Hierarchical triangular mesh

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Diagram of Hierarchical Triangular Mesh (HTM). The spherical polygons are the projection of the edges of the octahedron onto the circumscribing sphere.

Hierarchical Triangular Mesh (HTM) is a kind of quad tree based on subdivision of a distorted octahedron, used for mesh generation in 3-D computer graphics and geometric data structures.[1]

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