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

    Click :ref:`here <sphx_glr_download_auto_tutorials_04_shaders_viz_sdfactor.py>` to download the full example code
.. rst-class:: sphx-glr-example-title

.. _sphx_glr_auto_tutorials_04_shaders_viz_sdfactor.py:


===================
Visualize SDF Actor
===================
Here is a simple tutorial that shows how to visualize SDF primitives using
FURY.

SDFs or Signed-distance functions when passed the coordinates of a point in
space, return the shortest distance between that point and some surface.
This property of SDFs can be used to model 3D geometry at a faster rate
compared to traditional polygons based modeling.

In this example we use the raymarching algorithm to render the SDF primitives
shapes using shaders


.. code-block:: default


    import numpy as np
    from fury import window, actor







Lets define variables for the SDF Actor


.. code-block:: default


    dirs = np.random.rand(3, 3)
    colors = np.random.rand(3, 3) * 255
    centers = np.array([[1, 0, 0], [0, 0, 0], [-1, 0, 0]])
    scales = np.random.rand(3, 1)








Create SDF Actor


.. code-block:: default


    sdfactor = actor.sdf(centers=centers, directions=dirs, colors=colors,
                         primitives=['sphere', 'torus', 'ellipsoid'],
                         scales=scales)







Create a scene


.. code-block:: default


    scene = window.Scene()
    scene.background((1.0, 0.8, 0.8))
    scene.add(sdfactor)








Show Manager

Since all the elements have been initialised ,we add them to the show
manager.


.. code-block:: default


    current_size = (1024, 720)
    showm = window.ShowManager(scene, size=current_size,
                               title="Visualize SDF Actor")

    interactive = False

    if interactive:
        showm.start()

    window.record(scene, out_path='viz_sdfactor.png', size=current_size)



.. image:: /auto_tutorials/04_shaders/images/sphx_glr_viz_sdfactor_001.png
    :class: sphx-glr-single-img





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

   **Total running time of the script:** ( 0 minutes  0.217 seconds)


.. _sphx_glr_download_auto_tutorials_04_shaders_viz_sdfactor.py:


.. only :: html

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



  .. container:: sphx-glr-download

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



  .. container:: sphx-glr-download

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


.. only:: html

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

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