Shape3D tetrahedron = new Shape3D(te,yellowApp);
//The transformation group of the tetrahedron.
//The tetrahedron will be rotated a little bit.
Transform3D tfTetrahedron = new Transform3D();
tfTetrahedron.rotX(0.4*Math.PI);
TransformGroup tgTetrahedron = new TransformGroup(tfTetrahedron);
tgTetrahedron.addChild(tetrahedron);
//*** The root of the scenegraph. ***