Don't attempt to render weather particles on the refraction and reflection textures

apps/openmw/mwrender/sky.cpp

@@ -1374,6 +1374,7 @@ void SkyManager::createRain()
     mRainFader = new RainFader;
     mRainNode->addUpdateCallback(mRainFader);
     mRainNode->addCullCallback(mUnderwaterSwitch);
+    mRainNode->setNodeMask(Mask_WeatherParticles);
 
     mRootNode->addChild(mRainNode);
 }
@@ -1515,6 +1516,7 @@ void SkyManager::setWeather(const WeatherResult& weather)
             {
                 mParticleNode = new osg::PositionAttitudeTransform;
                 mParticleNode->addCullCallback(mUnderwaterSwitch);
+                mParticleNode->setNodeMask(Mask_WeatherParticles);
                 mRootNode->addChild(mParticleNode);
             }
             mParticleEffect = mSceneManager->createInstance(mCurrentParticleEffect, mParticleNode);

apps/openmw/mwrender/vismask.hpp

@@ -15,21 +15,26 @@ namespace MWRender
         Mask_Actor = (1<<3),
         Mask_Player = (1<<4),
         Mask_Sky = (1<<5),
-        Mask_Sun = (1<<6),
-        Mask_Water = (1<<7),
-        Mask_SimpleWater = (1<<8),
-        Mask_Terrain = (1<<9),
-        Mask_FirstPerson = (1<<10),
+        Mask_Water = (1<<6),
+        Mask_Terrain = (1<<7),
+        Mask_FirstPerson = (1<<8),
+
+        // child of Sky
+        Mask_Sun = (1<<9),
+        Mask_WeatherParticles = (1<<10),
+
+        // child of Water
+        Mask_SimpleWater = (1<<11),
 
         // top level masks
-        Mask_Scene = (1<<11),
-        Mask_GUI = (1<<12),
+        Mask_Scene = (1<<12),
+        Mask_GUI = (1<<13),
 
         // Set on a Geode
-        Mask_ParticleSystem = (1<<13),
+        Mask_ParticleSystem = (1<<14),
 
         // Set on cameras within the main scene graph
-        Mask_RenderToTexture = (1<<14)
+        Mask_RenderToTexture = (1<<15)
 
         // reserved: (1<<16) for SceneUtil::Mask_Lit
     };