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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.

The figure, does not work

If I do it with UV sphere it works

Sphere, works

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  • $\begingroup$ Why Normal? Why not Position? $\endgroup$
    – Robin Betts
    Jun 28, 2022 at 16:42
  • $\begingroup$ I didn't actually know what are the normals, but now I understand $\endgroup$
    – Eneary
    Jun 28, 2022 at 17:12

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

enter image description here

The normals of the faces are definitely not the right way here, because they always point away from a face with a unit vector, and thus do not provide useful values for a position comparison on the Z-axis.

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    $\begingroup$ Thank you a lot, it helped $\endgroup$
    – Eneary
    Jun 28, 2022 at 16:46

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