PolyLineMeshGenerator

Generates meshes from edges connecting a list of points.

Using the PolyLineMeshGenerator object from within the Mesh block of the input file will construct an open or closed (looped) one-dimensional manifold of Edge elements connecting each adjacent pair of points in a user-specified list. Points can live in 3-D space by default, but loops in the X-Y plane are particularly useful as inputs to subsequent triangulator mesh generators.

Example

The following Mesh block will connect the specified 3 points with a total of 9 Edge2 elements.

[Mesh]
  [poly]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              1.0 1.0 1.0
              1.0 2.0 3.0'
    loop = true
    num_edges_between_points = 3
  []
[]

Input Parameters

end_boundaryendBoundary to assign to (non-looped) polyline end
Default:end
C++ Type:BoundaryName
Unit:(no unit assumed)
Controllable:No
Description:Boundary to assign to (non-looped) polyline end
loopFalseWhether edges should form a closed loop
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Whether edges should form a closed loop
num_edges_between_points1How many Edge elements to build between each point pair
Default:1
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:How many Edge elements to build between each point pair
pointsThe points defining the polyline, in order
C++ Type:std::vector<libMesh::Point>
Unit:(no unit assumed)
Controllable:No
Description:The points defining the polyline, in order
start_boundarystartBoundary to assign to (non-looped) polyline start
Default:start
C++ Type:BoundaryName
Unit:(no unit assumed)
Controllable:No
Description:Boundary to assign to (non-looped) polyline start

Optional Parameters

control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector<std::string>
Unit:(no unit assumed)
Controllable:No
Description:Adds user-defined labels for accessing object parameters via control logic.
enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Set the enabled status of the MooseObject.
save_with_nameKeep the mesh from this mesh generator in memory with the name specified
C++ Type:std::string
Unit:(no unit assumed)
Controllable:No
Description:Keep the mesh from this mesh generator in memory with the name specified

Advanced Parameters

nemesisFalseWhether or not to output the mesh file in the nemesisformat (only if output = true)
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Whether or not to output the mesh file in the nemesisformat (only if output = true)
outputFalseWhether or not to output the mesh file after generating the mesh
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Whether or not to output the mesh file after generating the mesh
show_infoFalseWhether or not to show mesh info after generating the mesh (bounding box, element types, sidesets, nodesets, subdomains, etc)
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Whether or not to show mesh info after generating the mesh (bounding box, element types, sidesets, nodesets, subdomains, etc)

Debugging Parameters

Input Files

(test/tests/meshgenerators/polyline_mesh_generator/polyline_mesh_generator_loop_refine.i)
(test/tests/meshgenerators/polyline_mesh_generator/polyline_mesh_generator_bad_boundary.i)
(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_smoothed.i)
(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_auto_area_func.i)
(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_open_polyline.i)
(test/tests/meshgenerators/polyline_mesh_generator/polyline_mesh_generator_good_boundary.i)
(modules/reactor/test/tests/meshgenerators/peripheral_ring_mesh_generator/err_mix_type.i)
(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_nested.i)
(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_area_func.i)
(test/tests/meshgenerators/polyline_mesh_generator/polyline_mesh_generator_loop.i)
(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_with_holes.i)
(test/tests/meshgenerators/polyline_mesh_generator/polyline_mesh_generator_refine.i)
(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_from_2d_bcids.i)
(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_with_hole_names.i)
(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_multiline.i)
(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_stitching.i)
(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_mesh_generator.i)
(test/tests/userobjects/geometry_snap/block.i)
(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_quadratic.i)
(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_from_1d_sbdids.i)
(test/tests/meshgenerators/polyline_mesh_generator/polyline_mesh_generator.i)

(test/tests/meshgenerators/polyline_mesh_generator/polyline_mesh_generator_loop_refine.i)

[Mesh]
  [poly]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              1.0 1.0 1.0
              1.0 2.0 3.0'
    loop = true
    num_edges_between_points = 3
  []
[]

(test/tests/meshgenerators/polyline_mesh_generator/polyline_mesh_generator_loop_refine.i)

[Mesh]
  [poly]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              1.0 1.0 1.0
              1.0 2.0 3.0'
    loop = true
    num_edges_between_points = 3
  []
[]

(test/tests/meshgenerators/polyline_mesh_generator/polyline_mesh_generator_bad_boundary.i)

