Great, thank you. It workes as expected (typo, Section 2.4.9.7).

I asked for backface culling because i'm using a mesh. The general case  
could be called back pigment culling or something like that. Two sided  
textures would be nice, too, because if i want the backside of the roof to  
be semitransparent, i have to pass the no_image flag either to the  
frontside or the backside depending on what side is visible. It is  
possible in my roof example, but for more complex meshes or even csg  
objects it can be quite difficult to achieve that result.

>> Is there a possibility to enable backface-culling relative to some
>> vector   (in my case the eyevector)? So i could look through the roof
>
> No, backface culling is for polygon scan-conversion only. The effect you
> want can be achieved by adding the "no_image" keyword to the roof
> object. This lets you see through the roof but it will still cast
> shadows (unless no_shadow is also used) and will still appear in
> reflections (unless no_reflection is also used). Section 3.4.9.7 of the
> manual describes it further.
>
> Daniel

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