// 鼠标绘制的两个点
const start = linePoint[0]
const end = linePoint[1]
const direction = Cesium.Cartesian3.subtract(
end,
start,
new Cesium.Cartesian3()
)
const up = Cesium.Cartesian3.UNIT_Z
const normal = Cesium.Cartesian3.cross(direction, up, new Cesium.Cartesian3())
Cesium.Cartesian3.normalize(normal, normal)
clippingPlanes = new Cesium.ClippingPlaneCollection({
planes: [new Cesium.ClippingPlane(new Cesium.Cartesian3(1, normal.y, 0), 0)],
})
feature.clippingPlanes = clippingPlanes
