See e.g. the to_3d() function here: https://github.com/openscad/scad-utils/blob/master/transformations.scad#L43 -- View this message in context: http://forum.openscad.org/concatenate-2d-vektor-points-with-z-dimension-tp12087p12088.html Sent from the OpenSCAD mailing list archive at Nabble.com.