<?xml version="1.0" ?>
<sdf version="1.5">

  <!--
    This is the underwater.world file which starts the Gazebo simulation based on the autonomous underwater vehicle
    Hippocampus from the Technical University Hamburg-Harburg (TUHH).
    https://www.tuhh.de/mum/forschung/forschungsgebiete-und-projekte/flow-field-estimation-with-a-swarm-of-auvs.html
  -->

  <world name="default">
    <!-- A global light source -->
    <!--include>
      <uri>model://sun</uri>
    </include-->

    <!-- Add physics -->
    <physics name='default_physics' default='0' type='ode'>
      <gravity>0 0 -9.8066</gravity>
      <ode>
        <solver>
          <type>quick</type>
          <iters>10</iters>
          <sor>1.3</sor>
          <use_dynamic_moi_rescaling>0</use_dynamic_moi_rescaling>
        </solver>
        <constraints>
          <cfm>0</cfm>
          <erp>0.2</erp>
          <contact_max_correcting_vel>100</contact_max_correcting_vel>
          <contact_surface_layer>0.001</contact_surface_layer>
        </constraints>
      </ode>
      <max_step_size>0.004</max_step_size>
      <real_time_factor>1</real_time_factor>
      <real_time_update_rate>250</real_time_update_rate>
      <magnetic_field>6.0e-6 2.3e-5 -4.2e-5</magnetic_field>
    </physics>
  </world>
</sdf>