Composition Basics#

This module introduces you to USD’s composition system - the technology that makes collaborative, non-destructive, and modular 3D workflows possible. Here you’ll discover how to combine, layer, and reference scene elements to build complex projects that scale from individual assets to entire virtual worlds.

What You’ll Learn#

By the end of this module, you’ll be able to:

  • Understand layers and composition - learn how USD combines multiple data sources into unified scenes

  • Navigate strength ordering (LIVRPS) - understand the rules that determine which data takes precedence when conflicts arise

  • Use specifiers effectively - control how prims are interpreted with def, over, and class specifiers

  • Create modular assets with references - build reusable components that can be shared across projects

  • Set default prims - establish clear entry points for your composed assets

  • Implement variant sets - create multiple variations of assets that can be swapped at runtime

Why This Matters#

USD’s composition system is what transforms it from just a 3D file format into a complete collaborative platform. Instead of traditional “destructive” editing where changes overwrite original data, USD enables:

  • Non-Destructive Workflows: Make changes in separate layers without affecting source data

  • Real-Time Collaboration: Multiple artists can work on the same scene simultaneously

  • Asset Reuse: Create once, reference everywhere - from single assets to large assemblies

  • Variant Management: Switch between different versions, LODs, or configurations on demand

  • Scalable Pipelines: Build scenes that can reference thousands of assets efficiently

What’s Next#

After mastering composition basics, we’ll explore techniques like using payloads for performance optimization and specialized workflows for complex production scenarios.