@Override
            public void visit(Spatial spatial) {
                if (spatial instanceof Geometry) {
                    Geometry geom = (Geometry) spatial;
                    Mesh mesh = geom.getMesh();

                    // Check to ensure mesh has texcoords and normals before generating
                    if (mesh.getBuffer(Type.TexCoord) != null
                            && mesh.getBuffer(Type.Normal) != null) {
                        meshes.add(mesh);
                    }
                }
            }
A private constructor to inhibit instantiation of this class.
jme3-core/src/main/java/com/jme3/util/TangentBinormalGenerator.java