Light Map Maker is a tool for real-time 3D developers, it's main feature is adding realistic lighting to real-time 3D scenes. It's robust lighting utility support ray tracing lighting, realistic radiosity lighting, and caustics, mirror, ...
Light Map Maker provides a SDK(c++) for importing/exporting various data; now supports some popular 3D formats; so it's compatible with most game development software.
) "Light Map Maker - Click to enlarge screenshot")