So the final result I want is the volume can be cut by any closed tube and get the mask array to know the which voxels are inside the tube. -- View this message in context: http://vtk.1045678.n5.nabble.com/Cut-volume-with-freehand-curve-tp5600009p5602436.html Sent from the VTK - Users mailing list archive at Nabble.com.