If you are interested in exporting 3D models from your favorite 3D tool to your favorite game engine in COLLADA (dae) format, you may want to look at the following tutorials: Autodesk Maya: http://vandaengine.org/maya Autodesk 3ds Max: http://vandaengine.org/3ds-max Blender: http://vandaengine.org/blender Cinema 4D: http://vandaengine.org/cinema-4d/