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37.2.1.2 Constructors and Setting Functions
— Default constructor: void Tetrahedron (void)

Creates an empty Tetrahedron.

— Constructor: void Tetrahedron (const Point& p, const real diameter_of_triangle, [real angle_x = 0, [real angle_y = 0, [real angle_z = 0]]])

Creates a Tetrahedron with its center at the origin. The faces have enclosing circles of diameter diameter_of_triangle. If any of angle_x, angle_y, or angle_z is non-zero, the Tetrahedron is rotated by the amounts specified around the corresponding axes. Finally, if p is not the origin, the Tetrahedron is shifted such that center comes to lie at p.

The center of a Tetrahedron is the intersection of the line segments connecting the vertices with the centers of the opposite faces.

          Tetrahedron t(origin, 3);
          t.draw();


[Figure 187. Not displayed.]

Fig. 187.

          Point P(1, 0, 1);
          Tetrahedron t(P, 2.75, 30, 32.5, 20);
          t.draw();


[Figure 188. Not displayed.]

Fig. 188.

— Setting function: void set (const Point& p, const real diameter_of_triangle, [real angle_x = 0, [real angle_y = 0, [real angle_z = 0]]])

Corresponds to the constructor above.