CV curves are NURBS curves controlled by control vertices (CVs). CV does not lie on the curve. They define a control lattice containing curves. Each CV has a weight that can be adjusted to change the curve.

When creating a CV curve you can create multiple CVs at the same location (or nearby locations), which will increase the influence of the CVs within the area of ??the curve. Create two overlapping CVs to sharpen the curvature. Create three overlapping CVs to create a corner on the curve. This technique can help shape the curve, but the effect is lost if the CVs are then individually moved. (The influence of multiple CVs can be obtained by fusing CVs.

A CV curve can be the basis for an entire NURBS model.