To simplify what I want to do, from the pvtu data, I would like to get the contours of compositions by coordinate points(i.e extract the coordinates of contours) and use them for some further analysis(e.g. integrate temperature field inside one of the contours).
I didn’t find a solution in visit, but I have explored it myself by looking at the cpp vtk package. With a couple of trials, I am able to get the data points of a contour from a .ptvu file, but I have also encountered some problems.
Most of all, I don’t know if this is the right path to follow or a rabbit hole, I’d like to know how you will proceed with the question since I know you have a lot of experience with visualization and post-processing data.