你好,如果你不想要这个背景的话,可以选择设置skyBox,
ltSkyBox = new Cesium.SkyBox({
sources: {
positiveX: './images/蓝天/Right.jpg',
negativeX: './images/蓝天/Left.jpg',
positiveY: './images/蓝天/Front.jpg',
negativeY: './images/蓝天/Back.jpg',
positiveZ: './images/蓝天/Up.jpg',
negativeZ: './images/蓝天/Down.jpg'
}
});