Is there any way to get rid of such little uglinesses? http://i62.tinypic.com/mhd7rm.jpg

You may notice them at the center of the image, above green orb. I use ugridDistantCount=5 I belive if that matters.

Oh, and I use PK LandscapeLOD Color for landscape color maps, but that seem to be render further than those little polygon shapes.