Cesium 模拟下雨

•  代码:

//定义下雨场景 着色器
function FragmentShader_Rain() {return "uniform sampler2D colorTexture;\n\varying vec2 v_textureCoordinates;\n\\n\float hash(float x){\n\return fract(sin(x*133.3)*13.13);\n\}\n\\n\void main(void){\n\\n\float time = czm_frameNumber / 200.0;\n\vec2 resolution = czm_viewport.zw;\n\\n\vec2 uv=(gl_FragCoord.xy*2.-resolution.xy)/min(resolution.x,resolution.y);\n\vec3 c=vec3(.6,.7,.8);\n\\n\float a=-.4;\n\float si=sin(a),co=cos(a);\n\uv*=mat2(co,-si,si,co);\n\uv*=length(uv+vec2(0,4.9))*.3+1.;\n\\n\float v=1.-sin(hash(floor(uv.x*100.))*2.);\n\float b=clamp(abs(sin(20.*time*v+uv.y*(5./(2.+v))))-.95,0.,1.)*20.;\n\c*=v*b; \n\\n\gl_FragColor = mix(texture2D(colorTexture, v_textureCoordinates), vec4(c,1), 0.5);  \n\}\n\";
}// 特效管理
export default class RainEffectManager {constructor(viewer) {this._viewer = viewer;}AddRainEffect() {if (this._rainEffect) {return;}let collection = this._viewer.scene.postProcessStages;let fs_rain = FragmentShader_Rain();this._rainEffect = new Cesium.PostProcessStage({name: "czm_rain",fragmentShader: fs_rain,});collection.add(this._rainEffect);}RemoveRainEffect() {if (this._rainEffect) {this._viewer.scene.postProcessStages.remove(this._rainEffect);this._rainEffect = null;}}
}

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