The up direction of the analysis part (in the global coordinate system). The axis vector (connecting member end nodes) and the up direction vector define the local XY plane of the member. The local Z can be calculated as localZ = localX x UpDirection (cross product), and after this localY = localZ x localX (cross product).
Assembly: Tekla.Structures.Analysis (in Tekla.Structures.Analysis.dll) Version: 2022.0.13611
Property ValueType: Vector