Am 2017-03-09 09:21, also sprach clipka:
>
> I suspect what you're seeing isn't actually the wood grain, but a moiree
> pattern created by that wood grain and the pixel grid.

https://xkcd.com/1814/

It sure looks and acts like a moire.

But, but, but, why is it only an issue when I change the angle of the 
camera on the object, and not the distance.  And why do I only see this 
with woods at any scale and not stones or other fractals at any scale.

It seems odd.

 > What you would need to do is to enforce some stochastic oversampling,
 > for example by adding a bit of focal blur. Alternatively, you might want
 > to try UberPOV's anti-aliasing mode 3.

Focal blur is out of the question. UberPOV, hmmm...

-- 
dik

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