Question on 2d boundary layer

Netgen
1

Hi, I am using netgen 2401 and occt 7.6.0 for boundarylayer mesh generation. When using function GenerateBoundaryLayer2 to generate 2d boundary layer for edge 0, it seem it will not fill the left zone starting from the new adfront.
The geometry is a rectangle on x-y surface
Any help on this issue?

boundary layer issue
boundary layer issue1087×697 64.3 KB

    netgen::OCCParameters gp;
	_mesh->SetGeometry(std::shared_ptr<netgen::NetgenGeometry>(_geom, [](netgen::NetgenGeometry*) {; }));
	netgen::OCCFindEdges(_geom, *_mesh, *_mp);
	else
	{
		std::cout << "Number of edge points: " << nPointsInEdgeMesh << std::endl;
	}

	// Create surface mesh
	std::cout << "Creating Surface Mesh ..." << std::endl;
	//_geom->MeshSurface(*_mesh, *_mp);

	netgen::Array<int> boundaries;
	netgen::Array<double> thicknesses;
	boundaries.Append(0);
	thicknesses.Append(1);
	netgen::GenerateBoundaryLayer2(*_mesh, 0, thicknesses, false, boundaries);