I am visualizing large 3d gridded data using paraview. AFAIK, all voxels are rendered, independent if the user can see them or not. In other words, if i have a “big” cube that consist of 3x3 smaller cubes, the center one should not be rendered, unless user decide to slice the data.
This depends of the representation in use, but considering you are using “Surface Representation”, then this is incorrect, only the surface is rendered.