Mesh cells for a MeshRegion in 1D:

The 0D cells also include the end points of the line:

The 1D cells:

Mesh cells for a MeshRegion in 2D:

The 0D cells include all the corner points:

The 1D cells include all the edges:

The only 2D cell is used as input:

Mesh cells for a MeshRegion in 3D:

The 0D cells:

The 1D cells:

The 2D cells:

Mesh cells for a MeshRegion in 1D:

The 0D cells also include the end points of the line:

The 1D cells:

Mesh cells for a MeshRegion in 2D:

The 0D cells include all the corner points:

The 1D cells include all the edges:

The only 2D cell is used as input:

Mesh cells for a MeshRegion in 3D:

The 0D cells:

The 1D cells:

The 2D cells:

Mixed dimensions:

The indices given in MeshCells correspond to MeshCoordinates:

Construct a MeshRegion directly:

Create a GraphicsComplex:

Specify a list of 1D cell primitives:

Alternatively, you can specify a head and indices:

A list of 2D cell primitives:

Extract the lines from a MeshRegion to make a wireframe mesh:

The indices given in MeshCells correspond to MeshCoordinates:

Create the wireframe mesh:

The indices in MeshCells refer to the MeshCoordinates:

Culling of unused coordinates may change cell indices:

The cell indices refer to MeshCoordinates, not the input coordinates: