材质部分的代码如下

	// 自定义材质
	const customMaterial = new Cesium.Material({
	  translucent: true,
	  fabric: {
		uniforms: {
		  image:circle_img,
		  speed:30.0,
		},
		source: `
		czm_material czm_getMaterial(czm_materialInput materialInput)
		  {
			czm_material material = czm_getDefaultMaterial(materialInput);
			vec2 st = materialInput.st;
			float rot = radians(czm_frameNumber * speed/1000. * 45.0);
			st-=.5;
			mat2 m = mat2(cos(rot), -sin(rot), sin(rot), cos(rot));
			st  = m * st;
			st+=.5;
			material.diffuse = texture(image,st).rgb;
			return material;
		  }`,
	  },
	});