I am currently improving the shaders to make them not only faster but also to get rid of some aliasing and movement caused in the shader.

This is how it looks with three 256*256 depthmaps:


Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en)
Shader Tutorial (ger)

http://www.slindev.com