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  <head>
    <meta content='Tetrahedron.x3d' name='title'/>
    <meta content='Tetrahedron is an 4-sided triangular pyramid with 4 vertices, 4 triangular faces and 6 edges. A regular tetrahedron is a polyhedron assembled from equilateral triangles and is a Platonic solid. Tetrahedron is the simplest of all the ordinary convex polyhedra and the only one that has fewer than 5 faces.' name='description'/>
    <meta content='27 September 2014' name='created'/>
    <meta content='3 September 2025' name='modified'/>
    <meta content='Don Brutzman' name='creator'/>
    <meta content='Tetrahedron.ply' name='reference'/>
    <meta content='https://en.wikipedia.org/wiki/Tetrahedron' name='reference'/>
    <meta content='https://en.wiktionary.org/wiki/tetrahedron' name='reference'/>
    <meta content='https://en.wikipedia.org/wiki/Platonic_solid' name='reference'/>
    <meta content='https://en.wikipedia.org/wiki/Pyramid_(geometry)' name='reference'/>
    <meta content='http://polyhedra.org/poly/show/0/tetrahedron' name='reference'/>
    <meta content='http://www.mathsisfun.com/geometry/tetrahedron.html' name='reference'/>
    <meta content='http://www.kjmaclean.com/Geometry/Tetrahedron.html' name='reference'/>
    <meta content='http://www.georgehart.com/virtual-polyhedra/vp.html' name='reference'/>
    <meta content='http://www.georgehart.com/virtual-polyhedra/vrml/tetrahedron.wrl' name='reference'/>
    <meta content='https://www.web3d.org/x3d/content/examples/X3dForAdvancedModeling/GeometricShapes/Tetrahedron.x3d' name='identifier'/>
    <meta content='Meshlab X3D Exported, http://meshlab.sourceforge.net' name='generator'/>
    <meta content='X3D-Edit 4.0, https://www.web3d.org/x3d/tools/X3D-Edit' name='generator'/>
    <meta content='../license.html' name='license'/>
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  <Scene>
    <WorldInfo title='Tetrahedron.x3d'/>
    <Background skyColor='0.5 1 0.9'/>
    <Viewpoint description='Tetrahedron from Z axis' position='0 0 6'/>
    <Viewpoint description='Tetrahedron from X axis' orientation='0 1 0 1.570796' position='6 0 0'/>
    <Viewpoint description='Tetrahedron from above' orientation='1 0 0 -1.570796' position='0 6 0'/>
    <Shape DEF='Tetrahedron'>
      <IndexedFaceSet coordIndex='0 1 2 -1 0 2 3 -1 0 3 1 -1 3 2 1 -1' solid='false'>
        <Coordinate point='1 1 1 -1 1 -1 -1 -1 1 1 -1 -1'/>
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      <Appearance>
        <Material diffuseColor='0.2 0.5 0.8'/>
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    <!-- Authoring hint #1: add a semitransparent Shape with a unit Sphere here to see relative Tetrahedron size -->
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