How can I create a voronoi diagram bounded by an ellipsoid?

Hi everyone.

I am trying to create a voronoi diagram bouded by an ellipsoid which has dimension a=b=1.2 micrometer, and c=2 micrometer. As I know I can use delaunayTriangulation or voronoi to create voronoi. I also refer some available codes from Mathworks. However, I am just a beginer, honestly, I do not understand what they say. And their work is creating voronoi for arbitrary shape object which is different from mine object.

I attach to this post figure of the ellipsoid which has voronoi. (please skip the collor)