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greg |
2.1 |
// Main function for generating spectral sky
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| 2 |
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// Cloudy sky computed as weight average of clear and cie overcast sky
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#include "copyright.h"
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#include "atmos.h"
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#include "resolu.h"
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| 7 |
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#include "view.h"
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| 8 |
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| 10 |
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char *progname;
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| 11 |
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| 12 |
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const double ARCTIC_LAT = 67.;
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const double TROPIC_LAT = 23.;
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const int SUMMER_START = 4;
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| 15 |
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const int SUMMER_END = 9;
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const double GNORM = 0.777778;
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| 18 |
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const double D65EFF = 203.; /* standard illuminant D65 */
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| 20 |
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// Mean normalized relative daylight spectra where CCT = 6415K for overcast;
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const double D6415[NSSAMP] = {0.63231, 1.06171, 1.00779, 1.36423, 1.34133,
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1.27258, 1.26276, 1.26352, 1.22201, 1.13246,
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1.0434, 1.05547, 0.98212, 0.94445, 0.9722,
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0.82387, 0.87853, 0.82559, 0.75111, 0.78925};
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| 26 |
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static inline double wmean2(const double a, const double b, const double x) {
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return a * (1 - x) + b * x;
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}
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static inline double wmean(const double a, const double x, const double b,
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const double y) {
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return (a * x + b * y) / (a + b);
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}
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| 35 |
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static double get_zenith_brightness(const double sundir[3]) {
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double zenithbr;
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if (sundir[2] < 0) {
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zenithbr = 0;
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} else {
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zenithbr = (8.6 * sundir[2] + .123) * 1000.0 / D65EFF;
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}
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return zenithbr;
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}
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| 45 |
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// from gensky.c
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static double get_overcast_brightness(const double dz, const double zenithbr) {
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double groundbr = zenithbr * GNORM;
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return wmean(pow(dz + 1.01, 10), zenithbr * (1 + 2 * dz) / 3,
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pow(dz + 1.01, -10), groundbr);
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}
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| 52 |
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static void write_rad_file(FILE *fp, const double *sun_radiance,
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const FVECT sundir, const char skyfile[PATH_MAX],
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const char grndfile[PATH_MAX]) {
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if (sundir[2] > 0) {
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fprintf(fp, "void spectrum sunrad\n0\n0\n22 380 780 ");
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for (int i = 0; i < NSSAMP; ++i) {
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fprintf(fp, "%.1f ", sun_radiance[i] * WVLSPAN);
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}
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fprintf(fp, "\n\nsunrad light solar\n0\n0\n3 1 1 1\n\n");
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fprintf(fp, "solar source sun\n0\n0\n4 %f %f %f 0.533\n\n", sundir[0],
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sundir[1], sundir[2]);
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}
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fprintf(fp,
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"void specpict skyfunc\n8 noop %s fisheye.cal fish_u fish_v -rx 90 "
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"-mx\n0\n0\n\n",
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skyfile);
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fprintf(fp, "skyfunc glow sky_glow\n0\n0\n4 1 1 1 0\n\n");
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fprintf(fp, "sky_glow source sky\n0\n0\n4 0 0 1 180\n\n");
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fprintf(fp,
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"void specpict grndmap\n8 noop %s fisheye.cal fish_u fish_v -rx -90 "
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"-my\n0\n0\n\n",
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grndfile);
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fprintf(fp, "grndmap glow ground_glow\n0\n0\n4 1 1 1 0\n\n");
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fprintf(fp, "ground_glow source ground_source\n0\n0\n4 0 0 -1 180\n\n");
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}
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static void write_hsr_header(FILE *fp, RESOLU *res) {
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float wvsplit[4] = {380, 480, 588,
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780}; // RGB wavelength limits+partitions (nm)
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newheader("RADIANCE", fp);
