See these lines:
https://i10git.cs.fau.de/hyteg/hyteg/-/blob/ea67fb68bce15ae9fa87ce619179cafc8987f122/src/hyteg/volumedofspace/VolumeDoFFunction.cpp#L43
https://i10git.cs.fau.de/hyteg/hyteg/-/blob/ea67fb68bce15ae9fa87ce619179cafc8987f122/src/hyteg/volumedofspace/VolumeDoFFunction.cpp#L92
Should be dataHandlingGL.
