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I don't know how to use the LookAtMatrix. As you Know, when we multiply a point P(x,y,z) whit the RotateMatrix, it will get another point P'(x',y',z')which on the other side of one axis. But when the point P multiply the LookAtMatrix ,it will get what? A point ? yes, but the new point P(x',y',z') mean what?

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If you are referring to gluLookAt, then this sets up a virtual camera transformation (i.e. a translation and some rotations).

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To elaborate on what Kuladus said, a typical 'lookat' matrix transforms a point from world space into the local space of the camera. In more general terms, it is the camera's parent-to-local matrix, and the inverse of the camera's local-to-parent matrix.

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