Refraction Node

Color Tex – Input slot for color or texture.

Transparency Tex – Input slot for the transparency of the texture.

IOR Tex – Input slot for the IOR of the texture.

Glossiness Tex – Input slot for the glossiness of the texture.

Translucency Tex – The inside color of the texture.

Affect Alpha –

Affect Shadows – When enabled, the material casts transparent shadows that depend on the refraction color and the fog color.

Color – Specifies the color of the material.

Color Tex Mult – A multiplier for the Color Tex parameter.

Cutoff – This is a threshold below which reflections/refractions will not be traced. V-Ray tries to estimate the contribution of reflections/refractions 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.

Dispersion – Allows you to increase or decrease the dispersion effect.

Dispersion On – This option enables the calculation of true light wavelength dispersion.

Exit Color On – If a ray has reached the maximum refraction depth, the ray will be terminated and the exit color returned.

Fog Bias – Bias for the fogging distance.

Fog Color –  The attenuation of light as it passes through the material. 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 Color Mult – A multiplier for the Fog Color parameter.

Fog Emission – Controls the fog emission. You can use this parameter to substitute the ambient illumination inside the fog, instead of using GI.

Glossiness – Controls the glossiness of the material.

Glossiness Tex Mult – A multiplier for the Glossiness parameter.

Imap Color Thresh –

Imap Max Rate –

Imap Min Rate –

Imap Norm Thresh –

Imap Samples –

Interpolation On – Turns caching on. V-Ray can use a caching scheme similar to the irradiance map to speed up rendering of blurry reflections. The options for the interpolation of blurry reflections are also very similar to the options for the irradiance map. Note that it is not recommended to use interpolation for animations, since this may cause severe flickering.

IOR – Specifies the index of refraction for the material. Most water-based materials like skin have IOR of about 1.3.

IOR Tex Mult – A multiplier for the IOR parameter.

Reflect Exit Color – If a ray has reached its maximum reflection depth, this color will be returned without tracing the ray further.

Refract Exit Color – If a ray has reached the maximum refraction depth, the ray will be terminated and the exit color returned.

Scatter Coeff – The amount of scattering inside the object. 0.0 means rays will be scattered in all directions; 1.0 means a ray cannot change its direction inside the sub-surface volume. 

Scatter Direction – Controls the direction of scattering for a ray. 0.0 means a ray can only go forward (away from the surface, inside the object); 0.5 means that a ray has an equal chance of going forward or backward; 1.0 means a ray will be scattered backward (towards the surface, to the outside of the object).

Subdivs – Lower values will render faster, but the result will be more noisy. Higher values take longer, but produce smoother results. This parameter has effect only when the Use Local Subdivs option is enabled from the Global DMC Sampler Settings.

Thickness – This limits the rays that will be traced below the surface. Might be useful if you do not want or do not need to trace the whole sub-surface volume. 

Trace Depth – Represents the maximum number of bounces that will be computed for reflections and refractions. The individual material reflection/refraction depth settings are still considered, so long as they don't exceed the value specified here.

Trace Refractions – If this is off, refractions will not be traced, even if the refraction color is greater than black.

Translucency – The inside color of the material.

Translucency On – Enables the translucency.

Translucency Tex Mult – Multiplier for the Translucency parameter.

Transparency – Specifies the transparency of the material.

Transparency Tex Mult – Multiplier for the Transparency parameter.