Advanced Bezier Surfaces from Curves
Create and edit various kinds of advanced Bezier surfaces from Bezier curves, arcs, circles and lines
Advanced Bezier Surfaces from Curves

This extension adds a toolbar and items to the Draw menu with tools to create Skinned, Ruled with Spine and Coons with Spine rational Bezier surfaces from non-rational and rational Bezier curves, arcs, circles and lines, as demonstrated in the animations(click the thumbnails) above.

Once the surface has been created, the tools will put you into the editing tool for the newly drawn surface. If needed, the surface can be edited to be the way you want it to be by moving the points or lines of the resulting control net or adjusting the "weights" of the control points.

Inferencing is available when a control point or line is moved along with inference locking using the Shift key. Hitting the Esc key during a move will reset the surface to the way it was before the move started.

In order to change the weight of a non-end control point, hover the cursor over the control point you want to change the weight of so that it is highlighted in green, type the new weight you want for it, without moving the cursor away from the control point, and press enter/return to influence the shape of the surface.

Later, selecting an existing Bezier surface drawn/edited with these tools and using Edit Rational Bezier Surface in the Right Mouse Button Context menu will also activate the editing tool for the selected surface.

Note that this a continuation of the Bezier Surfaces from Curves extension. Also, shamelessly plugging another of my paid extensions, the Rational Bezier Surface Properties extension can be used to edit the resultant Bezier surface's properties such as degree(s) and number of segments used to represent/display it.