Partially fog

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okey, my budy came with idea that worked :-)
here it is:

;render upper view(without fog)
CameraFogMode g_hNormalCamera, 0 ;turn of fog
HideEntity g_hUnderwaterScene
EntityAlpha g_hPlayer, 0 ;'HideEntity g_hPlayer
ShowEntity g_hAboveWaterScene
ShowEntity hWaterPlane
RenderWorld
CopyRect 0, 0, 1024, 768, 0, 0, BackBuffer(),ImageBuffer(g_hImageBufferUp)

;render down view (with fog)
CameraFogMode g_hNormalCamera, 1
EntityAlpha g_hPlayer, 1 ;'ShowEntity g_hPlayer
HideEntity g_hAboveWaterScene
HideEntity hWaterPlane
Showentity g_hUnderWaterScene
RenderWorld
CopyRect 0, 0, 1024, 768, 0, 0, BackBuffer(), ImageBuffer(g_hImageBufferDown)

; SetBuffer BackBuffer()
DrawImage g_hImageBufferUp, 0, 0
DrawImage g_hImageBufferDown, 0, 0