Revert "more accurate fog, TODO: apply this to the terrain"

This reverts commit 96c37d3e7c.

apps/openmw/mwworld/weather.cpp

@@ -334,11 +334,8 @@ WeatherManager::WeatherManager(MWRender::RenderingManager* rendering, MWWorld::E
 
 void WeatherManager::setWeather(const String& weather, bool instant)
 {
-    if (weather == mCurrentWeather && mNextWeather == "")
-    {
-        mFirstUpdate = false;
+    if (weather == mCurrentWeather && mNextWeather == "") 
         return;
-    }
 
     if (instant || mFirstUpdate)
     {

components/nifogre/ogre_nif_loader.cpp

@@ -328,7 +328,6 @@ void NIFLoader::createMaterial(const String &name,
             "   out float4 oNormal : TEXCOORD2, \n"
             "   out float oDepth : TEXCOORD3, \n"
             "   out float4 oVertexColour : TEXCOORD4, \n"
-            "   uniform float4 cameraPosObjSpace, \n"
             "	uniform float4x4 worldViewProj	\n"
             ")	\n"
             "{	\n"
@@ -336,13 +335,12 @@ void NIFLoader::createMaterial(const String &name,
             "   oUV = uv; \n"
             "   oNormal = normal; \n"
             "	oPosition = mul( worldViewProj, position );  \n"
-            "   oDepth = length(position.xyz - cameraPosObjSpace.xyz); \n"
+            "   oDepth = oPosition.z; \n"
             "   oPositionObjSpace = position; \n"
             "}";
             vertex->setSource(outStream.str());
             vertex->load();
             vertex->getDefaultParameters()->setNamedAutoConstant("worldViewProj", GpuProgramParameters::ACT_WORLDVIEWPROJ_MATRIX);
-            vertex->getDefaultParameters()->setNamedAutoConstant("cameraPosObjSpace", GpuProgramParameters::ACT_CAMERA_POSITION_OBJECT_SPACE);
         }
         else
             vertex = mgr.getByName("main_vp");