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Only one coating is allowed per BSDF. It’s possible to make a material using just a coating and no BSDF, for example to create a bubble material. See the tutorial section how to do this.
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The coating component has the following parameters: - Enabled: enables / disables visibility of the component.
- Name: name of the Coating component.
- Thickness: specifies the thickness of the coating component. Can be specified by a numerical value or through a weight map. To avoid interference coloring, higher thickness values (such as 1 mm = 1000000 nm) should be used.
- Min / Max: specifies the minimum and maximum value of the thickness used with a thickness map only. The thickness map will be treated as a grayscale map using the given range.
- Use IOR: allows users to set the value of the index of refraction (Nd) manually.
- IOR File: specifies an .ior file which provides Maxwell Render with the exact index or refraction for each wavelength of a material. These materials have the advantage of being extremely realistic, but complex IOR data requires more complex mathematical functions.
- Reflectance (0°): specifies the light reflected by the material, when the object is seen at 0° degrees (frontal view).
- Reflectance (90°): specifies the light reflected by the material when the object is seen at 90° degrees (glancing angle).
- Nd: specifies the overall reflectivity of the object (IOR: index of refraction). With transparent materials the Nd also controls the amount of refraction.
- Force Fresnel: specifies behaviour of the reflectance between 0° and 90° (the Fresnel curve).
- K (extinction coefficient): specifies the amount of absorption loss when an electromagnetic wave propagates through a material. This coefficient plays role in the calculation of the refraction at a particular wavelength.
- Use R2: gives controls over the falloff between the 0° and the 90° color.
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