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ALS technical notes: Difference between revisions
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→Rain
(→Rain) |
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Note the timing constant of the loop — running the update per-frame leads to a spurious movement of the coordinate system in which rain is rendered and spoils the effect. | Note the timing constant of the loop — running the update per-frame leads to a spurious movement of the coordinate system in which rain is rendered and spoils the effect. | ||
Another method when using JSBSIM would be to use a combination of FCS Functions and Filters | |||
<syntaxhighlight lang="xml"> | |||
<system name="c172p-glass-effects"> | |||
<channel name="rain"> | |||
<fcs_function name="glass-effects/splashx"> | |||
<function> | |||
<difference> | |||
<value>-0.1</value> | |||
<product> | |||
<value>2.0</value> | |||
<sqrt> | |||
<quotient> | |||
<min> | |||
<property>/velocities/airspeed-kt</property> | |||
<value>40</value> | |||
</min> | |||
<value>40</value> | |||
</quotient> | |||
</sqrt> | |||
</product> | |||
</difference> | |||
</function> | |||
</fcs_function> | |||
<fcs_function name="glass-effects/splashz"> | |||
<function> | |||
<difference> | |||
<value>1.0</value> | |||
<product> | |||
<value>1.35</value> | |||
<sqrt> | |||
<quotient> | |||
<min> | |||
<property>/velocities/airspeed-kt</property> | |||
<value>40</value> | |||
</min> | |||
<value>40</value> | |||
</quotient> | |||
</sqrt> | |||
</product> | |||
</difference> | |||
</function> | |||
</fcs_function> | |||
</channel> | |||
</system> | |||
</syntaxhighlight> | |||
<syntaxhighlight lang="xml"> | |||
<?xml version="1.0" encoding="UTF-8"?> | |||
<PropertyList> | |||
<filter> | |||
<name>splashX</name> | |||
<type>gain</type> | |||
<input> | |||
<property>/fdm/jsbsim/glass-effects/splashx</property> | |||
</input> | |||
<output> | |||
<property>/environment/aircraft-effects/splash-vector-x</property> | |||
</output> | |||
</filter> | |||
<filter> | |||
<name>splashY</name> | |||
<type>gain</type> | |||
<input> | |||
<value>0.0</value> | |||
</input> | |||
<output> | |||
<property>/environment/aircraft-effects/splash-vector-y</property> | |||
</output> | |||
</filter> | |||
<filter> | |||
<name>splashZ</name> | |||
<type>gain</type> | |||
<input> | |||
<property>/fdm/jsbsim/glass-effects/splashz</property> | |||
</input> | |||
<output> | |||
<property>/environment/aircraft-effects/splash-vector-z</property> | |||
</output> | |||
</filter> | |||
</PropertyList> | |||
</syntaxhighlight> | |||
You could reduce the above method to | |||
<syntaxhighlight lang="xml"> | |||
<?xml version="1.0"?> | |||
<system name="c172p-glass-effects"> | |||
<channel name="rain"> | |||
<fcs_function name="glass-effects/airspeed-clamped-sqrt"> | |||
<function> | |||
<sqrt> | |||
<quotient> | |||
<min> | |||
<property>/velocities/airspeed-kt</property> | |||
<value>40</value> | |||
</min> | |||
<value>40</value> | |||
</quotient> | |||
</sqrt> | |||
</function> | |||
</fcs_function> | |||
<fcs_function name="glass-effects/splashx"> | |||
<function> | |||
<difference> | |||
<value>-0.1</value> | |||
<product> | |||
<value>2.0</value> | |||
<property>/fdm/jsbsim/glass-effects/airspeed-clamped-sqrt</property> | |||
</product> | |||
</difference> | |||
</function> | |||
<output>/environment/aircraft-effects/splash-vector-x</output> | |||
</fcs_function> | |||
<fcs_function name="glass-effects/splashy"> | |||
<function> | |||
<value>0.0</value> | |||
</function> | |||
<output>/environment/aircraft-effects/splash-vector-y</output> | |||
</fcs_function> | |||
<fcs_function name="glass-effects/splashz"> | |||
<function> | |||
<difference> | |||
<value>1.0</value> | |||
<product> | |||
<value>1.35</value> | |||
<property>/fdm/jsbsim/glass-effects/airspeed-clamped-sqrt</property> | |||
</product> | |||
</difference> | |||
</function> | |||
<output>/environment/aircraft-effects/splash-vector-z</output> | |||
</fcs_function> | |||
</channel> | |||
</system> | |||
</syntaxhighlight> | |||
=== Frost and fogging === | === Frost and fogging === | ||