Compute the Delaunay tetrahedralisation for a set of points in 3d space.

Input parameters:

1. Pt → Points to tetrahedralise.
2. Qt → Minimum quality threshold for tetrahedra ranging from 0 to 1. Tetrahedra with quality below this value will be removed from the output.

Output parameters:

1. Ts → Delaunay tetrahedra meshes.
2. Ed → Delaunay edges as lines.
3. Ei → Indices of the edge ends in the input point list.
4. Vn → Indices of the neighbouring vertices for each vertex in the input point list.
5. Ti → Indices of the vertices of each tetrahedron in the input point list.
6. Tn → For each tetrahedron, the indices of the four neighbouring tetrahedra, or -1 if it is a boundary face.