Hi, I just double checked. I did check the "Compute Scalars" option. Best, Yifei > On Apr 7, 2015, at 3:44 PM, Utkarsh Ayachit <utkarsh.ayachit at kitware.com> wrote: > >> How can I use damage or velocity as the coloring options? > > Make sure you have "Compute Scalars" option checked on the > "Properties" panel for the Contour filter. > > Utkarsh