65 lines
2.1 KiB
JavaScript
65 lines
2.1 KiB
JavaScript
/*
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* @Descripttion:
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* @version: 1.0
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* @Author: zhangti
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* @Date: 2019-10-15 18:02:44
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* @LastEditors: sueRimn
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* @LastEditTime: 2019-11-12 10:38:13
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*/
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/**
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*
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* 封装天气场景
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* 雪天
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*/
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export default class Snow{
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constructor(v){
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this.collection = v.scene.postProcessStages;
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this._snow = new Cesium.PostProcessStage({
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name: 'czm_snow',
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fragmentShader: this.getFS()
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});
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this.collection.add(this._snow);
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v.scene.skyAtmosphere.hueShift = -0.8;
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v.scene.skyAtmosphere.saturationShift = -0.7;
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v.scene.skyAtmosphere.brightnessShift = -0.33;
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v.scene.fog.density = 0.001;
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v.scene.fog.minimumBrightness = 0.8;
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}
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getFS(){
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return "uniform sampler2D colorTexture;\n\
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varying vec2 v_textureCoordinates;\n\
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\n\
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float snow(vec2 uv,float scale)\n\
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{\n\
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float time = czm_frameNumber / 60.0;\n\
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float w=smoothstep(1.,0.,-uv.y*(scale/10.));if(w<.1)return 0.;\n\
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uv+=time/scale;uv.y+=time*2./scale;uv.x+=sin(uv.y+time*.5)/scale;\n\
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uv*=scale;vec2 s=floor(uv),f=fract(uv),p;float k=3.,d;\n\
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p=.5+.35*sin(11.*fract(sin((s+p+scale)*mat2(7,3,6,5))*5.))-f;d=length(p);k=min(d,k);\n\
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k=smoothstep(0.,k,sin(f.x+f.y)*0.01);\n\
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return k*w;\n\
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}\n\
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\n\
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void main(void){\n\
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vec2 resolution = czm_viewport.zw;\n\
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vec2 uv=(gl_FragCoord.xy*2.-resolution.xy)/min(resolution.x,resolution.y);\n\
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vec3 finalColor=vec3(0);\n\
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float c = 0.0;\n\
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c+=snow(uv,30.)*.0;\n\
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c+=snow(uv,20.)*.0;\n\
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c+=snow(uv,15.)*.0;\n\
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c+=snow(uv,10.);\n\
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c+=snow(uv,8.);\n\
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c+=snow(uv,6.);\n\
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c+=snow(uv,5.);\n\
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finalColor=(vec3(c)); \n\
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gl_FragColor = mix(texture2D(colorTexture, v_textureCoordinates), vec4(finalColor,1), 0.5); \n\
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\n\
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}\n\
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";
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}
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remove(){
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this._snow.destroy();
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}
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} |