Mesh Editing

Hi,

I've added mesh editing took a little longer than I though due to 
incorporating invalid triangle code. Triangle points with the same 
coordinates share control points. If there both smooth triangles and the 
normals also match, they will also share a control point.

If an edit makes one of the triangles invalid, the whole change is reverted. I 
though this was what people would expect. Rather than having just that one 
triangle unchanged, and splitting its point off from others.

-- 
Leon Pennington

"Programming, it's an art form that fights back."

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