code: public static void indexToPointIndex( List<Point2D_I32> sequence , GrowQueue_I32 indexes ,
  										  FastQueue<PointIndex_I32> output ) {
  		output.reset();
  
  		for( int i = 0; i < indexes.size; i++ ) {
  			int index = indexes.data[i];
  			Point2D_I32 p = sequence.get(index);
  
  			PointIndex_I32 o = output.grow();
  			o.x = p.x;
  			o.y = p.y;
  			o.index = index;
  		}
  	}
docs: Converts the list of indexes in a sequence into a list of {@link PointIndex_I32}.
  @param sequence Sequence of points.
  @param indexes List of indexes in the sequence.
  @param output Output list of {@link PointIndex_I32}.