visualization using VTK format

Hi there
I’m a little confused about how to visulize using the vtk

I’m using POLYGONS (squares) to respresent the mesh. and tehn i use CELL_DATA to set the pressure values for each cell. But paraview wont interpolate colors for CELL_DATA, but it does so for POINT_DATA. Also any good ideas to map the velocities (x,y) to point_data without interpolation(mesh trick)?

P.D: if anyone has a sample .vtk file that can share, it would be really appreciated it

thanks in advance

I always write my fluid simulation data (pressure, velocity,…) as point data directly.
If you do not need polygons I wouldn’t use them.
For what do you use the polygon data?