add extrudesurf function to expand an open surface into a solid

extrudesurf.m

@@ -0,0 +1,32 @@
+function [node,face]=extrudesurf(no,fc,vec)
+%
+% [node,face]=extrudesurf(no,fc,vec)
+% 
+% create a enclosed surface mesh by extruding an open surface
+%
+% author: Qianqian Fang, <q.fang at neu.edu>
+%
+% input:
+%
+% output:
+%      node: 3D node coordinates for the generated surface mesh
+%      face: triangular face patches of the generated surface mesh, each
+%           row represents a triangle denoted by the indices of the 3 nodes
+%
+% -- this function is part of iso2mesh toolbox (http://iso2mesh.sf.net)
+%
+
+nlen=size(no,1);
+if(length(vec)>1)
+   node=[no; no+repmat(vec(:)', nlen,1)];
+else
+   node=[no; no+vec*nodesurfnorm(no, fc)];
+end
+
+face=[fc; fc+nlen];
+
+edge=surfedge(fc);
+sideface=[edge edge(:,1)+nlen; edge+nlen edge(:,2)];
+face=[face; sideface];
+
+