# 3DOSMODE System Variable [GstarCAD 2026](Help%20System/GSTARCAD/2026/Index.md) → [System Variables](Help%20System/GSTARCAD/2026/System%20Variables/(System%20Variables).md) → [3D](Help%20System/GSTARCAD/2026/System%20Variables/3D/(3D).md) ## Function Description: The 3DOSMODE system variable is used to control 3D object snap settings. | | | | --- | --- | | Type | Integer | | Saved in | Registry | | Initial value | 11 | | Range | 0 ~ 256 | ## System Variable Value: **1:** all 3D object snaps are disabled. **Shortcut key:** ZNON **2:** snap a vertex or a control point. **Shortcut key:** ZVER **4:**snap a middle point on a face edge. **Shortcut key:** ZMID **8:**snap the center point on a face. **Shortcut key:** ZCEN **16:** snap a knot of a spline or surface. **Shortcut key:** ZKNO **32:** snap a vertical face(planar faces only). **Shortcut key:** ZPER **64:** snap an object nearest to a face. **Shortcut key:** ZNEA **128:** snap the nearest point on planar segment of point cloud. **Shortcut key:** PNOD **256:** all 3D object snaps are disabled. **Shortcut key:** PNEA **Note：**this system variable can control which 3D object snap enabled. The setting is stored as a bitcode using the sum of listed system variable values.Users can specify more than one object snap by entering the sum of their values. Taking 6 for example, it means to specify the vertex and middle point object snaps. --- [Original help](https://www.gstarcad.net/help/GstarCAD_2026_en-US/detail/systemVariables_3Dgsv/3DOSMODE.html) · © Gstarsoft Co., Ltd.