Am 14.02.2012 08:53, schrieb Thomas de Groot:
> On 14-2-2012 1:13, clipka wrote:
>> Am 13.02.2012 13:25, schrieb Thomas de Groot:
>>
>>> I am still not sure about whether the bump sizes should be positive or
>>> negative. I find positive values looking better in general but that
>>> might be a wrong approach.
>>
>> Don't worry about it: You can't get it right anyway, due to a known
>> problem with POV-Ray's implementation of UV-mapped image-based bump
>> maps. Unfortunately, fixing it isn't exactly trivial.
>
> Ah? Interesting to hear this. I hope (I know!) you will find a solution.

I'm currently looking into this once again. Seems like there are 
actually two more-or-less independent design flaws contributing to this, 
one of which affects even non-UV-mapped bump maps.

And then tnere's another one, that has gone unnoticed so far: Did you 
know that if you use a low-resolution bump map for testing, you'll get 
stronger bumps than in the final render?

This also means that if I sort out all the problems, I'm guaranteed to 
break each and every existing scene that uses bump maps. Yuck!

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