.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        Click :ref:`here <sphx_glr_download_auto_examples_datasets_plot_volume_to_vertex.py>`     to download the full example code
    .. rst-class:: sphx-glr-example-title

    .. _sphx_glr_auto_examples_datasets_plot_volume_to_vertex.py:


==============================
Map from Volume to Vertex Data
==============================

In order to move from Volume data to Vertex data, you start with data from
voxels and then create a cortex.Volume object. Then, you get a mapper to go
between voxels and vertices for the specific subject and transform you are
working with. Pass the voxel volume through the mapper and you get out a
vertex mapping of that data. You can plot both of these as you normally would.



.. rst-class:: sphx-glr-horizontal


    *

      .. image:: /auto_examples/datasets/images/sphx_glr_plot_volume_to_vertex_001.png
          :alt: plot volume to vertex
          :class: sphx-glr-multi-img

    *

      .. image:: /auto_examples/datasets/images/sphx_glr_plot_volume_to_vertex_002.png
          :alt: plot volume to vertex
          :class: sphx-glr-multi-img






.. code-block:: default


    import cortex
    import cortex.polyutils
    import numpy as np
    np.random.seed(1234)
    import matplotlib.pyplot as plt

    subject = 'S1'
    xfm = 'fullhead'

    # First create example voxel data for this subject and transform
    voxel_data = np.random.randn(31, 100, 100)
    voxel_vol = cortex.Volume(voxel_data, subject, xfm)

    # Then we have to get a mapper from voxels to vertices for this transform
    mapper = cortex.get_mapper(subject, xfm, 'line_nearest', recache=True)

    # Just pass the voxel data through the mapper to get vertex data
    vertex_map = mapper(voxel_vol)

    # You can plot both as you would normally plot Volume and Vertex data
    cortex.quickshow(voxel_vol)
    plt.show()
    cortex.quickshow(vertex_map)
    plt.show()


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** ( 0 minutes  6.718 seconds)


.. _sphx_glr_download_auto_examples_datasets_plot_volume_to_vertex.py:


.. only :: html

 .. container:: sphx-glr-footer
    :class: sphx-glr-footer-example



  .. container:: sphx-glr-download sphx-glr-download-python

     :download:`Download Python source code: plot_volume_to_vertex.py <plot_volume_to_vertex.py>`



  .. container:: sphx-glr-download sphx-glr-download-jupyter

     :download:`Download Jupyter notebook: plot_volume_to_vertex.ipynb <plot_volume_to_vertex.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_