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Document <float-property> and /sim/rendering/quality-level

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fredb 2010-04-10 14:09:49 +00:00
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Docs/README.effects
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@ -35,6 +35,7 @@ and, or, equal, less, less-equal
glversion - returns the version number of OpenGL
extension-supported - returns true if an OpenGL extension is supported
property - returns the boolean value of a property
float-property - returns the float value of a property, useful inside equal, less or less-equal nodes
shader-language - returns the version of GLSL supported, or 0 if there is none.
The proper way to test whether to enable a shader-based technique is:
@ -48,6 +49,23 @@ The proper way to test whether to enable a shader-based technique is:
</and>
</predicate>
There is also a property set by the user to indicate what is the level
of quality desired. This level of quality can be checked in the predicate
like this :
<predicate>
<and>
<property>/sim/rendering/shader-effects</property>
<less-equal>
<value type="float">2.0</value>
<float-property>/sim/rendering/quality-level</float-property>
</less-equal>
<!-- other predicate conditions -->
</and>
</predicate>
The range of /sim/rendering/quality-level is [0..5]
* 2.0 is the threshold for relief mapping effects,
* 4.0 is the threshold for geometry shader usage.
A technique can consist of several passes. A pass is basically an Open
Scene Graph StateSet. Ultimately all OpenGL and OSG modes and state