This is crazy! And needs a very strong rig.
No longer just a Beta, Vermillion now allows you to enter the virtual gameworld of a game, set up your canvas, and then paint the scene of the game from within the game using Vermillion, like a real painter painting the landscape in which he stands.
The following is a scene from the game Alyx, its neither special nor especially beautiful, but illustrates the idea. I wonder if they add multiplayer to this option also (normal paitntign alreadsy allows it). Imagine this, you and two real world friends stand on the mountains of Skyrim and your game companion also is around, and you all look down on Whiterun and you all three set up your canvas and see your two buddies doing their painting while you do your own - it starts to get crazy, sort of, eh?!
