Extrude Rotation

Sweep polygonal data creating “skirt” from free edges and lines, and lines from vertices using the extrude_rotate() filter.

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.

from __future__ import annotations

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

/opt/hostedtoolcache/Python/3.13.3/x64/lib/python3.13/site-packages/pyvista/core/filters/poly_data.py:3702: 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(

Header	Data Arrays
PolyData Information N Cells 2 N Points 33 N Strips 2 X Bounds -1.000e+00, 1.000e+00 Y Bounds -9.511e-01, 9.511e-01 Z Bounds 0.000e+00, 0.000e+00 N Arrays 2	Name Field Type N Comp Min Max Texture Coordinates Points float32 2 0.000e+00 1.000e+00 Distance Points float64 1 0.000e+00 1.000e+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='lightblue', 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='lightblue', show_edges=True)
plotter.add_mesh(
    pyvista.PolyData(poly.points),
    color='red',
    point_size=10,
    render_points_as_spheres=True,
)

plotter.show(cpos='xy')

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='lightblue', show_edges=True)

plotter.show(cpos='zx')

Static Scene

Interactive Scene

/opt/hostedtoolcache/Python/3.13.3/x64/lib/python3.13/site-packages/pyvista/core/filters/poly_data.py:3702: 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(

Tags: filter