The Metal material is a variation of VRay Material | VRayBRDF. For more information and advanced parameter settings, please see the VRay Material page.
Diffuse Color – The diffuse color of the material. Note the actual diffuse color of the surface also depends on the reflection and refraction colors.
Reflection – Specifies the reflection color. Note that the reflection color dims the diffuse surface color based on the Energy preservation option in the advanced settings. For more information, please see theexample below.
IOR – Specifies the 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 will not change direction. For more information, please see the Refraction IOR Parameter example below.
Glossiness – Specifies the sharpness of reflections. This is also called Reflection Glossiness in the advanced settings. A value of 1.0 means perfect mirror-like reflection; lower values produce blurry or glossy reflections. Use the Subdivs parameter in the advanced settings controls the quality of glossy reflections. For more information, please see the Reflection Glossiness Parameter example below.
Bump – Specifies a bump/normal map and controls its intensity.
This example demonstrates how the Reflection parameter controls the reflectivity of the material. Note that this color also acts as a filter for the diffuse color (e.g. stronger reflections dim the diffuse component).
This example demonstrates the effect of the Refraction IOR parameter. Note how light bends more as the IOR deviates from 1.0. When the index of refraction (IOR) is 1.0, the render 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.
This example demonstrates how the glossiness parameter (also known as Reflection glossiness), works with the Highlight glossiness parameter to control the highlights and reflection blurriness of the material.