                      },
                        components: {
                            diffuse: 'color.bgr',
                            alpha: 'color.a'
                        }
                    },
                    translucent: false
                });
                // 6.2 创建图像material
                imageMaterial = new Cesium.Material({
                    fabric: {
                        type: 'Image',
                        uniforms: {
                            im