Really the top of the list was to tell a story in the single-player campaign that has a focus on the characters. With neural net AI, you run a hundred thousand simulations, and you build a database of tendencies - it can bring a more natural and a smarter opponent to the AI. The other thing we've added is a little bit of neural net AI as well as the handcrafted AI we already use. So it's a wonderful system for moving hundreds of units. You provide one graph, one destination on a map that will take every unit from that location to that point. It's also got a brand new lighting model - we use a global illumination model, we use a point-cloud system, all-new shadowing, all-new water, new pathfinding system. This game we've improved that so that we push the geometry over, and we leave it there.

It actually gobbled up a lot of the system performance, made the game require a pretty beefy system. The old one used a dynamically tessallating model so that as you zoomed in and out there were different levels of triangle density and then the CPU had to push that over the bus to the GPU. We, on the other hand, completely rewrote the rendering engine. See when people sequel games, they tend to give it a paint job, add a little of this, a little of that.

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