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fputncomp(NSSAMP, fp);
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fputwlsplit(wvsplit, fp);
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fputformat(SPECFMT, fp);
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fputc('\n', fp);
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fputsresolu(res, fp);
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}
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int gen_spect_sky(DATARRAY *tau_clear, DATARRAY *scat_clear,
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DATARRAY *scat1m_clear, DATARRAY *irrad_clear,
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const double cloud_cover, const FVECT sundir,
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const double grefl, const int res, const char *outname) {
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char radfile[PATH_MAX];
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char skyfile[PATH_MAX];
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char grndfile[PATH_MAX];
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if (!snprintf(radfile, sizeof(radfile), "%s.rad", outname)) {
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fprintf(stderr, "Error setting rad file name\n");
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return 0;
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};
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if (!snprintf(skyfile, sizeof(skyfile), "%s_sky.hsr", outname)) {
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fprintf(stderr, "Error setting sky file name\n");
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return 0;
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};
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if (!snprintf(grndfile, sizeof(grndfile), "%s_ground.hsr", outname)) {
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fprintf(stderr, "Error setting ground file name\n");
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return 0;
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}
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RESOLU rs = {PIXSTANDARD, res, res};
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FILE *skyfp = fopen(skyfile, "w");
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FILE *grndfp = fopen(grndfile, "w");
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write_hsr_header(grndfp, &rs);
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write_hsr_header(skyfp, &rs);
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VIEW skyview = {VT_ANG, {0., 0., 0.}, {0., 0., 1.}, {0., 1., 0.}, 1.,
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180., 180., 0., 0., 0.,
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0., {0., 0., 0.}, {0., 0., 0.}, 0., 0.};
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VIEW grndview = {
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VT_ANG, {0., 0., 0.}, {0., 0., -1.}, {0., 1., 0.}, 1., 180., 180., 0., 0.,
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0., 0., {0., 0., 0.}, {0., 0., 0.}, 0., 0.};
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setview(&skyview);
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| 122 |
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setview(&grndview);
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| 123 |
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| 124 |
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CNDX[3] = NSSAMP;
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| 125 |
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| 126 |
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FVECT view_point = {0, 0, ER};
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| 127 |
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const double radius = VLEN(view_point);
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| 128 |
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const double sun_ct = fdot(view_point, sundir) / radius;
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for (unsigned int j = 0; j < res; ++j) {
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for (unsigned int i = 0; i < res; ++i) {
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RREAL loc[2];
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FVECT rorg = {0};
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| 133 |
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FVECT rdir_sky = {0};
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FVECT rdir_grnd = {0};
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SCOLOR sky_radiance = {0};
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SCOLOR ground_radiance = {0};
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SCOLR sky_sclr = {0};
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SCOLR ground_sclr = {0};
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pix2loc(loc, &rs, i, j);
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viewray(rorg, rdir_sky, &skyview, loc[0], loc[1]);
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viewray(rorg, rdir_grnd, &grndview, loc[0], loc[1]);
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| 143 |
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| 144 |
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const double mu_sky = fdot(view_point, rdir_sky) / radius;
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const double nu_sky = fdot(rdir_sky, sundir);
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| 147 |
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const double mu_grnd = fdot(view_point, rdir_grnd) / radius;
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| 148 |
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const double nu_grnd = fdot(rdir_grnd, sundir);
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| 149 |
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| 150 |
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get_sky_radiance(scat_clear, scat1m_clear, radius, mu_sky, sun_ct, nu_sky,
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sky_radiance);
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| 152 |
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get_ground_radiance(tau_clear, scat_clear, scat1m_clear, irrad_clear,
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view_point, rdir_grnd, radius, mu_grnd, sun_ct,
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nu_grnd, grefl, sundir, ground_radiance);
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| 155 |
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| 156 |
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for (int k = 0; k < NSSAMP; ++k) {
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sky_radiance[k] *= WVLSPAN;
