Create Circular Arcs

Generate arc geometry with pyvista.CircularArc() and pyvista.CircularArcFromNormal().

import numpy as np
import pyvista as pv

Create an arc from two endpoints

The first arc is defined directly from its endpoints and center.

arc = pv.CircularArc(
    pointa=(1, 0, 0),
    pointb=(0, 1, 0),
    center=(0, 0, 0),
    resolution=60,
)

pl = pv.Plotter()
pl.add_mesh(arc.tube(radius=0.03), color='royalblue')
pl.add_points(
    arc.points[[0, -1]], color='tomato', point_size=18, render_points_as_spheres=True
)
pl.add_points(
    np.array([[0.0, 0.0, 0.0]]),
    color='black',
    point_size=12,
    render_points_as_spheres=True,
)
pl.show_grid()
pl.view_xy()
pl.show()

Static Scene

Interactive Scene

Create an arc from a normal and angle

Use this form when you already know the plane the arc lies in.

arc_from_normal = pv.CircularArcFromNormal(
    center=(0, 0, 0),
    polar=(1, 0, 0),
    normal=(0, 0, 1),
    angle=120,
    resolution=60,
)

pl = pv.Plotter()
pl.add_mesh(arc_from_normal.tube(radius=0.04), color='seagreen')
pl.add_mesh(pv.Circle(radius=1.0).extract_feature_edges(), color='gray', line_width=2)
pl.show_grid()
pl.view_xy()
pl.show()

Static Scene

Interactive Scene

Tags: load