In addition to its complete 3D geometry kernel, Open Inventor® by VSG provides robust support of advanced 3D features, such as NURBS surfaces and collision detection. Open Inventor by VSG delivers full support of NURBS curves and trimmed surfaces with unlimited order, and allows for fast, efficient and crack-free NURBS tessellation. It also provides a fast collision detection engine both between objects and between the camera and the scene, which prevents for example the camera from penetrating other objects in walkthrough type applications. This optimized collision detection engine has proven to be efficient even on very complex scenes.