How to show the 3d volume transparently ?

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Hello all, I want to ask that how the all volume can be made translucent so that I can see inner part of that ? (Is 'FaceAlpha' worth useful here ??)

the code is -

 load mri.mat;                   
 K = squeeze(D);
 K1 = padarray(K,[10 10 10],'both');
 Ds = smooth3(K1);
 i_surface = isosurface(Ds,15);
 AxesH = axes('ButtonDownFcn', 'disp(2*3)');
  hold all
 hiso = patch('Vertices', i_surface.vertices,...
             'Faces', i_surface.faces,...
             'FaceColor', [.2,.8,.9],...
             'EdgeColor', 'none');
 view(0,50);
 xlabel('X -->'); ylabel('Y -->'); zlabel('Z -->');
 axis tight 
 axis equal
 daspect([1,1,0.4])
 lightangle(-40,30); lightangle(90,0); lightangle(-180,0);
 set(gcf,'Renderer','zbuffer'); lighting phong;
 set(hiso, 'SpecularColorReflectance', 0, 'SpecularExponent', 50,'FaceAlpha',0.1);