from the read me.
dg_voroPy.py goes in your maya python path, this can be set with maya.env check maya docs to see how.
dg_voro_py_UI.mel goes in your Maya script directory.
type dg_voro_py_UI(); in the script editor, or make a shelf button.
Voronoi shatter requires a closed 3d poly mesh object and a group of locators to define the cell centres. Select the object first then the locator group and click the button.
two locator conversion utilities are provided:
particles to locators... select particles, click the button.
constrained particles to locators... select a poly mesh, then particles. The resulting locators are constrained within the bounds of the selected mesh.
NB. for best results, make sure your poly mesh is error free, and without construction history. The script will work on a mesh with construction history, but will populate your scene with lots of empty transforms.