.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "_gallery/feature_demo/transparency2.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_transparency2.py>`
        to download the full example code.

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

.. _sphx_glr__gallery_feature_demo_transparency2.py:


Transparency 2
==============

Example showing transparency using three orthogonal planes.
This is a bit of an adversarial case because the planes are in
the same position, plus they intersect, so sorting has no effect.
In cases like this, the dither blending is king.

Press space to toggle the order of the planes.
Press 1-4 to select the blending mode.

.. GENERATED FROM PYTHON SOURCE LINES 13-98



.. image-sg:: /_gallery/feature_demo/images/sphx_glr_transparency2_001.webp
   :alt: transparency2
   :srcset: /_gallery/feature_demo/images/sphx_glr_transparency2_001.webp
   :class: sphx-glr-single-img





.. code-block:: Python



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

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

    background = gfx.Background.from_color("#000")

    sphere = gfx.Mesh(gfx.sphere_geometry(10), gfx.MeshPhongMaterial())

    geometry = gfx.plane_geometry(50, 50, 10, 10)

    plane1 = gfx.Mesh(geometry, gfx.MeshBasicMaterial(color="r", opacity=0.2))
    plane2 = gfx.Mesh(geometry, gfx.MeshBasicMaterial(color="g", opacity=0.5))
    plane3 = gfx.Mesh(geometry, gfx.MeshBasicMaterial(color="b", opacity=0.7))

    plane1.local.rotation = la.quat_from_axis_angle((1, 0, 0), 1.571)
    plane2.local.rotation = la.quat_from_axis_angle((0, 1, 0), 1.571)
    plane3.local.rotation = la.quat_from_axis_angle((0, 0, 1), 1.571)

    scene.add(background, plane1, plane2, plane3, sphere)

    camera = gfx.PerspectiveCamera(70, 16 / 9)
    camera.show_object(scene, view_dir=(-1, -2, -3))
    controller = gfx.OrbitController(camera, register_events=renderer)

    scene.add(camera.add(gfx.DirectionalLight()))

    scene_overlay = gfx.Scene()
    blend_text = gfx.Text(
        text=f"alpha_mode: {plane1.material.alpha_mode}",
        anchor="bottom-left",
        material=gfx.TextMaterial(outline_thickness=0.3, aa=True),
    )
    scene_overlay.add(blend_text)

    screen_camera = gfx.ScreenCoordsCamera()


    @renderer.add_event_handler("key_down")
    def handle_event(event):
        canvas.request_draw()
        if event.key == " ":
            print("Rotating scene element order")
            scene.add(scene.children[1])  # skip bg
        elif event.key == ".":
            clr = "#fff" if background.material.color_bottom_left == "#000" else "#000"
            print(f"Changing background color to {clr}")
            background.material.set_colors(clr)
        elif event.key in "1234567":
            m = [
                None,
                "auto",  # 1
                "solid",  # 2
                "blend",  # 3
                "add",  # 4
                "dither",  # 5
                "bayer",  # 6
                "weighted_blend",  # 7
            ]
            alpha_mode = m[int(event.key)]
            for plane in plane1, plane2, plane3:
                plane.material.alpha_mode = alpha_mode
            print("Selecting alpha_mode", alpha_mode)
            blend_text.set_text(f"alpha_mode: {alpha_mode}")
        canvas.request_draw()


    def animate():
        renderer.render(scene, camera, flush=False)
        renderer.render(
            scene_overlay,
            screen_camera,
            flush=True,
        )


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


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

   **Total running time of the script:** (0 minutes 0.187 seconds)


.. _sphx_glr_download__gallery_feature_demo_transparency2.py:

.. only:: html

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

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

      :download:`Download Jupyter notebook: transparency2.ipynb <transparency2.ipynb>`

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

      :download:`Download Python source code: transparency2.py <transparency2.py>`

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

      :download:`Download zipped: transparency2.zip <transparency2.zip>`


.. only:: html

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

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