Harald JOHNSEN:

This is another update for the cloud code, a lot of lines but this time I have started to add the doxygen doc.

Misc
====

- corrected a bug when RTT is not available, the current rendering context was
  altered
- if RTT is not available then 3d clouds are not drawn at all
- impostors lighting is now recomputed when the sun changes position
- distant objects are no more seen in front of clouds
- blending of distant clouds is a bit better now
- litle optimization of code (uses a less cpu time)
- use layer wind speed and direction (no more hardcoded wind)
- fov is no more hardcoded

Changes
=======

- clouds (cu only) are dissipating/reforming (experimental)
- compute a turbulence factor that depends on surrounding clouds and type of
  clouds (experimental)
- clouds shapes are defined in cloudlayers.xml
- type of clouds present in a layer is also defined in cloudlayers.xml
- cloud layers are generated from metar and other misc. data (in progress)
- added a rain effect around the viewer (enabled in the rendering dialog and
  when the metar property says so)
- added a lightning effect (enabled in the rendering dialog) : cb clouds spawn
  new lightnings
- added a dialog to select from different weather source : metar/property,
  a 'fair weather' environment and a 'thunderstorm' environment.

gui/dialogs/rendering.xml

@@ -58,6 +58,24 @@
       </binding>
     </checkbox>
 
+    <checkbox>
+      <halign>left</halign>
+      <label>Precipitations</label>
+      <property>/sim/rendering/precipitation-enable</property>
+      <binding>
+        <command>dialog-apply</command>
+      </binding>
+    </checkbox>
+
+    <checkbox>
+      <halign>left</halign>
+      <label>Lightnings</label>
+      <property>/sim/rendering/lightning-enable</property>
+      <binding>
+        <command>dialog-apply</command>
+      </binding>
+    </checkbox>
+
     <checkbox>
       <halign>left</halign>
       <label>Bump mapped clouds</label>
@@ -77,7 +95,6 @@
     </checkbox>
   </group>
 
-
   <group>
     <layout>hbox</layout>
     <halign>right</halign>

gui/dialogs/weather_scenario.xml

@@ -0,0 +1,67 @@
+<?xml version="1.0"?>
+
+<PropertyList>
+  <name>weather_scenario</name>
+  <modal>false</modal>
+  <layout>vbox</layout>
+
+  <text>
+    <label>___________Weather Scenario___________</label>
+  </text>
+
+  <text>
+    <label></label>
+  </text>
+  <group>
+    <layout>hbox</layout>
+    <text>
+      <label>Weather source</label>
+      <halign>left</halign>
+    </text>
+    <combo>
+      <pref-width>200</pref-width>
+      <property>/environment/weather-scenario</property>
+      <value>Fair weather</value>
+      <value>Thunderstorm</value>
+      <value>METAR</value>
+      <binding>
+        <command>dialog-apply</command>
+      </binding>
+      <binding>
+        <command>nasal</command>
+        <script>
+          setprop("/environment/rebuild_layers", getprop("/environment/rebuild_layers")+1);
+        </script>
+      </binding>
+    </combo>
+  </group>
+
+  <text><label>Last metar used</label></text>
+  <input>
+    <pref-width>400</pref-width>
+    <live>true</live>
+    <property>/environment/metar/last-metar</property>
+  </input>
+
+  <text>
+    <label></label>
+  </text>
+
+  <group>
+    <layout>hbox</layout>
+    <empty><stretch>true</stretch></empty>
+
+    <button>
+      <legend>Close</legend>
+      <binding>
+        <command>dialog-apply</command>
+      </binding>
+      <binding>
+        <command>dialog-close</command>
+      </binding>
+      <default>true</default>
+    </button>
+
+    <empty><stretch>true</stretch></empty>
+  </group>
+</PropertyList>

gui/menubar.xml

@@ -248,6 +248,14 @@
  <menu>
   <label>Weather</label>
 
+  <item>
+   <label>Weather Scenario</label>
+   <binding>
+    <command>dialog-show</command>
+    <dialog-name>weather_scenario</dialog-name>
+   </binding>
+  </item>
+
   <item>
    <label>Weather Conditions</label>
    <binding>

preferences.xml

@@ -348,6 +348,8 @@ Started September 2000 by David Megginson, david@megginson.com
  <environment>
   <config>
 
+   <cloudlayers include="cloudlayers.xml"/>
+
    <boundary-transition-ft>500</boundary-transition-ft>
 
    <boundary>