# UCSXDIR System Variable [GstarCAD 2022](Help%20System/GSTARCAD/2022/Index.md) → [System Variables](Help%20System/GSTARCAD/2022/System%20Variables/(System%20Variables).md) → [U](Help%20System/GSTARCAD/2022/System%20Variables/U/(U).md) **Function Description:** The UCSXDIR system variable is used to store the X direction of current UCS in current viewport of current space. (Read-Only) | | | | --- | --- | | Type | 3D point | | Saved in | Drawing | | Initial value | 0.0000,1.0000,0.0000 | The X direction of UCS can be different for each viewport.