I agree with Pogmahone and Flak, stick in a square 2d blank pic so that the shadow falls on it, it probably won't show any curvature to the shadow.

This is not my "second childhood". I'm not finished with the first one yet.

Time flies like an arrow; fruit flies like a banana.

"I'd like to die peacefully in my sleep like my grandfather....not screaming in terror like the passengers on his bus." - Jack Handy