A selected face can define a plane.
Any three selected points can define a plane.
View rotates to match plane.
Display a grid to show the plane, and have sub grid plus snap options.
Cursor is a cross hair on the plane.
Click makes a point.
Ctrl click deletes a point.
Shift click makes an edge from last point ( or most recent selected
point) to new point.
Click drag selects points.
Shift click drag adds to selection.
Ctrl click drag subtracts from selection.
Ctrl-T makes triangle faces from points selection.
Ctrl-B makes boundary edge from points selection.
Alt click drag moves point.
If I have this tool, plus a function to then wrap this plane over any
3D surface in K-3D (UV map?) then I can sketch a very large number of
forms very quickly.
The resulting mesh should also be convertible to nurbs etc.
Being able to unfold a 3D surface into such a drawing plane, edit it
and then wrap the result back to the original or a copy would be very
useful. But unwrapping 3D surfaces is not a trivial problem.
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