Hi Given a 2D coordinate (x,y) , how to get all 3D points on the polygon surfaces whose 2D projection point equals (x,y)? Thanks superZZ -- View this message in context: http://vtk.1045678.n5.nabble.com/Pick-points-on-all-polygon-surfaces-tp4262431p4262431.html Sent from the VTK - Users mailing list archive at Nabble.com.