Hi @lee,
If I understand what you are saying correctly, liboptix.so.6.0.0 was found when using the demo file, but not when using your own script. The demo files don’t make any changes to your LD_LIBRARY_PATH, so if they work then your LD_LIBRARY_PATH should be set up correctly. Does your script modify LD_LIBRARY_PATH at all, such that the OptiX library would no longer be part of it?