Metaballs

In wikipedia’s metaball article there is a picture of two differently coloured metaballs merging together, made in Bryce. Is this possible in Blender? It seems I can either make them have different materials (if I rename them so they belong to different “families”) or make them merge, not do both at the same time.

Please could you use the support forums for support questions. Thread moved to Support / Materials and Textures

I know this is possible to be done with PovRay (An open source ray tracer). but I don’t thing it is possible directly in blender with the current exporter exporter script.