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

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

.. _sphx_glr__gallery_feature_demo_point_sprites.py:


Simulating grass with point sprites
===================================

This example simulates a grassy plane, using a technique that early 3D
games used a lot. We create an image with green stripes. Than place a
couple thousand of these in a plane, using a Points object.

.. GENERATED FROM PYTHON SOURCE LINES 9-42



.. image-sg:: /_gallery/feature_demo/images/sphx_glr_point_sprites_001.webp
   :alt: point sprites
   :srcset: /_gallery/feature_demo/images/sphx_glr_point_sprites_001.webp
   :class: sphx-glr-single-img





.. code-block:: Python



    import numpy as np
    import pygfx as gfx


    # Create image of 'grass' (luminance + alpha)
    im = np.zeros((20, 20, 2), np.uint8)
    im[:, :, 0] = 255
    lengths = np.abs(np.random.normal(1, im.shape[1], (im.shape[0],)).astype(np.int32))
    for i, length in enumerate(lengths):
        im[:length, i, 1] = 100 if i % 2 else 20  # alternate high/low alpha

    # Create random positions
    positions = np.random.uniform(0, 100, size=(2000, 3)).astype(np.float32)
    positions[:, 1] = 0

    # Create point sprites
    grasses = gfx.Points(
        gfx.Geometry(positions=positions),
        gfx.PointsSpriteMaterial(
            color="#8F0", sprite=gfx.Texture(im, dim=2), size=3, size_space="world"
        ),
    )

    # Use a camera that is more inside the field, looking from above
    camera = gfx.PerspectiveCamera()
    camera.show_object(grasses, view_dir=(1, -1, 1), scale=0.25)


    if __name__ == "__main__":
        disp = gfx.Display(camera=camera)
        disp.show(grasses)


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

   **Total running time of the script:** (0 minutes 0.599 seconds)


.. _sphx_glr_download__gallery_feature_demo_point_sprites.py:

.. only:: html

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

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

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

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

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

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

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