1 line
9.3 KiB
Plaintext
1 line
9.3 KiB
Plaintext
|
{"version":3,"file":"Sky.cjs","sources":["../../src/objects/Sky.js"],"sourcesContent":["import { BackSide, BoxGeometry, Mesh, ShaderMaterial, UniformsUtils, Vector3 } from 'three'\nimport { version } from '../_polyfill/constants'\n\n/**\n * Based on \"A Practical Analytic Model for Daylight\"\n * aka The Preetham Model, the de facto standard analytic skydome model\n * https://www.researchgate.net/publication/220720443_A_Practical_Analytic_Model_for_Daylight\n *\n * First implemented by Simon Wallner\n * http://www.simonwallner.at/projects/atmospheric-scattering\n *\n * Improved by Martin Upitis\n * http://blenderartists.org/forum/showthread.php?245954-preethams-sky-impementation-HDR\n *\n * Three.js integration by zz85 http://twitter.com/blurspline\n */\nconst Sky = /* @__PURE__ */ (() => {\n const SkyShader = {\n uniforms: {\n turbidity: { value: 2 },\n rayleigh: { value: 1 },\n mieCoefficient: { value: 0.005 },\n mieDirectionalG: { value: 0.8 },\n sunPosition: { value: new Vector3() },\n up: { value: new Vector3(0, 1, 0) },\n },\n\n vertexShader: /* glsl */ `\n uniform vec3 sunPosition;\n uniform float rayleigh;\n uniform float turbidity;\n uniform float mieCoefficient;\n uniform vec3 up;\n\n varying vec3 vWorldPosition;\n varying vec3 vSunDirection;\n varying float vSunfade;\n varying vec3 vBetaR;\n varying vec3 vBetaM;\n varying float vSunE;\n\n // constants for atmospheric scattering\n const float e = 2.71828182845904523536028747135266249775724709369995957;\n const float pi = 3.141592653589793238462643383279502884197169;\n\n // wavelength of used primaries, according to preetham\n const vec3 lambda = vec3( 680E-9, 550E-9, 450E-9 );\n // this pre-calcuation replaces older TotalRayleigh(vec3 lambda) function:\n // (8.0 * pow(pi, 3.0) * pow(pow(n, 2.0) - 1.0, 2.0) * (6.0 + 3.0 * pn)) / (3.0 * N * pow(lambda, vec3(4.0)) * (6.0 - 7.0 * pn))\n const vec3 totalRayleigh = vec3( 5.804542996261093E-6, 1.3562911419845635E-5, 3.0265902468824876E-5 );\n\n // mie stuff\n // K coefficient for the primaries\n const float v = 4.0;\n const vec3 K = vec3( 0.686, 0.678, 0.666 );\n // MieConst = pi * pow( ( 2.0 * pi ) / lambda, vec3( v - 2.0 ) ) * K\n const vec3 MieConst = vec3( 1.8399918514433978E14, 2.7798023919660528E14, 4.0790479543861094E14 );\n\n // earth shadow hack\n // cutoffAngle = pi / 1.95;\n const float cutoffAngle = 1.6110731556870734;\n const float steepness = 1.5;\n const float EE = 1000.0;\n\n float sunIntensity( float zenithAngleCos ) {\n zenithAngleCos = clamp( zenithAngleCos, -1.0, 1.0 );\n return EE * max( 0.0, 1.0 - pow( e, -( ( cutoffAngle - acos( zenithAngleCos ) ) / steepness ) ) );\n }\n\n vec3 totalMie( float T ) {\n float c = ( 0.2 * T ) * 10E-18;\n return 0.434 * c * MieConst;\n }\n\n void main() {\n\n vec4 worldPosition = modelMatrix * vec4( position, 1.0 );\n vWorldPosition = worldPosition.xyz;\n\n gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );\n gl_Position.z = gl_Position.w; // set z to camera.far\n\n vSunDirection = normalize( sunPosition );\n\n vSunE = sunIntensity( dot( vSunDirection, up ) );\n\n vSunfade = 1.0 - clamp( 1.0 - exp( ( sunPosition.y / 450000.0 ) ), 0.0, 1.0 );\n\n float rayleighCoefficient = rayleigh - ( 1.0 * ( 1.0 - vSunfade ) );\n\n // extinction (absorbtion + out scattering)\n // rayleigh coefficients\n vBetaR = totalRayleigh * rayleighCoefficient;\n\n // mie coefficients\n vBetaM = totalMie( turbidity ) * mieCoefficient;\n\n }\n `,\n\n fragmentShader: /* glsl */ `\n varying vec3 vWorldPosition;\n varying vec3 vSunDirection;\n varying float vSunfade;\n varying vec3 vBetaR;\n varying vec3 vBetaM;\n varying float vSunE;\n\n uniform float mieDirectionalG;\n uniform vec3 up;\n\n cons
|