Merge pull request #25 from Swarali-glitch/patch-1

Create sphere_healpy.md

Author: AdityaJ7

sphere_healpy.md

@@ -0,0 +1,35 @@
+# Plot a sphere and pixel centers on it using Healpix package
+
+*tags:* python, healpix, healpy
+
+### Snippet 
+```
+
+from mayavi import mlab
+import numpy as np
+import healpy as hp
+
+# Create a sphere
+r = 1.0
+pi = np.pi
+cos = np.cos
+sin = np.sin
+phi, theta = np.mgrid[0:pi:101j, 0:2 * pi:101j]
+
+x = r*sin(phi)*cos(theta)
+y = r*sin(phi)*sin(theta)
+z = r*cos(phi)
+
+mlab.figure(1, bgcolor=(1, 1, 1), fgcolor=(0, 0, 0), size=(400, 300))
+mlab.clf()
+
+pix_centers = hp.pix2vec(1, np.arange(12))
+xx, yy, zz = pix_centers
+
+
+mlab.mesh(x , y , z, color=(0.0,0.5,0.5))
+mlab.points3d(xx, yy, zz, scale_factor=0.2)
+
+
+mlab.show()
+```