Progressive Mesh - A great polygon reduction tool that changes the level of detail in real-time.

Action3D Reducer Demo 1.1
Action3D Reducer is a great polygon reduction tool that changes the level of detail in real-time and creates both .3ds and .x files. To reduce a 3d object, Reducer creates a progressive mesh. Then, you can reduce and increase the number of triangles displayed by the progressive mesh in real-time using a slider control.
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