[ENH] Cylindrical plot for detectors

[drewejohnson]

SERPENT allows detectors to be defined against cylindrical (r, theta, z) meshes, as well as Cartesian. We should support a simple plot routine for this as well. We may have to refactor our meshPlot to be more specific, i.e. cartPlot, hexPlot, cylPlot.

[MattKrecicki]

I'd be interesting in working on this

[veeshy]

to a future contributor:

matplotlib can project plots to color coordinates so something like

import numpy as np
import matplotlib.pyplot as plt
import serpentTools

det = serpentTools.read("case.i_det0.m")
mesh_det = det['some_cyl_mesh']
actualTallies = mesh_det.tallies

# mesh grid to use with pcolor
phi, r = np.meshgrid(mesh_det.grids['PHI'][:, -1] / 180 * np.pi, mesh_det.grids['R'][:, -1])

fig, ax = plt.subplots(subplot_kw={'projection': 'polar'}, figsize=(8, 8))
c = ax.pcolor(phi, r, actualTallies.T, shading='nearest')
fig.colorbar(c, ax=ax)

# turn off angle axis 
ax.get_xaxis().set_visible(False)

will help this