I''m working on a 3D version of the engine used in Transport Tycoon, and I''m looking for details of what I should actually DO in my engine... AFAIK, it should read the data from a data file, interpret it, and in my case, output it through a modular (OpenGL/DX) rendering library. It should also mannage sound and music threads. But my problem lies in where to put everything! Does anyone have any suggestion as to what I should do?

download the G3D engine from www.genesis3d.com and check out how they did it.. it''s open source and rivals some of the best engines out there