I've been fascinated with a few addons like 3d engines, particle systems, etc. I'm wondering...are they also using the built in render pipeline like we all use or is there a low level way to interface with Flash and create your own render routines in C,C++, etc? Papervision3d for instance, is that just a collection of source code you can add to your app or is it adding something to the flash kernal at runtime? Thanks for the tech info.