[dataflow][rendering] allow to edit graphs from rendering controller.

Author: MathiasPaulin

src/Dataflow/Rendering/Renderer/RenderGraphController.hpp

@@ -50,6 +50,9 @@ class RA_DATAFLOW_API RenderGraphController : public ControllableRenderer::Rende
     /// Call this to set a graph to load before OpenGL is OK
     void deferredLoadGraph( const std::string& filename );
 
+    // allow to "edit" the graph
+    RenderingGraph* getGraph() { return m_renderGraph.get(); }
+
   protected:
     /// The controlled graph.
     /// The controller own the graph and manage loading/saving of the renderer