""" .. _shading_example: Types of Shading ~~~~~~~~~~~~~~~~ Comparison of default, flat shading vs. smooth shading. """ # sphinx_gallery_thumbnail_number = 4 import pyvista as pv from pyvista import examples # %% # PyVista supports two types of shading: flat and smooth shading that uses # VTK's Phong shading algorithm. # # This is a plot with the default flat shading. mesh = examples.load_nut() mesh.plot() # %% # Here's the same sphere with smooth shading. mesh.plot(smooth_shading=True) # %% # Note how smooth shading makes edges that should be sharp look odd, # it's because the points of these normals are averaged between two # faces that have a sharp angle between them. You can avoid this by # enabling ``split_sharp_edges``. # # .. note:: # You can configure the splitting angle with the optional # ``feature_angle`` keyword argument. mesh.plot(smooth_shading=True, split_sharp_edges=True) # %% # We can even plot the edges that will be split using # :func:`extract_feature_edges `. # extract the feature edges exceeding 30 degrees edges = mesh.extract_feature_edges( boundary_edges=False, non_manifold_edges=False, feature_angle=30, manifold_edges=False ) # plot both the edges and the smoothed mesh pl = pv.Plotter() # pl.enable_anti_aliasing() pl.add_mesh(mesh, smooth_shading=True, split_sharp_edges=True) pl.add_mesh(edges, color="k", line_width=5) pl.show() # %% # The ``split_sharp_edges`` keyword argument is compatible with # physically based rendering as well. # plot both the edges and the smoothed mesh pl = pv.Plotter() # pl.enable_anti_aliasing() pl.add_mesh(mesh, color="w", split_sharp_edges=True, pbr=True, metallic=1.0, roughness=0.5) pl.show() # %% # .. raw:: html # # # #

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