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

.. only:: html

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

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

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

.. _sphx_glr_gallery_scene_volume_rgb.py:


RGB Volume Rendering
====================

Demonstrates rendering a volume with RGB data, where the color is encoded
directly in the data rather than mapped through a colormap.

Three overlapping Gaussian blobs (red, green, blue) are rendered using
different volume rendering methods.

Controls:

* 1  - toggle between volume rendering methods
* 2  - toggle between turntable and arcball cameras

.. GENERATED FROM PYTHON SOURCE LINES 23-86



.. image-sg:: /gallery/scene/images/sphx_glr_volume_rgb_001.png
   :alt: volume rgb
   :srcset: /gallery/scene/images/sphx_glr_volume_rgb_001.png
   :class: sphx-glr-single-img





.. code-block:: Python


    from itertools import cycle

    import numpy as np

    from vispy import app, scene


    def make_rgb_volume(shape=(80, 80, 80)):
        """Create a volume with three colored Gaussian blobs."""
        vol = np.zeros(shape + (3,), dtype=np.float32)
        zz, yy, xx = np.mgrid[:shape[0], :shape[1], :shape[2]]
        cx, cy, cz = [s // 2 for s in shape]
        sigma = min(shape) / 4

        # Red blob offset in +x
        d2 = (xx - cx - 10) ** 2 + (yy - cy) ** 2 + (zz - cz) ** 2
        vol[..., 0] = np.exp(-d2 / (2 * sigma ** 2))

        # Green blob offset in +y
        d2 = (xx - cx) ** 2 + (yy - cy - 10) ** 2 + (zz - cz) ** 2
        vol[..., 1] = np.exp(-d2 / (2 * sigma ** 2))

        # Blue blob offset in +z
        d2 = (xx - cx) ** 2 + (yy - cy) ** 2 + (zz - cz - 10) ** 2
        vol[..., 2] = np.exp(-d2 / (2 * sigma ** 2))

        return vol


    vol = make_rgb_volume()

    canvas = scene.SceneCanvas(keys='interactive', size=(800, 600), show=True)
    canvas.measure_fps()

    view = canvas.central_widget.add_view()
    volume = scene.visuals.Volume(vol, parent=view.scene, method='mip')

    cam1 = scene.cameras.TurntableCamera(parent=view.scene, fov=60,
                                         name='Turntable')
    cam2 = scene.cameras.ArcballCamera(parent=view.scene, fov=60,
                                       name='Arcball')
    view.camera = cam1

    methods = cycle(['mip', 'attenuated_mip', 'translucent', 'additive',
                     'average', 'iso'])


    @canvas.events.key_press.connect
    def on_key_press(event):
        if event.text == '1':
            method = next(methods)
            volume.method = method
            print("Render method: %s" % method)
        elif event.text == '2':
            cam_toggle = {cam1: cam2, cam2: cam1}
            view.camera = cam_toggle.get(view.camera, cam1)
            print(view.camera.name + ' camera')


    if __name__ == '__main__':
        print(__doc__)
        app.run()


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

   **Total running time of the script:** (0 minutes 1.000 seconds)


.. _sphx_glr_download_gallery_scene_volume_rgb.py:

.. only:: html

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

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

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

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

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

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

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


.. only:: html

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

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