even when someone explains it to you you would need the shader knowledge to implement it or the money to pay one who is able to do that for you.... graphics are the second thing you have to think about -develop a playable game first
well he didnt say whether he's making a gameplay or just a scene, i remember two of them, one is from shadeC by BoH_Havoc, should be quite easy to find with a search, the other am not so sure where its from but searching and you may find it
Maybe using volume shadow used in stencil shadow, but change it to white instead of black. Dunno if this applicable since shadow volume was handled inside the engine or has anyone tried that?