bool cameraContainsLayerIndex( int layerIndex, uint _CAMERA_VISIBLE_LAYERS )
{
  uint layer = uint( 1 << ( layerIndex - 1 ) );
  return ( _CAMERA_VISIBLE_LAYERS & layer ) == layer;
}

bool cameraHasOnlyLayerIndex( int layerIndex, uint _CAMERA_VISIBLE_LAYERS )
{
  uint layer = uint( 1 << ( layerIndex - 1 ) );
  return _CAMERA_VISIBLE_LAYERS == layer;
}