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OpenGL Directional Light Orientation from a Rotation Matrix?

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Hi all! AFAIK, OpenGL use the position of the directional light and the 0,0,0 coordinates to compute the light orientation. However, in a 3d package like XSI, the position of the light as no effect on the light orientation but the rotation of the light itself is use instead. now, any idea how could we get an OpenGL directional light orientation from a rotation matrix? Any other concept is welcome, thx

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