GLC_lib is a C++ library for high performance 3D application based on OpenGL. GLC_lib 2.0 can handle very large DMUs (Digital MockUps) to create fast free multi platform OpenGL 3D viewers. Some of the new features include: Frustum Culling with OpenGL frustum Plane extraction; space partitioning using Octree; ability to save all supported 3D Formats in a 3DXML ASCII V4; built in 3DWidget; built in Plane sectioning with easy and powerfull manipulation tools. Supported file formats include COLLADA, 3DXML ASCII V3 and V4, OBJ, 3DS, STL (ASCII and binary), and OFF and COFF.