Orthographic / Parallel Projection in 3D view
Every 3D package, even those designed for games and animation, provide the option to render the scene without perspective correction (usually in their view menu). ParaView seems to be missing this option or the option is deeply obfuscated. Orthographic projection can be useful for accurate interpretation of data and is absolutely required for comparing astronomical observations with numerical simulations. If such an option still exists then it should be either documented or made more obvious.