/Parallelepiped

/Parallelepiped describes a parallelepiped, which is the following skewed box.

1.

The top and bottom facets are identical parallelograms.

2.

The top parallelogram is on plane z = +dz and the bottom parallelogram on plane z = -dz.

3.

The center locates at the origin.

4.

A line joining the centers of the top and bottom parallelograms is skewed by angles (polar angle) and (azimuthal angle).

5.

Two edges of the top (or bottom) parallelogram are parallel to the x axis. Their length is dx, and distance between them, i.e., height of the parallelogram, is dy.

6.

The top (or bottom) parallelogram skews by angle in the x direction. That is, is the angle formed the y axis and a line joining middle points of the two x-directional edges mentioned above.

/Parallelepiped corresponds to class G4Para of GEANT4.

Format /Parallelepiped dx dy dz tan(alpha) tan(theat)*cos(phi) tan(theta)*sin(phi)

dx half length of edges parallel to the x axis

dy half height of the top and bottom parallelograms along the y axis

dz half height of this parallelepiped along the z axis tan(alph) alpha : angle expressing skew of the top and bottom parallelograms in the x direction. tan(theta)*cos(phi) Polar angle theta and azimuthal angle phi describes skewness of the line joining centers of the top and bottom parallelograms tan(theta)*sin(phi)