OpenPBR shading is now available in 3ds Max.
OpenPBR is an open-source shading model jointly developed by Autodesk and Adobe, it is designed as the successor to Autodesk Standard Surface and Adobe Standard Material, offering enhanced functionality and a more user-friendly experience while also enhancing interoperability of materials between different CG software.
The OpenPBR material can be accessed in the Slate and Compact Material Editors. It is supported in the viewport, will render with MAXtoA 5.7.5 (included with 3ds Max 2025.3), and comes with built-in presets of many physically realistic materials.