glb加载参考：cesium 添加几何对象 entity primitive_cesium.js 添加几何体-CSDN博客

使用entity方式加载的glb，默认会开启动画，但使用primitive加载的glb，需要手动开启动画

let modelPosition = Cesium.Cartesian3.fromDegrees(...position)
let modelMatrix = Cesium.Transforms.headingPitchRollToFixedFrame(modelPosition, new Cesium.HeadingPitchRoll(Cesium.Math.toRadians(heading - 90)));
let model = primitiveCollection.add(
    Cesium.Model.fromGltf({
        url: url,
        minimumPixelSize: 50,
        modelMatrix: modelMatrix,
        scale
    })
);

model.readyPromise.then((model) => {
    // 手动开启动画
    model.activeAnimations.addAll({
        loop: Cesium.ModelAnimationLoop.REPEAT // 让动画循环播放
    });
});