【解决办法】参考示例: //s3mInstance添加s3m模型
var s3mInstanceColc = new Cesium.S3MInstanceCollection(scene._context);
scene.primitives.add(s3mInstanceColc);
s3mInstanceColc.add('./data/car/qiche10.s3m', {
id: 1,
position: new Cesium.Cartesian3.fromDegrees(116.4717575064941,39.92171235599680, 20),
});