I love World Creator, especially the vegetation distribution pipeline. You can create some very realistic fields with it. Im going to check out impostors too - ive seen it a few times and wondered what it's about.
Stupid Rental. My Zbrush that I haven't paid for an update in years and is perpetual Trumps that on all counts.
CRYENGINE: Layer Streaming
Learn how to layer streams in this CryEngine Tutorial. It demonstrates how to properly set up them to up to make them work in launcher and editor.
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