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Ben Boeckel authored
It uses `vtkMatrix3x3` which comes from `Common/Math` and is not a dependency of `Common/Core`. Move it to `DataModel` instead so it can depend on it.
f0ddcf7c
It uses `vtkMatrix3x3` which comes from `Common/Math` and is not a dependency of `Common/Core`. Move it to `DataModel` instead so it can depend on it.