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ground_radiance[k] *= WVLSPAN;
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| 159 |
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}
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| 160 |
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| 161 |
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if (cloud_cover > 0) {
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| 162 |
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double zenithbr = get_zenith_brightness(sundir);
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| 163 |
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double grndbr = zenithbr * GNORM;
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| 164 |
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double skybr = get_overcast_brightness(rdir_sky[2], zenithbr);
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for (int k = 0; k < NSSAMP; ++k) {
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sky_radiance[k] =
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wmean2(sky_radiance[k], skybr * D6415[k], cloud_cover);
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ground_radiance[k] =
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wmean2(ground_radiance[k], grndbr * D6415[k], cloud_cover);
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| 170 |
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}
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| 171 |
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}
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| 172 |
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| 173 |
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scolor2scolr(sky_sclr, sky_radiance, 20);
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putbinary(sky_sclr, LSCOLR, 1, skyfp);
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| 176 |
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scolor2scolr(ground_sclr, ground_radiance, 20);
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| 177 |
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putbinary(ground_sclr, LSCOLR, 1, grndfp);
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| 178 |
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}
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| 179 |
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}
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| 180 |
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fclose(skyfp);
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| 181 |
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fclose(grndfp);
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| 182 |
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| 183 |
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// Get solar radiance
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| 184 |
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double sun_radiance[NSSAMP] = {0};
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| 185 |
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get_solar_radiance(tau_clear, scat_clear, scat1m_clear, sundir, radius,
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| 186 |
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sun_ct, sun_radiance);
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| 187 |
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if (cloud_cover > 0) {
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| 188 |
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double zenithbr = get_zenith_brightness(sundir);
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| 189 |
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double skybr = get_overcast_brightness(sundir[2], zenithbr);
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| 190 |
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for (int i = 0; i < NSSAMP; ++i) {
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| 191 |
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sun_radiance[i] =
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| 192 |
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wmean2(sun_radiance[i], D6415[i] * skybr / WVLSPAN, cloud_cover);
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| 193 |
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}
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| 194 |
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}
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| 195 |
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| 196 |
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FILE *rfp = fopen(radfile, "w");
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| 197 |
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write_rad_file(rfp, sun_radiance, sundir, skyfile, grndfile);
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| 198 |
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fclose(rfp);
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| 199 |
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return 1;
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| 200 |
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}
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| 201 |
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| 202 |
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static DpPaths get_dppaths(const double aod, const char *tag) {
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| 203 |
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DpPaths paths;
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| 204 |
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| 205 |
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snprintf(paths.tau, PATH_MAX, "tau_%s_%.2f.dat", tag, aod);
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| 206 |
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snprintf(paths.scat, PATH_MAX, "scat_%s_%.2f.dat", tag, aod);
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| 207 |
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snprintf(paths.scat1m, PATH_MAX, "scat1m_%s_%.2f.dat", tag, aod);
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| 208 |
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snprintf(paths.irrad, PATH_MAX, "irrad_%s_%.2f.dat", tag, aod);
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| 209 |
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| 210 |
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return paths;
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| 211 |
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}
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| 212 |
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| 213 |
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static void set_rayleigh_density_profile(Atmosphere *atmos, char *tag, const int is_summer,
