Lauren Matthews

Hi, Can anyone help me extrude a pattern which I have made from polylines and arcs? I can compose it, but trying to join or convert, it won't allow. I have made sure that all the lines are connected. I've been using VW on and off for a year, but can't get my head around how to do this. I'm trying to build a 20mm thick metal screen, 2000mm high which has a pattern punctured in it. Many Thanks, Lauren