- we cannot assume to have a geometry at position (0, 0, 1) this initialize at (0, 0, 0)
- also don't hardcode the unit in the UI file
- also fix wrong property description
- property "Radius" is not used in the code and it seems it is only there as copy paste bug once the point filter was implemented. However close to a release, keep the property and just mention it is unused.
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