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| 214 |
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const double s_latitude) {
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| 215 |
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// Set rayleigh density profile
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| 216 |
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if (fabs(s_latitude*180.0 / PI) > ARCTIC_LAT) {
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| 217 |
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tag[0] = 's';
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| 218 |
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if (is_summer) {
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| 219 |
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tag[1] = 's';
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| 220 |
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atmos->rayleigh_density.layers[0].exp_scale = -1.0 / HR_SS;
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| 221 |
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atmos->beta_r0 = BR0_SS;
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| 222 |
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} else {
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| 223 |
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tag[1] = 'w';
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| 224 |
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atmos->rayleigh_density.layers[0].exp_scale = -1.0 / HR_SW;
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| 225 |
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atmos->beta_r0 = BR0_SW;
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| 226 |
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}
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| 227 |
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} else if (fabs(s_latitude*180.0/PI) > TROPIC_LAT) {
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| 228 |
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tag[0] = 'm';
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| 229 |
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if (is_summer) {
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| 230 |
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tag[1] = 's';
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| 231 |
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atmos->rayleigh_density.layers[0].exp_scale = -1.0 / HR_MS;
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| 232 |
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atmos->beta_r0 = BR0_MS;
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| 233 |
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} else {
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| 234 |
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tag[1] = 'w';
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| 235 |
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atmos->rayleigh_density.layers[0].exp_scale = -1.0 / HR_MW;
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| 236 |
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atmos->beta_r0 = BR0_MW;
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| 237 |
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}
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| 238 |
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} else {
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| 239 |
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tag[0] = 't';
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| 240 |
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tag[1] = 'r';
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| 241 |
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atmos->rayleigh_density.layers[0].exp_scale = -1.0 / HR_T;
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| 242 |
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atmos->beta_r0 = BR0_T;
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| 243 |
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}
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| 244 |
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tag[2] = '\0';
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| 245 |
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}
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| 246 |
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| 247 |
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static Atmosphere init_atmos(const double aod, const double grefl) {
|
| 248 |
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Atmosphere atmos = {
|
| 249 |
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.ozone_density = {.layers =
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| 250 |
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{
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| 251 |
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{.width = 25000.0,
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| 252 |
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.exp_term = 0.0,
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| 253 |
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.exp_scale = 0.0,
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| 254 |
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.linear_term = 1.0 / 15000.0,
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| 255 |
|
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.constant_term = -2.0 / 3.0},
|
| 256 |
|
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{.width = AH,
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| 257 |
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.exp_term = 0.0,
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| 258 |
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.exp_scale = 0.0,
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| 259 |
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.linear_term = -1.0 / 15000.0,
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| 260 |
|
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.constant_term = 8.0 / 3.0},
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| 261 |
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}},
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| 262 |
|
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.rayleigh_density = {.layers =
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| 263 |
|
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{
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| 264 |
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{.width = AH,
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| 265 |
