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It's probably operator error on my part but I have been quite unsuccessful producing a useable 3D PDF export (V21 w/Communicator, Win10).
So far, every attempt I've made has yielded a PDF with a black background and a model which is also flat black. I can change the background color to white in the PDF reader but nothing I have tried has affected the PDF model appearance. It's there and can be manipulated but, since it's a uniform flat black, it only appears as a silhouette with no visible features.
3D PDF files from e.g. McMaster-Carr are okay in the PDF reader with a white background and gray surface colors.
So, I'm obviously missing something. Any suggestions?