Relevant search results and further reading:
Stephane Laurent (stla)
https://github.com/stla/Apollonius
Inigo Quilez
https://www.shadertoy.com/view/4sd3D7
Voronoi Diagram Research Center
http://voronoi.hanyang.ac.kr/c3_voronoiDiagrams.htm
Need to further look into:
Johnson-Mehl tessellation