function packBuffer(points, ellipsoid) {
  const rectangle = points._rectangle;
  const minimumHeight = points._minHeight;
  const maximumHeight = points._maxHeight;

  const packedLength = 2 + Rectangle.packedLength + Ellipsoid.packedLength;
  const packedBuffer = new Float64Array(packedLength);

  let offset = 0;
  packedBuffer[offset++] = minimumHeight;
  packedBuffer[offset++] = maximumHeight;

  Rectangle.pack(rectangle, packedBuffer, offset);
  offset += Rectangle.packedLength;

  Ellipsoid.pack(ellipsoid, packedBuffer, offset);

  return packedBuffer;
}
Gets the texture atlas memory in bytes.

@memberof Vector3DTilePoints.prototype

@type {number}
@readonly
@private