| Schumaker, L. L., Triangulation methods in CAGD, IEEE Comp. Graph. Appl. 13 (1993), 47--52. |
....disk or equals S, where S is the unit sphere, 3) each face of a trihedron in T is either on the boundary of Omega or it is a common face of precisely two trihedra in T . Each of the T [i] S is a spherical triangle, and Delta = fT [i] Sg N i=1 is a spherical triangulation, cf. [18]. We say a trihedral decomposition T is total if Omega = IR 3 . Otherwise, we say that it is partial. It will be convenient to denote the set of unit vectors defining the rays of the trihedra in T by V. If T is a partial trihedral decomposition, it is natural to define rays to be boundary rays ....
Schumaker, L. L., Triangulation methods in CAGD, IEEE Comp. Graph. Appl. 13 (1993), 47--52.
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