For best results, make large scale changes
at coarser (lower-numbered) levels and small-scale changes at finer
levels.
To line up vertices, rotate an edge in
the camera plane while approximating it to be tangent to the surface.
To remove standard mode edits (transformations)
on a vertex, select the vertex and press the Delete key. This does
not actually remove the vertex, but moves it back to its original
position.
