Reflection Color – – The reflection color dims the diffuse surface color.
Amount – A multiplier for the reflection color.
Specular Ramp
This ramp controls the specular color based on the amount of light received. Position 0.0 maps to light intensity 0.0, position 1.0 maps to light intensity 1.0 and above.
Reflection Glossiness – Controls the sharpness of reflections. A value of 1.0 means perfect mirror-like reflection; lower values produce blurry or glossy reflections. Use the Reflection Subdivs parameter below to control the quality of glossy reflections.
Use Fresnel – When enabled, makes the reflection strength dependent on the viewing angle of the surface. Some materials in nature (glass, etc.) reflect light in this manner. Note that the Fresnel effect depends on the index of refraction as well.
Lock Fresnel IOR to Refraction IOR – Allows the user to unlock the Fresnel IOR parameter for finer control over the reflections.
Fresnel IOR – The IOR to use when calculating Fresnel reflections. Normally this is locked to the Refraction IOR parameter, but you can unlock it for finer control.
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Trace Reflections – Check in this option to enable reflections for the material.
Max depth – The number of times a ray can be reflected. Scenes with lots of reflective and refractive surfaces may require higher values to look correct.
Dim distance On – Enables the Dim distance parameter which allows you to stop tracing reflection rays after a certain distance.
Dim distance – Specifies a distance after which the reflection rays will not be traced.
Dim fall off – A fall off radius for the dim distance.
Reflect On Back Side – When disabled, V-Ray calculates reflections for the front side of objects only. Enable it to make V-Ray calculate the reflections for the back sides of objects too.
Affect Channels – Allows the user to specify which channels are going to be affected by the reflectivity of the material.
Color Only – The reflectivity affects only the RGB channel of the final render. Color+alpha – Causes the material to transmit the alpha of the reflected objects, instead of displaying an opaque alpha. All channels – All channels and render elements are affected by the reflectivity of the material.
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Refraction Color – Refraction color. Note that the actual refraction color depends on the reflection color as well.
Amount – This is the amount of the refraction color.
Refraction Glossiness – Controls the sharpness of refractions. A value of 1.0 means perfect glass-like refraction; lower values produce blurry or glossy refractions. Use the Subdivs parameter below to control the quality of glossy refractions.
Refraction IOR – Index of refraction for the material, which describes the way light bends when crossing the material surface. A value of 1.0 means the light does not change direction.
Fog Color – The attenuation of light as it passes through the material. This option helps simulate the fact that thick objects look less transparent than thin objects. Note that the effect of the fog color depends on the absolute size of the objects and is therefore scene-dependent.
Fog Multiplier – The strength of the fog effect. Smaller values reduce the effect of the fog, making the material more transparent. Larger values increase the fog effect, making the material more opaque.
Fog bias – Changes the way the fog color is applied. Negative values make the thin parts of the objects more transparent and the thicker parts more opaque and vice-versa (positive numbers make thinner parts more opaque and thicker parts more transparent).
Affect Shadows – This parameter causes the material to cast transparent shadows to create a simple caustic effect dependant on the refraction color and the fog color.
