# SURFU System Variable [GstarCAD 2026](Help%20System/GSTARCAD/2026/Index.md) → [System Variables](Help%20System/GSTARCAD/2026/System%20Variables/(System%20Variables).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. --- [Original help](https://www.gstarcad.net/help/GstarCAD_2026_en-US/detail/systemVariables/SURFU.html) · © Gstarsoft Co., Ltd.