TH3::Draw() option "glcol" & "same"


I’m trying to draw two (or more) TH3 histograms in one histogram with “glcol” option.
I tried “same” option, but it was not I want.
(can control only latest histogram and it has gray back plane.)

How can I draw histograms like “box same” option?
If it is impossible, Is there any way to make back plane transparent?

Plot3D.C (1.06 KB)

Have a look at tutorials/gl/glh3c.C. Other than that - “same” + “some gl option” is not supposed to work.

Thank you for reply.
Unfortunately, I’m using different binning for each histogram.
So, my last hope is transparent back plane…