68 lines
1.8 KiB
TypeScript
68 lines
1.8 KiB
TypeScript
import {
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BackSide,
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DirectionalLight,
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Mesh,
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Object3D,
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ShaderMaterial,
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SphereGeometry,
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} from 'three';
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import { plainText as vertexShader } from './shaders/atmosphere.vert';
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import { plainText as fragmentShader } from './shaders/atmosphere.frag';
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export class Atmosphere extends Object3D {
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public Rayleigh = 0.0025;
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public Mie = 0.0005;
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public Exposure = 15.0;
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public Scale = 1;
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public ScaleDepth = 0.25;
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public G = -0.95;
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public Wavelength = [0.65, 0.57, 0.475];
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public geom?: SphereGeometry;
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public mesh?: Mesh;
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public shader = new ShaderMaterial({
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vertexShader,
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fragmentShader,
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side: BackSide,
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transparent: true,
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});
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constructor(public innerRadius: number, public outerRadius: number) {
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super();
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this.Scale = 1 / (this.outerRadius - this.innerRadius);
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this.setUniforms(this.shader);
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this.initialize();
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}
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setUniforms(shader: ShaderMaterial) {
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shader.uniforms.invWavelength = {
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value: [
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1 / Math.pow(this.Wavelength[0], 4),
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1 / Math.pow(this.Wavelength[1], 4),
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1 / Math.pow(this.Wavelength[2], 4),
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],
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};
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shader.uniforms.outerRadius = { value: this.outerRadius };
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shader.uniforms.innerRadius = { value: this.innerRadius };
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shader.uniforms.Kr = { value: this.Rayleigh };
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shader.uniforms.Km = { value: this.Mie };
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shader.uniforms.ESun = { value: this.Exposure };
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shader.uniforms.scale = { value: this.Scale };
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shader.uniforms.scaleDepth = { value: this.ScaleDepth };
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shader.uniforms.g = { value: this.G };
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}
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setLight(light: DirectionalLight) {
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this.shader.uniforms.lightDirection = {
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value: light.position.clone().normalize(),
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};
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}
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initialize() {
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this.geom = new SphereGeometry(this.outerRadius, 128, 128);
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this.mesh = new Mesh(this.geom, this.shader);
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this.add(this.mesh);
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}
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}
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