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

.. only:: html

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

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

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

.. _sphx_glr_gallery_scene_mesh_texture.py:


Texture Filter on Meshes
========================

Show how to use the texture filter on meshes.

.. GENERATED FROM PYTHON SOURCE LINES 13-81



.. image-sg:: /gallery/scene/images/sphx_glr_mesh_texture_001.png
   :alt: mesh texture
   :srcset: /gallery/scene/images/sphx_glr_mesh_texture_001.png
   :class: sphx-glr-single-img





.. code-block:: Python


    import argparse

    import numpy as np
    from vispy import app, scene
    from vispy.io import imread, load_data_file, read_mesh
    from vispy.scene.visuals import Mesh
    from vispy.scene import transforms
    from vispy.visuals.filters import TextureFilter


    parser = argparse.ArgumentParser()
    parser.add_argument('--shading', default='smooth',
                        choices=['none', 'flat', 'smooth'],
                        help="shading mode")
    args, _ = parser.parse_known_args()

    mesh_path = load_data_file('spot/spot.obj.gz')
    texture_path = load_data_file('spot/spot.png')
    vertices, faces, normals, texcoords = read_mesh(mesh_path)
    texture = np.flipud(imread(texture_path))

    canvas = scene.SceneCanvas(keys='interactive', bgcolor='white',
                               size=(800, 600))
    view = canvas.central_widget.add_view()

    view.camera = 'arcball'
    # Adapt the depth to the scale of the mesh to avoid rendering artefacts.
    view.camera.depth_value = 10 * (vertices.max() - vertices.min())

    shading = None if args.shading == 'none' else args.shading
    mesh = Mesh(vertices, faces, shading=shading, color='white')
    mesh.transform = transforms.MatrixTransform()
    mesh.transform.rotate(90, (1, 0, 0))
    mesh.transform.rotate(135, (0, 0, 1))
    mesh.shading_filter.shininess = 1e+1
    view.add(mesh)

    texture_filter = TextureFilter(texture, texcoords)
    mesh.attach(texture_filter)


    @canvas.events.key_press.connect
    def on_key_press(event):
        if event.key == "t":
            texture_filter.enabled = not texture_filter.enabled
            mesh.update()


    def attach_headlight(mesh, view, canvas):
        light_dir = (0, 1, 0, 0)
        mesh.shading_filter.light_dir = light_dir[:3]
        initial_light_dir = view.camera.transform.imap(light_dir)

        @view.scene.transform.changed.connect
        def on_transform_change(event):
            transform = view.camera.transform
            mesh.shading_filter.light_dir = transform.map(initial_light_dir)[:3]


    attach_headlight(mesh, view, canvas)


    canvas.show()


    if __name__ == "__main__":
        app.run()


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

   **Total running time of the script:** (0 minutes 0.973 seconds)


.. _sphx_glr_download_gallery_scene_mesh_texture.py:

.. only:: html

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

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

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

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

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


.. only:: html

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

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