Allan McKay with this tutorial as a quick overview of what type of scale it’s good to work in (accurate world scale most of the time) and what if – especially for FX you need to scale your scene down or up to make it easier to work with. 3D Studio Max is quite sensitive to scales at times, so sometimes you do have to force your scales down, and this is just a quick overview of the whole issue of Scale and if/when/how to scale your entire scenes down and still have them match the other scales render passes.
Easily scaling entire 3D scenes for FX from Allan McKay on Vimeo.