Rotations

Rotations of a mesh about its axes using rotate_x(), rotate_y(), and rotate_z(). In this model, the x axis is from the left to right; the y axis is from bottom to top; and the z axis emerges from the image. The camera location is the same in all four images.

from __future__ import annotations

import pyvista as pv
from pyvista import examples

Define camera position and axes

Define camera position and axes. Setting axes origin to (3.0, 3.0, 3.0).

mesh = examples.download_cow()
mesh.points /= 1.5  # scale the mesh

cpos = [
    (30.0, 30.0, 30.0),  # position
    (5.0, 5.0, 5.0),  # focal point
    (0.0, 1.0, 0.0),  # view up
]


axes = pv.Axes(show_actor=True, actor_scale=2.0, line_width=5)
axes.origin = (3.0, 3.0, 3.0)

Original Mesh

Plot original mesh. Add axes actor to Plotter.

p = pv.Plotter()

p.add_text('Mesh', font_size=24)
p.add_actor(axes.actor)
p.add_mesh(mesh)

p.show(cpos=cpos)

Static Scene

Interactive Scene

Rotation about the x axis

Plot the mesh rotated about the x axis every 60 degrees. Add the axes actor to the Plotter and set the axes origin to the point of rotation.

p = pv.Plotter()

p.add_text('X-Axis Rotation', font_size=24)
p.add_actor(axes.actor)

for i in range(6):
    rot = mesh.rotate_x(60 * i, point=axes.origin, inplace=False)
    p.add_mesh(rot)

p.show(cpos=cpos)

Static Scene

Interactive Scene

Rotation about the y axis

Plot the mesh rotated about the y axis every 60 degrees. Add the axes actor to the Plotter and set the axes origin to the point of rotation.

p = pv.Plotter()

p.add_text('Y-Axis Rotation', font_size=24)
p.add_actor(axes.actor)

for i in range(6):
    rot = mesh.rotate_y(60 * i, point=axes.origin, inplace=False)
    p.add_mesh(rot)

p.show(cpos=cpos)

Static Scene

Interactive Scene

Rotation about the z axis

Plot the mesh rotated about the z axis every 60 degrees. Add axes actor to the Plotter and set the axes origin to the point of rotation.

p = pv.Plotter()

p.add_text('Z-Axis Rotation', font_size=24)
p.add_actor(axes.actor)

for i in range(6):
    rot = mesh.rotate_z(60 * i, point=axes.origin, inplace=False)
    p.add_mesh(rot)

p.show(cpos=cpos)

Static Scene

Interactive Scene

Rotation about a custom vector

Plot the mesh rotated about a custom vector every 60 degrees. Add the axes actor to the Plotter and set axes origin to the point of rotation.

p = pv.Plotter()

p.add_text('Custom Vector Rotation', font_size=24)
p.add_actor(axes.actor)
for i in range(6):
    rot = mesh.copy()
    rot.rotate_vector(vector=(1, 1, 1), angle=60 * i, point=axes.origin)
    p.add_mesh(rot)

p.show(cpos=cpos)

Static Scene

Interactive Scene

Tags: filter