seachnasaigh I tried to copy your 2 math functions, I never got it right. 

Thanks for your alls replies and help ,but I don't get the material room very well. I need to learn it a lot better.

But you can get a mesh with a polycount of 1,400 with a bump map to look just as good as the same mesh with a polycount of 22,400 ,  right ?

I never got if Poser Pro 14 or Poser GameDev has normal maps ?

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