I'm using - vtkVolume with a vtkOpenGLGPUVolumeRayCastMapper mapper - vtkImageReslice for the slicing plane -- View this message in context: http://vtk.1045678.n5.nabble.com/vtkPicker-returned-actor-tp5736763p5736905.html Sent from the VTK - Users mailing list archive at Nabble.com.