Interface VerletChainConfig

Verlet integration chain for rope/chain physics.

Usage:

const chain = new VerletChain({
  points: 10,
  segmentLength: 15,
  gravity: 980,
  stiffness: 3,
});
chain.setAnchor(0, playerX, playerY);  // pin first point to player
chain.update(delta);
const points = chain.getPoints();       // render as line
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