i tried your shader, i can't seem to get any real effect out of it otehr then reduction in frame rate.

I used the photoshop nvidia plug in to generate a normal map

from the normal standard wad texture assigned that to entskin1

and the normal map assigned that to entskin2


then assigned the material to a map entity I textured with the stone texture ( block on the right side) block wall behind it textured with same texture for compairison



do they both need to be the same format? tga bmp ?
do I need to crop the normal map or is my normal map not normalized enough?

sorry i don't know realy anything on shaders but i didn't notice any differance