Hi adamio, I have not really looked into the Apple Metal API.

> The question is (considering you going for a major rewrite) Wouldn't it be a better
> investment for the long term to adapt Metal instead of OpenGL?

Well, it would not be good for future additional cross platform considerations - the Metal API is proprietary to Apple and is unlikely to be supported on other operating systems like Linux for example.

Also I would not be surprised if they will only make it available on pretty new versions of OSX, it's unlikely to be back ported to old versions. So that would make it a bad choice for compatibility even with OSX since it would prevent MoI from running on many versions of OSX currently in use...

So those are some big compatibility limiting problems that I would see with that strategy. Those are big enough problems that my first impression is that it would not make sense to target it instead of OpenGL for current considerations.

- Michael