yeah. i want the output volume where the values inside the cut area set to the same value so that I can use the volume raycast to show this area on the screen. -- View this message in context: http://vtk.1045678.n5.nabble.com/Cut-volume-with-freehand-curve-tp5600009p5602403.html Sent from the VTK - Users mailing list archive at Nabble.com.