[Mesh]
  [poly]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              1.0 1.0 1.0
              1.0 2.0 3.0'
    # This should error for 16-bit boundary id configs:
    start_boundary = 40000
    # This should error even for 64-bit boundary id configs:
    end_boundary = 123456789012345678901234567890
  []
[]

(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_smoothed.i)

[Mesh]
  [inner_square_sbd_0]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 3
    ny = 3
    xmin = -0.4
    xmax = 0.4
    ymin = -0.4
    ymax = 0.4
  []
  [inner_square]
    type = SubdomainIDGenerator
    input = inner_square_sbd_0
    subdomain_id = 1 # Exodus dislikes quad ids matching tri ids
  []
  [layer_2_bdy]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              0.0 -1.0 0.0
              1.0 0.0 0.0
              0.0 1.0 0.0'
    loop = true
  []
  [layer_3_bdy]
    type = PolyLineMeshGenerator
    points = '-1.5 -1.5 0.0
              1.5 -1.5 0.0
              1.5 1.5 0.0
              -1.5 1.5 0.0'
    loop = true
  []
  [layer_4_bdy]
    type = PolyLineMeshGenerator
    points = '-4.0 0.0 0.0
              0.0 -4.0 0.0
              4.0 0.0 0.0
              0.0 4.0 0.0'
    loop = true
  []
  [triang_2]
    type = XYDelaunayGenerator
    boundary = 'layer_2_bdy'
    holes = 'inner_square'
    stitch_holes = 'true'
    refine_holes = 'false'
    add_nodes_per_boundary_segment = 2
    refine_boundary = false
    desired_area = 0.05
    smooth_triangulation = true
  []
  [triang_3]
    type = XYDelaunayGenerator
    boundary = 'layer_3_bdy'
    holes = 'triang_2'
    stitch_holes = 'true'
    refine_holes = 'false'
    add_nodes_per_boundary_segment = 2
    refine_boundary = false
    desired_area = 0.1
    # smooth_triangulation = false # default
  []
  [triang_4]
    type = XYDelaunayGenerator
    boundary = 'layer_4_bdy'
    holes = 'triang_3'
    stitch_holes = 'true'
    refine_holes = 'false'
    add_nodes_per_boundary_segment = 2
    refine_boundary = true
    desired_area = 0.2
    smooth_triangulation = true
  []
[]

(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_auto_area_func.i)

[Mesh]
  [outer_bdy]
    type = ParsedCurveGenerator
    x_formula = 'r*cos(t)'
    y_formula = 'r*sin(t)'
    section_bounding_t_values = '${fparse 0.0} ${fparse pi} ${fparse 2.0*pi}'
    constant_names = 'r'
    constant_expressions = '1.0'
    nums_segments = '8 16'
    is_closed_loop = true
  []
  [hole_1]
    type = PolyLineMeshGenerator
    points = '-0.5 -0.1 0.0
              -0.3 -0.1 0.0
              -0.3 0.1 0.0
              -0.5 0.1 0.0'
    loop = true
  []
  [hole_2]
    type = PolyLineMeshGenerator
    points = '0.3 -0.1 0.0
              0.5 -0.1 0.0
              0.5 0.1 0.0
              0.3 0.1 0.0'
    loop = true
    num_edges_between_points = 3
  []
  [triang]
    type = XYDelaunayGenerator
    boundary = 'outer_bdy'
    holes = 'hole_1
             hole_2'
    refine_boundary = false
    refine_holes = "false false"
    use_auto_area_func = "true"
  []
[]

[Problem]
  solve = false
[]

[AuxVariables]
  [quality]
    family = MONOMIAL
    order = CONSTANT
  []
[]

[AuxKernels]
  [qa]
    type = ElementQualityAux
    variable = quality
    metric = SHAPE
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
[]

[Postprocessors]
  [avg_quality]
    type = ElementAverageValue
    variable = quality
  []
  [elem_size]
    type = AverageElementSize
  []
  [area]
    type = VolumePostprocessor
  []
[]

[Outputs]
  csv = true
  execute_on = 'FINAL'
[]

(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_open_polyline.i)

[Mesh]
  [outer_bdy]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              0.0 -1.0 0.0
              1.0 0.0 0.0
              0.0 2.0 0.0'
    loop = false
  []
  [triang]
    type = XYDelaunayGenerator
    boundary = 'outer_bdy'
    add_nodes_per_boundary_segment = 3
    refine_boundary = false
    desired_area = 0.05
  []
[]

(test/tests/meshgenerators/polyline_mesh_generator/polyline_mesh_generator_good_boundary.i)

