Polygons acting up

[trixxr]

Hi!
I'm trying to create the mastersword from The Legend of Zelda - and as I'm progressing, I meet a problem I've experienced before (which happens too often by now, to just ignore it!)
 Why does it seem like the flat polygon box, isn't at the same level as the others? The mesh looks clear, but the render looks like this? I bet It's some common newbie problem, so i really hope there's someone who can explain why it's messing with me!

Cheers in advance  

[giacinti]

Provided your geometry is correct, it's an issuse with the surface normal, and can be fixed by normal -set to face or manually setting the normal angle.  This can happen from a number of things, but booleans (subtract, intersect, etc) can do this.

Hope this helps