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<mujoco model="swimmer">
  <compiler angle="degree" coordinate="local" inertiafromgeom="true"/>
  <option collision="predefined" density="4000" integrator="RK4" timestep="0.005" viscosity="0.1"/>
  <default>
    <geom conaffinity="1" condim="1" contype="1" material="geom" rgba="0.8 0.6 .4 1"/>
    <joint armature='0.1'  />
  </default>
  <asset>
    <texture builtin="gradient" height="100" rgb1="1 1 1" rgb2="0 0 0" type="skybox" width="100"/>
    <texture builtin="flat" height="1278" mark="cross" markrgb="1 1 1" name="texgeom" random="0.01" rgb1="0.8 0.6 0.4" rgb2="0.8 0.6 0.4" type="cube" width="127"/>
    <texture builtin="checker" height="100" name="texplane" rgb1="0 0 0" rgb2="0.8 0.8 0.8" type="2d" width="100"/>
    <material name="MatPlane" reflectance="0.5" shininess="1" specular="1" texrepeat="30 30" texture="texplane"/>
    <material name="geom" texture="texgeom" texuniform="true"/>
  </asset>
  <worldbody>
    <light cutoff="100" diffuse="1 1 1" dir="-0 0 -1.3" directional="true" exponent="1" pos="0 0 1.3" specular=".1 .1 .1"/>
    <geom conaffinity="1" condim="3" material="MatPlane" name="floor" pos="0 0 -0.1" rgba="0.8 0.9 0.8 1" size="40 40 0.1" type="plane"/>
    <!--  ================= SWIMMER ================= /-->
    <body name="torso" pos="0 0 0">
      <geom density="1000" fromto="1.5 0 0 0.5 0 0" size="0.1" type="capsule"/>
      <joint axis="1 0 0" name="slider1" pos="0 0 0" type="slide"/>
      <joint axis="0 1 0" name="slider2" pos="0 0 0" type="slide"/>
      <joint axis="0 0 1" name="rot" pos="0 0 0" type="hinge"/>
      <body name="mid0" pos="0.5 0 0">
        <geom density="1000" fromto="0 0 0 -1 0 0" size="0.1" type="capsule"/>
        <joint axis="0 0 1" limited="true" name="rot0" pos="0 0 0" range="-100 100" type="hinge"/>
        {{ body }}
      </body>
    </body>
  </worldbody>
  <actuator>
{{ actuators }}
  </actuator>
</mujoco>