roboschool/mujoco_assets/inverted_pendulum.xml (25 lines of code) (raw):
<mujoco model="inverted pendulum">
<compiler inertiafromgeom="true"/>
<default>
<joint armature="0" damping="1" limited="true"/>
<geom contype="0" friction="1 0.1 0.1" rgba="0.7 0.7 0 1"/>
<tendon/>
<motor ctrlrange="-3 3"/>
</default>
<option gravity="0 0 -9.81" integrator="RK4" timestep="0.02"/>
<size nstack="3000"/>
<worldbody>
<!--geom name="ground" type="plane" pos="0 0 0" /-->
<geom name="rail" pos="0 0 0" quat="0.707 0 0.707 0" rgba="0.3 0.3 0.7 1" size="0.02 1" type="capsule"/>
<body name="cart" pos="0 0 0">
<joint axis="1 0 0" limited="true" name="slider" pos="0 0 0" range="-1 1" type="slide"/>
<geom name="cart" pos="0 0 0" quat="0.707 0 0.707 0" size="0.1 0.1" type="capsule"/>
<body name="pole" pos="0 0 0">
<joint axis="0 1 0" name="hinge" pos="0 0 0" limited="false" range="-90 90" type="hinge"/>
<geom fromto="0 0 0 0.001 0 0.6" name="cpole" rgba="0 0.7 0.7 1" size="0.049 0.3" type="capsule"/>
<!-- <body name="pole2" pos="0.001 0 0.6"><joint name="hinge2" type="hinge" pos="0 0 0" axis="0 1 0"/><geom name="cpole2" type="capsule" fromto="0 0 0 0 0 0.6" size="0.05 0.3" rgba="0.7 0 0.7 1"/><site name="tip2" pos="0 0 .6"/></body>-->
</body>
</body>
</worldbody>
<actuator>
<motor gear="100" joint="slider" name="slide"/>
</actuator>
</mujoco>