bar3 width depend on zdata?

Ok, so I know how to make the colours on my bar graph depend on zdata ..

h = bar3(data);
for ii = 1:length(h)
  zdata = get(h(ii), 'Zdata');
  set(h(ii), 'Cdata', -zdata)
end
colormap gray

But, I think it would look much better if I could also make the width of the bars depend on my zdata too. I've seen this done in papers, just got no idea how to do it. There is a width option for bar3 graphs, however, it appears to be a scalar value only.

Any help would be appreciated.

[Craig Cowled]

According to Matlab Support, this can't be done!!

I'm not going to give up on this, I'm pretty sure it can be done using patch. Will post a solution if I get one, but still keen to hear any other ideas.