<engine_properties> Element

This section configures how the runtime engine will display map layers.

Sub-elements

<combine_layers> In multi-texture mode, osgEarth applies default TexEnvCombine logic for blending together image layers. You can set this to false to override this and take complete control over blending. (default: true)
<elevation_interpolation> Sets the interpolation method to use when upsampling elevation tiles
<layering_technique> Controls the method osgEarth uses to composite image layers.
<lighting> Whether OpenGL lighting is enabled on the map. (default: true)
<loading_policy> Control over how the map engine loads tiles.
<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
<normalize_edges> Installs an update visitor to automatically stitch together adjacent tiles
<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)
<use_mercator_locator> Defaults to "true". Set to "false" to bypass the "mercator fast-path logic" that avoids the need to reproject spherical mercator imagery. Since this feature uses NPOT textures, set it to "false" if your gfx card does not support them. Disabling this feature may slow down tile loading speed since the engine will need to reproject imagery. (default: true)
<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>
   <engine_properties>
      <layering_technique>composite</layering_technique>
      <lighting>false</lighting>
      ...
   </engine_properties>

   <image ...>
       ...
   </image
</map>