I have same question about unity... How world of warcraft have a Big map and him dont laggy he use Lod realy? is possible to give Graphic look like skyrim on unity using immageEffects? how i can when i change terrain to change skybox over terrain change? thanks for all reply
World of Warcraft doesn't load the whole world all at once. It loads portions of the world as they are needed. There is a feature in Unity to do something similar, but you need Unity Pro to access it.
Doesn't Application.LoadAdditive kinda what the OP was asking for? To my knowledge it isn't a Pro feature (or is it?).