When a ray intersects an Uncoated surface, FRED simply calculates the Fresnel reflection and transmission coefficients based on the refractive index change, angle of incidence, and wavelength. Refractive indices can be real (dielectrics) or imaginary (metals). The Uncoated coating type has no user inputs in the definition.
The Uncoated (bare surface with no coating) coating type can be accessed in the following ways: •Open a new coating dialog and select "Uncoated (bare surface with no coating)" as the coating type.
Coatings and raytrace controls In the order of raytrace operations, Coatings are applied after Raytrace Controls, but both are used in conjunction to determine ray propagation. •To continue propagating a reflected ray, both the Raytrace Control and the Coating must allow the reflection. •To continue propagating a transmitted ray, both the Raytrace Control and the Coating must allow the transmission. •Scattered rays are subject to the same limitations. Currently, an absorbing surface cannot generate scattered rays.
Copies between FRED models will always transfer new material and coating information.
Coatings - General Sampled Coating Coatings - Polarizer / Waveplate Coating Coatings - Quarter Wave Single Layer Coatings - Thin Film Layered Coating
For details about Raytrace Controls, select the following link.
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