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Here is video produced by a company using a world editor made by Hawthorne, it's not crytek quality but it did look cool so check it out! and if you want to start making worlds like this or you want to learn more about game development, techniques or world editing head over to http://www.zepadev.net/ and check out the Geoworld API.
High Quality: http://www.zepastudios.com/sales/newdemo.wmv
Youtube:
