Pixar Universal Scene Description (USD)


What Is Universal Scene Description?


Universal Scene Description (USD) is an easily extensible, open-source 3D scene description and file format developed by Pixar for content creation and interchange among different tools. As a result of its power and versatility, it’s being widely adopted, not only in the visual effects community, but also in architecture, design, robotics, manufacturing, and other disciplines.



Pixar Universal Scene Description (USD)



USD at NVIDIA


USD is the foundation for NVIDIA Omniverse™, a live collaborative platform that connects a wide variety of content creation tools to each other and to our real-time NVIDIA RTX™ ray tracer. Learn more about NVIDIA Omniverse and sign up for updates here.

NVIDIA has expanded upon USD by developing new tools, integrating technologies and providing samples and tutorials.


Showcase piece created by NVIDIA to illustrate the power of RTX on the Omniverse Platform. Marbles was created by a distributed team of artists and engineers in Omniverse, assembling VFX+ quality USD assets into a fully physically simulated game level. Marbles runs on a single Quadro RTX 8000 simulating complex physics in a real-time ray traced world.

Learn more about USD's history and how we use it ourselved at NVIDIA: To 3D and Beyond: Pixar’s USD Coming to an Industry Near You


USD Pre-built Libraries and Tools


Video Tutorials


 USD Tutorials and Examples for video above



USD Sample Assets

Marbles USD sample scene


NVIDIA Marbles Sample
USD scene with MDL materials rendered in Omniverse USD scene with MDL materials rendered in Omniverse


NVIDIA USD Attic Sample
Creative Commons License
This work is licensed under a
Creative Commons Attribution 4.0 International License.

Download
USD sample scene


PIXAR Kitchen Set

You will need to review and accept Pixar’s license agreement before downloading the file.


Download from PIXAR

Getting Started with USD

NVIDIA Tutorials and Notes

These tutorials will help Python developers new to USD learn how to perform common tasks on the scene graph, as well as learn how to be more proficient with the USD documentation.

USD and Hydra Resources


 

Pixar's USD Documentation

 

Glossary of USD Terminology

 

[Siggraph 2019] Rob Stauffer’s video introduction to USD

 

[Siggraph 2019] Pixar overview of USD and Hydra

 

[Colin Kennedy] USD-Cookbook

 

[vfxpro99] Help with building USD

 

[vfxpro99] USD Resources

 

[Before & Afters] USD: What it is and why it matters

 

[Before & Afters] How does USD actually get used at a VFX studio?

 

[GTC 2015] Hydra presentation by Jeremy Cowles


Material Definition Language (MDL) Schema

USD is agnostic about the way material properties are represented. At NVIDIA, we believe artists should be able to author materials for cinema-quality rendering and have an automated process that produces simpler but still high-quality shaders in real time.


To achieve this, NVIDIA has developed MDL, an open-source, GPU-friendly Material Definition Language with an associated distiller that simplifies shaders for preview and virtual reality (VR) applications. The NVIDIA MDL SDK has been adopted by many application developers, including Adobe®, Allegorithmic, and Epic’s Unreal Studio.

To facilitate its use, we’ve created a specification (MDL Schema) for referencing MDL in USD and have developed Omniverse plug-ins to facilitate MDL-based workflows. MDL enjoys wide and increasing adoption in the design, visual effects, and gaming industries, among others.

MDL material examples

Additional Resources