SpeedTree is fully integrated into Epic's Unreal engine including both the editor and the rendering engine. We provide a wrapper class that plugs directly into NDL's Gamebryo. Because SpeedTree is a numerical engine, there's nothing to prevent it from working with any given 3D engine. Our customers have successfully integrated SpeedTree into more than twenty different rendering systems including commercial game engines, scenegraph APIs, and in-house engines. We are constantly adding direct support for new engines so please contact us for more information. If you want to see how SpeedTree would work with your engine, please sign up for a free evaluation. RenderWare integration is coming soon, as well as a Maya-based world builder.