Flipped normals when i mirror a block

[Japhy]

Sounds similar to the Revit Family issue with Mirrored Rhino blocks.

Rhino blocks to revit family, Issue with mirrored blocks

This is really tough, in general Mirroring produces inconsistent ‘handedness’. A part that is mirrored may not be able to manufactured as the same part. Say a mullion cap with a milled out edge. [image] Rhino flips the Z, which is what actually happens, two parts that if manufactured would not be identical. Revit uses a Flipped Face Flag, or Handed Flag depending on the element. So the Z remains the same but it internally flips per one Axis of your choosing. If the Block/Family is conceptua…