.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "_gallery/feature_demo/pbr2.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_pbr2.py>`
        to download the full example code.

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

.. _sphx_glr__gallery_feature_demo_pbr2.py:


PBR Rendering 2
===============

This example shows the lighting rendering affect of materials with different
metalness and roughness. Every second sphere has an IBL environment map on it.

.. GENERATED FROM PYTHON SOURCE LINES 8-115



.. image-sg:: /_gallery/feature_demo/images/sphx_glr_pbr2_001.webp
   :alt: pbr2
   :srcset: /_gallery/feature_demo/images/sphx_glr_pbr2_001.webp
   :class: sphx-glr-single-img





.. code-block:: Python



    import math
    from time import perf_counter

    import imageio.v3 as iio
    from rendercanvas.auto import RenderCanvas, loop

    import pygfx as gfx
    import pylinalg as la

    # Init
    canvas = RenderCanvas(size=(640, 480), title="gfx_pbr")
    renderer = gfx.renderers.WgpuRenderer(canvas)
    scene = gfx.Scene()

    # Lights
    scene.add(gfx.AmbientLight("#fff", 0.2))
    directional_light = gfx.DirectionalLight("#fff", 3)
    directional_light.local.position = la.vec_normalize((1, 1, 1))
    scene.add(directional_light)
    point_light = gfx.PointLight("#fff", 3)
    scene.add(point_light)
    point_light.add(gfx.PointLightHelper(4))

    # Read cube image and turn it into a 3D image (a 4d array)
    env_img = iio.imread("imageio:meadow_cube.jpg")
    cube_size = env_img.shape[1]
    env_img.shape = 6, cube_size, cube_size, env_img.shape[-1]

    # Create environment map
    env_tex = gfx.Texture(
        env_img, dim=2, size=(cube_size, cube_size, 6), generate_mipmaps=True
    )

    # Apply env map to skybox
    background = gfx.Background(None, gfx.BackgroundSkyboxMaterial(map=env_tex))
    scene.add(background)

    # Now create spheres ...

    cube_width = 400
    numbers_per_side = 5
    sphere_radius = (cube_width / numbers_per_side) * 0.8 * 0.5
    step_size = 1.0 / numbers_per_side

    geometry = gfx.sphere_geometry(sphere_radius, 32, 16)

    index = 0
    alpha = 0.0
    while alpha <= 1.0:
        beta = 0.0
        while beta <= 1.0:
            gamma = 0.0
            while gamma <= 1.0:
                material = gfx.MeshStandardMaterial(
                    color=gfx.Color.from_physical(
                        *gfx.Color.from_hsl(alpha, 0.5, gamma * 0.5 + 0.1)
                    ),
                    metalness=beta,
                    roughness=1.0 - alpha,
                )

                if index % 2 != 0:
                    material.env_map = env_tex

                mesh = gfx.Mesh(geometry, material)

                mesh.local.position = (
                    alpha * 400 - 200,
                    beta * 400 - 200,
                    gamma * 400 - 200,
                )
                scene.add(mesh)
                index += 1

                gamma += step_size
            beta += step_size
        alpha += step_size

    # Create camera and controls
    camera = gfx.PerspectiveCamera(45, 640 / 480)
    camera.show_object(scene, view_dir=(-2, -1.5, -3), scale=1.2)

    controller = gfx.OrbitController(camera, register_events=renderer)

    t0 = perf_counter()


    def animate():
        t = perf_counter() - t0

        t = t * 0.25

        point_light.local.position = (
            math.sin(t * 7) * 300,
            math.cos(t * 5) * 400,
            math.cos(t * 3) * 300,
        )

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


    if __name__ == "__main__":
        renderer.request_draw(animate)
        loop.run()


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

   **Total running time of the script:** (0 minutes 33.156 seconds)


.. _sphx_glr_download__gallery_feature_demo_pbr2.py:

.. only:: html

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

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

      :download:`Download Jupyter notebook: pbr2.ipynb <pbr2.ipynb>`

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

      :download:`Download Python source code: pbr2.py <pbr2.py>`

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

      :download:`Download zipped: pbr2.zip <pbr2.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#pbr2.py"></iframe>