from direct.showbase.ShowBase import ShowBase
from panda3d.core import AmbientLight

class MyApp(ShowBase):

    def __init__(self):
        ShowBase.__init__(self)

        model = loader.loadModel('1313.obj')
        model.reparentTo(render)

        alight = AmbientLight('alight')
        alight.setColor((0.2, 0.2, 0.2, 1))
        alnp = render.attachNewNode(alight)
        render.setLight(alnp)

app = MyApp()
app.run()