Graphics3D[{Polygon[{{0, 0, 1.4142}, {1.4142, 0, 0.}, {0., 1.4142, 0.}}], Polygon[{{0, 0, 1.4142}, {0., 1.4142, 0.}, {-1.4142, 0., 0.}}], Polygon[{{0, 0, 1.4142}, {-1.4142, 0., 0.}, {0., -1.4142, 0.}}], Polygon[{{0, 0, 1.4142}, {0., -1.4142, 0.}, {1.4142, 0, 0.}}], Polygon[{{1.4142, 0, 0.}, {0., -1.4142, 0.}, {0., 0., -1.4142}}], Polygon[{{1.4142, 0, 0.}, {0., 0., -1.4142}, {0., 1.4142, 0.}}], Polygon[{{0., 1.4142, 0.}, {0., 0., -1.4142}, {-1.4142, 0., 0.}}], Polygon[{{-1.4142, 0., 0.}, {0., 0., -1.4142}, {0., -1.4142, 0.}}]}, {Boxed -> False, DisplayFunction -> Identity}]