mirror of https://gitee.com/cf-fz/WebCAD.git
ChenX
7 years ago
parent
a216845d1b
commit
8c4872847c
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import * as THREE from 'three';
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import { app } from '../ApplicationServices/Application';
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import { Command } from '../Editor/CommandMachine';
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import { Sky } from './Sky';
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export class DrawSky implements Command
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{
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async exec()
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{
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let sky = new Sky();
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app.m_Viewer.m_Scene.add(sky);
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sky.scale.setScalar(50);
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sky.rotateY(Math.PI);
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let mat = sky.material as THREE.ShaderMaterial;
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mat.uniforms.sub
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window["sky"] = sky;
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}
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async exec2()
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{
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let vertexShader = require("../glsl/sky.vs");
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let fragmentShader = require("../glsl/sky.fs");
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var uniforms = {
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topColor: { value: new THREE.Color(0x0077ff) },
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bottomColor: { value: new THREE.Color(0xffffff) },
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offset: { value: 33 },
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exponent: { value: 0.6 }
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};
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uniforms.topColor.value.copy(new THREE.Color(0.6, 1, 0.6));
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var skyGeo = new THREE.SphereGeometry(40, 32, 15);
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var skyMat = new THREE.ShaderMaterial({ vertexShader: vertexShader, fragmentShader: fragmentShader, uniforms: uniforms, side: THREE.BackSide });
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var sky = new THREE.Mesh(skyGeo, skyMat);
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app.m_Viewer.m_Scene.add(sky);
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}
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}
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import * as THREE from "three";
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/**
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* @author zz85 / https://github.com/zz85
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*
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* Based on "A Practical Analytic Model for Daylight"
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* aka The Preetham Model, the de facto standard analytic skydome model
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* http://www.cs.utah.edu/~shirley/papers/sunsky/sunsky.pdf
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*
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* First implemented by Simon Wallner
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* http://www.simonwallner.at/projects/atmospheric-scattering
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*
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* Improved by Martin Upitis
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* http://blenderartists.org/forum/showthread.php?245954-preethams-sky-impementation-HDR
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*
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* Three.js integration by zz85 http://twitter.com/blurspline
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*/
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export class Sky extends THREE.Mesh
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{
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constructor()
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{
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super();
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this.geometry = new THREE.SphereBufferGeometry(1, 32, 15);
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this.material = new THREE.ShaderMaterial({
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fragmentShader: SkyShader.fragmentShader,
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vertexShader: SkyShader.vertexShader,
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uniforms: THREE.UniformsUtils.clone(SkyShader.uniforms),
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side: THREE.BackSide
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})
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this.material.needsUpdate = true;
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}
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get Uniforms()
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{
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let mat = this.material as THREE.ShaderMaterial;
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return mat.uniforms as SkyUniforms;
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}
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}
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const SkyShader =
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{
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uniforms: {
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luminance: { value: 1 },
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turbidity: { value: 2 },
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rayleigh: { value: 1 },
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mieCoefficient: { value: 0.005 },
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mieDirectionalG: { value: 0.8 },
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sunPosition: { value: new THREE.Vector3(0, 50, 20) }
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},
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vertexShader: [
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'uniform vec3 sunPosition;',
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'uniform float rayleigh;',
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'uniform float turbidity;',
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'uniform float mieCoefficient;',
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'varying vec3 vWorldPosition;',
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'varying vec3 vSunDirection;',
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'varying float vSunfade;',
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'varying vec3 vBetaR;',
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'varying vec3 vBetaM;',
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'varying float vSunE;',
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'const vec3 up = vec3( 0.0, 0.0, 1.0 );',
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// constants for atmospheric scattering
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'const float e = 2.71828182845904523536028747135266249775724709369995957;',
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'const float pi = 3.141592653589793238462643383279502884197169;',
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// wavelength of used primaries, according to preetham
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'const vec3 lambda = vec3( 680E-9, 550E-9, 450E-9 );',
