Haha. Now we're getting deeper, ain't we?
I don't dream about Hammer, though I also get the best ideas laying in the bed right before sleeping. I usually draw or write them and do them the next morning. Once, I wrote a poem from 12:30 to 1:30 until I considered it good enough.
Also, about that thought of the world being the best real-time-light engine: Of course it is.
If you would have need to build a computer simulating the whole world, it would have to be as least as big as the world itself, because there is no better way to store information than in the natural world. (Which stores the source information of everything).
Additionally, said computer wouldn't be able to run faster than our universe and therefore simulate the future, because in this case, the computer (from which we suppose to be perfect) would need to calculate also the reactions of the people living on earth when they see what will happen in their future; therefore the computer needs to calculate the earth and itself as also the reaction of earth to itself, what changes the earth again and so on... what leads to the conclusion that said computer would need to be of infinite space.
What means in the end that a perfect simulation of the earth would be a duplicated earth right next to the original one, which could not predict the future. Kinda useless.
If you have not given up yet: It doesn't need to be like I have described: Suppose that said computer would, in fact, exist and predict the future. In that case, the computer would have to make such predictions that in the end, everything fits like a puzzle. For example: the computer says that Bob will die tomorrow in England. Bob rushes towards the airport to get away as much as possible from his homecountry France and incidentally takes the flight to London, which crashes.
The whole thing would then be like the time travel paradoxa, only the other way round.