.. DO NOT EDIT. .. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY. .. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE: .. "gallery/scene/mesh_shading.py" .. LINE NUMBERS ARE GIVEN BELOW. .. only:: html .. note:: :class: sphx-glr-download-link-note :ref:`Go to the end ` to download the full example code. .. rst-class:: sphx-glr-example-title .. _sphx_glr_gallery_scene_mesh_shading.py: Shading a Mesh ============== Show mesh filter usage for shading (lighting) a mesh and displaying a wireframe. .. GENERATED FROM PYTHON SOURCE LINES 13-120 .. image-sg:: /gallery/scene/images/sphx_glr_mesh_shading_001.png :alt: mesh shading :srcset: /gallery/scene/images/sphx_glr_mesh_shading_001.png :class: sphx-glr-single-img .. code-block:: Python import argparse from vispy import app, scene from vispy.io import read_mesh, load_data_file from vispy.scene.visuals import Mesh from vispy.scene import transforms from vispy.visuals.filters import ShadingFilter, WireframeFilter parser = argparse.ArgumentParser() default_mesh = load_data_file('orig/triceratops.obj.gz') parser.add_argument('--mesh', default=default_mesh) parser.add_argument('--shininess', default=100) parser.add_argument('--wireframe-width', default=1) args, _ = parser.parse_known_args() vertices, faces, normals, texcoords = read_mesh(args.mesh) canvas = scene.SceneCanvas(keys='interactive', bgcolor='white') view = canvas.central_widget.add_view() view.camera = 'arcball' view.camera.depth_value = 1e3 # Create a colored `MeshVisual`. mesh = Mesh(vertices, faces, color=(.5, .7, .5, 1)) mesh.transform = transforms.MatrixTransform() mesh.transform.rotate(90, (1, 0, 0)) mesh.transform.rotate(-45, (0, 0, 1)) view.add(mesh) # Use filters to affect the rendering of the mesh. wireframe_filter = WireframeFilter(width=args.wireframe_width) # Note: For convenience, this `ShadingFilter` would be created automatically by # the `MeshVisual with, e.g. `mesh = MeshVisual(..., shading='smooth')`. It is # created manually here for demonstration purposes. shading_filter = ShadingFilter(shininess=args.shininess) # The wireframe filter is attached before the shading filter otherwise the # wireframe is not shaded. mesh.attach(wireframe_filter) mesh.attach(shading_filter) def attach_headlight(view): light_dir = (0, 1, 0, 0) 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 shading_filter.light_dir = transform.map(initial_light_dir)[:3] attach_headlight(view) shading_states = ( dict(shading=None), dict(shading='flat'), dict(shading='smooth'), ) shading_state_index = shading_states.index( dict(shading=shading_filter.shading)) wireframe_states = ( dict(wireframe_only=False, faces_only=False,), dict(wireframe_only=True, faces_only=False,), dict(wireframe_only=False, faces_only=True,), ) wireframe_state_index = wireframe_states.index(dict( wireframe_only=wireframe_filter.wireframe_only, faces_only=wireframe_filter.faces_only, )) def cycle_state(states, index): new_index = (index + 1) % len(states) return states[new_index], new_index @canvas.events.key_press.connect def on_key_press(event): global shading_state_index global wireframe_state_index if event.key == 's': state, shading_state_index = cycle_state(shading_states, shading_state_index) for attr, value in state.items(): setattr(shading_filter, attr, value) mesh.update() elif event.key == 'w': wireframe_filter.enabled = not wireframe_filter.enabled mesh.update() elif event.key == 'f': state, wireframe_state_index = cycle_state(wireframe_states, wireframe_state_index) for attr, value in state.items(): setattr(wireframe_filter, attr, value) mesh.update() canvas.show() if __name__ == "__main__": app.run() .. rst-class:: sphx-glr-timing **Total running time of the script:** (0 minutes 0.976 seconds) .. _sphx_glr_download_gallery_scene_mesh_shading.py: .. only:: html .. container:: sphx-glr-footer sphx-glr-footer-example .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: mesh_shading.ipynb ` .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: mesh_shading.py ` .. container:: sphx-glr-download sphx-glr-download-zip :download:`Download zipped: mesh_shading.zip ` .. only:: html .. rst-class:: sphx-glr-signature `Gallery generated by Sphinx-Gallery `_