# SPLINE Command [GstarCAD 2022](Help%20System/GSTARCAD/2022/Index.md) → [Commands](Help%20System/GSTARCAD/2022/Commands/(Commands).md) → [S](Help%20System/GSTARCAD/2022/Commands/S/(S).md) ## Function Description: This command is used to create smooth curves through or near a group of fit points. The SPLINE is called non-uniform rational B-spline (NURBS), for simplicity, called splines. It is defined by fit points. By default, the fit points are coinciding with spline. ## Command Access: > **Icon:** >  > **Menu:** Draw \> Spline > **Ribbon:** Home \> Draw \> Spline > **Toolbar:** Draw \> Spline > **Command:** SPLINE > **Alias:** SPL ## Command Prompts: Specify first point or \[Object\]: Specify next point: Specify next point or \[Close/Fit tolerance\] \<start tangent\>: ## **First point** Specifies the first point of a spline. ## **Object** Converts 2D or 3D polylines that fitted by quadric splines or cubic splines to equivalent splines. Users can save or discard the original polyline by setting the DELOBJ system variable. ## **Next point** Prompts to create other splines, pressing Enter to end the command prompts. ## **Close** Closes the spline by defining the last point coincides with the first point. By default, the closed spline is periodic and keeps curvature continuously along the entire ring. ## **Fit tolerance** Specifies the offset of fit points of a spline. If the fit tolerance is 0, the created spline passes through all fit points. The fit tolerance is applied on all fit points (except the start point and the endpoint). ## **Start tangent** Specifies the tangent condition at the starting point of a spline. ## **End tangent** Specifies the tangent condition at the ending point of a spline.