I am trying to fit my engine into neat little namespaces but I am having trouble deciding what goes where. I was planning to have a Core namespace with things like: Object Mnagement, logging, Opengl extension Loader, Renderer, texture management, etc.. a Math namespace with things like: Vectors, matricies, quanternions,etc.. an input/output namespace with things like: Model Loader, Texture Loader, Terrain Loader a Graphics namespace with things like: Sky Box, Shadows, Water, etc.. However I have no idea where something like my Camera class or my Frostrum class would go. Any suggestions?