# Delete the bottom half of a geometry along the Z-axis using geometry nodes

I just can't figure it out why it does not delete half of a mesh. Trying to do so in geometry nodes.

I want to delete the bottom half of it along the Z-axis but I can't, it acts like it has only 6 faces, these subdivided faces aren't helping at all.

Normals of new faces do not seem correct, I don't know why. It's like there is only 3 states for faces: -1, 1, nearly 0.

If I do it with UV sphere it works

• Why Normal? Why not Position? Jun 28 at 16:42
• I didn't actually know what are the normals, but now I understand Jun 28 at 17:12

If you want to remove the lower half of the geometry, I would use the input node Position instead of the input node Normal: