API Reference > geometry-core > CartesianGeometry > Ellipsoid > createPlaneSection createPlaneSection Method Construct an arc for the section cut of a plane with the ellipsoid. this is undefined if the plane does not intersect the ellipsoid. createPlaneSection(plane: Plane3dByOriginAndUnitNormal): undefined | Arc3d Parameter Type Description plane Plane3dByOriginAndUnitNormal Returns - undefined | Arc3d Defined in geometry3d/Ellipsoid.ts Line 403 Last Updated: 11 June, 2024