{# ---------------------------------------------------------------- #}
{# general geometry and properties#}
{# ---------------------------------------------------------------- #}
{# geometry #}
{# hull geometry #}
{%- set hull_length = 4.7 -%}
{%- set hull_max_diameter = 1.6 -%}

{# gondola geometry #}
{%- set gondola_length = 0.4 -%}
{%- set gondola_width = 0.17 -%}
{%- set gondola_height = 0.1 -%}

{# fin geometry #}
{%- set fin_root_chord = 0.465 -%}
{%- set fin_thickness = 0.01 -%}
{%- set fin_span = 0.39 -%}

{# center of volume as measured from the nose #}
{%- set hull_cov = 2.22 -%}

{# distances: prefix d_ is measured from a specific point and prefix r_ is measured from CoV #}
{# measured in body NED frame #}
{# gondola distance from nose and height #}
{%- set d_gon_x = 2 -%}
{%- set r_gon_y = 0 -%}
{%- set r_gon_z = 0.8486 -%}

{# payload distance from nose and height #}
{%- set d_pl_x = 2.4 -%}
{%- set r_pl_z = 0.784 -%}

{# thrust point distance from front of gondola and height #}
{%- set d_p_x = 0.1 -%}
{%- set r_p_z = 0.8486 -%}

{# start of fin distance from nose and distance from center of hull #}
{%- set d_fin_x_s = 3.635 -%}
{%- set r_fin_rad = 0.5634 -%}

{# actuator distances #}
{# motor distance from gondola #}
{%- set d_mot_y = 0.45 -%}
{# thruster rod radius #}
{%- set mot_rod_r = 0.01 -%}
{# thruster prop radius (13") #}
{%- set mot_prop_r = 0.1651 -%}
{# thruster prop height #}
{%- set mot_prop_h = 0.02 -%}
{# rudder prop radius (5") #}
{%- set rud_prop_r = 0.0635 -%}
{# rudder prop height #}
{%- set rud_prop_h = 0.02 -%}

{# masses #}
{# hull mass #}
{%- set hull_mass = 1.7 -%}
{# hull volume #}
{%- set hull_volume = 5.97 -%}
{# gondola mass #}
{%- set gondola_mass = 3.3 -%}
{# payload mass #}
{%- set pl_mass = 1.05 -%}
{# fin mass #}
{%- set fin_mass = 0.055 -%}

{# material properties #}
{# air density (at MSL 15 deg) #}
{%- set air_density = 1.225 -%}
{# gas density (Helium) #}
{%- set gas_density = 0.175 -%}

{# motor properties #}
{# maximum thruster rotational velocity (rad/s) #}
{%- set mot_max_vel = 1500 -%}
{# maximum thruster lift (kg) #}
{%- set mot_max_thrust_kg = 1.62 -%}
{# main thrusters time constant #}
{%- set mot_tau = 0.05 -%}
{# maximum thruster angle (rad) #}
{%- set mot_max_angle = 135 * np.pi / 180 -%}
{# maximum rudder rotational velocity (rad/s) #}
{%- set rud_max_vel = 1500 -%}
{# maximum rudder lift (kg) #}
{%- set rud_max_thrust_kg = 0.24 -%}
{# rudder motor time constant #}
{%- set rud_tau = 0.025 -%}

{# aerodynamic properties #}
{# added mass due to the hull coefficients #}
{%- set k_axial = 0.04662 -%}
{%- set k_transverse = 0.9147 -%}
{%- set k_rotation = 0.75567 -%}

{# added mass due to the fins coefficients #}
{%- set m_added_fins_k44 = 1 -%}
{%- set m_added_fins_efficiency_factor = 0.191395 -%}

{# ---------------------------------------------------------------- #}
{# positions #}
{# ---------------------------------------------------------------- #}
{# spawn height above ground #}
{%- set origin_height = 2 -%}

{# hull center of volume #}
{%- set origin_x = hull_cov - hull_length/2 -%}
{%- set origin_y = 0 -%}
{%- set origin_z = origin_height + hull_max_diameter/2 + gondola_height + 0.2 -%}

{# ---------------------------------------------------------------- #}
{# calculations #}
{# ---------------------------------------------------------------- #}
{# gas mass #}
{%- set gas_mass = gas_density*hull_volume -%}

{# total mass #}
{%- set total_mass = hull_mass + gas_mass + gondola_mass + 4*fin_mass + pl_mass -%}

{# distances (calculate from hull ellipsoid geometry) #}
{# gondola center #}
{%- set r_gon_x = hull_cov - d_gon_x -%}
{# payload center #}
{%- set r_pl_x = hull_cov - d_pl_x -%}
{# thrust center #}
{%- set r_p_x = hull_cov - (d_p_x + d_gon_x - gondola_length/2)-%}
{# fin center #}
{%- set r_fin_x = hull_cov - (d_fin_x_s + fin_root_chord/2) -%}
{%- set r_fin_center_rad = r_fin_rad + fin_span/2 -%}

{# center of gravity coordinate #}
{%- set r_g_x = (gondola_mass*r_gon_x + 4*fin_mass*r_fin_x + pl_mass*r_pl_x)/total_mass -%}
{%- set r_g_y = 0 -%}
{%- set r_g_z = (gondola_mass*r_gon_z + pl_mass*r_pl_z)/total_mass -%}

