Extrude Rotation#

Sweep polygonal data creating “skirt” from free edges and lines, and lines from vertices.

This takes polygonal data as input and generates polygonal data on output. The input dataset is swept around the z-axis to create new polygonal primitives. These primitives form a “skirt” or swept surface. For example, sweeping a line results in a cylindrical shell, and sweeping a circle creates a torus.

import numpy as np

import pyvista

# create a line and rotate it about the Z-axis
resolution = 10
line = pyvista.Line(pointa=(0, 0, 0), pointb=(1, 0, 0), resolution=2)
poly = line.extrude_rotate(resolution=resolution)
poly

Out:

/home/alex/python/pyvista/pyvista/core/filters/poly_data.py:2907: PyvistaFutureWarning: The default value of the ``capping`` keyword argument will change in a future version to ``True`` to match the behavior of VTK. We recommend passing the keyword explicitly to prevent future surprises.
  warnings.warn(
HeaderData Arrays
PolyDataInformation
N Cells2
N Points33
X Bounds-1.000e+00, 1.000e+00
Y Bounds-9.511e-01, 9.511e-01
Z Bounds0.000e+00, 0.000e+00
N Arrays2
NameFieldTypeN CompMinMax
Texture CoordinatesPointsfloat3220.000e+001.000e+00
DistancePointsfloat6410.000e+001.000e+00


Plot the extruded line#

plotter = pyvista.Plotter(shape=(2, 1))
plotter.subplot(0, 0)
plotter.add_text("Line", font_size=24)
plotter.add_mesh(line, color="tan", show_edges=True)
plotter.add_mesh(
    pyvista.PolyData(line.points),
    color="red",
    point_size=10,
    render_points_as_spheres=True,
)
plotter.subplot(1, 0)
plotter.add_text("Extrude Rotated Line", font_size=24)
plotter.add_mesh(poly, color="tan", show_edges=True)
plotter.add_mesh(
    pyvista.PolyData(poly.points),
    color="red",
    point_size=10,
    render_points_as_spheres=True,
)

plotter.show(cpos="xy")
extrude rotate

Create a spring#

# Create the spring profile (a circle).
plotter = pyvista.Plotter()

vertices = np.array(
    [
        [1.0, 0.0, 0.0],
        [1.0732, 0.0, -0.1768],
        [1.25, 0.0, -0.25],
        [1.4268, 0.0, -0.1768],
        [1.5, 0.0, 0.00],
        [1.4268, 0.0, 0.1768],
        [1.25, 0.0, 0.25],
        [1.0732, 0.0, 0.1768],
    ]
)
faces = np.hstack([[8, 0, 1, 2, 3, 4, 5, 6, 7]])
profile = pyvista.PolyData(vertices, faces)

# Extrude the profile to make a spring.
spring = profile.extrude_rotate(resolution=360, translation=6.0, dradius=1.0, angle=2160.0)
plotter.add_text("Spring", font_size=24)
plotter.add_mesh(spring, color="tan", show_edges=True)

plotter.show(cpos="zx")
extrude rotate

Out:

/home/alex/python/pyvista/pyvista/core/filters/poly_data.py:2907: PyvistaFutureWarning: The default value of the ``capping`` keyword argument will change in a future version to ``True`` to match the behavior of VTK. We recommend passing the keyword explicitly to prevent future surprises.
  warnings.warn(

Total running time of the script: ( 0 minutes 0.201 seconds)

Gallery generated by Sphinx-Gallery