var transform = new Transform();
transform.setIdentity();
transform.setOrigin(new ammo.Vector3(
  _chunks[key].width / 2.0,
  0.0,
  _chunks[key].depth / 2.0)
);

var heightDataPtr = Ammo.malloc(4 * _chunks[key].width.toInt() * _chunks[key].depth.toInt());
var terrainHeightMap =_chunks[key].getTerrainHeight();
var byteCount = 0;
for (var j = 0; j < _chunks[key].depth; j++) {
  for (var i = 0; i < _chunks[key].width; i++) {
    Ammo.heapF32[heightDataPtr + byteCount >> 2] = terrainHeightMap[j * _chunks[key].width.toInt() + i];
    // There are 4 bytes per float (height value)
    byteCount += 4;
  }
}
var terrainMeshShape = new HeightfieldTerrainShape(
  _chunks[key].width.toInt(), _chunks[key].depth.toInt(),
  heightDataPtr, 1.0,
  _chunks[key].getMinimumHeight(), _chunks[key].getMaximumHeight(),
  1, "PHY_FLOAT", false
);

var xScaling = _chunkWidth / (_chunks[key].width - 1.0); // TODO: Calculate the terrain extents
var zScaling = _chunkDepth / (_chunks[key].depth - 1.0);
terrainMeshShape.setLocalScaling(new ammo.Vector3(xScaling, 1.0, zScaling));
terrainMeshShape.setMargin(0.05);

var motionState = new DefaultMotionState(transform);
var constructionInfo = new RigidBodyConstructionInfo(0.0, motionState, terrainMeshShape, new ammo.Vector3(0.0, 0.0, 0.0));
var rigidBody = new RigidBody(constructionInfo);

_dynamicsWorld.addRigidBody(rigidBody);