2025-03-11 08:25:45 +00:00
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<!--********************************************************************
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* by jiawanlong
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*********************************************************************-->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8" />
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2025-03-19 03:00:22 +00:00
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<link rel="stylesheet" href="./../../libs/cesium/Cesium1.98/Widgets/widgets.css">
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<script type="text/javascript" src="./../../libs/cesium/Cesium1.98/Cesium.js"></script>
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2025-03-11 08:25:45 +00:00
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<script src="./cesium.map.min.js"></script>
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</head>
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<body style="margin: 0; overflow: hidden; background: #fff; width: 100%; height: 100%; position: absolute; top: 0">
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<div id="map" style="margin: 0 auto; width: 100%; height: 100%"></div>
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<div style="position: absolute; z-index: 1000; left: 0;top: 0;">
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<button onclick="customShader1()">纯渐变色</button>
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<button onclick="customShader2()">纯渐变色+动态光圈</button>
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<button onclick="customShader3()">清除</button>
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</div>
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<script type="text/javascript">
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Cesium.Ion.defaultAccessToken = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiI3ZjQ5ZGUzNC1jNWYwLTQ1ZTMtYmNjYS05YTY4ZTVmN2I2MDkiLCJpZCI6MTE3MTM4LCJpYXQiOjE2NzY0NDUyODB9.ZaNSBIfc1sGLhQd_xqhiSsc0yr8oS0wt1hAo9gbke6M'
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const viewer = new Cesium.Viewer('map', {});
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// 清除默认底图
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viewer.imageryLayers.remove(viewer.imageryLayers.get(0));
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// 清除默认地形
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viewer.scene.terrainProvider = new Cesium.EllipsoidTerrainProvider({});
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var options = {
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crs: "WGS84", // 使用84坐标系，默认为：GCJ02
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style: 4,
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};
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viewer.imageryLayers.add(
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new Cesium.ImageryLayer(new Cesium.TencentImageryProvider(options))
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);
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// 开启帧率
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viewer.scene.debugShowFramesPerSecond = true;
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const tileset = new Cesium.Cesium3DTileset({
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url: "./data/tileset.json",
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});
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tileset.readyPromise
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.then(function (tileset) {
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viewer.scene.primitives.add(tileset);
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viewer.zoomTo(tileset)
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})
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.catch(function (error) {
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console.log(error);
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});
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// 纯渐变色
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function customShader1() {
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let customShader = new Cesium.CustomShader({
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//片元着色器
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fragmentShaderText: `
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void fragmentMain(FragmentInput fsInput, inout czm_modelMaterial material) {
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vec3 positionMC = fsInput.attributes.positionMC;
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material.diffuse = vec3(0.0, 1.0-positionMC.y*0.005, 1.0-positionMC.y*0.0015);
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}`
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})
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tileset.customShader = customShader
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}
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// 纯渐变色+动态光圈
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function customShader2() {
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let customShader = new Cesium.CustomShader({
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//片元着色器
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fragmentShaderText: `
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void fragmentMain(FragmentInput fsInput, inout czm_modelMaterial material) {
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vec3 positionMC = fsInput.attributes.positionMC;
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material.diffuse = vec3(0.0, 1.0-positionMC.y*0.005, 1.0-positionMC.y*0.0015);
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float _baseHeight = 18.0; // 物体的基础高度，需要修改成一个合适的建筑基础高度
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float _heightRange = 60.0; // 高亮的范围(_baseHeight ~ _baseHeight + _heightRange) 默认是 0-60米
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float _glowRange = 120.0; // 光环的移动范围(高度)
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float vtxf_height = fsInput.attributes.positionMC.y - _baseHeight;
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float vtxf_a11 = fract(czm_frameNumber / 360.0) * 3.14159265 * 2.0; //此处括号内分母为移动速度
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float vtxf_a12 = vtxf_height / _heightRange + sin(vtxf_a11) * 0.1;
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material.diffuse *= vec3(vtxf_a12, vtxf_a12, vtxf_a12);
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float vtxf_a13 = fract(czm_frameNumber / 360.0); //此处括号内分母为移动速度，数值越大，速度越慢
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float vtxf_h = clamp(vtxf_height / _glowRange, 0.0, 1.0);
