set default bcname to valid string pointer, some occ tests

libsrc/meshing/basegeom.cpp

@@ -626,11 +626,9 @@ namespace netgen
     for(auto k : Range(faces))
     {
         auto & face = *faces[k];
-        mesh.SetBCName(k, face.properties.GetName());
-        // todo find attached solids
         FaceDescriptor fd(k+1, face.domin+1, face.domout+1, k+1);
-        fd.SetBCName(mesh.GetBCNamePtr(k));
         mesh.AddFaceDescriptor(fd);
+        mesh.SetBCName(k, face.properties.GetName());
         if(face.primary == &face)
         {
             if(MeshFace(mesh, mparam, k, glob2loc))

libsrc/meshing/meshclass.cpp

@@ -6887,14 +6887,11 @@ namespace netgen
         int oldsize = bcnames.Size();
         bcnames.SetSize (bcnr+1);  // keeps contents
         for (int i = oldsize; i <= bcnr; i++)
-          bcnames[i] = nullptr;
+          bcnames[i] = new string("default");
       }
 
     if ( bcnames[bcnr] ) delete bcnames[bcnr];
-    if ( abcname != "default" )
-      bcnames[bcnr] = new string ( abcname );
-    else
-      bcnames[bcnr] = nullptr;
+    bcnames[bcnr] = new string ( abcname );
 
     for (auto & fd : facedecoding)
       if (fd.BCProperty() <= bcnames.Size())

tests/pytest/test_occ.py

@@ -0,0 +1,43 @@
+import pytest
+import math
+from pytest import approx
+from pytest_check import check
+
+def check_volume(shape, volume, dim=3):
+    from netgen.occ import OCCGeometry
+    geo = OCCGeometry(shape, dim=dim)
+
+    m = geo.GenerateMesh()
+    assert len(m.Elements2D()) > 0
+    assert len(m.Elements1D()) > 0
+    if dim==3:
+        assert len(m.Elements3D()) > 0
+
+    ngs = pytest.importorskip("ngsolve")
+    mesh = ngs.Mesh(m)
+    mesh.Curve(5)
+    with check: assert ngs.Integrate(1.0, mesh) == approx(volume)
+
+def test_rect_with_two_holes():
+    occ = pytest.importorskip("netgen.occ")
+
+    face = occ.WorkPlane().Rectangle(7,4) \
+    .Circle(2,2,1).Reverse() \
+    .Circle(5,2,1).Reverse().Face()
+    check_volume(face, 7*4-2*math.pi, 2)
+
+def test_unit_square():
+    occ = pytest.importorskip("netgen.occ")
+    check_volume(occ.unit_square.shape, 1, dim=2)
+
+def test_box_and_cyl():
+    occ = pytest.importorskip("netgen.occ")
+    box = occ.Box(occ.Pnt(0,0,0), occ.Pnt(1,1,1))
+    check_volume(box, 1)
+    r = 0.3
+    h = 0.5
+    vcyl = r*r*math.pi*h
+    cyl = occ.Cylinder(occ.Pnt(1,0.5,0.5), occ.X, r=r, h=h)
+    check_volume(cyl, vcyl)
+    fused = box+cyl
+    check_volume(fused, 1+vcyl)