convert vtk point data to cell data

I want to convert my vtk point data files to cell data files with a specific cell size, my data is basically 100,000 points data moving in a cylinder, and those points have several variables such as velocity and coordination. could anyone help me out with this problem?

I try to use paraview to give them volumn but cannot be a cylinder. The "point data to cell data" filter cannot save my variables correctly, anyone can help with this case? sorry I cannot share my开发者_开发技巧 data due to some other reasons, maybe some hints could help me out of this.

Many thanks in advance!