You should look at Terrain : http://udn.epicgames.com/Three/TerrainDesign.html Heightmap Triangles File Size 64x64 8,192 125kb 128x128 32,768 3.2MB 256x256 131,072 7.2MB 512x512 524,288 28.7MB 1024x1024 2,097,152 110MBhow You see 1024*1024 heightmap is making already 2 milions triangles ! I suppose that that's the limit of…