Select congruent edges

Support Modeling
1

Hi,

is there a way to select all congruent edges within a mesh? For example, the white edge in the middle…


…is congruent to the two smaller edges that you see if I pull the longer edge to the right: (there is no face between the longer and the smaller edges)


I fix this by deleting the long edge, which also deletes the adjacent bigger triangle. Then replace it by two smaller triangles so that it looks like this:


Now there are only the two smaller edges, each shared by two triangles.

In a big mesh, a lot has to be fixed manually, so is there a way to do it automatically? I’m already using the mesh analysis tools to find these “double” edges, but replacing them is pretty much work.

2

Since you are just going for tris, it seems you could: select all nonmanifold, deselect the edges of the object if you do not have a closed surface, delete the remaining nonmanifold geometry and then fill holes.

3

Or just remove doubles =)

4

I wrote " (there is no face between the longer and the smaller edges)" - but I was wrong. Sorry for that. I solved it now like DruBan said. Before, I selected and deleted those “empty” triangles by selecting on of them, then pressing Shift+G (= select similar) “face area” (area is zero).
Thanks.