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FPS games use quaternion or matrix?

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I don''t know about the latest games, but Quake 1 used simple Euler angles for rotations. (BAD!!! )

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Guest Anonymous Poster
These days people use quaternions in order to manipulate or store orientations. But when the time comes that you want to transform a whole lot of vertices, you temporarily convert the quaternion to a matrix, transform all the vertices by that matrix, then throw away the matrix.

-Jonathan.

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