loss of legend and coordinate system at conversion u3d --> pdf

Hello,

I want to generate a 3D pdf from a u3d diagram via Rich Media. It works fine for all data, however, during that conversion I lost the coordinate system and the legend which are both important. 

In the web I found 3d pdfs with coordinate systems, so it should generally be possible. However, I do not know if it works with adobe Pro (what I use).

Does someone know if this is caused by the creation of my u3d file (in Matlab), if legend and coordinate system were lost during conversion to 3d pdf, or if it is just a visibility issue in my final pdf?

Thanks, best regards,

Ingo