mirror of https://github.com/CesiumGS/cesium.git
140 lines
5.0 KiB
HTML
140 lines
5.0 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta
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name="viewport"
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content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"
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/>
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<meta name="description" content="Apply materials to the globe." />
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<meta name="cesium-sandcastle-labels" content="Showcases" />
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<title>Cesium Demo</title>
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<script type="text/javascript" src="../Sandcastle-header.js"></script>
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<script
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type="text/javascript"
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src="../../../Build/CesiumUnminified/Cesium.js"
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nomodule
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></script>
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<script type="module" src="../load-cesium-es6.js"></script>
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</head>
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<body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
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<style>
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@import url(../templates/bucket.css);
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</style>
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<div id="cesiumContainer" class="fullSize"></div>
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<div id="loadingOverlay"><h1>Loading...</h1></div>
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<div id="toolbar">
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<div id="zoomButtons"></div>
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</div>
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<script id="cesium_sandcastle_script">
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window.startup = async function (Cesium) {
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"use strict";
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//Sandcastle_Begin
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const terrainProvider = await Cesium.Cesium3DTilesTerrainProvider.fromIonAssetId(
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3923568,
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{
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requestVertexNormals: true, // Needed for hillshade lighting
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requestWaterMask: true, // Needed to distinguish land from water
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},
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);
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const viewer = new Cesium.Viewer("cesiumContainer", {
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terrainProvider: terrainProvider,
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scene3DOnly: true,
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sceneModePicker: false,
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navigationHelpButton: false,
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});
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// Create a globe material for shading elevation only on land
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const customElevationMaterial = new Cesium.Material({
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fabric: {
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type: "ElevationLand",
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materials: {
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waterMaskMaterial: {
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type: "WaterMask",
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},
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elevationRampMaterial: {
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type: "ElevationRamp",
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},
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},
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components: {
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diffuse: "elevationRampMaterial.diffuse",
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alpha: "1.0 - waterMaskMaterial.alpha", // We'll need the inverse of the watermask to shade land
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},
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},
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translucent: false,
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});
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const minHeight = -414.0; // approximate dead sea elevation
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const maxHeight = 8777.0; // approximate everest elevation
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const elevationRamp = [0.0, 0.045, 0.45, 0.5, 0.55, 1.0];
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function getColorRamp() {
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const ramp = document.createElement("canvas");
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ramp.width = 100;
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ramp.height = 1;
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const ctx = ramp.getContext("2d");
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const values = elevationRamp;
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const grd = ctx.createLinearGradient(0, 0, 100, 0);
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// See https://gis.stackexchange.com/questions/25099/choosing-colour-ramp-to-use-for-elevation
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grd.addColorStop(values[0], "#344f31");
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grd.addColorStop(values[1], "#5b8742");
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grd.addColorStop(values[2], "#e6daa5");
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grd.addColorStop(values[3], "#fdc771");
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grd.addColorStop(values[4], "#b99d89");
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grd.addColorStop(values[5], "#f0f0f0");
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ctx.fillStyle = grd;
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ctx.fillRect(0, 0, 100, 1);
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return ramp;
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}
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const globe = viewer.scene.globe;
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const material = customElevationMaterial;
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const shadingUniforms = material.materials.elevationRampMaterial.uniforms;
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globe.showWaterEffect = false;
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globe.enableLighting = true;
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shadingUniforms.minimumHeight = minHeight;
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shadingUniforms.maximumHeight = maxHeight;
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shadingUniforms.image = getColorRamp();
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globe.material = material;
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// Light the scene with a hillshade effect similar to https://pro.arcgis.com/en/pro-app/latest/tool-reference/3d-analyst/how-hillshade-works.htm
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const scene = viewer.scene;
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scene.light = new Cesium.DirectionalLight({
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direction: new Cesium.Cartesian3(1, 0, 0), // Updated every frame
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});
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// Update the light position base on the camera
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const scratchNormal = new Cesium.Cartesian3();
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scene.preRender.addEventListener(function (scene, time) {
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const surfaceNormal = Cesium.Ellipsoid.WGS84.geodeticSurfaceNormal(
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scene.camera.positionWC,
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scratchNormal,
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);
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const negativeNormal = Cesium.Cartesian3.negate(surfaceNormal, surfaceNormal);
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scene.light.direction = Cesium.Cartesian3.normalize(
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Cesium.Cartesian3.add(negativeNormal, scene.camera.rightWC, surfaceNormal),
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scene.light.direction,
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);
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});
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//Sandcastle_End
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};
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if (typeof Cesium !== "undefined") {
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window.startupCalled = true;
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window.startup(Cesium).catch((error) => {
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"use strict";
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console.error(error);
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});
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Sandcastle.finishedLoading();
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}
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</script>
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</body>
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</html>
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