A thesis about real-time realistic rendering of nature scenes with dynamic lighting has been published. This thesis includes all details about real-time grass rendering and about real-time tree rendering with indirect lighting.
You can grab the thesis here: PhD thesis
It’s a pity there is no real-time 3D demo. Screenshots are cool but a real demo is better!
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Following a link from the author’s website (http://www.kevinboulanger.net/), the following page has videos of his grass and tree renderings: http://www.neptune3d.net/screenshots.html.
Thanks for the post/link to the thesis too.
Thanks for this addition!