Use default zone's fog color to fill background when no viewports.

Expose default zone to script.

Bin/Data/Scripts/Chat.as

@@ -76,6 +76,9 @@ void InitUI()
     startServerButton = AddUIButton("Start Server", 110);
 
     chatHistory.Resize((graphics.height - 20) / chatHistoryText.rowHeight);
+    
+    // No viewports or scene is defined. However, the default zone's fog color controls the fill color
+    renderer.defaultZone.fogColor = Color(0, 0, 0.1);
 }
 
 Button@ AddUIButton(const String& text, int width)

Engine/Engine/GraphicsAPI.cpp

@@ -1042,6 +1042,7 @@ static void RegisterRenderer(asIScriptEngine* engine)
     engine->RegisterObjectMethod("Renderer", "void SetDefaultRenderPath(XMLFile@+)", asMETHODPR(Renderer, SetDefaultRenderPath, (XMLFile*), void), asCALL_THISCALL);
     engine->RegisterObjectMethod("Renderer", "void set_defaultRenderPath(RenderPath@+)", asMETHODPR(Renderer, SetDefaultRenderPath, (RenderPath*), void), asCALL_THISCALL);
     engine->RegisterObjectMethod("Renderer", "RenderPath@+ get_defaultRenderPath() const", asMETHOD(Renderer, GetDefaultRenderPath), asCALL_THISCALL);
+    engine->RegisterObjectMethod("Renderer", "Zone@+ get_defaultZone() const", asMETHOD(Renderer, GetDefaultZone), asCALL_THISCALL);
     engine->RegisterObjectMethod("Renderer", "void set_specularLighting(bool)", asMETHOD(Renderer, SetSpecularLighting), asCALL_THISCALL);
     engine->RegisterObjectMethod("Renderer", "bool get_specularLighting() const", asMETHOD(Renderer, GetSpecularLighting), asCALL_THISCALL);
     engine->RegisterObjectMethod("Renderer", "void set_textureAnisotropy(int)", asMETHOD(Renderer, SetTextureAnisotropy), asCALL_THISCALL);

Engine/Graphics/Renderer.cpp

@@ -658,7 +658,7 @@ void Renderer::Render()
         graphics_->SetScissorTest(false);
         graphics_->SetStencilTest(false);
         graphics_->ResetRenderTargets();
-        graphics_->Clear(CLEAR_COLOR | CLEAR_DEPTH | CLEAR_STENCIL);
+        graphics_->Clear(CLEAR_COLOR | CLEAR_DEPTH | CLEAR_STENCIL, defaultZone_->GetFogColor());
         
         numPrimitives_ = 0;
         numBatches_ = 0;