kind of working but where did the euler layer go?

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

@@ -38,8 +38,8 @@ void SpawnPointCallback::Execute(vtkObject *caller, unsigned long evId, void *ca
     ren->SetDisplayPoint(displayPos);
     ren->DisplayToWorld();
     ren->GetWorldPoint(worldPos);
-    inverseCartographicProjection->MultiplyPoint(worldPos, worldPos);
-    // cout << "clicked on lon = " << worldPos[0] << " and lat = " << worldPos[1] << endl;
+    cout << "clicked on " << worldPos[1] << ", " << worldPos[0] << endl;
+    inverseCartographicProjection->TransformPoint(worldPos, worldPos);
 
     vtkIdType id = points->InsertNextPoint(worldPos[0], worldPos[1], 0);
     data->SetPoints(points);
@@ -77,6 +77,5 @@ void SpawnPointCallback::setRen(const vtkSmartPointer<vtkRenderer> &ren) {
 
 void SpawnPointCallback::setUVGrid(const std::shared_ptr<UVGrid> &uvGrid) {
   this->uvGrid = uvGrid;
-  inverseCartographicProjection = getCartographicTransformMatrix(uvGrid);
-  inverseCartographicProjection->Invert();
+  inverseCartographicProjection = createInverseCartographicTransformFilter(uvGrid)->GetTransform();
 }

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

@@ -1,13 +1,13 @@
 #ifndef SPAWNPOINTCALLBACK_H
 #define SPAWNPOINTCALLBACK_H
 
-
 #include <memory>
 #include <vtkCallbackCommand.h>
 #include <vtkRenderWindowInteractor.h>
 #include <vtkPoints.h>
 #include <vtkPolyData.h>
-#include <vtkMatrix4x4.h>
+#include <vtkAbstractTransform.h>
+
 #include "../advection/UVGrid.h"
 
 class SpawnPointCallback : public vtkCallbackCommand {
@@ -30,7 +30,7 @@ private:
   vtkSmartPointer<vtkPoints> points;
   vtkSmartPointer<vtkRenderer> ren;
   std::shared_ptr<UVGrid> uvGrid;
-  vtkSmartPointer<vtkMatrix4x4> inverseCartographicProjection;
+  vtkSmartPointer<vtkAbstractTransform> inverseCartographicProjection;
 
   void Execute(vtkObject *caller, unsigned long evId, void *callData) override;