Example: Plane Data Format
The plane entity consists of two perpendicular unit vectors (e1 and e2), the normal to the plane (e3), and the origin of the plane. The following illustration shows a plane entity.
Data format:
e1[3]
(dbl)
Unit vector in u direction
e2[3]
(dbl)
Unit vector in v direction
e3[3]
(dbl)
Normal to the plane
origin[3]
(dbl)
Origin of the local coordinate system
Parameterization:
(x, y, z) = u * e1 + v * e2 + origin