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
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.