[Gmsh] Cutting plots of iso surfaces

[Daryl Van Vorst]

Hi,

First, I should start off with (as so many have before): Wow! Great work
guys!

Not sure if this is really a gmsh or getdp question. Apologies if it's
in the wrong list.

I get a nice iso surface plot from a getdp PostOperation like this:

PostOperation Map_phi UsingPost MagSta_phi_res {
  Print[ phi, OnElementsOf Domain, File "pm_phi.pos" ];
}

But some of the surfaces are closed and so you can't see what's under
them. Is there a way to saw off (for lack of a better term) parts of the
plot like you might saw an engine in half to show it's inner workings?

I'm hoping for something short of breaking up objects in the .geo file.
(Unless that's easier than I think it is... ) :)

Thanks,

-Daryl.