(resources)=
#### Resources

Lists of helpful tutorials.

##### USD Documentation

**Pixar**  
[Pixar Kitchen Set](https://openusd.org/release/dl_kitchen_set.html)

Open USD Glossary of Terms:   
**[openusd.org, Terms and Concepts](https://openusd.org/release/glossary.html)**    

**SideFx (Houdini)**   
**[SideFX, Houdini, USD Basics](https://www.sidefx.com/docs/houdini/solaris/usd.html)**

**Nvidia USD Resources**   
[USD and Hydra Resources](https://developer.nvidia.com/usd#resources)

**Animal Logic**  
[USDBook](https://remedy-entertainment.github.io/USDBook/)
[LIVRPS](https://remedy-entertainment.github.io/USDBook/terminology/LIVRPS.html)
[Composition Arcs](https://remedy-entertainment.github.io/USDBook/terminology/composition_arcs.html)

**Dreamworks**  
[Zero to USD in 80 Days](https://research.dreamworks.com/wp-content/uploads/2020/01/Zero-to-USD-with-notes.pdf)

**USD Working Group**  
[Instancing Explained](https://github.com/usd-wg/assets/blob/main/docs/asset-structure-guidelines.md)

**Colin Kennedy's USD-Cookbook**  
[USD-Cookbook](https://github.com/ColinKennedy/USD-Cookbook/tree/master/plugins/variant_fallbacks)


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#### Github

[Pixar USD examples](https://github.com/PixarAnimationStudios/USD/tree/release/extras/usd/examples/usdObj)

[Weta Digitals USD examples](https://github.com/wetadigital/USDPluginExamples/tree/main/src/usdTriFileFormat)

[Mati's GitHub](https://github.com/matiascodesal/awesome-usd)

[Pappa Chucks Github](https://github.com/boredengineering/Robots_for_Omniverse/tree/go1v2/openUSD_assets/UnitreeRobotics/go1v2)

---

##### Videos


**GM Explores Automated Workflows with USD:**
[GM's GTC on USD](https://www.nvidia.com/en-us/on-demand/session/gtcspring23-s51344/)


**SideFX Primer**: 
[What is USD: A Primer | Rob Stauffer | SIGGRAPH 2019](https://youtu.be/Yp_TRVD3wjQ)

<iframe width="560" height="315" src="https://www.youtube.com/embed/Yp_TRVD3wjQ" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>

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**Omniverse Basics**: [USD Layers in Omniverse | Paul Kind | Nvidia Omniverse, 2023](https://youtu.be/jcLaeVd9qH0)

<iframe width="560" height="315" src="https://www.youtube.com/embed/jcLaeVd9qH0" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>

As demo'd with chess assets.  
**Highlights:**
- To create a layer, click on the "create layer" button and select a location and file name.
- The layer appears in the stack and can be moved around, but is strongest when on top.
- Double-click the layer to set it as the authoring layer, which determines which layer your changes will affect.
- Make changes to the layer as desired by moving things around, adjusting materials, and adding assets.
- Changes are stored in the layer by Deltas or new refs.
- Double-click the root layer to stop editing in the given layer.
- To get rid of changes, disable or remove the layer from the stack.
- Layers are a powerful tool in digital art workflows and offer many advantages.

---

<iframe src="https://player.vimeo.com/video/211022588?h=7d42dc5bbc" width="640" height="360" frameborder="0" allow="autoplay; fullscreen; picture-in-picture" allowfullscreen></iframe>
<p><a href="https://vimeo.com/211022588">USD: Building Asset Pipelines</a> from <a href="https://vimeo.com/user14728591"> Matt Kuruc | Pixar Graphics, ~1997 </a> on <a href="https://vimeo.com">Vimeo</a>.</p>

---

**Nvidia DLI Teaching Kits**: [Omniverse USD Data Modeling | Aaron Luk | Nvidia GTC, Feb 2023](https://www.nvidia.com/en-us/on-demand/session/dliteachingkit-dlitk1017/)

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##### Exercises and DLI Courses

- [USD Playground Documentation](https://wiki.aswf.io/display/WGUSD/USD+Playground)
- [USD Playground Interactive Demo ](https://usd-playground.netlify.app/)

- [Getting Started with USD for Collaborative 3D Workflows, DLI+S-FX-02+V1 ](https://courses.nvidia.com/courses/course-v1:DLI+S-FX-02+V1/)

- [Fundamentals of Universal Scene Description | Jen and Mati, GTC March 2023](https://courses.nvidia.com/courses/course-v1:DLI+X-OV-14+V1/course/)

---

##### Utilities  
[Isaac Unit Converter](https://docs.omniverse.nvidia.com/app_isaacsim/app_isaacsim/ext_omni_isaac_unit_converter.html)  
[USD Book](https://remedy-entertainment.github.io/USDBook/)

---


#### FAQ's and Common Problems

Error: Cannot Nest Gprims: 
**[Do Not Nest Gprims](https://openusd.org/release/glossary.html#usdglossary-gprim)**