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.exp_term = 1.0,
|
| 266 |
|
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.exp_scale = -1.0 / HR_MS,
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| 267 |
|
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.linear_term = 0.0,
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| 268 |
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.constant_term = 0.0},
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| 269 |
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}},
|
| 270 |
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.beta_r0 = BR0_MS,
|
| 271 |
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.beta_scale = aod / AOD0_CA,
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| 272 |
|
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.beta_m = NULL,
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| 273 |
|
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.grefl = grefl
|
| 274 |
|
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};
|
| 275 |
|
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return atmos;
|
| 276 |
|
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}
|
| 277 |
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|
| 278 |
|
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int main(int argc, char *argv[]) {
|
| 279 |
|
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progname = argv[0];
|
| 280 |
|
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int month, day;
|
| 281 |
|
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double hour;
|
| 282 |
|
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FVECT sundir;
|
| 283 |
|
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int num_threads = 1;
|
| 284 |
|
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int sorder = 4;
|
| 285 |
|
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int year = 0;
|
| 286 |
|
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int tsolar = 0;
|
| 287 |
|
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double grefl = 0.2;
|
| 288 |
|
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double ccover = 0.0;
|
| 289 |
|
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int res = 128;
|
| 290 |
|
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double aod = AOD0_CA;
|
| 291 |
|
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char *outname = "out";
|
| 292 |
|
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char *mie_path = getpath("mie_ca.dat", getrlibpath(), R_OK);
|
| 293 |
|
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char lstag[3];
|
| 294 |
|
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|
| 295 |
|
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if (argc < 4) {
|
| 296 |
|
|
fprintf(stderr, "Usage: %s month day hour -y year -a lat -o lon -m tz -d aod -r res -n nproc -c ccover -l mie -g grefl -f outpath\n",
|
| 297 |
|
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argv[0]);
|
| 298 |
|
|
return 0;
|
| 299 |
|
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}
|
| 300 |
|
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|
| 301 |
|
|
month = atoi(argv[1]);
|
| 302 |
|
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day = atoi(argv[2]);
|
| 303 |
|
|
hour = atof(argv[3]);
|
| 304 |
|
|
|
| 305 |
|
|
if (!compute_sundir(year, month, day, hour, tsolar, sundir)) {
|
| 306 |
|
|
fprintf(stderr, "Cannot compute solar angle\n");
|
| 307 |
|
|
exit(1);
|
| 308 |
|
|
}
|
| 309 |
|
|
|
| 310 |
|
|
for (int i = 4; i < argc; i++) {
|
| 311 |
|
|
if (argv[i][0] == '-') {
|
| 312 |
|
|
switch (argv[i][1]) {
|
| 313 |
|
|
case 'a':
|
| 314 |
|
|
s_latitude = atof(argv[++i]) * (PI / 180.0);
|
| 315 |
|
|
break;
|
| 316 |
|
|
case 'g':
|
| 317 |
|
|
grefl = atof(argv[++i]);
|
| 318 |
|
|
break;
|
| 319 |
|
|
case 'c':
|
| 320 |
|
|
ccover = atof(argv[++i]);
|
| 321 |
|
|
break;
|
| 322 |
|
|
case 'd':
|
| 323 |
|
|
aod = atof(argv[++i]);
|
| 324 |
|
|
break;
|
| 325 |
|
|
case 'i':
|
| 326 |
|
|
sorder = atoi(argv[++i]);
|
| 327 |
|
|
break;
|
| 328 |
|
|
case 'l':
|
| 329 |
|
|
mie_path = argv[++i];
|
| 330 |
|
|
break;
|
| 331 |
|
|
case 'm':
|
| 332 |
|
|
s_meridian = atof(argv[++i]) * (PI / 180.0);
|
| 333 |
|
|
break;
|
| 334 |
|
|
case 'o':
|
| 335 |
|
|
s_longitude = atof(argv[++i]) * (PI / 180.0);
|
| 336 |
|
|
break;
|
| 337 |
|
|
case 'n':
|
| 338 |
|
|
num_threads = atoi(argv[++i]);
|
| 339 |
|
|
break;
|
| 340 |
|
|
case 'y':
|
| 341 |
|
|
year = atoi(argv[++i]);
|
| 342 |
|
|
break;
|
| 343 |
|
|
case 'f':
|
| 344 |
|
|
outname = argv[++i];
|
| 345 |
|
|
break;
|
| 346 |
|
|
case 'r':
|
| 347 |
|
|
res = atoi(argv[++i]);
|
| 348 |
|
|
break;
|
| 349 |
|
|
default:
|
| 350 |
|
|
fprintf(stderr, "Unknown option %s\n", argv[i]);
|
| 351 |
|
|
exit(1);
|
| 352 |
|
|
}
|
| 353 |
|
|
}
|
| 354 |
|
|
}
|
| 355 |
|
|
|
| 356 |
|
|
Atmosphere clear_atmos = init_atmos(aod, grefl);
|
| 357 |
|
|
|
| 358 |
|
|
int is_summer = (month >= SUMMER_START && month <= SUMMER_END);
|
| 359 |
|
|
if (s_latitude < 0) {
|
| 360 |
|
|
is_summer = !is_summer;
|
| 361 |
|
|
}
|
| 362 |
|
|
set_rayleigh_density_profile(&clear_atmos, lstag, is_summer, s_latitude);
|
| 363 |
|
|
|
| 364 |
|
|
// Load mie density data
|
| 365 |
|
|
DATARRAY *mie_dp = getdata(mie_path);
|
| 366 |
|
|
if (mie_dp == NULL) {
|
| 367 |
|
|
fprintf(stderr, "Error reading mie data\n");
|
| 368 |
|
|
return 0;
|
| 369 |
|
|
}
|
| 370 |
|
|
clear_atmos.beta_m = mie_dp;
|
| 371 |
|
|
|
| 372 |
|
|
DpPaths clear_paths = get_dppaths(aod, lstag);
|
| 373 |
|
|
|
| 374 |
|
|
if (getpath(clear_paths.tau, ".", R_OK) == NULL ||
|
| 375 |
|
|
getpath(clear_paths.scat, ".", R_OK) == NULL ||
|
| 376 |
|
|
getpath(clear_paths.scat1m, ".", R_OK) == NULL ||
|
| 377 |
|
|
getpath(clear_paths.irrad, ".", R_OK) == NULL) {
|
| 378 |
|
|
printf("# Precomputing...\n");
|
| 379 |
|
|
if (!precompute(sorder, clear_paths, &clear_atmos, num_threads)) {
|
| 380 |
|
|
fprintf(stderr, "Precompute failed\n");
|
| 381 |
|
|
return 0;
|
| 382 |
|
|
}
|
| 383 |
|
|
}
|
| 384 |
|
|
|
| 385 |
|
|
DATARRAY *tau_clear_dp = getdata(clear_paths.tau);
|
| 386 |
|
|
DATARRAY *irrad_clear_dp = getdata(clear_paths.irrad);
|
| 387 |
|
|
DATARRAY *scat_clear_dp = getdata(clear_paths.scat);
|
| 388 |
|
|
DATARRAY *scat1m_clear_dp = getdata(clear_paths.scat1m);
|
| 389 |
|
|
|
| 390 |
|
|
if (!gen_spect_sky(tau_clear_dp, scat_clear_dp, scat1m_clear_dp,
|
| 391 |
|
|
irrad_clear_dp, ccover, sundir, grefl, res, outname)) {
|
| 392 |
|
|
fprintf(stderr, "gen_spect_sky failed\n");
|
| 393 |
|
|
exit(1);
|
| 394 |
|
|
}
|
| 395 |
|
|
|
| 396 |
|
|
freedata(mie_dp);
|
| 397 |
|
|
freedata(tau_clear_dp);
|
| 398 |
|
|
freedata(scat_clear_dp);
|
| 399 |
|
|
freedata(irrad_clear_dp);
|
| 400 |
|
|
freedata(scat1m_clear_dp);
|
| 401 |
|
|
|
| 402 |
|
|
return 1;
|
| 403 |
|
|
}
|
