The [[FlightGear]] [[scenery]] is displayed on the screen by rendering each of the triangles that makes up the surface with a texture, and placing random trees and objects on the surface. This Howto describes how to change the appearance of the scenery by modifying the texture, and configuring the objects that appear.
Each triangle has a defined "material", the landclass assigned to it by the scenery building process. The mapping of that material to a set of textures and objects is defined in the <tt>materials.xml</tt> file, found under the Materials/ directory.
Currently there are two sets of materials you can use - the default set ( defined in Materials/default/materials.xml), and a DDS set that takes advantage of pre-generated mipmaps of the dds texture format (defined in Materials/dds/materials.xml). Both of these make used of fragments of xml found under Materials/base/.
== Basic configuration ==