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

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

.. _sphx_glr__gallery_feature_demo_picking_mesh.py:


Mesh Picking
============

Example showing picking a mesh. Showing two meshes that can be clicked
on. Upon clicking, the vertex closest to the pick location is moved.

Transparent objects can also be picked, but if multiple semi-transparent layers
are visible, its undetermined which is picked.

.. GENERATED FROM PYTHON SOURCE LINES 11-84



.. image-sg:: /_gallery/feature_demo/images/sphx_glr_picking_mesh_001.webp
   :alt: picking mesh
   :srcset: /_gallery/feature_demo/images/sphx_glr_picking_mesh_001.webp
   :class: sphx-glr-single-img





.. code-block:: Python



    # todo: if we have per-vertex coloring, we can paint on the mesh instead :D

    import numpy as np
    import imageio.v3 as iio
    from rendercanvas.auto import RenderCanvas, loop
    import pygfx as gfx
    import pylinalg as la


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

    scene.add(gfx.Background.from_color("#446"))

    im = iio.imread("imageio:astronaut.png").astype(np.float32) / 255
    tex = gfx.Texture(im, dim=2)

    cube = gfx.Mesh(
        gfx.box_geometry(200, 200, 200),
        gfx.MeshBasicMaterial(map=tex, pick_write=True),
    )
    cube.local.x += 150
    scene.add(cube)

    torus = gfx.Mesh(
        gfx.torus_knot_geometry(100, 20, 128, 32), gfx.MeshPhongMaterial(pick_write=True)
    )
    torus.local.x -= 150
    scene.add(torus)

    camera = gfx.PerspectiveCamera(70, 16 / 9)
    camera.show_object(scene)

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


    def distort_geometry(event):
        info = event.pick_info
        if "face_index" in info:
            # Get what face was clicked
            face_index = info["face_index"]
            coords = info["face_coord"]
            # Select which of the three vertices was closest
            # Note that you can also select all vertices for this face,
            # or use the coords to select the closest edge.
            sub_index = np.argmax(coords)
            # Look up the vertex index
            vertex_index = int(event.target.geometry.indices.data[face_index, sub_index])
            # Change the position of that vertex
            pos = event.target.geometry.positions.data[vertex_index]
            pos[:] *= 1.1
            event.target.geometry.positions.update_range(vertex_index, 1)


    torus.add_event_handler(distort_geometry, "pointer_down")
    cube.add_event_handler(distort_geometry, "pointer_down")


    def animate():
        rot = la.quat_from_euler((0.005, 0.01), order="XY")
        cube.local.rotation = la.quat_mul(rot, cube.local.rotation)
        torus.local.rotation = la.quat_mul(rot, torus.local.rotation)

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


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


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

   **Total running time of the script:** (0 minutes 0.526 seconds)


.. _sphx_glr_download__gallery_feature_demo_picking_mesh.py:

.. only:: html

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

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

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

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

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

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

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