    skybox = vtkOpenGLSkybox()

    irradiance = ren.GetEnvMapIrradiance()
    irradiance.SetIrradianceStep(0.3)

    # Choose how to generate the skybox.
--
    skybox = vtkOpenGLSkybox()

    irradiance = ren.GetEnvMapIrradiance()
    irradiance.SetIrradianceStep(0.3)

    # Choose how to generate the skybox.
--
    skybox = vtkOpenGLSkybox()

    irradiance = ren.GetEnvMapIrradiance()
    irradiance.SetIrradianceStep(0.3)

    # Choose how to generate the skybox.
