Mesh Regions 

Mesh-based regions represent regions using simple special regions, called cells, such as point, line, triangle, and tetrahedron. MeshRegion represents the region as a disjoint union of simple cells. BoundaryMeshRegion represents a full-dimensional region using a ray-boundary intersection rule to define what points are in the region. Mesh-based regions are typically created by discretizing other regions or graphics or by automated construction from point sets. Mesh-based regions are what is traditionally called computational geometry.

Mesh regions in 1D.

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Mesh regions in 2D.

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Mesh regions in 3D.

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Boundary mesh region in 1D.

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Boundary mesh regions in 2D.

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Boundary mesh regions in 3D.

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