// Global mesh object.
// This defines a rectangular mesh composed of two square
// elements with edge lengths of 2.0.
mesh = {

  // This is a two-dimensional mesh.
  dimension = 2

  // We are using zero-indexing (default) rather than one-indexing.
  use-index-zero = true

  // Describe the vertices (nodes) defining the mesh.
  vertices = {

    // The vertices are defined in a 2D coordinate system.
    dimension = 2

    // There are 6 vertices.
    count = 12

    // List the coordinates as:
    // Vertex number (starting from zero), x-coord, y-coord
    // Use coordinate units that are consistent with the other units used.
    coordinates = {
             0     -2.0 -3.0
             1      2.0 -3.0
             2      2.0  3.0
             3     -2.0  3.0
             4     -2.0 -1.0
             5      2.0 -1.0
             6      2.0  1.0
             7     -2.0  1.0
             8      0.0 -3.0
             9      0.0 -1.0
            10      0.0  1.0
            11      0.0  3.0
    }
  }

  // Describe the cells (elements) composing the mesh.
  cells = {

    // There are 2 cells.
    count = 6

    // These are bilinear quadrilateral cells, so there are 4 corners per cell.
    num-corners = 4

    // List the vertices composing each cell,
    // moving counter-clockwise around the cell.
    // List the information as:
    // Cell number (starting from zero), vertex 0, vertex 1, vertex 2, vertex 3
    simplices = {
             0       0  8  9  4
             1       1  5  9  8
             2      10  7  4  9
             3       5  6 10  9
             4       7 10 11  3
             5       6  2 11 10
    }

    // List the material ID's associated with each cell.
    // Different ID's may be used to specify a different material type, or
    // to use a different spatial database for each material ID.
    // In this example, cells 0 and 1 both are associated with material ID 1.
    material-ids = {
             0   0
             1   0
             2   0
             3   0
             4   0
             5   0
    }
  }

  // Here we list different groups (cells or vertices) that we want to associate
  // with a particular name (ID).

  // This group of vertices may be used to define a fault.
  // There are 2 vertices corresponding to indices 2 and 3.
  group = {
    name = fault
    type = vertices
    count = 2
    indices = {
       9
      10
    }
  }

  // This group of vertices may be used to specify boundary conditions.
  // There are 2 vertices corresponding to indices 0 and 4.
  group = {
    name = y_neg
    type = vertices
    count = 3
    indices = {
      0
      1
      8
    }
  }

  // This group of vertices may be used to specify boundary conditions.
  // There are 2 vertices corresponding to indices 0 and 1.
  group = {
    name = x_neg
    type = vertices
    count = 4
    indices = {
      0
      3
      4
      7
    }
  }

  // This group of vertices may be used to specify boundary conditions.
  // There are 2 vertices corresponding to indices 4 and 5.
  group = {
    name = x_pos
    type = vertices
    count = 4
    indices = {
      1
      5
      6
      2
    }
  }

  // This group of vertices may be used to specify boundary conditions.
  // There is 1 vertex corresponding to index 3.
  group = {
    name = y_pos
    type = vertices
    count = 3
    indices = {
      2
      3
     11
    }
  }
}