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Color – Specifies – Specifies the color of the coat layer.

Amount – Specifies the thickness amount of the coat layer. A value of 0 does not add a coat layer, while higher values blend the coat gradually.

Glossiness – Controls the glossiness of the coat reflections.

IOR – Specifies the Index of Refraction for the coat layer.

Coat Bump

Mode/Map – Specifies the type of bump map or normal map to apply to the coat layer if a map file is specified.

Bump Map – A height map should be used.

Normal Map – RGB normal map should be used. Note that in most cases the normal map bitmap color space should be set to Linear to ensure correct results.

Local Space Bump – A height map should be used. Unlike the standard Bump mode, in this case the height is not measured in scene units. It is only determined by the raw texture values. Scaling objects will not affect the local space effect. This option has to be selected for the round edges effect (Edges texture used as bump).

Amount – Multiplies the bump map effect. 

Trace Depth – Specifies the maximum number of times a ray is reflected by the material. 

Cutoff – Specifies a threshold below which reflections do not be traced. V-Ray tries to estimate the contribution of reflections to the image, and if it is below this threshold, these effects are not computed. Do not set this to 0.0 as it may cause excessively long render times in some cases.

Base Reflections – When disabled, the base layer only produces specular highlights, but no actual reflections are traced. 

Flake Reflections – When disabled, the flakes only produces specular highlights, but no actual reflections are traced. 

Coat Reflections – When disabled, the coat layer only produces specular highlights, but no actual reflections are traced. 

Image RemovedImage Added

Binding – Enables connection/binding between V-Ray and the corresponding base application material.Color – Enables color binding. Changing the V-Ray material color changes the corresponding base application material color and vice versa.

Texture Mode– Enables texture binding. Changing the V-Ray material texture changes the corresponding base application material texture and vise versa.

Auto – By default binds the Diffuse texture to the base app material. 
Texture Helper – Allows the use of a helper texture as a base application material map. The same helper is used if the binded texture is a procedural map. This is useful if every time you have to set texture placement for a map that can't be displayed accurately in the base app. 
Custom – Allows the use of a custom texture as base application material map.

Selected Bitmap texture is displayed in the viewport and it overrides all other material parameters. The viewport texture does not affect the way the material is rendered with V-Ray. It is mainly used for preview purposes. Keep in mind that procedural textures are not shown in the viewport, however, any Bitmap textures, including ones nested in procedurals, will be automatically displayed.

Disabling this parameter allows changing the base app material texture without affecting the V-Ray material.