About Performing a Symmetry

This sub-topic gives you general information when performing a symmetry.

• The symmetry keeps the curvature continuity of the subdivision surface, therefore some details of the input mesh will be modified.
• As the result of the symmetry is a subdivision surface, you can perform a symmetry of a symmetry or copy-paste a symmetry or use this feature to associate other subdivision surfaces.
• If the face of the subdivision surface has only one vertex on the chosen side, the result of the symmetry is a mirror surface.
• The display of the projection plane depends on the option selected for transparency in Me > Preferences > Display > Performance > Transparency Quality: either Low (Screen Door) or High (Alpha Blending). See Native Apps Preferences Guide: : General: Display: Performance.

This sub-topic explains how a symmetry is performed depending on the shape of the subdivision surface.

• If the surface is U-shaped, you cannot select a side as it is automatically chosen:
  
  
• If the symmetry plane intersects a S-shaped surface, the symmetry cannot be performed. Below is an example using the green plane, the symmetry cannot be performed:
  
  

  Below is an example using the red plane: the symmetry can be performed.