"Asymmetric Bridge is a complete set of plugins for data exchange between main 3d software packages. For example, if you have animated character in XSI but want to render him using Maya.
So, you simply export mesh and animation data to custom bridge format and then import it in Maya. Asymmetric Bridge is able to seamless transfer polygon meshes, UV coordinates, NURBS surfaces, cameras and animation between Autodesk Maya and Autodesk Softimage much faster (up to 10 times faster) than standard ways.
It is possible to transfer even very large scenes and complicated models from one application to another using this toll. Please note that this program does not transfer shading normal attributes onto mesh.
Asymmetric Bridge supports most common Windows operating systems and Linux distributives should also work. It supports the following applications: Autodesk 3dsmax 2009, 2010, 2011, Autodesk Maya 2009, 2010, 2011, and Autodesk Softimage 7.