Plot contour in ParaView

Dear LAMMPS users,

I am trying to post-processing my simulation results using ParaView. I first converted dump file into ensight file format using The script is attached behind.

import sys
from dump import dump
from ensight import ensight

Then, I imported the .case file into ParaView. Now I have the coordinate, damage scalar, and velocity for each point. I wonder how can I use the Contour filter in ParaView to plot contours? When I try to do that, I got only one coloring option called Solid Color. How can I use damage or velocity as the coloring options?