50-using…

mesh.geo
View Options

			L = 1;
			s = 0.4;

			Point(1) = {-L/2., -L/2., 0, s};

			line[] = Extrude{L,0,0}{ Point{1}; };
			surface[] = Extrude{0,L,0}{ Line{line[1]}; };
			volume[] = Extrude{0,0,L}{ Surface{surface[1]}; };

			Physical Volume(1) = {volume[1]};

			Transfinite Surface "*";
			Recombine Surface "*";
			Transfinite Volume "*";