Wasn't it Coridon Henshaw who wrote:

>3) Object lighting is calculated incorrectly when mapping warps are used in 
>normals and the object is rotated.  This behavior does not appear to be 
>specified in the documentation.
>
>Example scene:
>
>sphere {<0,0,0>, 1 pigment {rgb 0.5}
>    normal
>    {
>        bozo
>        scale <2.0/pi,0.5/pi,1 >*0.025
>        warp {spherical orientation z}
>
>    }
>    /* Render this scene without the rotate directive and compare the
>       results. With rotation, the sphere is nearly black.*/
>    rotate x*90
>}
>
>camera {location z*2.5 look_at 0} light_source {<0,0,1e6> rgb 1}

Confirmed


-- 
Mike Williams
Gentleman of Leisure

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