@orangesky Thanks for the interesting question, I'll try to give you a full answer based on my experience. It's my first time making the interior so I also had to figure out many things down the road. This is quite a small scene, so I can afford to build it inside the 3D software, but if we are speaking about something…
They use UDK for lighting because you are expecting to know a game engine for most jobs. It doesnt have to be the engine that company is using, they just need to know you can navigate engines and have skills to use the tools. It's far better to be able to show a level in a game engine than in max or maya. Looks better on…
mikiex: I agree! Konamis Fox Engine, Square Enix Luminous Engine and Capcoms Panta Rhei Engine. Very happy to see they are finally catching up. Hopefully it will bring back their self-confidence in game creation.
You may ask this on the BlenderArtists thread ( a user with your name register three days ago :wink: ..or if that's not you i can do ) of the developer.. https://blenderartists.org/t/ossim-bake-simulations-to-armature-unreal-engine-unity-now-with-blender-4-0-support/1115900/52?u=okidoki
File formats are interchangeable, the engine is most likely the same, it was gamebryo(which is a rendering engine) that they replaced with their own stuff.