Clean up use of transforms in scene graph.

src/rendering/visual_elements/nodes/GridNode.h

@@ -3,11 +3,12 @@
 #include "MaterialNode.h"
 #include "Color.h"
 
+class SceneModel;
+
 class GridNode : public MaterialNode
 {
-
 public:
-    GridNode(const Point& location);
+    GridNode(const Transform& transform);
 
     void setNumX(std::size_t numX);
 
@@ -28,7 +29,10 @@ private:
     std::size_t mNumberY{5};
     double mWidth{1};
     double mHeight{1};
+
     bool mDataDirty = true;
+    bool mGeometryIsDirty = true;
+
     std::vector<Color> mData;
 
     std::unique_ptr<SceneModel> mBackgroundModel;