USD Validation NVIDIA

An extensible framework to validate OpenUSD assets. Inspired by Pixar's usdchecker, this library extends validation capabilities with additional rules and provides automatic issue fixing.

Features

• Rule-based validation — Modular rule interface with registration mechanism for custom validators
• Flexible engine — Run validation on a Usd.Stage, individual layers, or recursively search folders
• Auto-fixing — Issue fixing interface for applying automated corrections when rules provide suggestions
• Command line interface — Standalone CLI for validation outside of GUI applications
• Lightweight — Pure Python implementation requiring only OpenUSD

Installation

Install from PyPI:

pip install usd-validation-nvidia

Optional Dependencies

For full functionality, install with optional dependencies:

# Include usd-core
pip install usd-validation-nvidia[usd]

# Include NumPy (for optimizations)
pip install usd-validation-nvidia[numpy]

# Install all optional dependencies
pip install usd-validation-nvidia[usd,numpy]

Build from Source

Generate the capabilities package with usd-profiles-nvidia, then build the wheel:

uv run \
  --no-project \
  --with usd-profiles-nvidia==1.15.0 \
  python -m usd_profiles_nvidia.codegen \
    --docs-root specs \
    --destination-dir src \
    --package-name usd_validation_nvidia.capabilities

uv build -o dist

Basic usage

from usd_validation_nvidia import ValidationEngine, IssueFixer

engine = ValidationEngine()
asset = "path/to/asset.usda"
results = engine.validate(asset)

for issue in results.issues():
    print(f"{issue.severity}: {issue.message}")

fixer = IssueFixer(asset)
fix_results = fixer.fix(results.issues())

for result in fix_results:
    print(f"{result.status}: {result.issue.message}")

fixer.save()

The ValidationEngine also supports selecting specific rules with enableRule() / disableRule() and filtering by category with enableCategory().

Command Line Interface

The nvidia_usd_validate command provides validation from the terminal:

# Validate a single file
nvidia_usd_validate asset.usda

# Validate a directory recursively
nvidia_usd_validate ./assets/

# Apply automatic fixes
nvidia_usd_validate --fix asset.usda

# Validate specific categories
nvidia_usd_validate --category Material --category Geometry asset.usda

# Enable specific rules only
nvidia_usd_validate --no-init-rules --rule StageMetadataChecker asset.usda

# Export results to CSV
nvidia_usd_validate --csv-output results.csv asset.usda

# Show help
nvidia_usd_validate --help

AI Coding Agents

The AGENTS.md file and .agents/skills directory contain structured guidance for AI coding agents. Start there for Python project setup, local venv setup, and generated requirement validation workflows.

Documentation

• Full Documentation
• API Reference
• Available Rules

Requirements

• Python 3.10 - 3.12
• OpenUSD 22.11 or later

License

Apache-2.0