QTF: Quasi-triangulation file format

► Quasi-triangulation is very useful for solving proximity problems among spherical balls. ► Loading a neutral file of the quasi-triangulation is more competitive than computing on the fly. ► A quasi-triangulation file format, called the QTF, is proposed. ► A thorough validation of the proposal is presented. ► The proposal separates the computation of the Voronoi diagram from its applications.