你好请问用下面代码添加的贴图在两侧,请问如何贴到上顶面
viewer.entities.add( {
polylineVolume: {
positions: entity.polyline.positions._value,
shape: [
new Cesium.Cartesian2(-1, -1),
new Cesium.Cartesian2(1, -1),
new Cesium.Cartesian2(1, 1),
new Cesium.Cartesian2(-1, 1),
],
outlineWidth:500,
cornerType: Cesium.CornerType.MITERED,
material: imageMaterial,
outline: true,
outlineColor: Cesium.Color.BLACK,
}
})