# SURFU System Variable [GstarCAD 2022](Help%20System/GSTARCAD/2022/Index.md) → [System Variables](Help%20System/GSTARCAD/2022/System%20Variables/(System%20Variables).md) → [S](Help%20System/GSTARCAD/2022/System%20Variables/S/(S).md) **Function Description:** The SURFU system variable is used to set the surface density in M direction for PEDIT Smooth option and the U isolines density on surface objects. | | | | --- | --- | | Type | Integer | | Saved in | Drawing | | Initial value | 6 | | Range | 0 \~ 200 | Meshes are always created with the smallest density of 2\. ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/S/SURFU%20System%20Variable--92070d81a943.md) · [GstarCAD 2017](Help%20System/GSTARCAD/2017/System%20Variables/S/SURFU%20System%20Variable--92070d81a943.md) · [GstarCAD 2018](../../../2018/System%20Variables/S/SURFU%20System%20Variable--92070d81a943.md) · [GstarCAD 2019](../../../2019/System%20Variables/S/SURFU%20System%20Variable--92070d81a943.md) · [GstarCAD 2020](../../../2020/System%20Variables/S/SURFU%20System%20Variable--92070d81a943.md) · [GstarCAD 2021](Help%20System/GSTARCAD/2021/System%20Variables/S/SURFU%20System%20Variable--92070d81a943.md)