import pybullet as p
import time
p.connect(p.GRAPHICS_SERVER_TCP)
import pybullet_data as pd
p.setAdditionalSearchPath(pd.getDataPath())
p.loadURDF("plane.urdf")
p.loadURDF("r2d2.urdf", [0,0,3])
p.setGravity(0,0,-10)
gravId = p.addUserDebugParameter("gravity",0,10,0)
while p.isConnected():
p.stepSimulation()