Short description of error
Symmetrize and Mirror Modifier change the Normals on a Mesh
Exact steps for others to reproduce the error
I tried to use Symmetrize on a unsymmetrical mesh body but it ended up like in this picture:
The mesh is unsymmetrical, because it has in total 2207 vertices and the left side of it has 1105, whereas the right side has 1103 vertices.
To recreate the bug:
Simple .blend file:
I went into Edit mode and selected all the vertices and then clicked on Mesh -> Symmetrize (the destructive operation)
But also I tried the non-destructive mirror modifier, which ended up in the same result.
I have to note that the mesh is using "Custom Splits Normal Data" already applied to it.
2.79 Date: 2018-04-16 16:13 Hash: eb6fe5fa94b