<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Times New Roman; font-size: 12pt; color: #000000'><br><br><hr id="zwchr"><blockquote style="border-left:2px solid rgb(16, 16, 255);margin-left:5px;padding-left:5px;"><br>Hi,<br><br>If I have a 2D rectangular mesh which is periodic in one direction, lets <br>say the j direction, then the leftmost and rightmost edge of the mesh <br>are really the same edge. Do they both need to be declared in MOAB? Or <br>does the periodic property mean you only need to describe one of the <br>edges and the other end will know its adjacent to it?<br><br>Thanks,<br>Rob<br></blockquote>Hi,<br>I assume that you use ScdInterface; <br>If the box is periodic in j direction, the nodes in that direction will be "periodic". <br>Nodes are not duplicated, the edges that you get on the leftmost and rightmost sides are really pointing to the same nodes, they will not be duplicated, either.<br><br>How do you get edges after you create quads?<br>You can use "get_adjacency" methods, with "create_if_missing" flag true. Only one edge would be created.<br>The problem is that the order in which these are created is not very "structured"<br> Or do you create them with new scd boxes, of dimension 1, in a loop over i (and then j?)? In that case, you have complete control over "order" they are created in.<br>I hope this helps.<br>Iulian<br><br><br>Iulian<br></div></body></html>