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"""
========================
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.
"""
# 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)
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