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"""
.. _extrude_rotate_example:
Extrude Rotation
~~~~~~~~~~~~~~~~
Sweep polygonal data creating "skirt" from free edges and lines, and
lines from vertices using the :meth:`~pyvista.PolyDataFilters.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
# %%
# Plot the extruded line
# ~~~~~~~~~~~~~~~~~~~~~~
# sphinx_gallery_start_ignore
PYVISTA_GALLERY_FORCE_STATIC = True
# sphinx_gallery_end_ignore
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')
# %%
# .. tags:: filter
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