TH3F "4D" histogram

Greetings to all,
I’m new in this forum, although not a total newbie in the ROOT environment. Still, I can’t find in the DOCs (or in a previous topic in this forum) the ‘right’ way to show a 4D histogram (i.e., a TH3F filled with weigths, Fill(x,y,z,w) ).
My intent is to show the “weight” as a color (since there is surely only one entry per bin), with some kind of transparency so that the “inner” points can be seen through the “outer” points…do you think that is possible?


See TH3F "4D" histogram