API Reference > geometry-core > Numerics > MomentData > areEquivalentPrincipalAxes areEquivalentPrincipalAxes MethodStatic Test for match among selected members as they exist after inertiaProductsToPrincipalAxes The members considered are origin of local to world map (i.e. centroid) radius of gyration axes of localToWorldMap. Axis direction tests allow these quirks: opposite orientation is considered matched. Full xyz symmetry: If x,y,z radii are matched, axes are not tested. Symmetry in xy plane: If x and y radii are matched, the x and y axes area allowed to spin freely. Only Z direction is tested. If either or both are undefined, returns false. areEquivalentPrincipalAxes(dataA: undefined | MomentData, dataB: undefined | MomentData): boolean Parameter Type Description dataA undefined | MomentData first set of moments dataB undefined | MomentData second set of moments Returns - boolean Defined in geometry4d/MomentData.ts Line 221 Last Updated: 12 June, 2024