Objects creation and modification	Modifying existing objects
Modifying splines
Procedure      Commands

Refining the shape of a spline

It is possible to improve the accuracy of a spline by acting on the number of control points. The example displayed here below shows that dragging the central grip of the spline will cause the curve to adapt.

A  spline with definition of tangency at its extremes will also display a (green) grip on every extreme with tangent properties.