Runs in your browser through numbl — no install.

A cubed-sphere surfacefun mesh appears in the figure. Drag the Refinement level slider: the page sends the level back to the script, which refines the mesh with surfacefun and returns the new patches — the surface re-renders in place (drag to rotate, scroll to zoom).

A tangent vector field (arrows) is displayed on a sphere. Use the Arrow scale slider to make the arrows larger or smaller — scaling updates instantly in the browser with no round-trip to the script. The field is the tangential projection of a constant vector onto the surface, giving a smooth "wind" pattern.

• refine_demo.m — builds a mesh and hands it to mesh_refiner
• vector_field_demo.m — builds a mesh and vector field; hands them to vector_field_viewer
• mesh_refiner.m / vector_field_viewer.m — open the figure, send data; mesh_refiner also handles slider callbacks
• app/ — a small React/three.js app (built to a single HTML file) that renders the surface and hosts the controls

The figure app detects the data type (data.type === 'vectorfield' vs. plain mesh data) and switches between the refinement panel and the arrow-scale panel.

On every push to main, the deploy workflow builds the app, bundles the project with the numbl browser IDE, and publishes it to GitHub Pages.