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// this pre-calcuation replaces older TotalRayleigh(vec3 lambda) function:
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// (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))
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'const vec3 totalRayleigh = vec3( 5.804542996261093E-6, 1.3562911419845635E-5, 3.0265902468824876E-5 );',
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// mie stuff
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// K coefficient for the primaries
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'const float v = 4.0;',
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'const vec3 K = vec3( 0.686, 0.678, 0.666 );',
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// MieConst = pi * pow( ( 2.0 * pi ) / lambda, vec3( v - 2.0 ) ) * K
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'const vec3 MieConst = vec3( 1.8399918514433978E14, 2.7798023919660528E14, 4.0790479543861094E14 );',
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// earth shadow hack
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// cutoffAngle = pi / 1.95;
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'const float cutoffAngle = 1.6110731556870734;',
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'const float steepness = 1.5;',
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'const float EE = 1000.0;',
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'float sunIntensity( float zenithAngleCos ) {',
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' zenithAngleCos = clamp( zenithAngleCos, -1.0, 1.0 );',
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' return EE * max( 0.0, 1.0 - pow( e, -( ( cutoffAngle - acos( zenithAngleCos ) ) / steepness ) ) );',
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'}',
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'vec3 totalMie( float T ) {',
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' float c = ( 0.2 * T ) * 10E-18;',
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' return 0.434 * c * MieConst;',
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'}',
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'void main() {',
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' vec4 worldPosition = modelMatrix * vec4( position, 1.0 );',
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' vWorldPosition = worldPosition.xyz;',
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' gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
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' vSunDirection = normalize( sunPosition );',
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' vSunE = sunIntensity( dot( vSunDirection, up ) );',
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' vSunfade = 1.0 - clamp( 1.0 - exp( ( sunPosition.y / 450000.0 ) ), 0.0, 1.0 );',
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' float rayleighCoefficient = rayleigh - ( 1.0 * ( 1.0 - vSunfade ) );',
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// extinction (absorbtion + out scattering)
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// rayleigh coefficients
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' vBetaR = totalRayleigh * rayleighCoefficient;',
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// mie coefficients
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' vBetaM = totalMie( turbidity ) * mieCoefficient;',
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'}'
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].join('\n'),
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fragmentShader: [
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'varying vec3 vWorldPosition;',
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'varying vec3 vSunDirection;',
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'varying float vSunfade;',
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'varying vec3 vBetaR;',
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'varying vec3 vBetaM;',
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'varying float vSunE;',
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'uniform float luminance;',
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'uniform float mieDirectionalG;',
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'const vec3 cameraPos = vec3( 0.0, 0.0, 0.0 );',
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// constants for atmospheric scattering
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'const float pi = 3.141592653589793238462643383279502884197169;',
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'const float n = 1.0003;', // refractive index of air
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'const float N = 2.545E25;', // number of molecules per unit volume for air at
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// 288.15K and 1013mb (sea level -45 celsius)
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// optical length at zenith for molecules
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'const float rayleighZenithLength = 8.4E3;',
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'const float mieZenithLength = 1.25E3;',
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'const vec3 up = vec3( 0.0, 0.0, 1.0 );',
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// 66 arc seconds -> degrees, and the cosine of that
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'const float sunAngularDiameterCos = 0.999956676946448443553574619906976478926848692873900859324;',
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// 3.0 / ( 16.0 * pi )
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'const float THREE_OVER_SIXTEENPI = 0.05968310365946075;',
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// 1.0 / ( 4.0 * pi )
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'const float ONE_OVER_FOURPI = 0.07957747154594767;',
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'float rayleighPhase( float cosTheta ) {',
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' return THREE_OVER_SIXTEENPI * ( 1.0 + pow( cosTheta, 2.0 ) );',
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'}',
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'float hgPhase( float cosTheta, float g ) {',
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' float g2 = pow( g, 2.0 );',
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' float inverse = 1.0 / pow( 1.0 - 2.0 * g * cosTheta + g2, 1.5 );',
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' return ONE_OVER_FOURPI * ( ( 1.0 - g2 ) * inverse );',
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'}',
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// Filmic ToneMapping http://filmicgames.com/archives/75
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'const float A = 0.15;',
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'const float B = 0.50;',
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'const float C = 0.10;',
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'const float D = 0.20;',
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'const float E = 0.02;',
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'const float F = 0.30;',
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'const float whiteScale = 1.0748724675633854;', // 1.0 / Uncharted2Tonemap(1000.0)
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'vec3 Uncharted2Tonemap( vec3 x ) {',
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' return ( ( x * ( A * x + C * B ) + D * E ) / ( x * ( A * x + B ) + D * F ) ) - E / F;',
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'}',
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'void main() {',
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// optical length
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// cutoff angle at 90 to avoid singularity in next formula.
