Render or Model Problems

[Xhapan]

Hi community,
first of all, superb forum, found alot of usefull tutorials for sketchup. Thanks for that.
Second im new to Sketchup and have some troubles rendering a model i made. I dont exactly know if its the model that causes the problemes or if im just to stupid to use the VRay Render correctly.

Hopefully you will understand my explanations of the problems i have, because im german. ^^

The Chrome Effekt looks kind of nice, but there are some places where there is this sort of black shadow i dont like.
I have three light sources in the scene. The Right one is white and has an multiplier of 6, the left one is sort of orange and has an multiplier of 4 and the top is white an has an multiplier of 12. Or did i mess up the Vray Render Settings

The biggest problem is, that the wodden bottom of the chair looks totally messed up. on the right side of the wooden thing there are these brown "dots", the next uglier thing is left of the dots. This part looks like someone carves out some pieces of the wood. Then again the brown dots and the black triangle thing. Are these lightning an render problems or problems with the model ^^.

Hopefully you can help me ^^
Dominik

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[remus]

Could you post the model? or just one of the problem areas if the whole thing is too big. Theirs a chance theres some weird geometry making it go funny.