Blender has this very useful Remove doubles for vertices, but often, when importing models created with Wings3D, I end up with models containing overlapping edges. This creates problems with subsurfs. After removing doubles, recalculating normals, etc, subsurfed models still have these odd areas in them. I discovered that the culprit seems to be additional edges hidden under colinear vertices. Something like this:
An extra edge is present which connects the end vertices, but is hidden from view because it is underneath.
Is there any way of detecting and removing these extra edges?
I’m doing this by temporarily moving vertices to see if any hidden edges are present, but there has to be an easier way.