Extract Q criterion isosurface each X timesteps
 

Hi all,
I was wondering how to properly extract a Q criterion isosurface (for example Q= 1000 s^-2 colored by pressure coefficient) each X timesteps. The purpose of this is to create a video which will be a very interesting postprocessing result, and it would be very time-consuming to do manually for each of the X timesteps!!
The problem I guess is to set the correct view and display (I am using journals to run the simulations).
Regards!