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Merge pull request #12149 from CesiumGS/water-mask-globe-material
Add water mask material
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Apps/Sandcastle/gallery/Globe Materials – Water Mask Elevation Map.html
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,144 @@ | ||
| <!DOCTYPE html> | ||
| <html lang="en"> | ||
| <head> | ||
| <meta charset="utf-8" /> | ||
| <meta http-equiv="X-UA-Compatible" content="IE=edge" /> | ||
| <meta | ||
| name="viewport" | ||
| content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no" | ||
| /> | ||
| <meta name="description" content="Apply materials to the globe." /> | ||
| <meta name="cesium-sandcastle-labels" content="Showcases" /> | ||
| <title>Cesium Demo</title> | ||
| <script type="text/javascript" src="../Sandcastle-header.js"></script> | ||
| <script | ||
| type="text/javascript" | ||
| src="../../../Build/CesiumUnminified/Cesium.js" | ||
| nomodule | ||
| ></script> | ||
| <script type="module" src="../load-cesium-es6.js"></script> | ||
| </head> | ||
| <body | ||
| class="sandcastle-loading" | ||
| data-sandcastle-bucket="bucket-requirejs.html" | ||
| > | ||
| <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> | ||
| <script id="cesium_sandcastle_script"> | ||
| window.startup = async function (Cesium) { | ||
| "use strict"; | ||
| //Sandcastle_Begin | ||
| const viewer = new Cesium.Viewer("cesiumContainer", { | ||
| terrain: Cesium.Terrain.fromWorldTerrain({ | ||
| requestVertexNormals: true, // Needed for hillshading | ||
| requestWaterMask: true, // Needed to distinguish land from water | ||
| }), | ||
| timeline: false, | ||
| animation: 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; | ||
| shadingUniforms.minimumHeight = minHeight; | ||
| shadingUniforms.maximumHeight = maxHeight; | ||
| shadingUniforms.image = getColorRamp(); | ||
|
|
||
| globe.material = material; | ||
| globe.showWaterEffect = false; | ||
| globe.enableLighting = true; | ||
| globe.maximumScreenSpaceError = 0.5; // Load higher resolution tiles for more detailed shading | ||
|
|
||
| // 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 = globe.ellipsoid.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 | ||
| ); | ||
| }); | ||
| //Sandcastle_End | ||
| }; | ||
| if (typeof Cesium !== "undefined") { | ||
| window.startupCalled = true; | ||
| window.startup(Cesium).catch((error) => { | ||
| "use strict"; | ||
| console.error(error); | ||
| }); | ||
| Sandcastle.finishedLoading(); | ||
| } | ||
| </script> | ||
| </body> | ||
| </html> |
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Apps/Sandcastle/gallery/Globe Materials – Water Mask Elevation Map.jpg
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