[Mesh]
  [poly]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              1.0 1.0 1.0
              1.0 2.0 3.0'
    start_boundary = 'non_numbered'
    end_boundary = 42
  []
[]

(modules/reactor/test/tests/meshgenerators/peripheral_ring_mesh_generator/err_mix_type.i)

[Mesh]
  [obdry_1]
    type = PolyLineMeshGenerator
    points = '-1 0 0
              0 0 0
              0 1 0
              -1 1 0'
    loop = true
    num_edges_between_points = 2
  []
  [tri_1]
    type = XYDelaunayGenerator
    boundary = 'obdry_1'
    refine_boundary = false
    output_subdomain_name = 1
    output_boundary = 10
  []
  [obdry_2]
    type = PolyLineMeshGenerator
    points = '1 0 0
              0 0 0
              0 1 0
              1 1 0'
    loop = true
    num_edges_between_points = 1
  []
  [tri_2]
    type = XYDelaunayGenerator
    boundary = 'obdry_2'
    refine_boundary = false
    output_subdomain_name = 2
    output_boundary = 10
  []
  [convert]
    type = ElementOrderConversionGenerator
    input = tri_2
    conversion_type = SECOND_ORDER
  []
  [smg]
    type = StitchedMeshGenerator
    inputs = 'tri_1 convert'
    stitch_boundaries_pairs = '10 10'
    parallel_type = 'replicated'
    prevent_boundary_ids_overlap = false
  []
  [pr]
    type = PeripheralRingMeshGenerator
    input = smg
    peripheral_layer_num = 4
    peripheral_ring_radius = 15
    input_mesh_external_boundary = 10
    peripheral_ring_block_id = 250
    peripheral_ring_block_name = reactor_ring
  []
[]

(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_nested.i)

[Mesh]
  [inner_square_sbd_0]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 3
    ny = 3
    xmin = -0.4
    xmax = 0.4
    ymin = -0.4
    ymax = 0.4
  []
  [inner_square]
    type = SubdomainIDGenerator
    input = inner_square_sbd_0
    subdomain_id = 1 # Exodus dislikes quad ids matching tri ids
  []
  [layer_2_bdy]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              0.0 -1.0 0.0
              1.0 0.0 0.0
              0.0 1.0 0.0'
    loop = true
  []
  [layer_3_bdy]
    type = PolyLineMeshGenerator
    points = '-1.5 -1.5 0.0
              1.5 -1.5 0.0
              1.5 1.5 0.0
              -1.5 1.5 0.0'
    loop = true
  []
  [layer_4_bdy]
    type = PolyLineMeshGenerator
    points = '-4.0 0.0 0.0
              0.0 -4.0 0.0
              4.0 0.0 0.0
              0.0 4.0 0.0'
    loop = true
  []
  [triang_2]
    type = XYDelaunayGenerator
    boundary = 'layer_2_bdy'
    holes = 'inner_square'
    stitch_holes = 'true'
    refine_holes = 'false'
    verify_holes = false
    add_nodes_per_boundary_segment = 2
    refine_boundary = false
    desired_area = 0.05
  []
  [triang_3]
    type = XYDelaunayGenerator
    boundary = 'layer_3_bdy'
    holes = 'triang_2'
    stitch_holes = 'true'
    refine_holes = 'false'
    add_nodes_per_boundary_segment = 2
    refine_boundary = false
    desired_area = 0.1
  []
  [triang_4]
    type = XYDelaunayGenerator
    boundary = 'layer_4_bdy'
    holes = 'triang_3'
    stitch_holes = 'true'
    refine_holes = 'false'
    verify_holes = false
    add_nodes_per_boundary_segment = 2
    refine_boundary = true
    desired_area = 0.2
  []
[]

(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_area_func.i)

[Mesh]
  [outer_bdy]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              0.0 -1.0 0.0
              1.0 0.0 0.0
              0.0 2.0 0.0'
    loop = true
  []
  [hole_1]
    type = PolyLineMeshGenerator
    points = '-0.5 -0.1 0.0
              -0.3 -0.1 0.0
              -0.3 0.1 0.0
              -0.5 0.1 0.0'
    loop = true
  []
  [hole_2]
    type = PolyLineMeshGenerator
    points = '0.3 -0.1 0.0
              0.5 -0.1 0.0
              0.5 0.1 0.0
              0.3 0.1 0.0'
    loop = true
  []
  [triang]
    type = XYDelaunayGenerator
    boundary = 'outer_bdy'
    holes = 'hole_1
             hole_2'
    desired_area_func = '(x+1.5)*(y+1.5)*0.01'
  []
[]

