Introduction

USD is a modern composition file format used by 3D workflows. It is increasing being used in engineering/physics applications via NVIDIA Omniverse.

Aims

1. Renderble USD file
2. Direct load to Geant4
3. As similar structure as GDML/G4
4. Dynamic update of boolean/references

Quick build instructions

• clone openusd
  • terminal> git clone https://github.com/PixarAnimationStudios/OpenUSD.git
• clone g4omniverse
  • terminal> git clone https://github.com/g4edge/g4omniverse.git
• Move to openusd directory
  • terminal> cd openusd
• Link g4omniverse schema to extras directory
  • terminal> ln -s ../g4omniverse/schema openusd/extras/g4
• edit extras/CMakeLists.txt to include g4 directory
• build plugin
  • terminal> python build_scripts/build_usd.py ../openusd-build/
• add plugin directory to python path
  • terminal> export $PYTHONPATH=$PYTHONPATH:<PATH_TO_USD_BUILD>/lib/python
• test in python
  • python> from pxr import G4

Regenerate schema

• usdGenSchema g4.schema .