Snap 3d sketch entities to a mesh (scan data)

[Seth789]

Pull is a nice function to make T splines fit scan data, but it falls short in some cases and I think we need more control.

I want to be able to snap 3d sketch entitys to a mesh.  Points, lines, splines, etc.  effectivaly drawing directly on the scan data as a first step in creating surface models.

If there is already way to do this, or something similar, please comment.

Thanks

[colin.smith]

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