2025-04-20 01:30:00 +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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<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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</head>
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<body style="
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margin: 0;
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overflow: hidden;
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background: #fff;
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width: 100%;
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height: 100%;
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position: absolute; top: 0;
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">
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<div id="map" style="margin: 0 auto; width: 100%; height: 100%"></div>
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<script type="text/javascript">
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Cesium.Ion.defaultAccessToken =
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2025-06-07 11:30:00 +00:00
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"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiIyMjBhMzcxMC0wNjBiLTRmYjItYjY1MC0wMzAwMzMyMGUyMmEiLCJpZCI6MzAzNzc3LCJpYXQiOjE3NDc2Mzk0NTV9.E_90aKtVdzRGlU2z48VwJ4mWvl-uuDkfQBCOO6zbzn4";
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2025-04-20 01:30:00 +00:00
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const viewer = new Cesium.Viewer("map", {});
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viewer.scene.debugShowFramesPerSecond = true;
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/*
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1. 顶点着色器（Vertex Shader）坐标变换、传递数据给片段着色器、动态变形
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2. 片段着色器（Fragment Shader）计算颜色、应用光照、后处理效果
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*/
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const customShader = new Cesium.CustomShader({
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uniforms: {
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u_height: {
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type: Cesium.UniformType.FLOAT,
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value: 10.0
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},
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},
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fragmentShaderText: `
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void fragmentMain(FragmentInput fsInput, inout czm_modelMaterial material) {
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float height = fsInput.attributes.positionMC.y;
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vec3 lowColor = vec3(0.0, 0.0, 1.0); // 蓝色
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vec3 highColor = vec3(1.0, 0.0, 0.0); // 红色
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if(height > u_height){
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material.diffuse = lowColor;
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}else{
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material.diffuse = highColor;
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}
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}
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`,
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});
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const tileset = new Cesium.Cesium3DTileset({
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url: "./data/tileset.json",
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customShader: customShader
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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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setInterval(() => {
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if (customShader.uniforms.u_height.value == 100) {
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customShader.uniforms.u_height.value = 10;
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}
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if (customShader.uniforms.u_height.value < 100) {
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customShader.uniforms.u_height.value += 3;
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}
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}, 100)
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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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</script>
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</body>
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</html>
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