Decimating scalp surface

This can be useful to reduce computation time when using a cloud of digitization points for coordinate alignment instead of e.g. EEG-cap positions.

../../_images/sphx_glr_plot_decimate_head_surface_001.png

Out:

1 BEM surfaces found
    Reading a surface...
[done]
    1 BEM surfaces read

# Authors: Denis Engemann <denis.engemann@gmail.com>
#          Alexandre Gramfort <alexandre.gramfort@telecom-paristech.fr>
#
# License: BSD (3-clause)

import mne
from mne.surface import decimate_surface  # noqa

print(__doc__)

path = mne.datasets.sample.data_path()
surf = mne.read_bem_surfaces(path + '/subjects/sample/bem/sample-head.fif')[0]

points, triangles = surf['rr'], surf['tris']

# reduce to 30000 triangles:
points_dec, triangles_dec = decimate_surface(points, triangles,
                                             n_triangles=30000)

from mayavi import mlab  # noqa

head_col = (0.95, 0.83, 0.83)  # light pink

p, t = points_dec, triangles_dec
mlab.triangular_mesh(p[:, 0], p[:, 1], p[:, 2], t, color=head_col)

Total running time of the script: ( 0 minutes 5.221 seconds)

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