This is the first version where I hatched only shadow part. Color still using hue provided via cycles, 2 view maps so the render time was long (long by npr standard that is)
Skip version 2, this is version 3. Hatching whole body. 1 view map so the render time is lowered by 30%.
Version 4, this version adds rim highlight. And you might be wondering how that hatching is done. Very simple.
The formula is… shockingly easy.
You can download Iron man model at http://www.blendswap.com/blends/view/68116 CC-BY-SA. Show me what you can make with the node setup (but not copying for the same result on the same model). Eagerly waiting for your renders.
PS: Get FreeStyle course at https://blendernpr.org/store/ and support BEER Development to enhance Blender Internal Renderer.