thanks. the terrain is really not special. I use normally 128x128 quants as triangle size (the larger the faster ; the smaller the better resolution), 32 as chunk size (default), and the total terrain size is also the multiple of chunk size as described in the manual. there are a few terrains included in this package in different sizes, some of them have 1 large skin + a small detail skin, or tiled skins using a slightly modified (mirror effect compatible) terraintex.fx fixed function effect. no magic