2D Domino Cascade: Winding-Path Toppling Physics

Most domino simulators only let you push the very first piece. This 2D top-down cascade instead lays dominoes along a fixed winding path and lets you click any standing domino to set off the chain reaction from that exact point, propagating forward along the curve. Each domino is modeled as a rigid rod pivoting about its base, driven by the real falling-rod torque equation α = (3g)/(2H)·sinθ, and only topples its neighbor once its top edge — reaching forward a horizontal distance H·sinθ along the path's own tangent direction — physically closes the spacing gap ahead of it. Because the view is from above, a standing domino renders as a thin rectangle crossing the path and a fallen one as a full-length rectangle lying flat along it, so the footprint growth you see on screen is the same sinθ term driving the physics underneath. Push the spacing slider past the domino's own height and the cascade stalls partway down that stretch of path, exactly like the physics predicts, while the size slider trades off toppling speed against the energy each domino releases as it falls.