On 09/04/2015 07:33, And wrote:
> ... this is what I rendered.

That is the pattern I got when I used your original code. But something 
looks wrong with the shading and shadows. So I did a series of renders 
with a simpler material that is matt. I orbited the light around your 
shape and included a couple of primitives (two spheres and a lathe) 
using the same texture, for comparison. The Blue arrow points to the light.
Unless someone can explain it by the shape of the object. It looks like 
a bug to me.

Light orbiting horizontally
https://youtu.be/iOffuoxXjYo

Light orbiting horizontally at 45 deg
https://youtu.be/rz9dS-cCHAs

Light orbiting in vertical plane
https://youtu.be/X1EUq1VCXgY


-- 

Regards
     Stephen

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