added new option to modulate brightness for LGlyphLayer

particle-track-and-trace/src/layers/LGlyphLayer.h

@@ -4,6 +4,7 @@
 #include "Layer.h"
 #include "../advection/kernel/AdvectionKernel.h"
 #include "../commands/SpawnPointCallback.h"
+#include <queue>
 #include <vtkPolyData.h>
 #include <vtkInteractorStyle.h>
 
@@ -16,10 +17,12 @@ private:
   vtkSmartPointer<vtkPolyData> data;
   vtkSmartPointer<vtkIntArray> particlesBeached;
   vtkSmartPointer<vtkIntArray> particlesAge;
+  vtkSmartPointer<vtkPolyDataMapper> mapper;
   std::unique_ptr<AdvectionKernel> advector;
   std::shared_ptr<UVGrid> uvGrid;
   int dt = 3600;
   int beachedAtNumberOfTimes = 20;
+  std::queue<vtkSmartPointer<vtkLookupTable>> luts;
 
 public:
   /** Constructor.
@@ -41,6 +44,9 @@ public:
 
   void addObservers(vtkSmartPointer<vtkRenderWindowInteractor> interactor) override;
 
+  /** This function cycles which lut is used for the layer, according to the lookuptables in the luts attribute.
+   */
+  void cycleGlyphStyle();
 
   /** 
    * Sets a custom DT value, needed for advect calls to the simulation logic.