This python script and notebook generates sun glitter distribution on Cox-Munk random sea surface slopes. Daughter rays are saved to inspect more details on the scattered daughter rays and intercepted wave facets (if user specifies save_fp in the notebook/command line). Examples of saved daughter rays are provided.
The notebook Cox_Munk_wave.ipynb contains a step-by-step guide and mathematical theory on constructing a random sea surface slope to ray tracing to the simulation of glitter on the cox-munk surface. Do follow this guide for a systematic procedure on sun glitter simulation. The figures and theory in the notebook are obtained from Preisendorfer and Mobley (1985):
Preisendorfer, R. W., & Mobley, C. D. (1985). Unpolarized Irradiance Reflectances and Glitter Patterns of Random Capillary Waves on Lakes and Seas. Monte Carlo Simulation. NOAA Technical Memorandum ERL PMEL-63.
Alternatively, one can also run the python script ray_tracing_utils.py for command-line interface, where user can specify:
--solar_altitude: solar_altitude (angle in deg from the horizontal)--solar_azimuth: solar_azimuth (angle in deg from the i axis (along wind direction))--wind_speed: wind speed in m/s--n: order of hexagonal domain--iter: number of parent rays to seed--save_fp: directory on where to save the daughter rays--camera_altitude: camera_altitude (angle in deg from the horizontal)--camera_azimuth: camera_azimuth (angle in deg from the i axis (along wind direction))'
See -h for help and details on input
Sun glitter distribution at varying solar altitude, azimuth and camera altitude and azimuth.
Wind speed: 1.0 m/s
Wind speed: 5.0 m/s
