Hello，
I would like to ask a question like this. How does the RayMan model calculate direct radiation, diffuse radiation, and longwave radiation using global radiation?

I have noticed that in the RayMan model, by inputting the value of global radiation along with other relevant variables (including humidity, wind speed, air temperature, time, etc.), one can obtain the calculations for direct radiation, diffuse radiation, and longwave radiation. How does RayMan perform these calculations? I have not found detailed calculation procedures in the two articles provided on the official website. How can I obtain the detailed calculation formulas or program?

Thank you for your help!