Cascaded shadow maps in the Alien Swarm engine

[Kave]

Sam za Nemesis and I have created a technique that allows us to have full dynamic sunlighting with dynamic shadows support in the Alien Swarm engine, We have also replaced the standard grainy shadow technique developed by Jason Mitchell, instead we're using the technique used in Portal 2.
It's not ready for release yet, as we have to nail down a couple of things, It would be easier if Valve released the shader sources for the Alien Swarm engine, here are some screenshots of what we have so far, expect a video soon.

http://img840.imageshack.us/img840/4...1120200016.jpg
http://img268.imageshack.us/img268/4...1120200018.jpg
http://img843.imageshack.us/img843/3...1120300002.jpg
http://img190.imageshack.us/img190/1...1120300003.jpg
http://img546.imageshack.us/img546/2...1120300006.jpg
http://img832.imageshack.us/img832/4...1120300007.jpg

Also JLea created the GUI which allows mappers to preview their lighting settings on the fly.
Mappers need only tweak their indoor lights and basic ambience.

here is a video: http://youtu.be/X6OwBWkmspc

If you don't know what is cascaded shadow maps, please follow this link:
http://developer.download.nvidia.com...hadow_maps.pdf