How to draw a 3D sphere?

[KmolYuan]

How can I use SurfaceSeries to draw spheres from a given u, v mesh grid?

Matplotlib gives:

import numpy as np
import matplotlib.pyplot as plt

PI = np.pi
TAU = 2 * PI

u, v = np.mgrid[0:TAU:20j, 0:PI:10j]
x = np.cos(u) * np.sin(v)
y = np.sin(u) * np.sin(v)
z = np.cos(v)

fig = plt.figure()
ax = fig.gca(projection='3d')
ax.set_aspect("equal")
ax.plot_wireframe(x, y, z, color="r")

[KmolYuan]

Alternative plan: Use spherical mesh.

// sr = the radius of the sphere
// Draw the sphere
{
    let t = (0..=500).map(|t| t as f64 / 500. * TAU);
    let z = t.clone().map(|t| sr * t.cos());
    let y = t.map(|t| sr * t.sin());
    const N: usize = 96;
    for i in 0..N {
        let phi = i as f64 / N as f64 * TAU;
        let x = z.clone().map(|z| z * phi.sin());
        let z = z.clone().map(|z| z * phi.cos());
        let iter = x.zip(y.clone()).zip(z).map(|((x, y), z)| (x, y, z));
        chart.draw_series(LineSeries::new(iter, BLACK.mix(0.1)))?;
    }
}