Convert isosurface output to meshgrid-like data

Is there a function to convert isosurface output to meshgrid-like data ? I came up with straighforward code which works very slow.

function [ zn ] = iso2mesh(pv,X2,Y2  )
pa=patch(pv);
xi=pv.vertices(:,1);
yi=pv.vertices(:,2);
zi=pv.vertices(:,3);

[zn]=griddata(xi,yi,zi,X2,Y2);

end

Answer 1

[Walter Roberson]

TriScatteredInterp might be faster.

[shir]

i' ve tried it, same speed.