public static Mesh genTbnLines(Mesh mesh, float scale) {
        if (mesh.getBuffer(Type.Tangent) == null) {
            return genNormalLines(mesh, scale);
        } else {
            return genTangentLines(mesh, scale);
        }
    }
A private constructor to inhibit instantiation of this class.
jme3-core/src/main/java/com/jme3/util/TangentUtils.java