Merge pull request #2550 from OpenSpace/feature/model-opacity

Feature/model opacity

include/openspace/rendering/renderable.h

@@ -66,8 +66,9 @@ public:
         Background = 1,
         Opaque = 2,
         PreDeferredTransparent = 4,
-        PostDeferredTransparent = 8,
-        Overlay = 16
+        Overlay = 8,
+        PostDeferredTransparent = 16,
+        Sticker = 32
     };
 
     static ghoul::mm_unique_ptr<Renderable> createFromDictionary(
@@ -133,6 +134,7 @@ protected:
     SceneGraphNode* parent() const noexcept;
 
     bool automaticallyUpdatesRenderBin() const noexcept;
+    bool hasOverrideRenderBin() const noexcept;
 
     RenderBin _renderBin = RenderBin::Opaque;
 
@@ -148,6 +150,7 @@ private:
     SceneGraphNode* _parent = nullptr;
     const bool _shouldUpdateIfDisabled = false;
     bool _automaticallyUpdateRenderBin = true;
+    bool _hasOverrideRenderBin = false;
 
     // We only want the SceneGraphNode to be able manipulate the parent, so we don't want
     // to provide a set method for this. Otherwise, anyone might mess around with our