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Moving Directional Light's not working in DX

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G'day I'm trying to set up a moving directional light that just cycles between (0,1,1) and (0,-1,1). I've got the vector calculations working fine, and the _D3DLIGHT9 structure is being updated properly but the light doesn't appear to move. I also tried calling SetLight() each time I update the vector, but that doesn't seem to change anything either. Any ideas ?

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