Runtime terrain loading, Partial terrain loding

I am using a very huge terrain in TPS Game. So that i don’t want to load whole terrain in first time. But i wish to load terrain step by step not fully load.I wish to load 25% terrain first then after sometime other 25% terrain loading and continue this process until the whole terrain load.

Terrain have lots of obstacles and some required objects(lights,dust,animated objects, etc)also attached.

This same process i wish to implements in both platform Android and IOS.

you could make 4 different terrains each in it’s own scene, and use LoadLevelAdditive to load another part of terrain (e.g. when player reaches some trigger placed in the edge of loaded terrain). And you could delete unused terrains later.