# Active Spline

Reference

- Mode
編輯模式

- 選單

The *Active Spline* panel is used in Edit Mode to control properties of the currently selected spline.

Common Options

- Cyclic U
Closes the active spline.

- Resolution U
Alters the resolution of each segment by changing the number of subdivisions.

- Smooth
Use Smooth Shading for any 3D geometry.

## Poly

- Cyclic U
See Common Options.

- Smooth
See Common Options.

## Bézier

- Cyclic U
See Common Options.

- Resolution U
See Common Options.

- Interpolation Tilt
Alters how the tilt of a segment is calculated.

- Radius
Alters how the radius of a beveled curve is calculated. The effects are easier to see after increasing the radius.

- Smooth
See Common Options.

## NURBS

One of the characteristics of a NURBS object is the *knot vector*.
This is a sequence of numbers used to determine the influence of the control points on the curve.
While you cannot edit the knot vectors directly,
you can influence them through the *Endpoint* and *Bézier* options in the Active Spline panel.
Note that, the *Endpoint* and *Bézier* settings only apply to open NURBS curves.

- Cyclic U
See Common Options.

- Bézier U
Makes the NURBS curve act like a Bézier curve. The NURBS control points act like

*Free*handles of Bézier curve.- Endpoint U
Makes the curve contact the end control points.

- Order U
The order of the NURBS curve determines the area of influence of the control points over the curve. Higher order values means that a single control point has a greater influence over a greater relative proportion of the curve. The valid range of

*Order*values is 2-6 depending on the number of control points present in the curve.- Resolution U
See Common Options.

- Smooth
See Common Options.