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How about glTF? It's a JSON based scene description which uses inline data or references to external binary files, with an option for a single binary "glb" data

• meheleventyone 9y ago
  glTF is already gaining some traction as a model format. But it’s scene support is more what you’d see for modelling software than what you’d have for a game engine where the scene description is more about the game entities and the data glTF provides is usually abstracted out. glTF is a great idea for providing a sensible interchange format for models though. Even this data usually gets converted into a custom binary format for the runtime engine to consume depending on use. Although as you note glTF has its own binary format and I understand it’s going to be improved with support for compression like Basis so perhaps that will reduce the need for custom formats for all but the most optimised cases.