        });
                // 6.4 创建自定义shader的material
                // 模拟纯色到图像的过渡过程
                customMaterial = new Cesium.Material({
                    fabric: {
                        type: 'MyCustomShader1',
                        uniforms: {
                            image: './images/earth.png',
                            color: new Cesium.Color(1.0, 1.0, 0.0, 1.0),
                            cellAlpha: 0.3
                        },
       