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

.. only:: html

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

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

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

.. _sphx_glr__gallery_validation_validate_normals_sides.py:


Normals on front and back
=========================

This example validates that normals are handled such that both the front
and back faces are lit. Further it validates the appearance of the
normal lines material.

This shows a flattened cylinder, with normal lines sticking out both
at the front and back faces.

.. GENERATED FROM PYTHON SOURCE LINES 12-52



.. image-sg:: /_gallery/validation/images/sphx_glr_validate_normals_sides_001.webp
   :alt: validate normals sides
   :srcset: /_gallery/validation/images/sphx_glr_validate_normals_sides_001.webp
   :class: sphx-glr-single-img





.. code-block:: Python



    from rendercanvas.auto import RenderCanvas, loop
    import pygfx as gfx
    import pylinalg as la


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

    geo = gfx.cylinder_geometry(radial_segments=16, height_segments=3, open_ended=True)
    ob1 = gfx.Mesh(
        geo,
        gfx.MeshPhongMaterial(color="#f00"),
    )
    ob2 = gfx.Mesh(
        geo,
        gfx.MeshNormalLinesMaterial(color="#0f0", line_length=0.4),
    )
    ob3 = gfx.Mesh(
        geo,
        gfx.MeshNormalLinesMaterial(color="#00f", line_length=-0.2),
    )

    ob1.local.position = (1, 0, 0)
    ob1.local.rotation = la.quat_from_axis_angle((0, 1, 0), 1)
    ob1.local.scale = (3, 1, 1)
    scene.add(ob1.add(ob2, ob3))

    scene.add(gfx.DirectionalLight(), gfx.AmbientLight())

    camera = gfx.PerspectiveCamera(70, 1, depth_range=(0.1, 2000))
    camera.local.z = 4.5

    renderer.request_draw(lambda: renderer.render(scene, camera))


    if __name__ == "__main__":
        print(__doc__)
        loop.run()


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

   **Total running time of the script:** (0 minutes 0.261 seconds)


.. _sphx_glr_download__gallery_validation_validate_normals_sides.py:

.. only:: html

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

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

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

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

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

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

      :download:`Download zipped: validate_normals_sides.zip <validate_normals_sides.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#validate_normals_sides.py"></iframe>