Hi, Andreas: I just read about the release og OpenCSG 1.0.0, which could be helpful for visualization of the result of CSG in the 3d views od KPM. http://www.opencsg.org/ Leon: I'm sorry, but I wasn't able to compile the CVS version of KPM, so I couldn't evaluate your landscape plugin. I'll give it another try next sunday. Cheers OlivS