Using vtkProbeFilter to sample values of NIFTI volume onto surface

Hi,

i have a fMRI NIFTI volume whereby each voxel value corresponds to a
statistical value indicating the activation. I am using the vtkProbeFilter
to show the activation on the
corresponding brain surface. The results looks pretty good but I would like
to understand what is really going on when using the vtkProbeFilter.

Assumed that I specify a tolerance value of 10.0 <+49100>, how the filter
determines the corresponding scalar value for a certain surface vertex?
Is the filter simply assigning the value of the closest voxel to the
vertex? Or is the filter averaging all values within the specified
tolerance?

Thank you!

Regards, Michael

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