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Some words from my tiny little experience on clay renders with Blender & Yafray :
- Use a specific material for all your parts : no reflection, color as you like (mine : #D6C796 for diffuse and specular, mirror color useless because no reflection), lambert shader for diffuse (0.690), CookTorr shader for spec (spec 1.135, hard 8 )
- Common scene setup : either white sky, or black sky and one biiiiig horizontal white plane (emit 1.0) above the car to light the scene.
- GI with Yafray : Full method (SkyDome is useless if you use a white plane, of course : so keep it for white sky and faster results), AA (aka OSA in Blender) to 16.
Needs some time to render (roughly, the same than realistic renders need) but it worth it.
I hope it will be useful. I stay tuned for any question.
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