API Reference > geometry-core > CartesianGeometry > PlaneAltitudeEvaluator PlaneAltitudeEvaluator Interface Interface so various plane representations can be used by algorithms that just want altitude evaluations. Specific implementors are Plane3dByOriginAndUnitNormal Point4d (used for homogeneous plane coefficients) Implemented by ClipPlane Plane3dByOriginAndUnitNormal Methods Name Description altitude(point: Point3d): number Return the altitude of the point from the plane. altitudeXYZ(x: number, y: number, z: number): number Return the altitude of the point from the plane, with the point supplied as simple x,y,z velocity(vector: Vector3d): number Return the derivative of altitude wrt motion along a vector. velocityXYZ(x: number, y: number, z: number): number Return the derivative of altitude wrt motion along a vector given by components weightedAltitude(point: Point4d): number Return the weighted altitude Defined in core/geometry/src/Geometry.ts Line 99 Last Updated: 13 June, 2024