-Parte 1:
http://www.3dtotal.com/tutorial/zbrush/creating_rock_arch_for_game_engines/part_01/rock_texture_unreal_part1_01.php
-Parte 2: (lo introduce en UDK)
http://www.3dtotal.com/tutorial/zbrush/creating_rock_arch_for_game_engines/part_02/rock_texture_unreal_part2_01.php