3 Julian Looser RaphaĆ«l Grasset Hartmut Seichter Mark Billinghurst 2006 International Symposium of Mixed and Augmented Reality (ISMAR 2006) Santa Barbara, CA, USA ISMAR We are presenting a software development framework called OSGART for Rapid Application Developement (RAD) in the domain of Mixed Reality (MR). This toolkit is being developed as an extension to OpenSceneGraph [3]. It implements a hierarchical, scenegraph based approach to marker based AR using the AR Toolkit [4]. Due to its’ tight integration with OpenSceneGraph it provides a valuable test environment for bi-directional transition between immersive Virtual Environments (IVE) and Augmented Reality (AR).