function output = getPointCoordinates(obj, pointsIndices)
  % the output are the three coordinates in space of the given volume indices.
  % this function is the inverse of obj.getPointIndexInVolume
  coordinatesX = obj.getPointsCoordinatesX(pointsIndices(:,1));
  coordinatesY = obj.getPointsCoordinatesY(pointsIndices(:,2));
  coordinatesZ = obj.getPointsCoordinatesZ(pointsIndices(:,3));
  output = [coordinatesX, coordinatesY, coordinatesZ];
end