As promised I implemented cascaded shadow maps in my game:
The game now renders multiple shadow maps with different resolution. There is a smooth transition between the different shadow maps.
The low framerate comes only from the video recording software. Ah, and I accidently toasted the sky! But I am working on a better one now.
You can download the current version of the software via:
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Very nice so far, but dear lord kill those birds
Looks really good. :)