pyvista-wasm

PyVista-like API for VTK.wasm — bring intuitive 3D visualization to the browser using WebAssembly.

Try it with JupyterLite	Try it with Stlite	Try it with marimo

Table of Contents
Install
Usage
Presentation
Differences from pyvista-js
Contributing
License

Install

pip install pyvista-wasm

For Pyodide/stlite:

import micropip

await micropip.install("pyvista-wasm")

Usage

import pyvista_wasm as pv

plotter = pv.Plotter()
plotter.add_mesh(pv.Sphere(), color="red")
plotter.show()

Presentation

The PyCon JP 2026 talk introduces pyvista-wasm with live demos and a deep dive into the WASM rendering architecture:

👉 View the slide deck

Differences from pyvista-js

This project replaces the vtk.js rendering backend used in pyvista-js with VTK.wasm (@kitware/vtk-wasm npm package).

Key differences:

Rendering backend: VTK.wasm (WebAssembly port of VTK C++) instead of vtk.js (pure JavaScript reimplementation)
API style: VTK.wasm uses vtk.vtkRenderer() factory functions on a namespace object, vs vtk.js's vtk.Rendering.Core.vtkRenderer.newInstance() hierarchy
Initialization: VTK.wasm requires async initialization via vtkWASM.createNamespace() to load the WASM binary
Feature parity: VTK.wasm provides access to the full VTK C++ API, enabling features not available in vtk.js

Contributing

Contributions are welcome! Please open an issue or pull request on GitHub.

License

Apache License 2.0 © Tetsuo Koyama

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