PreProConvert

Convert Alembic, USD, and Maya files to multiple formats via a web interface.

Supported Formats

Input:

• Alembic (.abc)
• USD (.usd, .usda, .usdc)
• Maya ASCII (.ma)

Output:

• After Effects (.jsx, .obj)
• USD (.usdc)
• Maya MA (.ma)
• FBX (.fbx)

Running Locally

Requires native VFX libraries (PyAlembic, imath). Use Docker for easiest setup.

With Docker

docker build -t preproconvert .
docker run -p 8000:8000 preproconvert

Then open http://localhost:8000

Without Docker

Requires PyAlembic and imath installed on your system.

python -m venv venv
source venv/bin/activate
pip install -r requirements.txt
uvicorn web.app:app --host 0.0.0.0 --port 8000

Deployment

Railway (recommended)

1. Push to GitHub
2. Connect repo at railway.app
3. Railway auto-detects Dockerfile and deploys

Other Docker-compatible hosts

Any platform supporting Docker deployments will work (Fly.io, AWS ECS, Google Cloud Run, etc.)

API Endpoints

Method	Endpoint	Description
POST	/api/upload	Upload a scene file
GET	/api/jobs/{id}	Get job status
POST	/api/jobs/{id}/convert	Start conversion
GET	/api/jobs/{id}/progress	SSE progress stream
GET	/api/jobs/{id}/download	Download results (ZIP)
DELETE	/api/jobs/{id}	Delete job
GET	/api/formats	List supported formats