def METHOD_NAME(self):
    n = self._nAtoms
    data = np.zeros(n, [('a_position', np.float32, 3),
                        ('a_color', np.float32, 3),
                        ('a_radius', np.float32)])
    data['a_position'] = self.coords
    data['a_color'] = self.atomsColours
    data['a_radius'] = self.atomsScales*self.ps
    self.program.bind(gloo.VertexBuffer(data))
    self.program['u_model'] = self.model
    self.program['u_view'] = self.view
    self.program['u_light_position'] = 0., 0., 2.
    self.program['u_light_spec_position'] = -5., 5., -5.