Fading

When fading is supported on a model layer, you can control it like so:

<model ...
    <fading duration  = "1.0"
            max_range = "6000"
            attenuation_distance = "1000" />

Properties:

duration:Time over which to fade in (seconds)
max_range:Distance at which to start the fade-in
attenuation_distance:
 Distance over which to fade in

Shader Policy

Some drivers support a shader policy that lets you control how (or whether) to generate shaders for external geometry. For example, if you want to load an external model via a stylesheet, but do NOT want osgEarth to generate shaders for it:

<model ...
    <shader_policy>disable</shader_policy>