> I always felt this was such an outrageous burden to developers but the point is that it's not a burden? You get it for free. Unless you mean having accommoda

> I always felt this was such an outrageous burden to developers but the point is that it's not a burden? You get it for free. Unless you mean having accommodate in your app the fact that someone else's might be "shading" it or similar. I think it's amazing: you can have a real world light source coloring a virtual object which is then a reflective light source that bounces off to affect rendering of a second app. And you don't have to do any of it, the OS is rendering all of this. It's fully analogous to say, your OS supporting transparency on a 2d window frame such that if I'm looking at one window I can see the one behind it. But in 3d and incorporating real world pass through it is so much more complex.