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greg |
2.1 |
// Main function for generating spectral sky |
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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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#include "view.h" |
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char *progname; |
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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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const int SUMMER_END = 9; |
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const double GNORM = 0.777778; |
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const double D65EFF = 203.; /* standard illuminant D65 */ |
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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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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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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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// 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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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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setview(&grndview); |
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CNDX[3] = NSSAMP; |
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FVECT view_point = {0, 0, ER}; |
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const double radius = VLEN(view_point); |
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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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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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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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const double mu_grnd = fdot(view_point, rdir_grnd) / radius; |
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const double nu_grnd = fdot(rdir_grnd, sundir); |
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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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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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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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} |
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if (cloud_cover > 0) { |
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double zenithbr = get_zenith_brightness(sundir); |
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double grndbr = zenithbr * GNORM; |
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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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} |
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} |
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scolor2scolr(sky_sclr, sky_radiance, 20); |
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putbinary(sky_sclr, LSCOLR, 1, skyfp); |
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scolor2scolr(ground_sclr, ground_radiance, 20); |
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putbinary(ground_sclr, LSCOLR, 1, grndfp); |
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} |
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} |
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fclose(skyfp); |
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fclose(grndfp); |
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| 183 |
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// Get solar radiance |
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double sun_radiance[NSSAMP] = {0}; |
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get_solar_radiance(tau_clear, scat_clear, scat1m_clear, sundir, radius, |
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sun_ct, sun_radiance); |
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if (cloud_cover > 0) { |
| 188 |
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double zenithbr = get_zenith_brightness(sundir); |
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double skybr = get_overcast_brightness(sundir[2], zenithbr); |
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for (int i = 0; i < NSSAMP; ++i) { |
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sun_radiance[i] = |
| 192 |
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wmean2(sun_radiance[i], D6415[i] * skybr / WVLSPAN, cloud_cover); |
| 193 |
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} |
| 194 |
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} |
| 195 |
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| 196 |
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FILE *rfp = fopen(radfile, "w"); |
| 197 |
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write_rad_file(rfp, sun_radiance, sundir, skyfile, grndfile); |
| 198 |
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fclose(rfp); |
| 199 |
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return 1; |
| 200 |
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} |
| 201 |
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| 202 |
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static DpPaths get_dppaths(const double aod, const char *tag) { |
| 203 |
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DpPaths paths; |
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snprintf(paths.tau, PATH_MAX, "tau_%s_%.2f.dat", tag, aod); |
| 206 |
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snprintf(paths.scat, PATH_MAX, "scat_%s_%.2f.dat", tag, aod); |
| 207 |
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snprintf(paths.scat1m, PATH_MAX, "scat1m_%s_%.2f.dat", tag, aod); |
| 208 |
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snprintf(paths.irrad, PATH_MAX, "irrad_%s_%.2f.dat", tag, aod); |
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| 210 |
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return paths; |
| 211 |
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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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const double s_latitude) { |
| 215 |
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// Set rayleigh density profile |
| 216 |
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if (fabs(s_latitude*180.0 / PI) > ARCTIC_LAT) { |
| 217 |
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tag[0] = 's'; |
| 218 |
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if (is_summer) { |
| 219 |
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tag[1] = 's'; |
| 220 |
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atmos->rayleigh_density.layers[0].exp_scale = -1.0 / HR_SS; |
| 221 |
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atmos->beta_r0 = BR0_SS; |
| 222 |
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} else { |
| 223 |
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tag[1] = 'w'; |
| 224 |
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atmos->rayleigh_density.layers[0].exp_scale = -1.0 / HR_SW; |
| 225 |
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atmos->beta_r0 = BR0_SW; |
| 226 |
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} |
| 227 |
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} else if (fabs(s_latitude*180.0/PI) > TROPIC_LAT) { |
| 228 |
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tag[0] = 'm'; |
| 229 |
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if (is_summer) { |
| 230 |
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tag[1] = 's'; |
| 231 |
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atmos->rayleigh_density.layers[0].exp_scale = -1.0 / HR_MS; |
| 232 |
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atmos->beta_r0 = BR0_MS; |
| 233 |
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} else { |
| 234 |
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tag[1] = 'w'; |
| 235 |
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atmos->rayleigh_density.layers[0].exp_scale = -1.0 / HR_MW; |
| 236 |
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atmos->beta_r0 = BR0_MW; |
| 237 |
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} |
| 238 |
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} else { |
| 239 |
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tag[0] = 't'; |
| 240 |
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tag[1] = 'r'; |
| 241 |
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atmos->rayleigh_density.layers[0].exp_scale = -1.0 / HR_T; |
| 242 |
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atmos->beta_r0 = BR0_T; |
| 243 |
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} |
| 244 |
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tag[2] = '\0'; |
| 245 |
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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 = |
| 250 |
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{ |
| 251 |
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{.width = 25000.0, |
| 252 |
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.exp_term = 0.0, |
| 253 |
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.exp_scale = 0.0, |
| 254 |
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.linear_term = 1.0 / 15000.0, |
| 255 |
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.constant_term = -2.0 / 3.0}, |
| 256 |
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{.width = AH, |
| 257 |
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.exp_term = 0.0, |
| 258 |
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.exp_scale = 0.0, |
| 259 |
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.linear_term = -1.0 / 15000.0, |
| 260 |
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.constant_term = 8.0 / 3.0}, |
| 261 |
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}}, |
| 262 |
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.rayleigh_density = {.layers = |
| 263 |
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{ |
| 264 |
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{.width = AH, |
| 265 |
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.exp_term = 1.0, |
| 266 |
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.exp_scale = -1.0 / HR_MS, |
| 267 |
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.linear_term = 0.0, |
| 268 |
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.constant_term = 0.0}, |
| 269 |
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}}, |
| 270 |
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.beta_r0 = BR0_MS, |
| 271 |
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.beta_scale = aod / AOD0_CA, |
| 272 |
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.beta_m = NULL, |
| 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 |
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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 |
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return 0; |
| 299 |
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} |
| 300 |
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| 301 |
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month = atoi(argv[1]); |
| 302 |
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day = atoi(argv[2]); |
| 303 |
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hour = atof(argv[3]); |
| 304 |
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| 305 |
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if (!compute_sundir(year, month, day, hour, tsolar, sundir)) { |
| 306 |
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fprintf(stderr, "Cannot compute solar angle\n"); |
| 307 |
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exit(1); |
| 308 |
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} |
| 309 |
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| 310 |
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for (int i = 4; i < argc; i++) { |
| 311 |
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if (argv[i][0] == '-') { |
| 312 |
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switch (argv[i][1]) { |
| 313 |
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case 'a': |
| 314 |
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s_latitude = atof(argv[++i]) * (PI / 180.0); |
| 315 |
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break; |
| 316 |
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case 'g': |
| 317 |
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grefl = atof(argv[++i]); |
| 318 |
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break; |
| 319 |
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case 'c': |
| 320 |
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ccover = atof(argv[++i]); |
| 321 |
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break; |
| 322 |
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case 'd': |
| 323 |
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aod = atof(argv[++i]); |
| 324 |
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break; |
| 325 |
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case 'i': |
| 326 |
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sorder = atoi(argv[++i]); |
| 327 |
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break; |
| 328 |
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|
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 |
|
|
} |
