Lets say I loaded two planes from vtkPlaneSource, they are defined by a center and a normal. How can I find the angle X,Y,Z between the two planes? -- View this message in context: http://vtk.1045678.n5.nabble.com/angle-between-planes-newbie-question-tp5737598.html Sent from the VTK - Users mailing list archive at Nabble.com.