# View a Curve Plot

Display a curvature plot to see how the curvature varies along a curve.

For any point on a curve (except lines), a circle can be constructed that resembles the tangent direction and the curvature of the curve at that point. The inverse of the circle's radius, calculated as (1.0 / radius), is the curvature of the curve. The curvature plot draws curvature values sampled at a number of points along the curve as vectors normal to the curve and with a length proportional to the curvature. The end points of the normal vectors are then connected to form a curve. This latter curve is used to verify whether the NURBS curve is "fair" or not. The "fairness" of a curve is a completely subjective matter. In general, a curve is fair if its curvature plot is continuous and as smooth as possible.