String Physics
Verlet integration ropes and strings. Drag any point to feel the weight, tension, and follow-through. Five presets from pendulums to spider webs.
Single rope, weight swings
Click and drag any point on the strings. Watch weight, tension, and follow-through.
Verlet Integration
Position-based physics. No velocity storage — movement emerges from position differences. Stable, simple, elegant.
Constraint Solving
Each frame runs 8 iterations of distance constraints. More iterations = stiffer ropes. Fewer = stretchy, elastic feel.
Tension Visualization
String segments brighten under tension, thin when stretched. The physics is visible in the rendering, not hidden behind it.