hi, i'm beginner dev.. In vtk 8.1.1 environment, vtkVolumeRayCastIsosurfaceFunction and vtkVolumeRayCastMapper are not available when using igstk. I know it was deleted in 8.1.1 Why it was removed and are there any other alternatives to using igstk? thanks for reading, :) -- Sent from: http://vtk.1045678.n5.nabble.com/VTK-Users-f1224199.html