3D Tiles 缩放

var position = Cesium.Cartesian3.fromDegrees(x, y, z);
var m = Cesium.Transforms.eastNorthUpToFixedFrame(position);

var scaleM = Cesium.Matrix4.fromUniformScale(params.scale);
Cesium.Matrix4.multiply(m, scaleM, m);

tileset._root.transform = m;