hi, this is a new version of the GTU shader in CG format : GTUv050_CG.zip
the options can be modified by editing the “config.h” file, I didn’t include comments but you can use this standalone test application to see what each setting does : GTUv050test.tar.gz ( includes windows32 /ubuntu64 binaries and c++ source ).
you can tweak the settings with it and see the results in real time. you can also zoom in/out with the mouse : click to move / ctrl+click to zoom.