Extrude Trim#

Extrude a pyvista.PolyData with a pyvista.Plane() using extrude_trim().

import pyvista as pv

Generate an Extruded Surface#

# Create surface and plane
mesh = pv.ParametricRandomHills(randomseed=2)
plane = pv.Plane(
    center=(mesh.center[0], mesh.center[1], -5),
    direction=(0, 0, -1),
    i_size=30,
    j_size=30,
)

# Perform the extrude trim
extruded_hills = mesh.extrude_trim((0, 0, -1.0), plane)
extruded_hills
PolyDataInformation
N Cells39600
N Points20000
N Strips0
X Bounds-1.000e+01, 1.000e+01
Y Bounds-5.936e-07, 2.000e+01
Z Bounds-5.000e+00, 7.725e+00
N Arrays0


Plot the Extruded Surface#

Plot the resulting pyvista.PolyData.

pl = pv.Plotter(shape=(1, 2))
pl.add_mesh(mesh)
pl.add_text('Original Mesh')

pl.subplot(0, 1)
pl.add_mesh(plane, style='wireframe', color='black')
pl.add_mesh(extruded_hills)
pl.add_text('Extruded Mesh')

pl.link_views()
pl.camera_position = 'iso'
pl.camera.zoom(1.5)
pl.show()
extrude trim

Extruding All Edges#

The previous example used the default extrusion='boundary_edges', which only generates faces on the boundary. When using extrusion='all_edges', interior edges are also created.

# Create a triangle.
disc = pv.Disc(c_res=3, r_res=4, inner=0)
plane = pv.Plane(
    center=(disc.center[0], disc.center[1], -1),
    direction=(0, 0, -1),
    i_size=1,
    j_size=1,
)

# extrude with and without the all_edges option
extruded_disc = disc.extrude_trim((0, 0, -1.0), plane)
extruded_disc_all = disc.extrude_trim((0, 0, -1.0), plane, extrusion='all_edges')
print(f'Extrusion has {extruded_disc.n_faces} faces with default boundary_edges')
print(f'Extrusion has {extruded_disc_all.n_faces} faces with all_edges')
Extrusion has 30 faces with default boundary_edges
Extrusion has 72 faces with all_edges

Plot#

Show the additional interior faces by plotting with style='wireframe'.

pl = pv.Plotter(shape=(1, 2))
pl.add_mesh(extruded_disc, style='wireframe', line_width=5)
pl.add_text('Extrude with boundary_edges')

pl.subplot(0, 1)
pl.add_mesh(extruded_disc_all, style='wireframe', line_width=5)
pl.add_text('Extrude with all_edges')

pl.link_views()
pl.camera_position = 'iso'
pl.camera.zoom(1.3)
pl.show()
extrude trim

Extrude a Line#

You can also extrude lines. Observe that the output from extruded lines is still a pyvista.PolyData.

plane = pv.Plane(center=(0, 0, 1), i_size=2, j_size=0.2, direction=[1, 1, 1], j_resolution=1)
line = pv.Line()
extruded_line = line.extrude_trim((0, 0, 1), plane)
extruded_line
HeaderData Arrays
PolyDataInformation
N Cells1
N Points4
N Strips0
X Bounds-5.000e-01, 5.000e-01
Y Bounds0.000e+00, 0.000e+00
Z Bounds0.000e+00, 1.500e+00
N Arrays2
NameFieldTypeN CompMinMax
Texture CoordinatesPointsfloat3220.000e+001.000e+00
DistancePointsfloat6410.000e+001.000e+00


Plot the Extruded Line#

Note how the scalars are copied to the extruded line.

pl = pv.Plotter()
pl.add_mesh(line, style='wireframe', line_width=20, show_scalar_bar=False, color='r')
pl.add_mesh(plane, style='wireframe', color='black', show_scalar_bar=False)
pl.add_mesh(extruded_line, show_scalar_bar=False, lighting=False)
pl.show()
extrude trim

Total running time of the script: ( 0 minutes 0.915 seconds)

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