alMatrix.makeScale(1, y, 1)
      )
      .applyMatrix(
        localMatrix.makeTranslation(-size/2, 0, -size/2)
      )
      .attributes.position.array,
    lineGeometry.attributes.position.array.length * 0
  );
  positions.set(
    lineGeometry.clone()
      .applyMatrix(
        localMatrix.makeScale(1, y, 1)
      )
      .applyMatrix(
        localMatrix.makeTranslation(size/2, 0, -size/2)
      )
      .attributes.position.array,
    lineGeometry.attributes.position.array.length * 1
  );
  positions.