# ISOLINES System Variable [GstarCAD 2024](Help%20System/GSTARCAD/2024/Index.md) → [System Variables](Help%20System/GSTARCAD/2024/System%20Variables/(System%20Variables).md) → [I](Help%20System/GSTARCAD/2024/System%20Variables/I/(I).md) ## Function Description: The ISOLINES system variable is used to specify the number of contour lines displayed on the curved surfaces of 3D solids. | | | | --- | --- | | Type | Integer | | Saved in | Drawing | | Initial value | 4 | | Range | 0 ~ 2047 | --- [Original help](https://www.gstarcad.net/help/GstarCAD_2024_en-US/detail/systemVariables_Igsv/ISOLINES.html) · © Gstarsoft Co., Ltd.