# SPLINE command

The **SPLINE** command is used to create smooth curves through or near a group of fit points.

**Command Access:**

**Ribbon** : Home > Draw > Spline **Menu** : Draw > Spline **Command** : SPLINE

**Command Prompts:**

Specify first point or [Object]:

Specify next point:

Specify next point or [Close/Fit tolerance] :

Specify start tangent:

Specify end tangent:

**Function Description:**

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.

**Relative Glossary:**

**First point:**

Specify the first point of a spline.**Object:**

Convert 2D or 3D polylines that fitted by quadric splines or cubic splines to equivalent splines. Users could save or quit original polylines by setting the DELOBJ system variable.**Next point:**

Prompt to create other splines, press ENTER to end the command prompts.**Close:**

Close the spline by defining the last point coincides with the first point. By default, the closed spline is periodicity and keeps curvature continuously along the entire ring.

**Fit tolerance:**

Specify the offset of fit points of a spline. If the fit tolerance is 0, the created spline goes through all fit points. The fit tolerance is applied on all fit points (except the start point and the end point).**Start tangent:**

Specify the tangent condition at the start point of a spline

**End tangent:**

Specify the tangent condition at the end point of a spline.