Since V-Ray 5, Chaos includes —a separate, free, cloud-based library of materials, HDRIs, and 3D models. Cosmos does not require a paid V-Ray license for basic use (though rendering does require V-Ray). It offers hundreds of free, render-ready materials directly inside Maya via the Cosmos browser.
This is the most common question regarding the . vray material library for maya free download
In Maya, navigate to the V-Ray menu at the top. You will find: V-Ray -> UI -> Asset Browser Since V-Ray 5, Chaos includes —a separate, free,