.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "auto_examples\04_demos\viz_ellipsoid_slicer.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

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

        :ref:`Go to the end <sphx_glr_download_auto_examples_04_demos_viz_ellipsoid_slicer.py>`
        to download the full example code.

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_auto_examples_04_demos_viz_ellipsoid_slicer.py:


=======================
Ellipsoid Field Slicing
=======================

Visualize one Z slice of an ellipsoid field. Press Up/Down to move the slice.
Across Z, the longest axes rotate from X (red) to Z (blue).

.. GENERATED FROM PYTHON SOURCE LINES 9-14

.. code-block:: Python


    import numpy as np

    from fury import actor, window








.. GENERATED FROM PYTHON SOURCE LINES 15-16

Define an 8x8x8 field whose first semi-axis grows along Z.

.. GENERATED FROM PYTHON SOURCE LINES 16-28

.. code-block:: Python


    lengths = np.empty((8, 8, 8, 3), dtype=np.float32)
    lengths[..., 0] = np.linspace(0.15, 0.4, 8)
    lengths[..., 1:] = 0.15

    # Each matrix's columns define the glyph axes. Rotate the longest axis from X to Z.
    rotations = np.empty((8, 3, 3), dtype=np.float32)
    for z, angle in enumerate(np.linspace(0, np.pi / 2, 8)):
        cosine, sine = np.cos(angle), np.sin(angle)
        rotations[z] = [[cosine, 0, -sine], [0, 1, 0], [sine, 0, cosine]]
    orientations = np.broadcast_to(rotations, (*lengths.shape[:3], 3, 3))








.. GENERATED FROM PYTHON SOURCE LINES 29-31

Show the central Z plane. Scale only the glyphs; default colors follow their
longest axes, not the slice position or later world transforms.

.. GENERATED FROM PYTHON SOURCE LINES 31-44

.. code-block:: Python


    slicer = actor.ellipsoid_slicer(
        lengths,
        orientation_matrices=orientations,
        scale=0.8,
        visibility=(False, False, True),
    )
    scene = window.Scene()
    scene.add(slicer)
    show_manager = window.ShowManager(
        scene=scene, size=(800, 600), title="Ellipsoid Slicer (Up, Down - Z slice)"
    )








.. GENERATED FROM PYTHON SOURCE LINES 45-47

Use the same slice controls as the vector-field tutorial. Positions are clamped
to the field bounds; other keys leave the slice unchanged.

.. GENERATED FROM PYTHON SOURCE LINES 47-61

.. code-block:: Python



    def handle_key_event(event):
        if event.key not in ("ArrowUp", "ArrowDown"):
            return
        x, y, z = actor.get_slices(slicer)
        step = 1 if event.key == "ArrowUp" else -1
        actor.show_slices(slicer, (x, y, z + step))
        show_manager.render()


    show_manager.renderer.add_event_handler(handle_key_event, "key_down")

    show_manager.start()



.. image-sg:: /auto_examples/04_demos/images/sphx_glr_viz_ellipsoid_slicer_001.png
   :alt: viz ellipsoid slicer
   :srcset: /auto_examples/04_demos/images/sphx_glr_viz_ellipsoid_slicer_001.png
   :class: sphx-glr-single-img






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

   **Total running time of the script:** (0 minutes 0.145 seconds)


.. _sphx_glr_download_auto_examples_04_demos_viz_ellipsoid_slicer.py:

.. only:: html

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

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

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

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

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

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: viz_ellipsoid_slicer.zip <viz_ellipsoid_slicer.zip>`


.. only:: html

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

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