Cinema 4D Program Documentation Reference Cinema 4D Basic Features Spline Menu
Function available in CINEMA 4D Prime, Visualize, Broadcast, Studio & BodyPaint 3D

Soft Interpolation

This command switches all selected points to soft interpolation. If no points are selected, all points of the splines are changed automatically to soft interpolation.

Soft interpolation means that the tangents of the appropriate points are set to a standard length and direction.

Before.
After.

Note:
This command is not available for B-Splines.