Update 3d tiles terrain sandcastle

Apps/Sandcastle/gallery/Globe Materials – 3D Tiles Terrain.html

@@ -31,11 +31,8 @@
       window.startup = async function (Cesium) {
         "use strict";
         //Sandcastle_Begin
-        Cesium.Ion.defaultAccessToken =
-          "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiJkNjM1MGY2MS1kM2FiLTRiMTYtOWJiZS04MTQ0MTE0Y2FmNGUiLCJpZCI6NDQsImlhdCI6MTY3NzY1NjMzOH0.JJo27pEISY-weTVJNaOJNnM9WIdZckds9dpVtVzGNXE";
-
         const terrainProvider = await Cesium.Cesium3DTilesTerrainProvider.fromIonAssetId(
-          2735384,
+          3923568,
           {
             requestVertexNormals: true, // Needed for hillshade lighting
             requestWaterMask: true, // Needed to distinguish land from water

packages/sandcastle/gallery/globe-materials-3d-tiles-terrain/index.html

@@ -0,0 +1,8 @@
+<style>
+  @import url(../templates/bucket.css);
+</style>
+<div id="cesiumContainer" class="fullSize"></div>
+<div id="loadingOverlay"><h1>Loading...</h1></div>
+<div id="toolbar">
+  <div id="zoomButtons"></div>
+</div>

packages/sandcastle/gallery/globe-materials-3d-tiles-terrain/main.js

@@ -0,0 +1,93 @@
+import * as Cesium from "cesium";
+
+const terrainProvider =
+  await Cesium.Cesium3DTilesTerrainProvider.fromIonAssetId(3923568, {
+    requestVertexNormals: true, // Needed for hillshade lighting
+    requestWaterMask: true, // Needed to distinguish land from water
+  });
+
+const viewer = new Cesium.Viewer("cesiumContainer", {
+  terrainProvider: terrainProvider,
+  scene3DOnly: true,
+  sceneModePicker: false,
+  navigationHelpButton: false,
+});
+
+// Create a globe material for shading elevation only on land
+const customElevationMaterial = new Cesium.Material({
+  fabric: {
+    type: "ElevationLand",
+    materials: {
+      waterMaskMaterial: {
+        type: "WaterMask",
+      },
+      elevationRampMaterial: {
+        type: "ElevationRamp",
+      },
+    },
+    components: {
+      diffuse: "elevationRampMaterial.diffuse",
+      alpha: "1.0 - waterMaskMaterial.alpha", // We'll need the inverse of the watermask to shade land
+    },
+  },
+  translucent: false,
+});
+
+const minHeight = -414.0; // approximate dead sea elevation
+const maxHeight = 8777.0; // approximate everest elevation
+const elevationRamp = [0.0, 0.045, 0.45, 0.5, 0.55, 1.0];
+function getColorRamp() {
+  const ramp = document.createElement("canvas");
+  ramp.width = 100;
+  ramp.height = 1;
+  const ctx = ramp.getContext("2d");
+
+  const values = elevationRamp;
+
+  const grd = ctx.createLinearGradient(0, 0, 100, 0);
+
+  // See https://gis.stackexchange.com/questions/25099/choosing-colour-ramp-to-use-for-elevation
+  grd.addColorStop(values[0], "#344f31");
+  grd.addColorStop(values[1], "#5b8742");
+  grd.addColorStop(values[2], "#e6daa5");
+  grd.addColorStop(values[3], "#fdc771");
+  grd.addColorStop(values[4], "#b99d89");
+  grd.addColorStop(values[5], "#f0f0f0");
+
+  ctx.fillStyle = grd;
+  ctx.fillRect(0, 0, 100, 1);
+
+  return ramp;
+}
+
+const globe = viewer.scene.globe;
+const material = customElevationMaterial;
+const shadingUniforms = material.materials.elevationRampMaterial.uniforms;
+
+globe.showWaterEffect = false;
+globe.enableLighting = true;
+
+shadingUniforms.minimumHeight = minHeight;
+shadingUniforms.maximumHeight = maxHeight;
+shadingUniforms.image = getColorRamp();
+globe.material = material;
+
+// 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
+const scene = viewer.scene;
+scene.light = new Cesium.DirectionalLight({
+  direction: new Cesium.Cartesian3(1, 0, 0), // Updated every frame
+});
+
+// Update the light position base on the camera
+const scratchNormal = new Cesium.Cartesian3();
+scene.preRender.addEventListener(function (scene, time) {
+  const surfaceNormal = Cesium.Ellipsoid.WGS84.geodeticSurfaceNormal(
+    scene.camera.positionWC,
+    scratchNormal,
+  );
+  const negativeNormal = Cesium.Cartesian3.negate(surfaceNormal, surfaceNormal);
+  scene.light.direction = Cesium.Cartesian3.normalize(
+    Cesium.Cartesian3.add(negativeNormal, scene.camera.rightWC, surfaceNormal),
+    scene.light.direction,
+  );
+});

packages/sandcastle/gallery/globe-materials-3d-tiles-terrain/sandcastle.yaml

@@ -0,0 +1,6 @@
+legacyId: Globe Materials – 3D Tiles Terrain.html
+title: Globe Materials – 3D Tiles Terrain
+description: Apply materials to the globe.
+labels:
+  - Showcases
+thumbnail: thumbnail.jpg