using System; using System.Collections.Generic; using UnityEngine; namespace BrunetonsImprovedAtmosphere { public enum LUMINANCE { // Render the spectral radiance at kLambdaR, kLambdaG, kLambdaB. NONE, // Render the sRGB luminance, using an approximate (on the fly) conversion // from 3 spectral radiance values only (see section 14.3 in A Qualitative and Quantitative // Evaluation of 8 Clear Sky Models). APPROXIMATE, // Render the sRGB luminance, precomputed from 15 spectral radiance values // (see section 4.4 in Real-time // Spectral Scattering in Large-scale Natural Participating Media). PRECOMPUTED }; /// /// This file defines the size of the precomputed texures used in our atmosphere /// model. It also provides tabulated values of the CIE color matching functions and the conversion matrix from the XYZ to the /// sRGB color spaces (which are /// needed to convert the spectral radiance samples computed by our algorithm to /// sRGB luminance values). /// public static class CONSTANTS { public static readonly int NUM_THREADS = 8; public static readonly int TRANSMITTANCE_WIDTH = 256; public static readonly int TRANSMITTANCE_HEIGHT = 64; public static readonly int TRANSMITTANCE_CHANNELS = 3; public static readonly int TRANSMITTANCE_SIZE = TRANSMITTANCE_WIDTH * TRANSMITTANCE_HEIGHT; public static readonly int SCATTERING_R = 32; public static readonly int SCATTERING_MU = 128; public static readonly int SCATTERING_MU_S = 32; public static readonly int SCATTERING_NU = 8; public static readonly int SCATTERING_WIDTH = SCATTERING_NU * SCATTERING_MU_S; public static readonly int SCATTERING_HEIGHT = SCATTERING_MU; public static readonly int SCATTERING_DEPTH = SCATTERING_R; public static readonly int SCATTERING_CHANNELS = 4; public static readonly int SCATTERING_SIZE = SCATTERING_WIDTH * SCATTERING_HEIGHT * SCATTERING_DEPTH; public static readonly int IRRADIANCE_WIDTH = 64; public static readonly int IRRADIANCE_HEIGHT = 16; public static readonly int IRRADIANCE_CHANNELS = 3; public static readonly int IRRADIANCE_SIZE = IRRADIANCE_WIDTH * IRRADIANCE_HEIGHT; // The conversion factor between watts and lumens. public static readonly double MAX_LUMINOUS_EFFICACY = 683.0; // Values from "CIE (1931) 2-deg color matching functions", see // "http://web.archive.org/web/20081228084047/ // http://www.cvrl.org/database/data/cmfs/ciexyz31.txt". public static readonly double[] CIE_2_DEG_COLOR_MATCHING_FUNCTIONS = new double[] { 360, 0.000129900000, 0.000003917000, 0.000606100000, 365, 0.000232100000, 0.000006965000, 0.001086000000, 370, 0.000414900000, 0.000012390000, 0.001946000000, 375, 0.000741600000, 0.000022020000, 0.003486000000, 380, 0.001368000000, 0.000039000000, 0.006450001000, 385, 0.002236000000, 0.000064000000, 0.010549990000, 390, 0.004243000000, 0.000120000000, 0.020050010000, 395, 0.007650000000, 0.000217000000, 0.036210000000, 400, 0.014310000000, 0.000396000000, 0.067850010000, 405, 0.023190000000, 0.000640000000, 0.110200000000, 410, 0.043510000000, 0.001210000000, 0.207400000000, 415, 0.077630000000, 0.002180000000, 0.371300000000, 420, 0.134380000000, 0.004000000000, 0.645600000000, 425, 0.214770000000, 0.007300000000, 1.039050100000, 430, 0.283900000000, 0.011600000000, 1.385600000000, 435, 0.328500000000, 0.016840000000, 1.622960000000, 440, 0.348280000000, 0.023000000000, 1.747060000000, 445, 0.348060000000, 0.029800000000, 1.782600000000, 450, 0.336200000000, 0.038000000000, 1.772110000000, 455, 0.318700000000, 0.048000000000, 1.744100000000, 460, 0.290800000000, 0.060000000000, 1.669200000000, 465, 0.251100000000, 0.073900000000, 1.528100000000, 470, 0.195360000000, 0.090980000000, 1.287640000000, 475, 0.142100000000, 0.112600000000, 1.041900000000, 480, 0.095640000000, 0.139020000000, 0.812950100000, 485, 0.057950010000, 0.169300000000, 0.616200000000, 490, 0.032010000000, 0.208020000000, 0.465180000000, 