<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><br class=""><br class=""><blockquote type="cite" class="">On 16 Oct 2018, at 17:03, Wang Bin <<a href="mailto:binwang.0213@gmail.com" class="">binwang.0213@gmail.com</a>> wrote:<br class=""><br class="">Dear Developers,<br class=""><br class="">Thanks for the nice mesh generator. Now I'm trying to use BooleanFragments in OpenCASCADE engine to mesh some "compsolid" model (picture) with conforming mesh on the common interface (see attachment geo file). <br class=""><br class=""><span id="cid:ii_jnbul51m1"><compsolid.PNG></span><br class="">But the OpenCASCADE engine will add new Points, Lines or Surfaces during the boolean operation. Thus, Gmsh keeps give me a error "Point/Line/Surface # already exists".<br class=""><br class="">So, is there any method/tricks to avoid this issue? Such as reserve some tag id for the New geometry objects. Why Gmsh not using "newreg" internally to append new geometry?<br class=""></blockquote><div class=""><br class=""></div><div class="">Your surfaces are not correctly oriented, which leads to the creation of new entities when you create "surface loops". The duplicates are reported when you force the creation of new points after these extra entities have been created.</div><div class=""><br class=""></div><div class="">Christophe </div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><img apple-inline="yes" id="979D9DB3-0194-4FC2-A287-A27DAE620446" src="cid:47AEDDCD-105A-4803-8897-6330C83D07D6@home" class=""></div><div class=""><br class=""></div><br class=""><blockquote type="cite" class=""><br class="">Thanks for your help!<br class="">-- <br class="">Bin Wang <br class="">PhD Student<br class="">Craft & Hawkins Department of Petroleum Engineering<br class="">Louisiana State University<br class="">2245 Patrick F Taylor Hall, Baton Rouge, LA 70803<br class=""><span id="cid:f_jnbuy5cr2"><composolid_new.geo></span>_______________________________________________<br class="">gmsh mailing list<br class=""><a href="mailto:gmsh@onelab.info" class="">gmsh@onelab.info</a><br class="">http://onelab.info/mailman/listinfo/gmsh<br class=""></blockquote><br class=""><div class="">— <br class="">Prof. Christophe Geuzaine<br class="">University of Liege, Electrical Engineering and Computer Science <br class=""><a href="http://www.montefiore.ulg.ac.be/~geuzaine" class="">http://www.montefiore.ulg.ac.be/~geuzaine</a><br class=""><br class="">Free software: http://gmsh.info | http://getdp.info | http://onelab.info<br class=""></div><br class=""></body></html>