Hi!

Great, this does work.
Thank you all!

Greetings
Dieter

#declare stufe_holz = texture {T_Wood10 scale 1 rotate y*20 finish {
reflection {0.0} ambient 0.5 diffuse 0.1 } };
#declare stufe_metal = texture {T_Silver_3D};
#declare stufe_metal_ab = 0.85;

#declare shm_tex_f =
function(py,pz) {
select(py-stufe_metal_ab,0,select(pz-(1-stufe_metal_ab),1,0) )
}
#declare stufe_holz_metal =
    texture {
      function {shm_tex_f(y,z) }
//      function{y}
      texture_map {
        [ 0.0 stufe_holz ]
        [ stufe_metal_ab stufe_holz ]
        [ stufe_metal_ab*1.0107 stufe_metal ]
        [ 1 stufe_metal ]
      }
    };

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