Solid angle of the detector that has been used to measure BRDF data needs to be accessible in the metadata. This should also apply for "assumed" detector solid angles, regarding synthetic BRDF data. In case of primary receiver optics in front of the detector, said solid angle is defined by the optics aperture.
Necessity of stating the receiver/detector solid angle for formatted scattering functions is being directly mentioned in existing standards:
- SEMI ME1392-0116 (2023) - "Guide for angle resolved optical scatter measurements on specular or diffuse surfaces"
- EN ISO 19986:2020 - "Lasers and laser-related equipment - Test method for angle resolved scattering"
Solid angle of the detector that has been used to measure BRDF data needs to be accessible in the metadata. This should also apply for "assumed" detector solid angles, regarding synthetic BRDF data. In case of primary receiver optics in front of the detector, said solid angle is defined by the optics aperture.
Necessity of stating the receiver/detector solid angle for formatted scattering functions is being directly mentioned in existing standards: