This tutorial is based on Blender 2.56a beta interface (see getting started section of the Blender site tutorial page). I will show you how to fix a non-manifold...
blender: fixing a non-manifold mesh
The Blender Game Engine is a component of Blender, a free and open-source comprehensive 3D production suite, used for making real-time interactive content. The game engine was written from scratch in C++ as a mostly independent component, and includes support for features such as Python scripting and OpenAL 3D sound.
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