Awesome

Tiny USD

This isn't a tiny re-implementation of USD. This is a tutorial on creating the smallest possible viable USD program from scratch on Windows.

It skips building Hydra, as that introduces significant complexity to the build process.

Prerequisites

• git
• cmake 3.20 or greater installed for the command line
• Visual Studio 2019

Building

Shallow clone the USD dev branch into this project's packages directory:

cd tinyusd
mkdir packages
cd packages
git clone --depth 1 https://github.com/PixarAnimationStudios/USD.git -b dev

Configure USD

Build USD

Let's build USD into a clean installation directory, say /tmp/USD-install

python USD/build_scripts/build_usd.py --no-python --no-tools --no-usdview --draco --materialx /tmp/USD-install

Cherry pick the installation

we're going to copy /tmp/USD-install/plugin/usd/ to /tinyusd-build/bin/usd/ also /tmp/USD-install/resources to tinyusd-build/bin/resources also /tmp/USD-install/bin/*.dll to tinyusd-build/bin also /tmp/USD-install/lib/*.dll to tinyusd-build/bin

TinyUsd

Make sure you have a c:\tmp directory. When you run the program from the tinyusd\build\install\bin directory, it should create a simple USDA file:

c:\tmp\test.usda

The file will look like this:

#usda 1.0

def Cube "Box"
{
    float3 xformOp:scale = (5, 5, 5)
    uniform token[] xformOpOrder = ["xformOp:scale"]
}