Moving platform

A kinematic platform slides back and forth. The character just stands on it — no walk input — and is carried along by followPlatform, matching the surface velocity so it never slides off. A loose box rides too.

Drag to orbit

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How it works

The platform is driven with moveKinematic before the world steps; the controller then steps and inherits the platform’s velocity automatically.

const platform = world.createBody({
  type: "kinematic",
  shape: Shape.box({ halfExtents: [2, 0.15, 2] }),
  position: [-4, 0.5, 0],
  layer: "moving",
});

let time = 0;
function fixedStep(dt) {
  time += dt;
  const x = Math.sin(time * 0.6) * 4;
  platform.moveKinematic([x, 0.5, 0], [0, 0, 0, 1], dt); // Jolt derives the velocity

  controller.setMovement({});  // just ride — no walk input
  controller.step(dt);         // followPlatform carries the character
  world.step(dt);
}

See also

• Moving Platforms — followPlatform, platformGripFactor, and dynamic-ground counter-impulses.