.. _example_tmi_model:

Create Model
============

Here, the code **blk3cell.exe** is used to construct a magnetic susceptibility model on the tensor mesh provided. Files relevant to this part of the example are in the sub-folder *create_model*. Before running this example, you may want to do the following:

	- `Download and open the zip folder containing the entire Mag3d example <https://github.com/ubcgif/mag3d/raw/v6/assets/mag3d_v6_tmi_example.zip>`__ (if not done already)
	- Learn how to run :ref:`blk3cell<mag3d_blk3cell>`
	- Learn the format of the input files :ref:`blk3cell.inp<mag3d_blk3cell_input>`


For our example, the input file used to create the susceptibility model is shown below (**blk3cell.inp**)

.. figure:: ../inputfiles/images/create_blk3cell_input.png
     :align: center
     :width: 700


The resulting model shows a more susceptible block (:math:`\kappa` = 0.025 SI) inside a much less susceptible background (:math:`\kappa` = 0.0001 SI).
The locations used to model the data are shown as well.


.. figure:: images/true_model.PNG
     :align: center
     :width: 500