.. role:: blue
   :class: blue


MbPlaneInstance Two-Dimensional Object Insertion
================================================
.. _MbPlaneInstance_Two-Dimensional_Object_Insertion_:


.. kernel version: 


The :blue:`MbPlaneInstanсe` class is declared in the *plane_instanse.h* file.

The :blue:`MbPlaneInstanсe` insertion of two-dimensional objects is derived from the
:ref:`MbItem <MbItem_Geometric_Model_Object_>` class and is described by
a set of two-dimensional geometric objects
std::vector< :ref:`MbPlaneItem <MbPlaneItem_Two-Dimensional_Geometrical_Object_>` > **planeItems** and the local
coordinate system :ref:`MbPlacement3D <MbPlacement3D_Local_Coordinate_System_>` **place**. The two-dimensional objects
are located in the XY plane of the local coordinate system.

The insertion acts as a wrapper for two-dimensional geometric objects,
allowing them to be treated as a geometric model object.
The insertion provides two-dimensional geometric objects with a construction journal
and endows them with attributes and the methods of the geometric model object
:ref:`MbItem <MbItem_Geometric_Model_Object_>`. The insertion of two-dimensional
objects is intended for auxiliary constructions. An insertion of two-dimensional
curves is shown in Fig. 1.

.. figure:: /MODELER/OBJECTS_OF_GEOMETRIC_MODEL/pictures/O.8.9.1.png
   :width: 12cm
   :align: center

   Fig. 1

The insertion of two-dimensional objects may contain a two-dimensional curve
:ref:`MbCurve <MbCurve_Two-Dimensional_Curve_>`, a multiline
:ref:`MbMultiline <MbMultiline_Multiline_>`, or a region
:ref:`MbRegion <MbRegion_Region_>`.