+.. |extrusion_btn.icon| image:: images/extrusion_btn.png
Extrusion
=========
+Extrusion feature extrudes selected objects along their normals or the selected axis.
+
+To perform Extrusion in the active part:
+
+#. select in the Main Menu *Features - > Extrusion* item or
+#. click |extrusion_btn.icon| **Extrusion** button in the toolbar
+
+The following property panel will be opened:
.. image:: images/StartSketch.png
:align: center
.. centered::
Start sketch
+There are two variants of the property panel for Extrusion depending on the chosen option:
+
+.. image:: images/extrusion_by_sizes.png
+ :align: left
+**By Sizes** extrudes objects by specifying sizes.
+
+.. image:: images/extrusion_by_bounding_planes.png
+ :align: left
+**By Bounding Faces** extrudes objects by specifying bounding faces/planes and offsets.
+
+
+By sizes
+--------
.. image:: images/Extrusion1.png
:align: center
.. centered::
Extrusion: definition by sizes
+- **Base objects** - contains a list of objects selected in the Object Browser or in the Viewer, which will be extruded.
+- **Axis** - if selected, it will be the direction of extrusion, otherwise objects normals will be used.
+- **To size** - size for extrusion in the direction.
+- **From size** - size for extrusion in the opposite direction.
+
+**TUI Commands**:
+
+.. py:function:: model.addExtrusion(part, objects, size)
+
+ :param part: The current part object.
+ :param list: A list of objects for extrusion.
+ :param number: Size of extrucion.
+ :return: Created object.
+
+.. py:function:: model.addExtrusion(part, objects, direction, size)
+
+ :param part: The current part object.
+ :param list: A list of objects for extrusion.
+ :param object: A direction of extrusion
+ :param number: Size of extrucion.
+ :return: Created object.
+
+.. py:function:: model.addExtrusion(part, objects, toSize, fromSize)
+
+ :param part: The current part object.
+ :param list: A list of objects for extrusion.
+ :param number: "Size to" value.
+ :param number: "Size from" value.
+ :return: Created object.
+
+.. py:function:: model.addExtrusion(part, objects, direction, toSize, fromSize)
+
+ :param part: The current part object.
+ :param list: A list of objects for extrusion.
+ :param object: A direction of extrusion
+ :param number: "Size to" value.
+ :param number: "Size from" value.
+ :return: Created object.
+
+Result
+""""""
+
+The Result of the operation will be an extruded shape:
+
+.. image:: images/extrusion_by_sizes_result.png
+ :align: center
+
+.. centered::
+ **Created Extrusion**
+
+**See Also** a sample TUI Script of :ref:`tui_create_extrusion_by_sizes` operation.
+
+By bounding faces
+------------------
.. image:: images/Extrusion2.png
:align: center
.. centered::
- Extrusion: definition by bounding planes
+ Extrusion: definition by bounding faces
+
+- **Base objects** - contains a list of objects selected in the Object Browser or in the Viewer, which will be extruded.
+- **Axis** if selected, it will be direction of extrusion, otherwise objects normals will be used.
+- **To face** - a face can be selected to bound extrusion from one side.
+- **To offset** - offset for extrusion or for bounding plane, if selected.
+- **From face** - a face can be selected to bound extrusion from the other side.
+- **From offset** - offset for extrusion or for bounding plane, if selected.
+
+Planar face selected as a boundary of extrusion will be enlarged infinitely. As a result, extrusion bounded only by planar faces will be completed always.
+On the other hand, if the boundary face is not planar, extrusion may fail, for example, in case of the base object cannot be projected to this face along given direction.
+
+**TUI Commands**:
+
+.. py:function:: model.addExtrusion(part, objects, toObject, toOffset, fromObject, fromOffset)
+
+ :param part: The current part object.
+ :param list: A list of objects for extrusion.
+ :param object: "To object"
+ :param number: "To offset".
+ :param object: "From object"
+ :param number: "From offset".
+ :return: Created object.
+
+.. py:function:: model.addExtrusion(part, objects, direction, toObject, toOffset, fromObject, fromOffset)
+
+ :param part: The current part object.
+ :param list: A list of objects for extrusion.
+ :param object: A direction of extrusion
+ :param object: "To object"
+ :param number: "To offset".
+ :param object: "From object"
+ :param number: "From offset".
+ :return: Created object.
+
+Result
+""""""
+
+The Result of the operation will be an extruded shape:
+
+.. image:: images/extrusion_by_bounding_planes_result.png
+ :align: center
+
+.. centered::
+ **Created Extrusion**
+
+**See Also** a sample TUI Script of :ref:`tui_create_extrusion_by_bounding_planes` operation.
