128 lines
5.0 KiB
HTML
128 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 name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
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<meta name="description" content="Dynamically rotate a model's wheels based on its velocity using node transformations.">
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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 type="text/javascript" src="../../../ThirdParty/requirejs-2.1.20/require.js"></script>
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<script type="text/javascript">
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require.config({
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baseUrl : '../../../Source',
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waitSeconds : 60
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});
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</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"></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));
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var totalSeconds = 10;
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var stop = Cesium.JulianDate.addSeconds(start, totalSeconds, new Cesium.JulianDate());
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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(-2379556.799372864, -4665528.205030263, 3628013.106599678);
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var endPosition = new Cesium.Cartesian3(-2379603.7074103747, -4665623.48990283, 3627860.82704567);
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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(position, false);
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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(start, factor * totalSeconds, new Cesium.JulianDate());
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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(startPosition, endPosition, locationFactor, new Cesium.Cartesian3());
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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 += ((Math.PI * 2 * totalSeconds) / numberOfSamples) * 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(time, result) {
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return Cesium.Quaternion.fromAxisAngle(Cesium.Cartesian3.UNIT_X, wheelAngleProperty.getValue(time), result);
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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 : '../../../../Apps/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(0.0, 100.0),
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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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startup(Cesium);
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} else if (typeof require === 'function') {
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require(['Cesium'], startup);
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}
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</script>
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</body>
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</html>
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