The VTK-9.1.0 version you are using does not include the fix for the crash that happens when point normals are missing. You can either use a more recent VTK version or add normals to your points.
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The VTK-9.1.0 version you are using does not include the fix for the crash that happens when point normals are missing. You can either use a more recent VTK version or add normals to your points.