toSegment
Converts spline to a Segment.
Converts the current 3D Catmull-Rom spline segment into a cubic Bézier curve representation.
This function calculates the four control points required for a cubic Bézier curve using the Catmull-Rom spline's positions and its alpha value determining the tension. The resulting cubic Bézier curve spans between p1
and p2
of the Catmull-Rom segment.
Return
A Segment3D object representing the equivalent cubic Bézier curve of the Catmull-Rom spline segment.