<terrain> Element (under <options>)

This section configures how the terrain engine will render image and elevation layers.

Sub-elements

<elevation_interpolation>	Sets the interpolation method to use when upsampling elevation tiles
<lighting>	Whether OpenGL lighting is enabled on the terrain surface. (default: true)
<loading_policy>	Controls how the terrain engine loads tiles.
<compositor>	Controls how the terrain engine composites image layers.
<max_lod>	Sets the maximum overall level of tile subdivision. (default: limited by available data)
<min_tile_range_factor>	Controls the camera distance at which new tiles will page in
<sample_ratio>	Sets the tile sample ratio to decrease/increase sampling resolution. (see osgTerrain) (default: 1.0)
<skirt_ratio>	Sets the ratio of tile skirt height to tile size (see osgTerrain)
<vertical_scale>	Sets the vertical scale factor for elevation grid points (default: 1.0)
<edge_buffer_ratio>	The ratio to expand the extent of a tile if the layer needs to be mosaiced or reprojected to ensure that enough data is retrieved to cover the entire tile. For instance, to expand the bounds by 2%, enter a value of 1.02.

Example

<map>
   <options>
      <terrain>
         <loading_policy mode="sequential" compile_threads="1"/>
         <compositor>multitexture</compositor>
         <lighting>false</lighting>
         ...
      </terrain>
      ...
   </options>

   ...
</map>

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