Trying to filter FloatGrid using pointdatagrid but cannont go back to floatGrid

[LouisNoailles]

Hi,
I am trying to use point data grids to use openvdb point filtering but I need to keep the float value of voxels during this process to retrieve it afterwards.
I followed the openvdb cookbook methods but I think it does not keep information value appart from position and I want to reconvert the point data grid to a float grid at the end of the filtering and I didn't find any method to do so.
Any idea ?