.. role:: blue
   :class: blue


MbWireFrame Wireframe
=====================
.. _MbWireFrame_Wireframe_:


.. kernel version: 


The :blue:`MbWireFrame` class is declared in the *wire_frame.h* file.

The :blue:`MbWireFrame` wireframe is derived from the
:ref:`MbItem <MbItem_Geometric_Model_Object_>` class and is described by
a set of edges
std::vector< :ref:`MbEdge <MbEdge_Edge_>` * > **edges**,
the number of connected parts *parts*, and the flag indicating the
absence of boundary vertices *closed*.

A wireframe is a set of edges that are joined to each other at vertices
and describe the frame structure of the modeled object. A wireframe may
describe one or several connected sets of points. The number of connected
parts *parts* indicates whether the frame describes a single connected
set of points or whether the frame describes several connected sets of
points and can be split into several wireframes.

Depending on whether boundary vertices are absent or present, a wireframe
will be called *closed* or *open*. Fig. 1 shows a closed wireframe.

.. figure:: /MODELER/OBJECTS_OF_GEOMETRIC_MODEL/pictures/O.8.3.1.png
   :width: 12cm
   :align: center

   Fig. 1

An open wireframe is shown in Fig. 2.

.. figure:: /MODELER/OBJECTS_OF_GEOMETRIC_MODEL/pictures/O.8.3.2.png
   :width: 12cm
   :align: center

   Fig. 2

Fig. 3 shows an open wireframe consisting of
two connected sets of edges:

.. figure:: /MODELER/OBJECTS_OF_GEOMETRIC_MODEL/pictures/O.8.3.3.png
   :width: 12cm
   :align: center

   Fig. 3

Fig. 4 shows a closed wireframe consisting of two
connected sets of edges:

.. figure:: /MODELER/OBJECTS_OF_GEOMETRIC_MODEL/pictures/O.8.3.4.png
   :width: 12cm
   :align: center

   Fig. 4

A wireframe can be used for constructing trajectories,
spatial sketches, and for auxiliary constructions.