It seems impossible to generate more than a single cross section per 3D view. According to the PDF specification the /SA key in a 3DView dictionary takes an array as its value. Nevertheless, only the last element (object reference to 3DCrossSection dictionary) in the list will be displayed in Adobe Reader (9, X), other cross sections are ignored. Is this intended behaviour or is it a bug?
Alexander
The 3D annotation type in Acrobat and Adobe Reader only supports one active cross section plane at a time.