quadros is a Python CLI package for rendering snapshots into checked frame sets and videos. It can run locally, over SSH, inside containers, or from scheduler jobs without copying scripts into case directories. Nek5000 is the format with dedicated support; other VTK-readable formats are supported via PyVista.

Features

• Render one snapshot or a globbed case directory of snapshots (Nek5000 with dedicated support).
• Keep JSON render configs compatible with the original auto_snp workflow.
• Write manifests, logs, events, frames, and encoded movies under a run output directory.
• Inspect render manifests before deleting dense snapshots.
• Extract camera settings from ParaView .pvsm state files.
• Gate NekStab omega-R renders with explicit field aliases and a rebuild hint.

Install

With uv (recommended for local development)

git clone https://github.com/openfluids/quadros.git
cd quadros
uv venv .venv
. .venv/bin/activate
uv pip install -e .
quadros doctor

For development tools and tests:

uv pip install -e . --group dev
python -m pytest

With standard venv + pip

git clone https://github.com/openfluids/quadros.git
cd quadros
python -m venv .venv
. .venv/bin/activate
python -m pip install --upgrade pip
python -m pip install -e .
quadros doctor

For development tools and tests:

python -m pip install -e . pytest build twine
python -m pytest

For a cluster/native rendering setup, see docs/native-stack.md.

CLI

quadros doctor
quadros render snapshot.f00001 --config configs/render_scenes_example.json
quadros render-many --case-dir /path/to/case --pattern 'sphere0.f*' --config render.json
quadros inspect manifest.json
quadros encode --frames frames/ --out movies/movie.mp4
quadros extract-camera qp_comp.pvsm --out camera.json

By default, render outputs are written in loco under SNAPSHOT_PARENT/quadros for render and CASE_DIR/quadros for render-many. Use --out only when you intentionally want a different output root.

--check enables an omega-R preflight gate for configs that declare field_aliases for omR*/omega fields. If the configured payload is absent, the command points the operator to rebuild the NekStab case with ifvox = .true. and mks <CASE>.

Package layout

• src/quadros/ — importable package and public CLI entrypoint.
• configs/ — JSON render config examples compatible with the original workflow.
• slurm/render_snapshots.sbatch — generic Slurm starter template; copy it and add cluster-specific account, partition, module, or container directives as needed.
• tests/ — packaging and CLI smoke tests.
• docs/ — native-stack notes and operating guidance.
• PLAN.md — source migration plan.

Validation

python -m compileall src tests
python -m quadros --help
quadros doctor