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Bezier surfaces are:
used for any smooth surface constructed from a small array of control points, where the input of the designer overrides any need for a precisely defined surface; for example, in automobile panel design.
produced with the Bezier (Surface menu) command, interpolating between control points to affect the total surface contour.
a subset of the more general B-Spline surface.
a simple way of creating a smooth fillet in a profile, or as a ‘best fit’ approximation between control points if you are not interested in following the points too closely (except at the end points).
In EdgeCAM, the Bezier curve is faster to compute than a B Spline. Unlike B-Splines however, if you alter the position of one control point in a Bezier surface, the entire surface is recalculated.
The properties of a Bezier surface can be altered using the Entity Data (Edit menu) command.