  In this paper four fundamental methods for an iso-surface extraction are
compared, based on cell decomposition to tetrahedra. The methods are compared
both on mathematically generated data sets as well as on real data sets. The
comparison using mathematical data is made from different points of view such
as area approximation, volume approximation. On the other hand, the Hausdorff
distance and root mean square are used to compare methods on real data sets.
The presented comparison can be helpful when deciding among tested methods
which one to choose, as well as when we need to compare a newly developed
method with other existing approaches.
