Mako/Models/Lights/Flares/RedLight-flare.xml

<?xml version="1.0" encoding="UTF-8"?>

<PropertyList>

  <path>RedLight-flat.ac</path>

  <animation>
    <type>blend</type>
    <expression>
      <sum>
        <product>
          <product>
            <property>lightpack/nav-lights-intensity</property>
            <value>-1</value>
          </product>
          <sum>
            <max>
              <product>
                <pow>
                  <cos><property>/sim/time/sun-angle-rad</property></cos>
                  <value>0.3</value>
                </pow>
                <value>0.8</value> <!-- by tuning this, you specify how much to fade during full daylight -->
              </product>
              <value>0</value>
            </max>
            <value>-1</value>
          </sum>
          <value>-1</value>
        </product>
        <value>1</value>
      </sum>
    </expression>
  </animation>

  <effect>
   <inherits-from>Effects/model-transparent</inherits-from>
   <condition>
    <property>/sim/rendering/rembrandt/enabled</property>
   </condition>
   <object-name>Light</object-name> 
  </effect>

  <animation>
    <type>noshadow</type>
    <object-name>Light</object-name>
  </animation>

  <animation>
    <type>alpha-test</type>
    <alpha-factor>0.01</alpha-factor>
  </animation>

  <animation>
    <type>billboard</type>
    <object-name>Light</object-name>
    <spherical type="bool">true</spherical>
  </animation>

  <animation>
    <type>material</type>
    <object-name>Light</object-name>
    <emission>
      <red>   1.0 </red>
      <green> 1.0 </green>
      <blue>  1.0 </blue>
    </emission>
  </animation>

  <animation>
    <type>dist-scale</type>
    <object-name>Light</object-name>
    <interpolation>
      <entry><ind>    0 </ind><dep> 0.25 </dep></entry>
      <entry><ind>   20 </ind><dep> 0.50 </dep></entry>
      <entry><ind> 1500 </ind><dep> 5.00 </dep></entry>
    </interpolation>
    <center> <!-- prevent the light from moving forward, obscuring eg. landing lights (the model is offset from center) -->
      <x-m>0</x-m>
      <y-m>-0.24</y-m>
      <z-m>0</z-m>
    </center>
  </animation>

</PropertyList>