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MP
==
The default terrain engine for osgEarth renders an unlimited number of
image layers using a tile-level multipass blending technique.
Example usage::
<map>
<options>
<terrain driver = "mp"
skirt_ratio = "0.05"
color = "#ffffffff"
normalize_edges = "false"
incremental_update = "false"
quick_release_gl_objects = "true"
min_tile_range_factor = "6.0"
cluster_culling = "true" />
Properties:
:skirt_ratio: The "skirt" is a piece of vertical geometry that hides
gaps between adjacent tiles with different levels of
detail. This property sets the ratio of skirt height to
the width of the tile.
:color: Color of the underlying terrain (without imagery) in
HTML format. Default = "#ffffffff" (opaque white). You
can adjust the alpha to get transparency.
:normalize_edges: Post-process the normal vectors on tile boundaries to
smooth them across tiles, making the tile boundaries
less visible when not using imagery.
:incremental_update: When enabled, only visible tiles update when the map
model changes (i.e., when layers are added or removed).
Non-visible terrain tiles (like those at lower LODs)
don't update until they come into view.
:quick_release_gl_objects: When true, installs a module that releases GL resources
immediately when a tile pages out. This can prevent
memory run-up when traversing a paged terrain at high
speed. Disabling quick-release may help achieve a more
consistent frame rate.
.. include:: terrain_options_shared.rst
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