vue+cesium 天气场景——下雨、下雪

效果：

雨天场景模拟：

 雪天场景模拟：

js部分：

/*** 基础模块* @param {*} viewer*/export function Base3D(viewer) {this._viewer = viewer}/*** 雨天特效* @param {*} viewer*/Base3D.prototype.setRainEffect = function () {if (this._viewer) {var fs = "uniform sampler2D colorTexture;\n\varying vec2 v_textureCoordinates;\n\\n\float hash(float x){\n\return fract(sin(x*23.3)*13.13);\n\}\n\\n\void main(){\n\float time = czm_frameNumber / 60.0;\n\vec2 resolution = czm_viewport.zw;\n\vec2 uv=(gl_FragCoord.xy*2.-resolution.xy)/min(resolution.x,resolution.y);\n\vec3 c=vec3(.6,.7,.8);\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\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\gl_FragColor = mix(texture2D(colorTexture, v_textureCoordinates), vec4(c, 1), 0.2);\n\}\n\";return this._viewer.scene.postProcessStages.add(new Cesium.PostProcessStage({name: 'rainEffect',fragmentShader: fs}));}},/*** 雪天特效* @param {*} viewer*/Base3D.prototype.setSnowEffect = function () {if (this._viewer) {var fs = "uniform sampler2D colorTexture;\n\varying vec2 v_textureCoordinates;\n\\n\float snow(vec2 uv,float scale){\n\float time = czm_frameNumber / 60.0;\n\float w=smoothstep(1.,0.,-uv.y*(scale/10.));\n\if(w<.1)return 0.;\n\uv+=time/scale;\n\uv.y+=time*2./scale;\n\uv.x+=sin(uv.y+time*.5)/scale;\n\uv*=scale;\n\vec2 s=floor(uv),f=fract(uv),p;\n\float k=3.,d;\n\p=.5+.35*sin(11.*fract(sin((s+p+scale)*mat2(7,3,6,5))*5.))-f;\n\d=length(p);\n\k=min(d,k);\n\k=smoothstep(0.,k,sin(f.x+f.y)*0.01);\n\return k*w;\n\}\n\\n\void main(){\n\vec2 resolution = czm_viewport.zw;\n\vec2 uv=(gl_FragCoord.xy*2.-resolution.xy)/min(resolution.x,resolution.y);\n\vec3 finalColor=vec3(0);\n\float c = 0.0;\n\c+=snow(uv,30.)*.0;\n\c+=snow(uv,20.)*.0;\n\c+=snow(uv,15.)*.0;\n\c+=snow(uv,10.);\n\c+=snow(uv,8.);\n\c+=snow(uv,6.);\n\c+=snow(uv,5.);\n\finalColor=(vec3(c));\n\gl_FragColor = mix(texture2D(colorTexture, v_textureCoordinates), vec4(finalColor,1), 0.3);\n\\n\}\n\";return this._viewer.scene.postProcessStages.add(new Cesium.PostProcessStage({name: 'snowEffect',fragmentShader: fs}));}}/*** 初始化* @param {*} initRain* @param {*} initSnow*/
Base3D.prototype.initRain = function () {this.setRainEffect();
}
Base3D.prototype.initSnow = function () {this.setSnowEffect();
}

vue调用：

//添加下雨特效this.setRainEffect=new Base3D(this.viewer);this.setRainEffect.initRain();