 modelMatrix: modelMatrix,
                    asynchronous: false
                }));

                viewer.camera.flyToBoundingSphere(new Cesium.BoundingSphere(position, 100000));

                // 6 创建material
                // 6.1 创建纯色material
                colorMaterial = new Cesium.Material({
                    fabric: {
                        type: 'Color',
                        uniforms: {
                            color: new Cesium.Color(1.0, 1.0, 0.0, 1.0)
  