<mujoco model="swimmer">
  <compiler angle="degree" coordinate="local" inertiafromgeom="true" />
  <option collision="predefined" density="4000" integrator="RK4" timestep="0.01" 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 type="skybox" builtin="gradient" width="100" height="100" rgb1="1 1 1" rgb2="0 0 0" />
    <texture name="texgeom" type="cube" builtin="flat" mark="cross" width="127" height="1278" rgb1="0.8 0.6 0.4" rgb2="0.8 0.6 0.4" markrgb="1 1 1" random="0.01" />
    <texture name="texplane" type="2d" builtin="checker" rgb1="0.2 0.3 0.4" rgb2="0.1 0.2 0.3" width="100" height="100" />
    <material name='MatPlane' texture="texplane" shininess="1" texrepeat="60 60" specular="1"  reflectance="0.5" />
    <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 0s 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">
      <camera name="track" mode="trackcom" pos="0 -3 3" xyaxes="1 0 0 0 1 1" />
      <geom name="frontbody" 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="mid" pos="0.5 0 0">
        <geom name="midbody" density="1000" fromto="0 0 0 -1 0 0" size="0.1" type="capsule" />
        <joint axis="0 0 1" limited="true" name="rot2" pos="0 0 0" range="-100 100" type="hinge" />
        <body name="back" pos="-1 0 0">
          <geom name="backbody" density="1000" fromto="0 0 0 -1 0 0" size="0.1" type="capsule" />
          <joint axis="0 0 1" limited="true" name="rot3" pos="0 0 0" range="-100 100" type="hinge" />
        </body>
      </body>
    </body>
  </worldbody>
  <actuator>
    <motor ctrllimited="true" ctrlrange="-1 1" gear="150.0" joint="rot2" />
    <motor ctrllimited="true" ctrlrange="-1 1" gear="150.0" joint="rot3" />
  </actuator>
</mujoco>
