Layers and Their Values

Layers define the order in which Flight Simulator applies the textured
polygons to the ground and in which phase of the texture building process
they are applied.

Layers 0 to 3 are applied in the water texture layer. These are applied
before the water texture is masked into the land texture. These polygons
appear only in the water and are clipped by the land portion of a texture.

Layers 4 to 7 are in the land texture layer. These textures are applied
to the land texture before the water texture is masked in. Polygons used
at these levels appear on the land texture but are clipped by the water
portions. For this reason, airport skirtings and park polygons were placed
in layer 4.

Layers 8 and above (the number of layers is capped at 100) are applied
to the texture after the land and water are masked together. Polygons
applied at this level appear over both the land and water portions of
the texture. Shoreline polygons were placed at level 8 to provide a
blending effect between the land and the water.

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Type of Data            LayerID
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Water Texture            0 - 3
Land  Texture            4 - 7
General                  8 - 100
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Values used in FS2002
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Type of Data            LayerID
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Airport Skirtings         4
and Parks

Shorelines                8

Streams                   16

Dirt and Minor Roads      31

Major Roads               32
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