.. auto-generated by script ../../../../utils/nxdl2rst.py from the NXDL source NXcsg.nxdl.xml

.. index::
    ! NXcsg (contributed definition)
    ! csg (contributed definition)
    see: csg (contributed definition); NXcsg

.. _NXcsg:

=====
NXcsg
=====

**Status**:

  contributed definition, extends :ref:`NXobject`

**Description**:

  constructive solid geometry NeXus class, using :ref:`NXquadric`
  and :ref:`NXoff_geometry`.

**Symbols**:

  No symbol table

**Groups cited**:
  :ref:`NXcsg`

.. index:: NXcsg (base class); used in contributed definition

**Structure**:

  .. index:: operation (field)

  **operation**: (required) :ref:`NX_CHAR <NX_CHAR>`

    One of the standard construction solid geometry set operations,
    or if the CSG is a pointer to the geometry provided by an
    :ref:`NXquadric` or an :ref:`NXoff_geometry`. Takes values:

    Any of these values:

      * ``UNION``

      * ``INTERSECTION``

      * ``DIFFERENCE``

      * ``COMPLEMENT``

      * ``IS_QUADRIC``

      * ``IS_MESH``


  .. index:: geometry (field)

  **geometry**: (optional) :ref:`NX_CHAR <NX_CHAR>`

    Path to a field that is either an :ref:`NXquadric` (if
    'operation' = IS_QUADRIC) or an :ref:`NXoff_geometry` (if
    'operation' = IS_MESH) that defines the surface making up the
    constructive solid geometry component. Compulsory if 'operation'
    is IS_QUADRIC or IS_MESH.

  **a**: (optional) :ref:`NXcsg`

    The first operand of constructive solid geometry
    operation. Compulsory if 'operation' is UNION, INTERSECTION,
    DIFFERENCE or COMPLEMENT.

  **b**: (optional) :ref:`NXcsg`

    The second operand of constructive solid geometry
    operation. Compulsory if 'operation' is UNION, INTERSECTION or
    DIFFERENCE.

**NXDL Source**:
  https://github.com/nexusformat/definitions/blob/master/contributed_definitions/NXcsg.nxdl.xml