Software-rendered, pure C#
Eight exhibits, each solved by a real OnlyCSharp physics kernel and rasterized by a no-GPU software renderer - one directional sun at (0.6, 1.0, 0.4) lighting every surface, and each body projecting its own shadow flat onto the museum floor. No shaders, no game engine you did not write, no stock assets. The clips below are deterministic captures of the exhibits running live.
The floor plan
Every cube you see is a solved simulation element - never a scripted animation.
GerstnerWave
Four trochoidal wave components sum to a closed-form ocean surface on a 26 x 26 grid. Each cube's height is read straight from the kernel; the trough-to-crest navy-to-white tint is the real surface height, not a cosmetic sine.
CombustionModel
An igniter deposits 18 kJ into a fuel block; the rate law k = A·e^(-Ea/RT) then drives thermal runaway to ~2000 K. The block's colour is its live temperature on a black-body ramp - it burns out, cools, and re-fuels on a loop.
SphFluid3D
A weakly-compressible smoothed-particle-hydrodynamics fluid: a water column drops into a tank and settles, each particle solving pressure (stiffness 40), viscosity and gravity every substep at rest density 1000 kg/m³.
SoftBody / XPBD
Position-based dynamics: a banner pinned along its top edge, wired with XPBD structural, shear and bend springs, swings in a time-varying wind field. Every drawn cube sits on one solved cloth node, so the ripple is the particle field itself.
OcRotatingBody + OcGearTrain
A flywheel (I = 2 kg·m²) spins up under 18 N·m and steps down through a 0.4-ratio, 92%-efficient gear to a heavier driven wheel. The solver integrates I·dω/dt = τ_in − τ_load − τ_friction - a real ODE, not a spin animation.
SoftwarePhysics
Nine 0.4 m crates rain from 1.3 m, resolve axis-aligned contacts through sequential-impulse iterations, and settle into a loose stack before the drop resets. Gravity integration and contact solving are the engine's own float-native rigid-body kernel.
GranularColumn
Sand pours onto the apex of a heightfield and avalanches down the flanks through a mass-conserving Gauss-Seidel toppling relaxation, settling into a stable cone at its angle of repose - then flipping like an hourglass so the room never goes still.
Lorentz / EMFormulas
A charge under the Lorentz force F = q(v × B) gyrates in the plane normal to a uniform +Y field while drifting up it, tracing a helix by an energy-conserving Boris push. The electromagnetism leaf supplies the exact gyration rate ω = qB/m and live |F|.
How it renders
The museum draws with a portable software rasterizer: the floor first, then every exhibit's geometry projected flat along the sun direction as a dark ground shadow, then the lit bodies on top. The sun sits at (0.6, 1.0, 0.4) normalized, so shading and shadows agree. Frames were captured deterministically at 320 x 180 - no wall-clock, no random seed - and each exhibit clip is an orbiting camera around a live simulation, exported here as animated GIFs. The physics is never re-implemented for the demo; each exhibit wraps one existing OnlyCSharp kernel and asks it for the truth every frame.