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Move a directional light according to the camera movement

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Given a light direction, how can I [i]move[/i] it according to the camera movement, in a shader?
Think that an artist has setup a scene (e.g., in 3DSMax) with a mesh in center of that and a directional light with a position and a target. From this position and target I've calculated the light direction. Now I want to use the same direction in my lighting equation but, obviously, I want that this light moves correctly with the camera.

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