download_mars_jpg

download_mars_jpg()

Download and return the path of 'mars.jpg'.

Returns

str

Filename of the JPEG.

Examples

Download the Mars JPEG and map it to spherical coordinates on a sphere.

>>> import math
>>> import numpy
>>> import numpy as np
>>> from pyvista import examples
>>> import pyvista

Download the JPEGs and convert the Mars JPEG to a texture.

>>> mars_jpg = examples.download_mars_jpg()
>>> mars_tex = pyvista.read_texture(mars_jpg)
>>> stars_jpg = examples.download_stars_jpg()

Create a sphere mesh and compute the texture coordinates.

>>> sphere = pyvista.Sphere(radius=1, theta_resolution=120, phi_resolution=120,
...                         start_theta=270.001, end_theta=270)
>>> sphere.active_t_coords = numpy.zeros((sphere.points.shape[0], 2))
>>> sphere.active_t_coords[:, 0] = 0.5 + np.arctan2(-sphere.points[:, 0],
...                                                 sphere.points[:, 1])/(2 * math.pi)
>>> sphere.active_t_coords[:, 1] = 0.5 + np.arcsin(sphere.points[:, 2]) / math.pi
>>> sphere.point_data
pyvista DataSetAttributes
Association     : POINT
Active Scalars  : None
Active Vectors  : None
Active Texture  : Texture Coordinates
Active Normals  : Normals
Contains arrays :
    Normals                 float32  (14280, 3)           NORMALS
    Texture Coordinates     float64  (14280, 2)           TCOORDS

Plot with stars in the background.

>>> pl = pyvista.Plotter()
>>> pl.add_background_image(stars_jpg)
>>> _ = pl.add_mesh(sphere, texture=mars_tex)
>>> pl.show()