Pull weather updates out of scene render

--HG--
branch : multipass-stereo

code/ryzom/client/src/main_loop.cpp

@@ -550,10 +550,9 @@ void renderScene(bool forceFullDetail, bool bloom)
 }
 
 // ***************************************************************************************************************************
-// Render all scenes
-void renderScene()
+
+void updateWeather()
 {
-	{
 	H_AUTO_USE ( RZ_Client_Main_Loop_Sky_And_Weather )
 
 	//HeightGrid.update(Scene->getCam().getPos());
@@ -581,13 +580,11 @@ void renderScene()
 	}
 	#endif
 	
-
 	ContinentMngr.getFogState(MainFog, LightCycleManager.getLightLevel(), LightCycleManager.getLightDesc().DuskRatio, LightCycleManager.getState(), View.viewPos(), MainFogState);
 
-		if (Driver->getPolygonMode() == UDriver::Filled)
-		{
-			Driver->clearZBuffer();
-		}
+	// TODO: ZBuffer clear was originally before this, but should not be necessary normally.
+	// The anim function renders new clouds. Ensure this does not break.
+	// These are old-style nel clouds.
 
 	#ifdef RENDER_CLOUDS
 	if (CloudScape != NULL && Filter3D[FilterCloud])
@@ -608,6 +605,17 @@ void renderScene()
 		Driver->setPolygonMode(oldMode);
 	}
 	#endif
+}
+
+// ***************************************************************************************************************************
+// Render all scenes
+void renderScene()
+{
+	if (Driver->getPolygonMode() == UDriver::Filled)
+	{
+		Driver->clearZBuffer();
+	}
+
 	// Sky is used to clear the frame buffer now, but if in line or point polygon mode, we should draw it
 	if (Driver->getPolygonMode() != UDriver::Filled)
 	{
@@ -616,7 +624,7 @@ void renderScene()
 			Driver->clearBuffers (CRGBA(127, 127, 127));
 		}
 	}
-	}
+
 	// Update Filter Flags
 	Scene->enableElementRender(UScene::FilterAllMeshNoVP, Filter3D[FilterMeshNoVP]);
 	Scene->enableElementRender(UScene::FilterAllMeshVP, Filter3D[FilterMeshVP]);
@@ -1542,6 +1550,9 @@ bool mainLoop()
 				}
 				#endif
 				
+				// TODO: Verify that moving this out of renderScene does not negatively impact oversize screenshots.
+				updateWeather();
+
 				if (ClientCfg.Bloom)
 				{
 					// set bloom parameters before applying bloom effect