API Reference > geometry-core > Curve > LineString3d > appendPlaneIntersectionPoints appendPlaneIntersectionPoints Method find intersections with a plane. Intersections within segments are recorded as CurveIntervalRole.isolated Intersections at isolated "on" vertex are recoded as CurveIntervalRole.isolatedAtVertex. appendPlaneIntersectionPoints(plane: PlaneAltitudeEvaluator, result: CurveLocationDetail[]): number Parameter Type Description plane PlaneAltitudeEvaluator result CurveLocationDetail[] Returns - number Defined in core/geometry/src/curve/LineString3d.ts Line 850 Last Updated: 13 June, 2024