hi there,
Its there any posibility to reduce polygons? I tried Polyreduce plugin, which is on forum, but it doesnt work well. And my second question is about performance. I am using iMac, 2.66ghz, 4gb ram, nv9400. On this platform take generating of 150x150px height map around 4. minutes. Can you recomend something to speed it up?

Actually, this is not tuturial, but it should be usefull. http://www.frecle.net/index.php?show=treed.about . Its realy simple tree generator.