From: Wolfgang Bangerth <bangerth@math.tamu.edu>
Date: Mon, 30 Jun 2014 10:23:46 +0000 (+0000)
Subject: Add another testcase that currently fails, see issue 197 (https://code.google.com... 
X-Git-Tag: v8.2.0-rc1~348
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b50a3b8d605c7809dc072af7bf08f258c9453b98;p=dealii.git

Add another testcase that currently fails, see issue 197 (https://code.google.com/p/dealii/issues/detail?id=197).

git-svn-id: https://svn.dealii.org/trunk@33100 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/tests/fail/merge_triangulations_03.cc b/tests/fail/merge_triangulations_03.cc
new file mode 100644
index 0000000000..f263da0f40
--- /dev/null
+++ b/tests/fail/merge_triangulations_03.cc
@@ -0,0 +1,172 @@
+// ---------------------------------------------------------------------
+// $Id$
+//
+// Copyright (C) 2014 by the deal.II authors
+//
+// This file is part of the deal.II library.
+//
+// The deal.II library is free software; you can use it, redistribute
+// it, and/or modify it under the terms of the GNU Lesser General
+// Public License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+// The full text of the license can be found in the file LICENSE at
+// the top level of the deal.II distribution.
+//
+// ---------------------------------------------------------------------
+
+// This script reproduces an issue with merging a hyper ball within a 
+// hyper shell using dealII-8.0.0.
+//
+// Test by Bamdad Hosseini <bamdad.hosseini@gmail.com> (see mail to mailing
+// list on 6/20/2014)
+
+
+#include "../tests.h"
+#include <deal.II/grid/tria.h>
+#include <deal.II/dofs/dof_handler.h>
+#include <deal.II/grid/grid_generator.h>
+#include <deal.II/grid/tria_accessor.h>
+#include <deal.II/grid/tria_iterator.h>
+#include <deal.II/grid/tria_boundary_lib.h>
+#include <deal.II/grid/grid_out.h>
+#include <deal.II/grid/grid_tools.h>
+#include <deal.II/grid/grid_refinement.h>
+
+#include <fstream>
+#include <iostream>
+#include <cmath>
+#include <deal.II/base/logstream.h>
+
+std::ofstream logfile("output");
+
+
+template <int dim>
+void flatten_triangulation( Triangulation<dim> &tria_in, Triangulation<dim> &tria_out )
+// takes a possibly refined triangulation and returns a new coarse triangulation
+// created from the vertices of the input
+{
+
+  // we start by extracting the number of vertices and cell is 
+  // the original triangulation
+
+  unsigned int n_vertices = tria_in.n_vertices();
+  unsigned int n_cells = tria_in.n_cells();
+  unsigned int n_active_cells = tria_in.n_active_cells();
+  
+  // also get all vertices 
+  const std::vector< Point<dim> > vertices = tria_in.get_vertices();
+
+  // now we need to loop over all cells and extract the cell data.
+  typename Triangulation<dim>::active_cell_iterator
+    cell=tria_in.begin_active(),
+    endc=tria_in.end();
+
+  std::vector< CellData<dim> > cells(n_active_cells, CellData<dim>());
+
+  unsigned int cell_counter = 0;
+  for(; cell!=endc; ++cell)
+    {
+      for (unsigned int j=0; 
+	   j < GeometryInfo<dim>::vertices_per_cell;
+	   ++j) {
+	cells[cell_counter].vertices[j] = cell->vertex_index(j);
+      }
+      cells[cell_counter].material_id=0;
+      ++cell_counter;
+    }
+
+  // pass the info to create_triangulation to create the flat mesh
+  tria_out.create_triangulation(vertices, cells, SubCellData() );
+}
+
+// this is a function to provide some basic information about the 
+// triangulations. The code inside can be ignored. It produces an 
+// eps image of the mesh so we can see the nodes are at the right 
+// place.
+
+template<int dim>
+void mesh_info(const Triangulation<dim> &tria, 
+	       const std::string        &filename)
+{
+  deallog << "Mesh info for " << filename << ":" << std::endl
+            << " dimension: " << dim << std::endl
+            << " no. of cells: " << tria.n_active_cells() << std::endl;
+
+  {
+    std::map<unsigned int, unsigned int> boundary_count;
+    typename Triangulation<dim>::active_cell_iterator
+      cell = tria.begin_active(),
+      endc = tria.end();
+    for (; cell!=endc; ++cell)
+      {
+	for (unsigned int face=0;
+	     face<GeometryInfo<dim>::faces_per_cell; 
+	     ++face)
+	  {
+	    if (cell->face(face)->at_boundary())
+	      boundary_count[cell->face(face)->boundary_indicator()]++;
+	  }
+      }
+    deallog << " boundary indicators: ";
+    for (std::map<unsigned int, 
+	   unsigned int>::iterator it=boundary_count.begin();
+	 it!=boundary_count.end();
+	 ++it)
+      {
+	deallog << it->first << "(" << it->second << " times) ";
+      }
+    deallog << std::endl;
+  }
+}
+
+
+void test ()
+{  
+  Point<2> center;
+  
+  Triangulation<2> ball;
+  Triangulation<2> flat_ball;
+  Triangulation<2> shell;
+  Triangulation<2> tria_out;
+
+  // create the two meshes
+  GridGenerator::hyper_ball( ball, center, 0.5 );
+  GridGenerator::hyper_shell(shell, center, 0.5, 1, 8, true); //colorize flag set to true so outer bnd is 1 and inner is 0
+
+  // set boundaries 
+  static const HyperBallBoundary<2> inner_bnd(center, 0.5); 
+  static const HyperBallBoundary<2> outer_bnd(center, 1);
+
+  ball.set_boundary(0, inner_bnd);
+  shell.set_boundary(0, inner_bnd);
+  shell.set_boundary(1, outer_bnd);
+
+  // first we need to refine the ball once to get the right 
+  // nodes to merge the meshes
+  ball.refine_global(1);
+  
+  // flatten the refined ball so we have a coarse mesh to merge 
+  flatten_triangulation( ball, flat_ball );
+
+  mesh_info( shell, "shell.eps" );
+  mesh_info( ball, "ball.eps" );
+  mesh_info( flat_ball, "flat_ball.eps" );
+
+  // now we merge (this throws an exception with no error messages 
+  GridGenerator::merge_triangulations( flat_ball, shell, tria_out );
+  mesh_info(tria_out, "tria_out.eps");
+}
+
+
+int main ()
+{
+  deallog << std::setprecision(2);
+  logfile << std::setprecision(2);
+  deallog.attach(logfile);
+  deallog.depth_console(0);
+  deallog.threshold_double(1.e-10);
+
+  test ();
+  
+  return 0;
+}