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' float zenithAngle = acos( max( 0.0, dot( up, normalize( vWorldPosition - cameraPos ) ) ) );',
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' float inverse = 1.0 / ( cos( zenithAngle ) + 0.15 * pow( 93.885 - ( ( zenithAngle * 180.0 ) / pi ), -1.253 ) );',
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' float sR = rayleighZenithLength * inverse;',
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' float sM = mieZenithLength * inverse;',
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// combined extinction factor
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' vec3 Fex = exp( -( vBetaR * sR + vBetaM * sM ) );',
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// in scattering
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' float cosTheta = dot( normalize( vWorldPosition - cameraPos ), vSunDirection );',
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' float rPhase = rayleighPhase( cosTheta * 0.5 + 0.5 );',
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' vec3 betaRTheta = vBetaR * rPhase;',
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' float mPhase = hgPhase( cosTheta, mieDirectionalG );',
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' vec3 betaMTheta = vBetaM * mPhase;',
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' vec3 Lin = pow( vSunE * ( ( betaRTheta + betaMTheta ) / ( vBetaR + vBetaM ) ) * ( 1.0 - Fex ), vec3( 1.5 ) );',
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' Lin *= mix( vec3( 1.0 ), pow( vSunE * ( ( betaRTheta + betaMTheta ) / ( vBetaR + vBetaM ) ) * Fex, vec3( 1.0 / 2.0 ) ), clamp( pow( 1.0 - dot( up, vSunDirection ), 5.0 ), 0.0, 1.0 ) );',
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// nightsky
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' vec3 direction = normalize( vWorldPosition - cameraPos );',
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' float theta = acos( direction.y ); // elevation --> y-axis, [-pi/2, pi/2]',
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' float phi = atan( direction.z, direction.x ); // azimuth --> x-axis [-pi/2, pi/2]',
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' vec2 uv = vec2( phi, theta ) / vec2( 2.0 * pi, pi ) + vec2( 0.5, 0.0 );',
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' vec3 L0 = vec3( 0.1 ) * Fex;',
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// composition + solar disc
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' float sundisk = smoothstep( sunAngularDiameterCos, sunAngularDiameterCos + 0.00002, cosTheta );',
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' L0 += ( vSunE * 19000.0 * Fex ) * sundisk;',
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' vec3 texColor = ( Lin + L0 ) * 0.04 + vec3( 0.0, 0.0003, 0.00075 );',
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' vec3 curr = Uncharted2Tonemap( ( log2( 2.0 / pow( luminance, 4.0 ) ) ) * texColor );',
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' vec3 color = curr * whiteScale;',
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' vec3 retColor = pow( color, vec3( 1.0 / ( 1.2 + ( 1.2 * vSunfade ) ) ) );',
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' gl_FragColor = vec4( retColor, 1.0 );',
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'}'
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].join('\n')
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};
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type SkyUniforms = {
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luminance: { value: 1 },
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turbidity: { value: 2 },
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rayleigh: { value: 1 },
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mieCoefficient: { value: 0.005 },
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mieDirectionalG: { value: 0.8 },
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sunPosition: { value: THREE.Vector3 }
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}
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