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172 lines
5.9 KiB
HTML
172 lines
5.9 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
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name="description"
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content="Dynamically rotate a model's wheels based on its velocity using node transformations."
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/>
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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
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class="sandcastle-loading"
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data-sandcastle-bucket="bucket-requirejs.html"
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>
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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"></div>
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<script id="cesium_sandcastle_script">
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function startup(Cesium) {
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"use strict";
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//Sandcastle_Begin
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var viewer = new Cesium.Viewer("cesiumContainer", {
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shouldAnimate: true,
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});
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//Make sure viewer is at the desired time.
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var start = Cesium.JulianDate.fromDate(new Date(2018, 11, 12, 15));
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var totalSeconds = 10;
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var stop = Cesium.JulianDate.addSeconds(
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start,
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totalSeconds,
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new Cesium.JulianDate()
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);
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viewer.clock.startTime = start.clone();
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viewer.clock.stopTime = stop.clone();
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viewer.clock.currentTime = start.clone();
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viewer.clock.clockRange = Cesium.ClockRange.LOOP_STOP;
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viewer.timeline.zoomTo(start, stop);
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// Create a path for our vehicle by lerping between two positions.
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var position = new Cesium.SampledPositionProperty();
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var startPosition = new Cesium.Cartesian3(
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-2379556.799372864,
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-4665528.205030263,
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3628013.106599678
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);
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var endPosition = new Cesium.Cartesian3(
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-2379603.7074103747,
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-4665623.48990283,
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3627860.82704567
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);
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// A velocity vector property will give us the entity's speed and direction at any given time.
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var velocityVectorProperty = new Cesium.VelocityVectorProperty(
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position,
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false
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);
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var velocityVector = new Cesium.Cartesian3();
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// Store the wheel's rotation over time in a SampledProperty.
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var wheelAngleProperty = new Cesium.SampledProperty(Number);
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var wheelAngle = 0;
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var numberOfSamples = 100;
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for (var i = 0; i <= numberOfSamples; ++i) {
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var factor = i / numberOfSamples;
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var time = Cesium.JulianDate.addSeconds(
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start,
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factor * totalSeconds,
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new Cesium.JulianDate()
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);
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// Lerp using a non-linear factor so that the vehicle accelerates.
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var locationFactor = Math.pow(factor, 2);
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var location = Cesium.Cartesian3.lerp(
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startPosition,
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endPosition,
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locationFactor,
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new Cesium.Cartesian3()
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);
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position.addSample(time, location);
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// Rotate the wheels based on how fast the vehicle is moving at each timestep.
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velocityVectorProperty.getValue(time, velocityVector);
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var metersPerSecond = Cesium.Cartesian3.magnitude(velocityVector);
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var wheelRadius = 0.52; //in meters.
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var circumference = Math.PI * wheelRadius * 2;
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var rotationsPerSecond = metersPerSecond / circumference;
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wheelAngle +=
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((Math.PI * 2 * totalSeconds) / numberOfSamples) *
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rotationsPerSecond;
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wheelAngleProperty.addSample(time, wheelAngle);
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}
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function updateSpeedLabel(time, result) {
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velocityVectorProperty.getValue(time, velocityVector);
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var metersPerSecond = Cesium.Cartesian3.magnitude(velocityVector);
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var kmPerHour = Math.round(metersPerSecond * 3.6);
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return kmPerHour + " km/hr";
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}
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var rotationProperty = new Cesium.CallbackProperty(function (
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time,
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result
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) {
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return Cesium.Quaternion.fromAxisAngle(
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Cesium.Cartesian3.UNIT_X,
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wheelAngleProperty.getValue(time),
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result
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);
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},
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false);
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var wheelTransformation = new Cesium.NodeTransformationProperty({
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rotation: rotationProperty,
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});
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var nodeTransformations = {
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Wheels: wheelTransformation,
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Wheels_mid: wheelTransformation,
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Wheels_rear: wheelTransformation,
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};
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// Add our vehicle model.
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var vehicleEntity = viewer.entities.add({
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position: position,
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orientation: new Cesium.VelocityOrientationProperty(position), // Automatically set the vehicle's orientation to the direction it's facing.
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model: {
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uri: "../../SampleData/models/GroundVehicle/GroundVehicle.glb",
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runAnimations: false,
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nodeTransformations: nodeTransformations,
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},
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label: {
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text: new Cesium.CallbackProperty(updateSpeedLabel, false),
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font: "20px sans-serif",
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showBackground: true,
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distanceDisplayCondition: new Cesium.DistanceDisplayCondition(
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0.0,
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100.0
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),
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eyeOffset: new Cesium.Cartesian3(0, 3.5, 0),
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},
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});
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viewer.trackedEntity = vehicleEntity;
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vehicleEntity.viewFrom = new Cesium.Cartesian3(-10.0, 7.0, 4.0);
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//Sandcastle_End
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Sandcastle.finishedLoading();
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}
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if (typeof Cesium !== "undefined") {
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window.startupCalled = true;
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startup(Cesium);
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}
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</script>
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</body>
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</html>
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