cesium绘制爆炸效果

Cesium是一个用于构建虚拟地球应用程序的JavaScript库，可以使用它来绘制爆炸效果。下面是一个简单的示例：

1. 导入Cesium库

<script src="https://cesium.com/downloads/cesiumjs/releases/1.79/Build/Cesium/Cesium.js"></script>
<link href="https://cesium.com/downloads/cesiumjs/releases/1.79/Build/Cesium/Widgets/widgets.css" rel="stylesheet">

2. 创建场景

<div id="cesiumContainer"></div>
<script>
  var viewer = new Cesium.Viewer('cesiumContainer');
</script>

3. 创建爆炸效果

<script>
  var explosion = viewer.entities.add({
    position: Cesium.Cartesian3.fromDegrees(0.0, 0.0, 1000.0),
    billboard: {
      image: 'path/to/explosion.png',
      sizeInMeters: true,
      scaleByDistance: new Cesium.NearFarScalar(1.5e2, 1.0, 1.5e7, 0.0),
      translucencyByDistance: new Cesium.NearFarScalar(1.5e2, 1.0, 1.5e7, 0.0),
    },
    point: {
      color: Cesium.Color.YELLOW.withAlpha(0.5),
      pixelSize: 50,
      distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0.0, 1.5e7),
    },
    properties: {
      time: 0.0,
      lifetime: 1.0,
    },
  });
  
  viewer.clock.onTick.addEventListener(function (clock) {
    var time = explosion.properties.time;
    var lifetime = explosion.properties.lifetime;
    if (time > lifetime) {
      viewer.entities.remove(explosion);
      return;
    }
    var factor = time / lifetime;
    var size = Cesium.Math.lerp(0.0, 50000.0, factor);
    explosion.billboard.scale = size;
    explosion.point.pixelSize = size / 1000.0;
    explosion.point.color = Cesium.Color.YELLOW.withAlpha(0.5 - 0.5 * factor);
    explosion.properties.time = time + clock.deltaTime / 1000.0;
  });
</script>

这段代码创建了一个在(0,0,1000)位置的爆炸效果，使用了一个贴图作为billboard，同时在爆炸中心创建了一个闪烁的点，随着时间的推移，爆炸效果逐渐消失。可以根据需要调整位置、贴图、颜色、大小等参数来创建不同的效果。