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bool IsCulled(vec4 normal) { return normal.z > 0; }

from my understanding, this function will only accurately determine if a face should be culled for a voxel at the point (0, 0, 0), as it does not differentiate per voxel. You can imagine that if the voxels were presented with a face directly toward the view, then voxels to the far right should have their right face culled, while voxels to the far left should not have their right face culled.