Zemax User Manual [portable] ✓ ❲Secure❳

This is the most critical starting point. It defines how Zemax handles coordinate systems (Local vs. Global), field of view (FOV) , and wavelength units.

While the software provides presets, the manual provides the mathematical definition of A, B, and g parameters for BRDF/BTDF. zemax user manual

For stray light, illumination, and scattering analysis, the NSC chapter is invaluable. It covers sources, detectors, scattering models (Lambertian, ABg), and splitting/Scattering rays. This is the most critical starting point