Hi, first of all, great idea and great tool. There are so many nice apis out there which could now easily beeing turned into libraries. I just tried it with an api set of tropical trees which I found on AVSIM: The trees of the original apis are supposed to turn to aircraft but they don't do. Is there anything I could tweak to make them doing so? Instead of turning to the aircraft, the texture is now displayed on both sides of the planar. What was the reason again why this older textures do not show their transparency (black)? I know how to make it by giving them an alpha channel (I had one done for testing in the picture)but forgot why they do not show directly.