first six rainbow orders.
The sun on the horizon at the base of this all sky
projection centered on the zenith. The left
hand half shows the primary
and secondary bows
and the zero order
glow. The left hand intensity is only 7.5% of that of
the right hand view showing 3rd
to 6th order bows.
The right hand was filtered to remove the lower order
BowSim uses numerical ray tracing to simulate the classical rainbows
from large raindrops.
It is based on the ice halo simulation program HaloSim.
The latter's crystal ray tracing algorithms were replaced by ones
for spheres and general ellipsoids, the latter are useful for simulating
bows from non-spherical drops.
allow half or full screen views where only selected rainbow orders
BowSim was produced by Les Cowley and Michael Schroeder.
BowSim is not available for download.