I considered something like this last night as I stay up to 6am working on a new UI library. My conclusion was in part because it's easy. The goal is well defin

I considered something like this last night as I stay up to 6am working on a new UI library. My conclusion was in part because it's easy. The goal is well defined. I got the first widget working thought I'd call it a day (a night) but then it was so much fun to just implement the next widget mostly because very little design iteration is needed. The problem being solved is well known so each thing to tick off my UI lib was only a few minutes. Next thing I know it's 6am. I think the same is true of 3D libraries. The real work of making an app that does 3D is not the 3D engine, it's everything else (UX or GameDev). The 3D part has well known goals and solutions so it feels like you're making a ton of progress, ie, it's fun to make. Much easier than deciding harder things like which features your app should have and how they should work.