I'm currently developing a simulation and I intend to use VTK for visualisation. Furthermore, I fell a bit stupid right now, as I do not find a good example on how to generate the data for VTK. There are many examples that start from reading the data and then do some visualisation with it.
BUT what is with the other side? I will have a FEM mesh with up to billions of nodes on many computing nodes. How do people feed this into "something" (probably a file) suitable as input for VTK? Is it possible with VTK to already do some pre-processing in the distributed simulation application in order to reduce the amount of data?
I think, a link to a good example or tutorial would be more than helpful. Currently I'm just lost in the amount of information available.