vtkPropPicker does not report correct GetPickPosition when using PickList
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
vtkPropPicker uses the WorldPointPicker to find the pick location returned by GetPickPosition. However, if a pick list is used to select from a subset of actors in the scene, vtkPropPicker::GetPickPosition will return the hit point of any actor in the currently rendered scene. vtkWorldPointPicker uses vtkRenderer::GetZ(...) in it's Pick method, while vtkPropPicker should use vtkViewport::GetPickedZ() to get the Z location of the picked point, not the Z value of any rendered geometry in the current scene.