サーフェス内のセルを抽出

別のメッシュの閉じたサーフェスの内側または外側に存在するメッシュ内のセルを抽出する

import pyvista as pv
from pyvista import examples

mesh = examples.download_cow()

cpos = [(13.0, 7.6, -13.85), (0.44, -0.4, -0.37), (-0.28, 0.9, 0.3)]

dargs = dict(show_edges=True)
# Rotate the mesh to have a second mesh
rot = mesh.rotate_y(90, inplace=False)

p = pv.Plotter()
p.add_mesh(mesh, color="Crimson", **dargs)
p.add_mesh(rot, color="mintcream", opacity=0.35, **dargs)
p.camera_position = cpos
p.show()

内側の点を1，外側の点を0でマークします．

select = mesh.select_enclosed_points(rot)

select

Header	Data Arrays
PolyData Information N Cells 3263 N Points 2903 N Strips 0 X Bounds -4.446e+00, 5.998e+00 Y Bounds -3.637e+00, 2.760e+00 Z Bounds -1.701e+00, 1.701e+00 N Arrays 1	Name Field Type N Comp Min Max SelectedPoints Points uint8 1 0.000e+00 1.000e+00

2つのメッシュ，1つは完全に内側，もう1つは完全に外側を抽出します．

inside = select.threshold(0.5)
outside = select.threshold(0.5, invert=True)

結果を表示する

p = pv.Plotter()
p.add_mesh(outside, color="Crimson", **dargs)
p.add_mesh(inside, color="green", **dargs)
p.add_mesh(rot, color="mintcream", opacity=0.35, **dargs)

p.camera_position = cpos
p.show()