效果圖

功能說明

場景設置主要基于PostProcessStage方法進行設置，在Cesium中創建一個蒙版式的后期處理，
主要處理是根據Shader進行渲染，有點類似于Canvas的濾鏡效果一般，對全屏進行處理。
所以場景設置實際為后期處理，全球雨雪霧天氣，PostProcessStage方法無法做到局部。

需要局部下雨下雪可以參照官網的示例

核心代碼

以下的代碼，首先創建PostProcessStage對象。通過在PostProcessStage類中uniforms屬性修改雨的傾斜度、大小和速度，就可以創建出所需要的PostProcessStage對象~雨天氣
雨天氣的場景設置

var tiltAngle = Cesium.defaultValue(options.tiltAngle, -0.6); var rainSize = Cesium.defaultValue(options.rainSize, 0.3); var rainSpeed = Cesium.defaultValue(options.rainSpeed, 60.0); var rainStage = new Cesium.PostProcessStage({name: 'czm_rain',fragmentShader: "uniform sampler2D colorTexture;\n\varying vec2 v_textureCoordinates;\n\uniform float tiltAngle;\n\uniform float rainSize;\n\uniform float rainSpeed;\n\float hash(float x) {\n\return fract(sin(x * 133.3) * 13.13);\n\}\n\void main(void) {\n\float time = czm_frameNumber / rainSpeed;\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 = tiltAngle;\n\float si = sin(a), co = cos(a);\n\uv *= mat2(co, -si, si, co);\n\uv *= length(uv + vec2(0, 4.9)) * rainSize + 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), .5);\n\}\n\";,uniforms: {tiltAngle: () => {return tiltAngle;},rainSize: () => {return rainSize;},rainSpeed: () => {return rainSpeed;}}}); viewer.scene.postProcessStages.add(rainStage);

霧天氣的場景設置

var fogthicknessnum = 1.0;//可見度 var nowfragmentShader =`uniform sampler2D colorTexture;uniform sampler2D depthTexture;varying vec2 v_textureCoordinates;uniform float fognum;void main(void){vec4 origcolor=texture2D(colorTexture, v_textureCoordinates);vec4 fogcolor=vec4(0.8,0.8,0.8,0.5);float depth = czm_readDepth(depthTexture, v_textureCoordinates);vec4 depthcolor=texture2D(depthTexture, v_textureCoordinates);float f=(depthcolor.r-0.22)/fognum;if(f<0.0) f=0.0;else if(f>1.0) f=1.0;gl_FragColor = mix(origcolor,fogcolor,f);}`; var ProcessScenes = new Cesium.PostProcessStage({fragmentShader: nowfragmentShader,uniforms: {scale: 1.1,offset: function() {return new Cesium.Cartesian3(0.1, 0.2, 0.3);},fognum: () => {return fogthicknessnum;},}, }) viewer.scene.postProcessStages.add(ProcessScenes);

雪天氣的場景設置

var snowSize = Cesium.defaultValue(snowopt.size, 0.02); var snowSpeed = Cesium.defaultValue(snowopt.speed, 60.0); var fragmentShader =`uniform sampler2D colorTexture;varying vec2 v_textureCoordinates;uniform float snowSpeed;uniform float snowSize;float snow(vec2 uv,float scale){float time=czm_frameNumber/snowSpeed;float w=smoothstep(1.,0.,-uv.y*(scale/10.));if(w<.1)return 0.;uv+=time/scale;uv.y+=time*2./scale;uv.x+=sin(uv.y+time*.5)/scale;uv*=scale;vec2 s=floor(uv),f=fract(uv),p;float k=3.,d;p=.5+.35*sin(11.*fract(sin((s+p+scale)*mat2(7,3,6,5))*5.))-f;d=length(p);k=min(d,k);k=smoothstep(0.,k,sin(f.x+f.y)*snowSize);return k*w;}void main(void){vec2 resolution=czm_viewport.zw;vec2 uv=(gl_FragCoord.xy*2.-resolution.xy)/min(resolution.x,resolution.y);vec3 finalColor=vec3(0);float c=0.;c+=snow(uv,30.)*.0;c+=snow(uv,20.)*.0;c+=snow(uv,15.)*.0;c+=snow(uv,10.);c+=snow(uv,8.);c+=snow(uv,6.);c+=snow(uv,5.);finalColor=(vec3(c));gl_FragColor=mix(texture2D(colorTexture,v_textureCoordinates),vec4(finalColor,1),.5);}`; var ProcessScenes = new Cesium.PostProcessStage({fragmentShader: fragmentShader,uniforms: {snowSize: () => {return snowSize;},snowSpeed: () => {return snowSpeed;},}, }) viewer.scene.postProcessStages.add(ProcessScenes);

不足之處

該場景設置只能運用到全球，不能實現局部下雨

腳本下載

沒有壓縮，可以HTML文件，里面有黑白場景、夜視場景和描邊場景。
https://download.csdn.net/download/qq_35984445/86031544
包含有添加天際線場景設置腳本
https://download.csdn.net/download/qq_35984445/86744804

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