well, after some rest, I am not rly sure my thing actually does anything good
those zero divide errors maybe just make the shader bypass the blur and any better feeling is achieved with texture filtering settings
A different approach with post processed textures (.dds) and a contour filter would give better results
I dont rly like cartoon rendering, it reminds me old bad experiences at work as I have been working on some TV cartoon serie made in 3D with cartoon post processes, and that was a predicted total fail.
But I have a passion for post processing since forever, and noise as the primordial soup from wich harmony emerges.
I may have another try at it. sorry for the noise.