Glass Glossy

Color Tex – Specifies the color of the material.

Transparency Tex – Specifies the transparency of the material.

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.

IOR Tex – Index of refraction for the glass. This is ignored if the surface has a volume shader.

Glossiness Tex - Controls the glossiness of the material.

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

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.

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.

Affect Alpha – Allows the user to specify which channels will be affected by the reflection of the material.

Color only – The reflection will affect only the RGB channel of the final render.
Color+alpha – The material will transmit the alpha of the reflected objects instead of displaying an opaque alpha.
All channels – All channels and render elements will be affected by the reflections of the material.

Affect Shadows – This will cause the material to cast transparent shadows, depending on the refraction color and the fog color.

Exit Color On – Enables the following parameters:

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. 

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

Dispersion – This option allows you to increase or decrease the dispersion effect. Lowering it widens the dispersion and vice versa.   

Use Interpolation – 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.

Min Rate –  Determines the resolution for the first interpolation pass. A value of 0 means the resolution will be the same as the resolution of the final rendered image, which will make the interpolation similar to the direct computation method. A value of -1 means the resolution will be half that of the final image and so on.

Max Rate – Determines the resolution of the last interpolation pass.

Samples – The number of samples that will be used to interpolate the blurry reflections at a given point. Larger values tend to blur the detail, although the result will be smoother. Smaller values produce results with more detail, but may produce blotchiness if the Subdivs parameter has been set too low.

Color Thresh – Controls how sensitive the interpolation algorithm is to changes in the color of reflections. Larger values mean less sensitivity and smaller values mean more sensitivity and better results.

Normal Thresh – Controls how sensitive the algorithm is to changes in surface normals and small surface details. Larger values mean less sensitivity; smaller values mean more sensitivity to surface curvature and small details.