[TDR]

I made this scene and made a test render with no textures, and I was surprised to notice that the toilet is rendered realy wierd. As you notice, there's a big black spot on it. I tried another material and lighting setup, but still the same. The mesh has no unwelded or scrambled vertices. Here are the renders (all at sampling level 7 or 8 ):

flash light-like render, toilet uses a white maxwell diffuse shader


same set-up as above, toilet uses maxwell plastic shader


same plastic shader, physical sky & sun


wireframe


almost the same thing happened in another render:


What may be the cause of this problem and how can I fix it? Any help would be very appreciated.

Oh, forgot to mention that I use 3ds max 8 (rendered with max plugin, not from the maxwell studio) and Maxwell RC5.

Edit: also, the scale is set fine.

[samsam]

Suggestion - you may have already done this but perhaps look to see if your poly normals are correctly oriented.

[TDR]

The normals are all aranged fine:
http://i25.photobucket.com/albums/c87/m ... ormals.jpg

Here's another pic, from the other side. Same white maxwell diffuse shader.


In the first pics, I modeled one half and then mirrored it, attached it to the other half and welded the middle vertices. In the above pic, I used the symetry modifier on one half, but still the same result.

Edit: here's a quick render with mental ray. as you can see, everything's fine. why maxwell renders it nasty?