[Doc] Add note about axis interpretation in grid documentation

parent c92becdd
......@@ -6,8 +6,7 @@ and :doc:`parameterizations <parameter-file>` must exactly map to grid
boundary faces and grid cells, respectively. DORiE therefore not only requires
a specification of the actual grid, but also of these mappings.
DORiE supports two types of grid input, which are controlled via the config
file parameter ``grid.gridType``:
DORiE supports two types of grid input, which are controlled via the :doc:`configuration file <config-file>` parameter ``grid.gridType``:
1. Building a rectangular grid on the fly (``rectangular``).
Depending on whether grid adaptivity is enabled or not, DORiE will use
......@@ -23,6 +22,15 @@ file parameter ``grid.gridType``:
The mapping is read from this file and must be considered when
:ref:`building the mesh <man-grid_gmsh>`.
.. note::
The point of origin in DORiE's
reference frame is located at the lower left (front) point of the domain.
In 2D, the :math:`x`-direction points to the right, and the
:math:`y`-direction upwards. In 3D, the :math:`x`-direction points to
the right, the :math:`y`-direction points backwards, and the
:math:`z`-direction points upwards. Notice that DORiE does not support
negative coordinates!
.. _man-grid_mapping-dataset:
......
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