.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "_gallery/feature_demo/volume_slice2.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

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

        :ref:`Go to the end <sphx_glr_download__gallery_feature_demo_volume_slice2.py>`
        to download the full example code.

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

.. _sphx_glr__gallery_feature_demo_volume_slice2.py:


Volume Slice 2
==============

Render slices through a volume, by creating a 3D texture, and sampling onto
a plane geometry. Simple, fast and subpixel!

.. GENERATED FROM PYTHON SOURCE LINES 8-50



.. image-sg:: /_gallery/feature_demo/images/sphx_glr_volume_slice2_001.webp
   :alt: volume slice2
   :srcset: /_gallery/feature_demo/images/sphx_glr_volume_slice2_001.webp
   :class: sphx-glr-single-img





.. code-block:: Python



    import imageio.v3 as iio
    import numpy as np
    from rendercanvas.auto import RenderCanvas, loop
    import pygfx as gfx


    canvas = RenderCanvas()
    renderer = gfx.renderers.WgpuRenderer(canvas)
    scene = gfx.Scene()

    vol = iio.imread("imageio:stent.npz").astype("float32") / 2000
    nslices = vol.shape[0]
    index = nslices // 2

    tex = gfx.Texture(vol, dim=3)

    geometry = gfx.plane_geometry(200, 200, 1, 1)
    texcoords = np.hstack([geometry.texcoords.data, np.ones((4, 1), np.float32) * 0.5])
    geometry.texcoords = gfx.Buffer(texcoords)

    material = gfx.MeshBasicMaterial(map=tex)
    plane = gfx.Mesh(geometry, material)
    scene.add(plane)

    camera = gfx.OrthographicCamera(200, 200)


    @renderer.add_event_handler("wheel")
    def handle_event(event):
        global index
        index = index + event.dy / 90
        index = max(0, min(nslices - 1, index))
        geometry.texcoords.data[:, 2] = index / nslices
        geometry.texcoords.update_full()
        canvas.request_draw()


    if __name__ == "__main__":
        canvas.request_draw(lambda: renderer.render(scene, camera))
        loop.run()


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

   **Total running time of the script:** (0 minutes 0.364 seconds)


.. _sphx_glr_download__gallery_feature_demo_volume_slice2.py:

.. only:: html

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

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

      :download:`Download Jupyter notebook: volume_slice2.ipynb <volume_slice2.ipynb>`

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

      :download:`Download Python source code: volume_slice2.py <volume_slice2.py>`

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

      :download:`Download zipped: volume_slice2.zip <volume_slice2.zip>`


.. only:: html

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

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

.. only:: html

    Interactive example
    -------------------

    Try this example in your browser using Pyodide. Might not work with all examples and all devices. Check the output and your browser's console for details.

    .. raw:: html

        <iframe src="./../pyodide.html#volume_slice2.py"></iframe>