B-spline Curves tool frame

Place a B-spline curve or Curve by tangents,

or

Place a composite curve,

or

Construct interpolation by arcs,

or

Place a conic, spiral, or helix,

or

Offset an element,

or

Extract Iso-parametric lines,

or

Calculate a curve.

Change to active curve settings,

or

Rebuild a curve,

or

Extend a curve,

or

Change the direction of an element,

or

Convert an element to a B-spline,

or

Construct a blend curve,

or

Drop a B-spline curve,

or

Flatten, or project a curve,

or

Deform a curve

or

Evaluate a curve.