Would seem that at least particles, sprites, 2D layers, collisions, and dynamic textures are not in three.js. There's also mesh hierarchies, animations, and mir

Would seem that at least particles, sprites, 2D layers, collisions, and dynamic textures are not in three.js. There's also mesh hierarchies, animations, and mirrors in Babylon.js, which I'm not sure if three.js supports those as first-class concepts or not. Syntax seems pretty similar, which is not terribly surprising.