(test/tests/meshgenerators/polyline_mesh_generator/polyline_mesh_generator_loop.i)

[Mesh]
  [poly]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              1.0 1.0 1.0
              1.0 2.0 3.0'
    loop = true
  []
[]

(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_with_holes.i)

[Mesh]
  [outer_bdy]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              0.0 -1.0 0.0
              1.0 0.0 0.0
              0.0 2.0 0.0'
    loop = true
  []
  [hole_1]
    type = PolyLineMeshGenerator
    points = '-0.5 -0.1 0.0
              -0.3 -0.1 0.0
              -0.3 0.1 0.0
              -0.5 0.1 0.0'
    loop = true
  []
  [hole_2]
    type = PolyLineMeshGenerator
    points = '0.3 -0.1 0.0
              0.5 -0.1 0.0
              0.5 0.1 0.0
              0.3 0.1 0.0'
    loop = true
  []
  [triang]
    type = XYDelaunayGenerator
    boundary = 'outer_bdy'
    holes = 'hole_1
             hole_2'
    add_nodes_per_boundary_segment = 3
    refine_boundary = false
    desired_area = 0.05
  []
[]

(test/tests/meshgenerators/polyline_mesh_generator/polyline_mesh_generator_refine.i)

[Mesh]
  [poly]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              1.0 1.0 1.0
              1.0 2.0 3.0'
    num_edges_between_points = 4
    bcid0 = 123
    bcid1 = 456
  []
[]

(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_from_2d_bcids.i)

[Mesh]
  [left_bdy]
    type = PolyLineMeshGenerator
    points = '-3.0 0.0 0.0
              -2.0 -1.0 0.0
              -1.0 0.0 0.0
              -2.0 2.0 0.0'
    loop = true
  []
  [right_bdy]
    type = PolyLineMeshGenerator
    points = '3.0 0.0 0.0
              2.0 -1.0 0.0
              1.0 0.0 0.0
              2.0 2.0 0.0'
    loop = true
  []
  [left_2d]
    type = XYDelaunayGenerator
    boundary = 'left_bdy'
  []
  [right_2d]
    type = XYDelaunayGenerator
    boundary = 'right_bdy'
    output_boundary = 'right_outer'
  []
  [both_2d]
    type = CombinerGenerator
    inputs = 'left_2d right_2d'
  []
  [triang]
    type = XYDelaunayGenerator
    boundary = 'both_2d'
    input_boundary_names = 'right_outer' # only the right half
    refine_boundary = true
    desired_area = 0.2
  []
[]

(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_with_hole_names.i)

[Mesh]
  [outer_bdy]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              0.0 -1.0 0.0
              1.0 0.0 0.0
              0.0 2.0 0.0'
    loop = true
  []
  [hole_1]
    type = PolyLineMeshGenerator
    points = '-0.5 -0.1 0.0
              -0.3 -0.1 0.0
              -0.3 0.1 0.0
              -0.5 0.1 0.0'
    loop = true
  []
  [hole_2]
    type = PolyLineMeshGenerator
    points = '0.3 -0.1 0.0
              0.5 -0.1 0.0
              0.5 0.1 0.0
              0.3 0.1 0.0'
    loop = true
  []
  [triang]
    type = XYDelaunayGenerator
    boundary = 'outer_bdy'
    holes = 'hole_1
             hole_2'
    hole_boundaries = 'left_hole
                       right_hole'
    add_nodes_per_boundary_segment = 3
    refine_boundary = false
    desired_area = 0.05
  []
[]

(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_multiline.i)

[Mesh]
  [line1]
    type = PolyLineMeshGenerator
    points = '0.0 0.0 0.0
              1.0 0.0 0.0'
  []
  [line2]
    type = PolyLineMeshGenerator
    points = '1.0 0.0 0.0
              0.0 1.0 0.0'
  []
  [outer_bdy]
    type = StitchedMeshGenerator
    inputs = "line1 line2"
    stitch_boundaries_pairs = '2 1'
  []
  [triang]
    type = XYDelaunayGenerator
    boundary = 'outer_bdy'
    add_nodes_per_boundary_segment = 4
    refine_boundary = false
    desired_area = 0.05
  []
[]

(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_stitching.i)

