how to use decimate function?

[ghazalbangash]

Hi there i want to reduce the triangles of my mesh and tried using decimate function but it doesnt seem to bring any change in the number of cells of my mesh here is my code:

import pyvista as pv   
mesh = pv.read("bunny.stl")
mesh = pv.PolyData(mesh)
p = pv.Plotter()

p.add_mesh(mesh,show_edges=True,color=True)
print(mesh.n_cells)
dec_sphere = mesh.decimate(0.5, volume_preservation=True)
print(mesh.n_cells)

am i using it wrong?cause i have the same issue using subdivide

[akaszynski]

Hello,

There's a minor problem with your example. Since you're not updating the mesh in-place, you have to use the returned value of decimate:

import pyvista as pv
from pyvista import examples
bunny = examples.download_bunny()
dec_bunny = bunny.decimate(0.9)

p = pv.Plotter(shape=(2, 1))
p.add_mesh(bunny, show_edges=True)
p.camera_position = 'xy'
p.camera.zoom(2)
p.subplot(1, 0)
p.add_mesh(dec_bunny, show_edges=True)
p.camera_position = 'xy'
p.camera.zoom(2)
p.show()

[ghazalbangash]

thanks a lot :D