How to get xyz coordinates from 3d surface?

hello every one i'm working now in texture mapping so i want to get x,y,z coordinates of a 3d object of all faces of this object but i just now to get this coordinates just for one face how i can get all coordinate of all faces this is my code

nx = 120;  % the size of the grid
  ny = 120;  % the size of the grid
 x = linspace(min(v(:,1)),max(v(:,1)),nx);
 y = linspace(min(v(:,2)),max(v(:,2)),ny);
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  % Number of x values in uniform grid
[X, Y] = meshgrid(x, y);            % Create meshes for xu and yu

 Z = gridtrimesh(f,v,X,Y);

where V and f are the faces and vertex

how i can get all coordinate of all faces this is my code my 3d object have 5 faces ?