## Description

*Curve* segments can be created freely in three dimensional space and are cubic polynomials between successive points. Their slope is defined either
by a *Catmull-Rom*, *Akima* or *Bezier* control algorithm. Choose which slope control is used in the *Curve Segment Options*
frame.

Use the Curve Segment Options frame to choose either Catmull-Rom, Akima or Bezier slope control for Curve segments.

**Catmull-Rom:** The slope at a given point is parallel to a chord between the two adjacent points. At the end of a curve, the slope will be
tangent to the end point and the adjacent point.
**Akima: ** The slope at a given point uses a stencil of five consecutive points and produces curves with fewer “wiggles” or overshoot. One
result of the five point stencil is that three consecutive points which lie on a line will have linear slope between them.
**Bezier:** Allows slope control at each control point. The slope must remain continuous. If a slope discontinuit is desired, a new segment
must be started at the location of the discontinuity.