How to light both sides of a curved surface patch

Hi,
I made a B Spine patch and used GeometryInfor and NormalGenerator to get GeometryArray. Everything worked fine except only one side of the surface was lit. Is it possible to generate normal for both side of the surface using some J3D utility. I know how to write code to do it myself.
Thank you very much.
wz

I had two shapes in mind, one with the normals pointing in the original direction and the other one with normals pointing in the opposite direction. But as I am writing this, I am wondering if it wouldnt be possible to use just one shape and duplicate each triangle or quad in the geometry array. Maybe it would even be an option to use an indexed array and just double the indexes (reuse the points). I have absolutely no idea about the implications for performance, but I am looking forward to your findings.
alain

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