.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "_gallery/feature_demo/measure_distances_3d.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_measure_distances_3d.py>`
        to download the full example code.

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

.. _sphx_glr__gallery_feature_demo_measure_distances_3d.py:


Measure distances in 3D
=======================

Example to do measurements in a 3D scene. Click on the surface of the
two objects to see the distance betweeen these points.

.. GENERATED FROM PYTHON SOURCE LINES 8-74



.. image-sg:: /_gallery/feature_demo/images/sphx_glr_measure_distances_3d_001.webp
   :alt: measure distances 3d
   :srcset: /_gallery/feature_demo/images/sphx_glr_measure_distances_3d_001.webp
   :class: sphx-glr-single-img





.. code-block:: Python



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


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

    im = iio.imread("imageio:bricks.jpg")
    tex = gfx.Texture(im, dim=2)

    geometry = gfx.torus_knot_geometry(1, 0.3, 128, 32)
    geometry.texcoords.data[:, 0] *= 10  # stretch the texture
    material = gfx.MeshPhongMaterial(map=tex, pick_write=True)

    obj1 = gfx.Mesh(geometry, material)
    obj2 = gfx.Mesh(geometry, material)
    obj1.local.x = -3
    obj2.local.x = 3
    scene.add(obj1, obj2)

    ruler = gfx.Ruler(ticks_at_end_points=True)
    scene.add(ruler)

    camera = gfx.PerspectiveCamera(70, 1)
    camera.show_object(scene)

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

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


    @obj1.add_event_handler("pointer_down")
    @obj2.add_event_handler("pointer_down")
    def handle_clicks(event):
        if event.target is obj1 or event.target is obj2:
            face_index = event.pick_info["face_index"]
            face_coord = event.pick_info["face_coord"]
            vertex_indices = geometry.indices.data[face_index]
            pos = np.sum(
                [
                    geometry.positions.data[i] * w
                    for i, w in zip(vertex_indices, face_coord, strict=True)
                ],
                axis=0,
            )
            pos += event.target.world.position

            if event.target is obj1:
                ruler.start_pos = pos
            else:
                ruler.end_pos = pos


    def animate():
        ruler.update(camera, canvas.get_logical_size())
        renderer.render(scene, camera)


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


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

   **Total running time of the script:** (0 minutes 0.535 seconds)


.. _sphx_glr_download__gallery_feature_demo_measure_distances_3d.py:

.. only:: html

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

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

      :download:`Download Jupyter notebook: measure_distances_3d.ipynb <measure_distances_3d.ipynb>`

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

      :download:`Download Python source code: measure_distances_3d.py <measure_distances_3d.py>`

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

      :download:`Download zipped: measure_distances_3d.zip <measure_distances_3d.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#measure_distances_3d.py"></iframe>