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Reference.org
Hierarchical triangular mesh
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<p>Hierarchical Triangular Mesh (HTM) is a kind of <a href="/facts/Quadtree/6b23FQoD">quad tree</a> based on subdivision of a distorted <a href="/facts/Octahedron/G38q92xW">octahedron</a>, used for <a href="/facts/Mesh_generation/4YArjFyH">mesh generation</a> in <a href="/facts/3D_computer_graphics/zlWW6eaF">3-D computer graphics</a> and <a href="/facts/Geometric_data_analysis/YsRnUqnW">geometric data structures</a>. </p>