[Mesh]
  [outer_bdy]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              0.0 -1.0 0.0
              1.0 0.0 0.0
              0.0 2.0 0.0'
    loop = true
  []
  [hole_1]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 3
    ny = 3
    xmin = -0.5
    xmax = -0.3
    ymin = -0.1
    ymax = 0.1
  []
  [hole_1_name]
    type = RenameBlockGenerator
    input = hole_1
    old_block = 0
    new_block = hole
  []
  [hole_2]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 3
    ny = 3
    xmin = 0.3
    xmax = 0.5
    ymin = -0.1
    ymax = 0.1
  []
  [hole_2_name_1]
    type = RenameBlockGenerator
    input = hole_2
    old_block = 0
    new_block = 1
  []
  [hole_2_name_2]
    type = RenameBlockGenerator
    input = hole_2_name_1
    old_block = 1
    new_block = hole
  []
  [triang]
    type = XYDelaunayGenerator
    boundary = 'outer_bdy'
    holes = 'hole_1_name
             hole_2'
    stitch_holes = 'true
                    false'
    refine_holes = 'false
                    false'
    add_nodes_per_boundary_segment = 3
    refine_boundary = false
    desired_area = 0.05
    output_subdomain_name = "triangles"
  []
[]

(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_mesh_generator.i)

[Mesh]
  [outer_bdy]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              0.0 -1.0 0.0
              1.0 0.0 0.0
              0.0 2.0 0.0'
    loop = true
  []
  [triang]
    type = XYDelaunayGenerator
    boundary = 'outer_bdy'
    add_nodes_per_boundary_segment = 3
    refine_boundary = false
    desired_area = 0.05
  []
[]

(test/tests/userobjects/geometry_snap/block.i)

[Mesh]
  [gen]
    type = PolyLineMeshGenerator
    points = "0 0 0
              0 1 0
              1 1 0
              1 0 0"
    loop = true
  []
[]

[Variables]
  [u]
    initial_condition = 1
  []
[]

[Problem]
  kernel_coverage_check = false
  solve = false
[]

[Executioner]
  type = Steady
[]

[UserObjects]
  [sphere]
    type = GeometrySphere
    center = '0.5 0.5 0'
    radius = 0.7071
    block = 0
  []
[]

[Adaptivity]
  [Markers]
    [const]
      type = UniformMarker
      mark = REFINE
    []
  []
  marker = const
  steps = 3
[]

[Outputs]
  [out]
    type = Exodus
  []
[]

(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_quadratic.i)

[Mesh]
  [fmg]
    type = FileMeshGenerator
    file = accg_one_layer_quadratic.e
  []
  [ext]
    type = PolyLineMeshGenerator
    points = '-4.0 0.0 0.0
              0.0 -4.0 0.0
              4.0 0.0 0.0
              0.0 4.0 0.0'
    loop = true
  []
  [xyd]
    type = XYDelaunayGenerator
    boundary = 'ext'
    holes = 'fmg'
    stitch_holes = 'true'
    refine_holes = 'false'
    verify_holes = 'false'
    add_nodes_per_boundary_segment = 2
    refine_boundary = true
    desired_area = 1.0
    tri_element_type = TRI6
  []
[]

(test/tests/meshgenerators/xy_delaunay_generator/xydelaunay_from_1d_sbdids.i)

[Mesh]
  [left_bdy]
    type = PolyLineMeshGenerator
    points = '-3.0 0.0 0.0
              -2.0 -1.0 0.0
              -1.0 0.0 0.0
              -2.0 2.0 0.0'
    loop = true
  []
  [right_bdy]
    type = PolyLineMeshGenerator
    points = '3.0 0.0 0.0
              2.0 -1.0 0.0
              1.0 0.0 0.0
              2.0 2.0 0.0'
    loop = true
  []
  [right_sbd1]
    type = SubdomainIDGenerator
    input = right_bdy
    subdomain_id = 1
  []
  [both_bdy]
    type = CombinerGenerator
    inputs = 'left_bdy right_sbd1'
  []
  [triang]
    type = XYDelaunayGenerator
    boundary = 'both_bdy'
    input_subdomain_names = 1 # only the right half
    refine_boundary = true
    desired_area = 0.2
  []
[]

(test/tests/meshgenerators/polyline_mesh_generator/polyline_mesh_generator.i)

[Mesh]
  [poly]
    type = PolyLineMeshGenerator
    points = '-1.0 0.0 0.0
              1.0 1.0 1.0
              1.0 2.0 3.0'
  []
[]

Example
Input Parameters
Input Files