griddedInterpolant 3D from two 2D grid and one 1D grid?

Hi,

I'ts early sunday morning and I just can't seem to get my head around this...

I've got 2 2D grids:

size(a)=(GC,GA) size(b)=(GC,GA)

and one 1D grid: size(c)=GC

where GX is the number of gridpoints of grid X. Now, I want to set up a griddedInterpolant object using all three of grids but I just cant figure out how to do it? I previously had a loop over GC where I set up and evaluated the interpolant in GC point, but it turnes out its very expensive to set up the griddedInterpolant repeatedly so I'm looking for a more efficient way. I've been playing around with NDGRID but can't seem to get it working... In the end I will be using (X+1)D intepolation from X 2D grids and one 1D grid so a semi-general solution would be preferred :)

Any help would be greatly appreciated!

Kindly, Anders