Reality Sandbox

Every animation here is a real stepped simulation — gravity, collision, fluids, fire, light, and individually-brained AI agents — rendered with a from-scratch, dependency-free engine. Nothing is keyframed except the camera. Click any tile to watch it run live.

A showcase built on the OnlyCSharp 1.9 pure-C# library · scenes transliterated to self-contained WebGL/Canvas · live scenes

Each tile opens a live player. Every scene self-plays on load (its own guarded render(t) loop), so it animates under plain file:// too. The viewer's Pause/Restart/Speed transport additionally drives the scene directly once this is served over http(s):// (same-origin lets it read the iframe). Real physics throughout: SPH & Eulerian fluids, Rankine vortices, impulse rigid bodies, Voronoi fracture, mass-spring cloth/soft-body, RK4 chaos, N-body gravity, blackbody radiation, boids, needs-driven utility-AI brains, and (in the farm sims) real solar-position astronomy for a named site starting 1999-01-01.