Do you have any solution of this problem? I have the same problem as you. I put U3D in PDF file using my program but the default light always none. I need to set the default lighting scheme to the "Lights from file" or "CAD Optimized Lights". So can you please tell me what the solution you have? Thanks.
> I put U3D in PDF file using my program
Read PDF spec and take a look at libharu (latest versions) opensource library for examples of embedding 3D models into PDF.
Or be more specific on what steps did you take in your program to set lights, so that someone can spot problems in your approach.
Providing useful advice knowing nothing more but that your program does not produce desired results requires advanced telepathy skills.
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