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vtxf_a13 = abs(vtxf_a13 - 0.5) * 2.0;
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float vtxf_diff = step(0.01, abs(vtxf_h - vtxf_a13)); // 0.1 为高亮光条的范围（粗细）
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material.diffuse += material.diffuse * (1.0 - vtxf_diff);
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}`
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})
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tileset.customShader = customShader
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}
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function customShader3() {
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let customShader = new Cesium.CustomShader({
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})
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tileset.customShader = customShader
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}
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/*
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CustomShader用法
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*/
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const customShaders = new Cesium.CustomShader({
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// 用户想要添加到着色器的任何自定义uniform。
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//Uniform是一种在着色器程序中定义的全局变量，它们可以在着色器程序的任何地方使用，但它们的值在每个渲染周期中都是不变的。
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// 这些可以在运行时通过以下方式 更改 customShader.setUniform()
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uniforms: {
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u_time: {
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value: 0, // 初始值
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type: Cesium.UniformType.FLOAT
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},
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// Textures can be loaded from a URL, a Resource, or a TypedArray.//纹理可以从 URL、资源或类型数组加载
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// 有关更多详细信息，请参阅Uniforms部分
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u_externalTexture: {
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value: new Cesium.TextureUniform({
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url: "http://example.com/image.png"
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}),
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type: Cesium.UniformType.SAMPLER_2D
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},
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// 将出现在自定义顶点和片段着色器文本中的自定义变化。
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varyings: {
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v_customTexCoords: Cesium.VaryingType.VEC2
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},
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// configure where in the fragment shader's materials/lighting pipeline the custom shader goes. More on this below.
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//配置自定义着色器在片段着色器的材质/光照管线中的位置。更多内容见下文。
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mode: Cesium.CustomShaderMode.MODIFY_MATERIAL,
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// either PBR (physically-based rendering) or UNLIT depending on the desired results.
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//PBR（基于物理的渲染）或 UNLIT，具体取决于所需的结果。
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lightingModel: Cesium.LightingModel.PBR,
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// Force the shader to render as transparent, even if the primitive had an opaque material
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//强制着色器渲染为透明，即使基元具有不透明材质
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translucencyMode: Cesium.CustomShaderTranslucencyMode.TRANSLUCENT,
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// Custom vertex shader. This is a function from model space -> model space.VertexInput is documented below
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// 自定义顶点着色器。这是模型空间 ->模型空间的函数.VertexInput输入记录如下
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vertexShaderText: `
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// IMPORTANT: the function signature must use these parameter names. This
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// makes it easier for the runtime to generate the shader and make optimizations.
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//重要说明：函数签名必须使用这些参数名称。这使运行时更容易生成着色器并进行优化。
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void vertexMain(VertexInput vsInput, inout czm_modelVertexOutput vsOutput) {
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// code goes here. An empty body is a no-op.
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//代码在这里……空的内容是无操作的。
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}
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`,
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// Custom fragment shader.
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// FragmentInput will be documented below
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// Regardless of the mode, this always takes in a material and modifies it in place.
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//自定义片元着色器
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//FragmentInput（片元）输入将被记录在下面
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//无论模式如何，这里需要一个material（材质）并将其modifies（位置）放到位
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fragmentShaderText: `
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// IMPORTANT: the function signature must use these parameter names. This
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// makes it easier for the runtime to generate the shader and make optimizations.
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// 重要提示：函数签名必须使用这些参数名称。这
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// 使运行时更容易生成着色器并进行优化。
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void fragmentMain(FragmentInput fsInput, inout czm_modelMaterial material) {
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// code goes here. e.g. to set the diffuse color to a translucent red:
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//代码在这里。例如将漫反射颜色设置为半透明的红色：
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material.diffuse = vec3(1.0, 0.0, 0.0);
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material.alpha = 0.5;
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}
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`,
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}
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});
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</script>
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</body>
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</html>
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