# SURFACEAUTOTRIM System Variable [GstarCAD 2017](Help%20System/GSTARCAD/2017/Index.md) → [System Variables](Help%20System/GSTARCAD/2017/System%20Variables/(System%20Variables).md) → [S](Help%20System/GSTARCAD/2017/System%20Variables/S/(S).md) **Function Description:** The SURFACEAUTOTRIM system variable is used to set whether to auto trim surface when geometry projecting to surface. | | | | --- | --- | | Type | Integer | | Saved in | Registry | | Initial value | 0 | | Range | 0,1 | **System Variable Value:** **0:** do not trim surface when geometry projecting to surface. **1:** auto trim surface when geometry projecting to surface --- ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/S/SURFACEAUTOTRIM%20System%20Variable--2fef43d1a19a.md) · [GstarCAD 2018](../../../2018/System%20Variables/S/SURFACEAUTOTRIM%20System%20Variable--2fef43d1a19a.md) · [GstarCAD 2019](Help%20System/GSTARCAD/2019/System%20Variables/S/SURFACEAUTOTRIM%20System%20Variable--2fef43d1a19a.md) · [GstarCAD 2020](../../../2020/System%20Variables/S/SURFACEAUTOTRIM%20System%20Variable--2fef43d1a19a.md) · [GstarCAD 2021](Help%20System/GSTARCAD/2021/System%20Variables/S/SURFACEAUTOTRIM%20System%20Variable--2fef43d1a19a.md) · [GstarCAD 2022](Help%20System/GSTARCAD/2022/System%20Variables/S/SURFACEAUTOTRIM%20System%20Variable--2fef43d1a19a.md)