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Color – Refraction color. Note that the actual refraction color depends on the Reflection Color as well. For more information, see The Refraction Color Parameter example below. 

Glossiness – Controls the sharpness of refractions. A value of 1.0 means perfect glass-like refraction; lower values produce blurry or glossy refractions. For more information, see The Refraction Glossiness Parameter example below.

Index of Refraction – 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.  For more information, see The Refraction IOR Parameter example below.

Fog ColorDispersion – The attenuation Enables the calculation 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. This parameter can be mapped with a texture. It is recommended that you use a 3D texture for the purpose. For more information, see the Fog Color Parameter example below.  

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. For more information, see The Fog Multiplier Parameter example below.

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).

Dispersion – Enables the calculation of true light wavelength dispersion.

Abberation – Allows the user to increase or decrease the dispersion effect. Lowering it widens the dispersion and vice versa.

Affect Shadows – This parameter causes the material to cast transparent shadows to create a simple caustic effect dependent on the Refraction Color and the Fog Color. For accurate caustic calculations, disable this parameter and instead enable Caustics in the V-Ray Renderer. Simultaneous usage of both Caustics and Affects Shadows can be used for artistic purposes but does not produce a physically correct result.

Thin Walled – (intended for single-surface transparent materials) When enabled and the Translucency Type is set to SSS, it simulates thin translucent surfaces such as soap bubble, leaves, curtains, etc. The SSS Color defines the backside color, while the SSS Amount controls the translucency effect.

Trace Refractions – Enables refractions for the current material.

Use Exit Color – Enables the use of Exit Color.

Exit Color – If a ray has reached it's maximum depth this color is returned instead of tracing the ray further

Max Depth – The number of times a ray can be refracted. Scenes with lots of refractive and reflective surfaces may require higher values to look correct.

Affect Channels – Allows the user to specify which channels are going to be affected by the transparency of the material

Color Only – The transparency affects only the RGB channel of the final render.
Color+Alpha – This causes the material to transmit the alpha of the refracted objects, instead of displaying an opaque alpha. 
All Channels – All channels and render elements are affected by the transparency of the material.

true light wavelength dispersion.

Abberation – Allows the user to increase or decrease the dispersion effect. Lowering it widens the dispersion and vice versa.

Affect Shadows – This parameter causes the material to cast transparent shadows to create a simple caustic effect dependent on the Refraction Color and the Fog Color. For accurate caustic calculations, disable this parameter and instead enable Caustics in the V-Ray Renderer. Simultaneous usage of both Caustics and Affects Shadows can be used for artistic purposes but does not produce a physically correct result.

Thin Walled – (intended for single-surface transparent materials) When enabled and the Translucency Type is set to SSS, it simulates thin translucent surfaces such as soap bubble, leaves, curtains, etc. The SSS Color defines the backside color, while the SSS Amount controls the translucency effect.

Trace Refractions – Enables refractions for the current material.

Use Exit Color – Enables the use of Exit Color.

Exit Color – If a ray has reached it's maximum depth this color is returned instead of tracing the ray further

Max Depth – The number of times a ray can be refracted. Scenes with lots of refractive and reflective surfaces may require higher values to look correct.

Affect Channels – Allows the user to specify which channels are going to be affected by the transparency of the material

Color Only – The transparency affects only the RGB channel of the final render.
Color+Alpha – This causes the material to transmit the alpha of the refracted objects, instead of displaying an opaque alpha. 
All Channels – All channels and render elements are affected by the transparency of the material.

Example: The Refraction

Color Parameter

This example demonstrates the effect of the Refraction glossiness parameter. Note how lower Refraction glossiness values blur the refractions and cause the material to appear as frosted glasscolor parameter to produce glass materials. For the images in this example, the material is with a grey Diffuse color, white Reflection color and Fresnel option on.

Example: The

Refraction IOR Parameter

This example demonstrates the effect of the Fog color parameter. Notice how the thick areas of the object are darker in the two images on the right because of the light absorption of the fog.

Refraction IOR parameter. Note how light bends more as the IOR deviates from 1.0. The case when the index of refraction (IOR) is 1.0 produces a transparent object. Note however, that in the case of transparent objects, it might be better to assign an opacity map to the material, rather than use refraction.

Example: The Refraction Glossiness Parameter

This example demonstrates the effect of the Refraction glossiness parameter. Note how lower Refraction glossiness values blur the refractions and cause the material to appear as frosted glass.