Bugfix: Don't crash in normal computation at boundaries

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@14769 383ad7c9-94d9-4d36-a494-682f7c89f535

RemesherPlugin.cc

@@ -165,6 +165,10 @@ void RemesherPlugin::computeInitValues() {
         TriMesh::FaceHandle fh1 = mesh->face_handle(he);
         TriMesh::FaceHandle fh2 = mesh->face_handle(mesh->opposite_halfedge_handle(he));
 
+        // Boundary halfedge?
+        if ( !fh2.is_valid() || !fh2.is_valid() )
+          continue;
+
         TriMesh::Normal n1 = mesh->normal(fh1);
         TriMesh::Normal n2 = mesh->normal(fh2);
 
@@ -195,6 +199,10 @@ void RemesherPlugin::computeInitValues() {
         PolyMesh::FaceHandle fh1 = mesh->face_handle(he);
         PolyMesh::FaceHandle fh2 = mesh->face_handle(mesh->opposite_halfedge_handle(he));
 
+        // Boundary halfedge?
+        if ( !fh2.is_valid() || !fh2.is_valid() )
+          continue;
+
         PolyMesh::Normal n1 = mesh->normal(fh1);
         PolyMesh::Normal n2 = mesh->normal(fh2);