Quadray coordinates, also known as caltrop, tetray or Chakovian coordinates (named for David Chako), were developed by Darrel Jarmusch (in 1981) and others, as another take on simplicial coordinates, a coordinate system using a simplex or tetrahedron as its basis polyhedron. == Geometric definition == The four basis (but not necessarily unit) vectors stem from the center of a regular tetrahedron and go to its four corners.
Quadray coordinates, also known as caltrop, tetray or Chakovian coordinates (named for David Chako), were developed by Darrel Jarmusch (in 1981) and others, as another take on simplicial coordinates, a coordinate system using a simplex or tetrahedron as its basis polyhedron. == Geometric definition == The four basis (but not necessarily unit) vectors stem from the center of a regular tetrahedron and go to its four corners.
Source: Wikipedia "Quadray coordinates" · CC BY-SA 4.0
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