V-Ray 8.4 [material reflection]

“Material Reflection Layers”

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V-Ray Version 3.6:

  1. Navigate to the  V-Ray Asset Editor (V-Ray>Asset Editor...) or click the Asset Editor button from the V-Ray toolbar (Shown below).[Premium Content - Login] [Membership Options]
  2. In the Asset Editor window, click to select the material you wish to work with.  Expand the drawer to the right to view details about that material.
  3. Expand the Reflection section.  Find the "Reflection Color" slider.  Change the color (by slider or manually) of the reflection.  (Black or dark colors have low reflection and white or light colors are very reflective.)  You will see a live preview as you adjust this slider. [Premium Content - Login] [Membership Options]
  4. You can adjust the "Reflection Glossiness" value between 0 and 1 to control how sharp the reflection appears.  A value of 1 will be very sharp and a value of 0.5 will be more blurry.  Below are samples with a value of 1 and a value of 0.5 for "Reflection Glossiness." [Premium Content - Login] [Membership Options]
  1. The reflection IOR should be unchecked because it it tied to the refraction IOR.  Adjust the refraction IOR (see below) only, unless you are trying to "fake" the material in a rendering.
    • Note 1: If your material is not transparent, you may be able to save on rendering resources by "faking" the IOR.  In this case, turn off the "Refraction" toggle and check the box next to "Reflection IOR" in the Reflection section and input the desired IOR value. 
    • Note 2: The IOR value is particularly important when rendering transparent or semitransparent materials like glass, please make sure to look up the value and include it.  Please see steps 6-7 below.
  2. Expand the refraction section on the right drawer of the Asset Editor.
  3. Adjust the IOR (Index of Refraction) as appropriate for your desired material.  You may wish to consult this fantastic list of IOR values for various materials.

V-Ray Version 1.5:

  1. Open the Material Editor and select a material you wish to edit.
  2. Right click on the material name and navigate to Create Layer>Reflection.
    • Note: If your material already has a reflection layer, skip to step 3.
  3. Click on the Reflection Options tab and click the “M” next to the Reflection Color.[Premium Content - Login] [Membership Options]
  4. Under the Common section, confirm “Fresnel” is selected (this is correct for everything except mirrors/chrome or other really shiny objects). Click “Apply.”[Premium Content - Login] [Membership Options]
    • Note: Changing the value of the Index of Refraction (IOR) will change the reflective quality of the material. A Fresnel IOR of 2.5 for example will make the material appear more metallic when rendered. Explore changing the IOR to create better rendered materials.
  5. You can also change the value of the Reflection Glossiness down from 1 to 0.5 to make the finish of the material more matte than glossy.
    • Note: Values below 0.5 approximate materials without gloss and are therefore better left without a material reflection layer for faster rendering.


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