Thanks, but I need to know the index of the selected vertex of the lattice (blender 2.5) in Python, because to every vertex I must assign 3 value, then with a slider the script multiply the coordinates of every vertex with these values.
In the video there appears to be deformation attached to a slider. If you wish to replicate this in blender, you can use a mesh deform instead of a lattice, and create shape keys for the mesh deform control object. You can also use the deformed mesh to rvk script to aid in exporting.