495, 0.014700000000, 0.258600000000, 0.353300000000, 500, 0.004900000000, 0.323000000000, 0.272000000000, 505, 0.002400000000, 0.407300000000, 0.212300000000, 510, 0.009300000000, 0.503000000000, 0.158200000000, 515, 0.029100000000, 0.608200000000, 0.111700000000, 520, 0.063270000000, 0.710000000000, 0.078249990000, 525, 0.109600000000, 0.793200000000, 0.057250010000, 530, 0.165500000000, 0.862000000000, 0.042160000000, 535, 0.225749900000, 0.914850100000, 0.029840000000, 540, 0.290400000000, 0.954000000000, 0.020300000000, 545, 0.359700000000, 0.980300000000, 0.013400000000, 550, 0.433449900000, 0.994950100000, 0.008749999000, 555, 0.512050100000, 1.000000000000, 0.005749999000, 560, 0.594500000000, 0.995000000000, 0.003900000000, 565, 0.678400000000, 0.978600000000, 0.002749999000, 570, 0.762100000000, 0.952000000000, 0.002100000000, 575, 0.842500000000, 0.915400000000, 0.001800000000, 580, 0.916300000000, 0.870000000000, 0.001650001000, 585, 0.978600000000, 0.816300000000, 0.001400000000, 590, 1.026300000000, 0.757000000000, 0.001100000000, 595, 1.056700000000, 0.694900000000, 0.001000000000, 600, 1.062200000000, 0.631000000000, 0.000800000000, 605, 1.045600000000, 0.566800000000, 0.000600000000, 610, 1.002600000000, 0.503000000000, 0.000340000000, 615, 0.938400000000, 0.441200000000, 0.000240000000, 620, 0.854449900000, 0.381000000000, 0.000190000000, 625, 0.751400000000, 0.321000000000, 0.000100000000, 630, 0.642400000000, 0.265000000000, 0.000049999990, 635, 0.541900000000, 0.217000000000, 0.000030000000, 640, 0.447900000000, 0.175000000000, 0.000020000000, 645, 0.360800000000, 0.138200000000, 0.000010000000, 650, 0.283500000000, 0.107000000000, 0.000000000000, 655, 0.218700000000, 0.081600000000, 0.000000000000, 660, 0.164900000000, 0.061000000000, 0.000000000000, 665, 0.121200000000, 0.044580000000, 0.000000000000, 670, 0.087400000000, 0.032000000000, 0.000000000000, 675, 0.063600000000, 0.023200000000, 0.000000000000, 680, 0.046770000000, 0.017000000000, 0.000000000000, 685, 0.032900000000, 0.011920000000, 0.000000000000, 690, 0.022700000000, 0.008210000000, 0.000000000000, 695, 0.015840000000, 0.005723000000, 0.000000000000, 700, 0.011359160000, 0.004102000000, 0.000000000000, 705, 0.008110916000, 0.002929000000, 0.000000000000, 710, 0.005790346000, 0.002091000000, 0.000000000000, 715, 0.004109457000, 0.001484000000, 0.000000000000, 720, 0.002899327000, 0.001047000000, 0.000000000000, 725, 0.002049190000, 0.000740000000, 0.000000000000, 730, 0.001439971000, 0.000520000000, 0.000000000000, 735, 0.000999949300, 0.000361100000, 0.000000000000, 740, 0.000690078600, 0.000249200000, 0.000000000000, 745, 0.000476021300, 0.000171900000, 0.000000000000, 750, 0.000332301100, 0.000120000000, 0.000000000000, 755, 0.000234826100, 0.000084800000, 0.000000000000, 760, 0.000166150500, 0.000060000000, 0.000000000000, 765, 0.000117413000, 0.000042400000, 0.000000000000, 770, 0.000083075270, 0.000030000000, 0.000000000000, 775, 0.000058706520, 0.000021200000, 0.000000000000, 780, 0.000041509940, 0.000014990000, 0.000000000000, 785, 0.000029353260, 0.000010600000, 0.000000000000, 790, 0.000020673830, 0.000007465700, 0.000000000000, 795, 0.000014559770, 0.000005257800, 0.000000000000, 800, 0.000010253980, 0.000003702900, 0.000000000000, 805, 0.000007221456, 0.000002607800, 0.000000000000, 810, 0.000005085868, 0.000001836600, 0.000000000000, 815, 0.000003581652, 0.000001293400, 0.000000000000, 820, 0.000002522525, 0.000000910930, 0.000000000000, 825, 0.000001776509, 0.000000641530, 0.000000000000, 830, 0.000001251141, 0.000000451810, 0.000000000000, }; // The conversion matrix from XYZ to linear sRGB color spaces. // Values from https://en.wikipedia.org/wiki/SRGB. public static readonly double[] XYZ_TO_SRGB = new double[] { +3.2406, -1.5372, -0.4986, -0.9689, +1.8758, +0.0415, +0.0557, -0.2040, +1.0570 }; } }