I am using now vtkTriangle::TrianglesIntersect() method. Link to the source code: https://pastebin.com/7bi1UHtN Maybe it's something wrong with my code. -- View this message in context: http://vtk.1045678.n5.nabble.com/triangle-triangle-intersection-VTK-C-tp5744096p5744104.html Sent from the VTK - Users mailing list archive at Nabble.com.