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Need some advice regarding lighting a terrain

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Hi all, Just looking for some ideas or opinions in regards to what I am attempting to research for my Honours dissertation. I am trying to achieve near photorealistec lighting for my demo. I currently have a procedurally generated terrain that is lit using a simple directional lighting. I have been reading up on the High dynamic range image based lighting method but I am not sure if its the right direction me. As a rough idea this is what I will basing my research on :
As you can see its not what I would call realistic ;) I am planning to apply lighting effects onto it so it could maybe look close to something from Crysis. Can I achieve that without the use of extensive 3D models? Is it possible to generate the environment map procedurally? How would I set the properties for the material in the scene? The whole terrain mesh if drawn from a single texture at the moment. Sorry if these questions seem trivial. There's so much information to take in now and I am hoping someone could give me a nudge in the right direction. Thank you.

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