tndx] + xfrac*tvals[tndx+1]);
|
| 390 |
|
|
rad = sqrt(1. - dv[2]*dv[2]);
|
| 391 |
|
|
phi = (1.-yfrac)*pvals[pndx] + yfrac*pvals[pndx+1];
|
| 392 |
|
|
dv[0] = -rad*sin(phi);
|
| 393 |
|
|
dv[1] = rad*cos(phi);
|
| 394 |
|
|
for (i = 3; i--; )
|
| 395 |
|
|
dvec[i] = dv[0]*ourview.hvec[i] +
|
| 396 |
|
|
dv[1]*ourview.vvec[i] +
|
| 397 |
|
|
dv[2]*ourview.vdir[i] ;
|
| 398 |
|
|
}
|
| 399 |
|
|
|
| 400 |
|
|
/* Get sensor value in the specified direction (normalized) */
|
| 401 |
|
|
static float
|
| 402 |
|
|
sens_val(
|
| 403 |
|
|
FVECT dvec
|
| 404 |
|
|
)
|
| 405 |
|
|
{
|
| 406 |
|
|
FVECT dv;
|
| 407 |
|
|
float theta, phi;
|
| 408 |
|
|
int t, p;
|
| 409 |
|
|
|
| 410 |
|
|
dv[2] = DOT(dvec, ourview.vdir);
|
| 411 |
|
|
theta = (float)((1./DEGREE) * acos(dv[2]));
|
| 412 |
|
|
if (theta >= maxtheta)
|
| 413 |
|
|
return(.0f);
|
| 414 |
|
|
dv[0] = DOT(dvec, ourview.hvec);
|
| 415 |
|
|
dv[1] = DOT(dvec, ourview.vvec);
|
| 416 |
|
|
phi = (float)((1./DEGREE) * atan2(-dv[0], dv[1]));
|
| 417 |
|
|
while (phi < .0f) phi += 360.f;
|
| 418 |
|
|
t = (int)(theta/maxtheta * sntp[0]);
|
| 419 |
|
|
p = (int)(phi*(1./360.) * sntp[1]);
|
| 420 |
|
|
/* hack for non-uniform sensor grid */
|
| 421 |
|
|
while (t+1 < sntp[0] && theta >= sensor[(t+2)*(sntp[1]+1)])
|
| 422 |
|
|
++t;
|
| 423 |
|
|
while (t-1 >= 0 && theta < sensor[t*(sntp[1]+1)])
|
| 424 |
|
|
--t;
|
| 425 |
|
|
while (p+1 < sntp[1] && phi >= sensor[p+2])
|
| 426 |
|
|
++p;
|
| 427 |
|
|
while (p-1 >= 0 && phi < sensor[p])
|
| 428 |
|
|
--p;
|
| 429 |
|
|
return(sensor[t*(sntp[1]+1) + p + 1]);
|
| 430 |
|
|
}
|
| 431 |
|
|
|
| 432 |
|
|
/* Compute sensor output */
|
| 433 |
|
|
static void
|
| 434 |
|
|
comp_sensor(
|
| 435 |
|
|
char *sfile
|
| 436 |
|
|
)
|
| 437 |
|
|
{
|
| 438 |
|
|
int ndirs = dstrsrc > FTINY ? ndsamps :
|
| 439 |
|
|
ndsamps > 0 ? 1 : 0;
|
| 440 |
|
|
char *err;
|
| 441 |
|
|
int nt, np;
|
| 442 |
|
|
COLOR vsum;
|
| 443 |
|
|
RAY rr;
|
| 444 |
|
|
int i, j;
|
| 445 |
|
|
/* set view */
|
| 446 |
|
|
ourview.type = VT_ANG;
|
| 447 |
|
|
ourview.horiz = ourview.vert = 180.;
|
| 448 |
|
|
ourview.hoff = ourview.voff = .0;
|
| 449 |
|
|
err = setview(&ourview);
|
| 450 |
|
|
if (err != NULL)
|
| 451 |
|
|
error(USER, err);
|
| 452 |
|
|
/* assign probability table */
|
| 453 |
|
|
init_ptable(sfile);
|
| 454 |
|
|
/* do Monte Carlo sampling */
|
| 455 |
|
|
setcolor(vsum, .0f, .0f, .0f);
|
| 456 |
|
|
nt = (int)(sqrt((double)nsamps*ntheta/nphi) + .5);
|
| 457 |
|
|
np = nsamps/nt;
|
| 458 |
|
|
VCOPY(rr.rorg, ourview.vp);
|
| 459 |
|
|
rr.rmax = .0;
|
| 460 |
|
|
for (i = 0; i < nt; i++)
|
| 461 |
|
|
for (j =0; j < np; j++) {
|
| 462 |
|
|
get_direc(rr.rdir, (i+frandom())/nt,
|
| 463 |
|
|
(j + frandom())/np);
|
| 464 |
|
|
rayorigin(&rr, PRIMARY, NULL, NULL);
|
| 465 |
|
|
if (ray_pqueue(&rr) == 1)
|
| 466 |
|
|
addcolor(vsum, rr.rcol);
|
| 467 |
|
|
}
|
| 468 |
|
|
/* finish MC calculation */
|
| 469 |
|
|
while (ray_presult(&rr, 0) > 0)
|
| 470 |
|
|
addcolor(vsum, rr.rcol);
|
| 471 |
|
|
scalecolor(vsum, gscale/(nt*np));
|
| 472 |
|
|
/* compute direct component */
|
| 473 |
|
|
for (i = ndirs; i-- > 0; ) {
|
| 474 |
|
|
SRCINDEX si;
|
| 475 |
|
|
initsrcindex(&si);
|
| 476 |
|
|
while (srcray(&rr, NULL, &si)) {
|
| 477 |
|
|
double d = sens_val(rr.rdir);
|
| 478 |
|
|
if (d <= FTINY)
|
| 479 |
|
|
continue;
|
| 480 |
|
|
d *= si.dom/ndirs;
|
| 481 |
|
|
scalecolor(rr.rcoef, d);
|
| 482 |
|
|
if (ray_pqueue(&rr) == 1) {
|
| 483 |
|
|
multcolor(rr.rcol, rr.rcoef);
|
| 484 |
|
|
addcolor(vsum, rr.rcol);
|
| 485 |
|
|
}
|
| 486 |
|
|
}
|
| 487 |
|
|
}
|
| 488 |
|
|
/* finish direct calculation */
|
| 489 |
|
|
while (ray_presult(&rr, 0) > 0) {
|
| 490 |
|
|
multcolor(rr.rcol, rr.rcoef);
|
| 491 |
|
|
addcolor(vsum, rr.rcol);
|
| 492 |
|
|
}
|
| 493 |
|
|
/* print our result */
|
| 494 |
|
|
printf("%.4e %.4e %.4e\n", colval(vsum,RED),
|
| 495 |
|
|
colval(vsum,GRN), colval(vsum,BLU));
|
| 496 |
|
|
}
|
