#### 10.2.2 Outline

• Outline( <liste de facettes> ) or Bord( <liste de facettes> ).
• Description: that function returns the edges list that is building the outline of the object represented by the <facet list>. An edge is itself a list in the form: [point3D1, point3D2, jump] and the imaginary part of the jump constant is $0$ for a hidden edge, or $1$ for a visible edge. An edge is considered as a part of the outline if it belongs to only one facet.