| """ | |
| ====================== | |
| Triangular 3D surfaces | |
| ====================== | |
| Plot a 3D surface with a triangular mesh. | |
| """ | |
| import matplotlib.pyplot as plt | |
| import numpy as np | |
| n_radii = 8 | |
| n_angles = 36 | |
| # Make radii and angles spaces (radius r=0 omitted to eliminate duplication). | |
| radii = np.linspace(0.125, 1.0, n_radii) | |
| angles = np.linspace(0, 2*np.pi, n_angles, endpoint=False)[..., np.newaxis] | |
| # Convert polar (radii, angles) coords to cartesian (x, y) coords. | |
| # (0, 0) is manually added at this stage, so there will be no duplicate | |
| # points in the (x, y) plane. | |
| x = np.append(0, (radii*np.cos(angles)).flatten()) | |
| y = np.append(0, (radii*np.sin(angles)).flatten()) | |
| # Compute z to make the pringle surface. | |
| z = np.sin(-x*y) | |
| ax = plt.figure().add_subplot(projection='3d') | |
| ax.plot_trisurf(x, y, z, linewidth=0.2, antialiased=True) | |
| plt.show() | |