How to highlight a smooth region on a polygonal mesh

banesullivan · October 3, 2019, 7:34pm

I do not think there is anyway to get around the jagged edges of the selection - even a tube around the feature edges would be jagged.

Here is the best thing I currently can do with PyVista by adding the selection (as an extracted mesh) to the scene with opacity and using SetInterpolationToPhong for smooth shading on that selected mesh:

from pyvista import examples
import pyvista as pv
pv.set_plot_theme('default')

mesh = examples.load_random_hills()

p = pv.Plotter(notebook=False)
p.add_mesh(mesh, color='white')

def overlay(selection):
    p.add_mesh(selection, name='selection', color='lightblue',
               opacity=0.5, smooth_shading=True)
    return

p.enable_cell_picking(mesh=mesh, show=False,
                     callback=overlay)
p.show()