3D Voronoi Split

Hi all,

Beginner here so excuse my simpleness...

Im creating a 3D voronoi from a series of points within a BREP (originally a mesh transferred to NURBS).

Im wanting the surface to split the voronoi geometry so it only exits within the volume, segmenting the interior space, without having to split and delete the exterior voronoi manually in rhino.

Whats the most appropriate way of producing this outcome? any advice would be greatly appreciated. Suggestions or examples would be wicked!

Thanks very much.