Animated Toon Material

Hello,

I have a problem animating a Toon object. I generated the material with a “Texture Coordinate” - “Dot Product” - “ColorRamp” and “Emission”. (see screenshot)



If you animate the object with the toon material, light and shadow move along like a texture. (see below)
[video]http://g-stalterei.de/blender/B100CS_problem.mp4[/video]

the Blendfile:
http://g-stalterei.de/blender/B100CS_problem.blend

Can I prevent this by animating the object from the “Texture Coordinate”? Or is there an easier way to generate a toon material in this look (just with lights and shadows)?

Thanks for your help!