is this a problem? In my mind we shouldn't grab all kind of software and make FreeCAD dependent on it. It's the same for post-processing. There is a very good open-source software for this kind of tasks (paraview). Paraview is much more advanced in regard to post-processing capabilities than FreeCAD. I don't see a reason to implement some parts of paraview in FreeCAD. (This was done already, but I don't think it is very usable)Right now I export my designs as .stl to import into blender for rendering with cycles.
We should look how to simplify the interface between different programs and not how to copy stuff from other libraries into the FreeCAD-GUI. It may sound insane to bring cycles to FreeCAD, but it always involves much work. If we use cycles, we need something to define shaders. So we will try to copy the very well done node-style inputs from blender?...
paraview is good for postprocessing
blender is good for rendering
freecad is good for CAD-application