The most significant change is the merger of the legacy Material Library with . Previously, Cosmos was for 3D assets (furniture, vegetation, people). Now, it hosts the Material Library as well. This means:
If you prefer the old workflow, the mtllib.exe tool is still available for manual downloads of the legacy library. However, the official Chaos documentation recommends the Cosmos Browser for the most up-to-date and optimized assets. V-Ray Material Library - V-Ray for Rhino - Chaos Docs vray 6 material library
Once downloaded, materials are saved locally on your machine and can be used without an active internet connection. Mastering the V-Ray 6 Material Library: The Ultimate
U/V Repeat for bricks or wood grain.The access method varies slightly, but the UI is identical once open: Override UVWs: Manually add a UVW Map modifier
Starting with V-Ray 6, the standard V-Ray Preset Material Library is officially housed in the Chaos Cosmos Browser .
: The browser consolidates materials with other 3D assets such as furniture, lighting, and vegetation, making it a "one-stop shop" for scene building.
In large-scale scenes, rendering overhead can be prohibitive. The V-Ray Proxy Material allows users to apply materials from the library to proxies (instances of geometry loaded from external files). This feature enables the population of massive environments—such as forests or urban landscapes—with library materials that maintain high detail at close range while optimizing memory usage. The library materials are optimized for this pipeline, supporting level-of-detail (LOD) transitions effectively.