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I have geometry being created through geometry nodes and I am am trying to flip the normals on this duplicate geometry. However, it appears that normals are a read only attribute in the geometry nodes. Any ideas on how I can flip normals through geometry nodes?

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2 Answers 2

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You can now use the Flip Faces node.

enter image description here

You can also plug a boolean field into the Selection input to selectively flip faces.

For example :

enter image description here

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It is possible to flip normals for any single face. You just have to do several steps:

  1. Detach selected face from mesh.
  2. Put this face into convex hull.
  3. Delete from convex hull all faces with normals orientation equal to normals orientation of the original face.

enter image description here

I already applied this solution in my answer here: Is extrude possible in Geometry Nodes?

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  • $\begingroup$ can you apply this to every face in a mesh? $\endgroup$ Mar 20, 2022 at 22:35

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