lCol same func as lGlyph

particle-track-and-trace/src/commands/SpawnPointCallback.cpp

@@ -51,8 +51,7 @@ void SpawnPointCallback::Execute(vtkObject *caller, unsigned long evId, void *ca
 }
 
 
-SpawnPointCallback::SpawnPointCallback() : data(nullptr),
-                                           points(nullptr),
+SpawnPointCallback::SpawnPointCallback() : points(nullptr),
                                            inverseCartographicProjection(nullptr),
                                            uvGrid(nullptr) { }
 
@@ -60,10 +59,6 @@ SpawnPointCallback *SpawnPointCallback::New() {
   return new SpawnPointCallback;
 }
 
-void SpawnPointCallback::setData(const vtkSmartPointer<vtkPolyData> &data) {
-  this->data = data;
-}
-
 void SpawnPointCallback::setPoints(const vtkSmartPointer<vtkPoints> &points) {
   this->points = points;
 }