{# moment of inertia #}
{# hull #}
{%- set hull_ixx = (1/3)*hull_mass*((hull_max_diameter/2)**2 + (hull_max_diameter/2)**2) -%}
{%- set hull_iyy = (1/3)*hull_mass*((hull_max_diameter/2)**2 + (hull_length/2)**2) -%}
{%- set hull_izz = (1/3)*hull_mass*((hull_max_diameter/2)**2 + (hull_length/2)**2) -%}

{# gas #}
{%- set gas_ixx = (1/5)*gas_mass*((hull_max_diameter/2)**2 + (hull_max_diameter/2)**2) -%}
{%- set gas_iyy = (1/5)*gas_mass*((hull_max_diameter/2)**2 + (hull_length/2)**2) -%}
{%- set gas_izz = (1/5)*gas_mass*((hull_max_diameter/2)**2 + (hull_length/2)**2) -%}

{# gondola #}
{%- set gondola_ixx = (1/12)*gondola_mass*(gondola_height**2 + gondola_width**2) + gondola_mass*r_gon_x**2 -%}
{%- set gondola_iyy = (1/12)*gondola_mass*(gondola_height**2 + gondola_length**2) + gondola_mass*r_gon_y**2 -%}
{%- set gondola_izz = (1/12)*gondola_mass*(gondola_width**2 + gondola_length**2) + gondola_mass*r_gon_z**2 -%}

{# payload #}
{%- set payload_ixx = pl_mass*r_pl_x**2 -%}
{%- set payload_iyy = 0 -%}
{%- set payload_izz = pl_mass*r_pl_z**2 -%}

{# fins #}
{%- set fins_ixx = 4*((1/12)*fin_mass*(fin_span**2) + fin_mass*r_fin_x**2) -%}
{%- set fins_iyy = 2*((1/12)*fin_mass*fin_root_chord**2 + fin_mass*r_fin_center_rad**2 + (1/12)*fin_mass*(fin_root_chord**2 + fin_span**2) + fin_mass*(r_fin_center_rad**2 + 0*r_fin_x**2)) -%}
{%- set fins_izz = fins_iyy -%}

{# total mass moment of inertia #}
{%- set ixx = hull_ixx + gas_ixx + gondola_ixx + fins_ixx + payload_ixx -%}
{%- set iyy = hull_iyy + gas_iyy + gondola_iyy + fins_iyy + payload_iyy -%}
{%- set izz = hull_izz + gas_izz + gondola_izz + fins_izz + payload_izz -%}

{# actuator properties #}
{# simulation motor slowdown #}
{%- set sim_rotor_slow = 10 -%}
{# thruster motor constant #}
{%- set mot_coeff = (mot_max_thrust_kg * 9.81)/(mot_max_vel**2) -%}
{# thruster motor constant #}
{%- set rud_coeff = (rud_max_thrust_kg * 9.81)/(rud_max_vel**2) -%}

{# ---------------------------------------------------------------- #}
{# macros #}
{# ---------------------------------------------------------------- #}
{%- macro inertial(m, ixx, iyy, izz) -%}
<inertial>
  <mass>{{m}}</mass>
  <inertia>
    <ixx>{{ixx}}</ixx>
    <iyy>{{iyy}}</iyy>
    <izz>{{izz}}</izz>
  </inertia>
</inertial>
{%- endmacro -%}

{%- macro inertial_offset(m, ixx, iyy, izz, x, y, z) -%}
<inertial>
  <pose>{{ x }} {{ y }} {{ z }} 0 0 0</pose>
  <mass>{{m}}</mass>
  <inertia>
    <ixx>{{ixx}}</ixx>
    <iyy>{{iyy}}</iyy>
    <izz>{{izz}}</izz>
  </inertia>
</inertial>
{%- endmacro -%}

{%- macro cylinder(r, h) -%}
<geometry>
  <cylinder>
    <radius>{{r}}</radius>
    <length>{{h}}</length>
  </cylinder>
</geometry>
{%- endmacro -%}

{%- macro box(x, y, z) -%}
<geometry>
  <box>
    <size>{{x}} {{y}} {{z}}</size>
  </box>
</geometry>
{%- endmacro -%}

{%- macro thruster(motor_num, direction, reverse, parent, mass, dist_x, dist_y, dist_z, roll, pitch, radius, height, tau, max_vel, motor_constant, moment_constant, drag_coeff, roll_coeff) -%}
<link name="rotor_{{ motor_num }}">
  <pose>{{ origin_x + dist_x }} {{ origin_y + dist_y }} {{ origin_z + dist_z }} {{ roll }} {{ pitch }} 0</pose>
  {{ inertial(mass, mass*height**2, mass*(1/12)*((2*radius)**2 + height**2), mass*(1/12)*((2*radius)**2 + height**2))|indent(6) }}

  <gravity>false</gravity>
  <self_collide>false</self_collide>
  <velocity_decay/>

  <visual name="rotor_{{ motor_num }}_visual">
    <geometry>
      <mesh>
        <scale>{{ radius * 2 / 0.25711 }} {{ radius * 2 / 0.25711 }} {{ height / 0.00959 }}</scale>
        <uri>model://cloudship/meshes/prop_{{ direction }}.dae</uri>
      </mesh>
    </geometry>
  </visual>

  <collision name="rotor_{{ motor_num }}_collision">
    <geometry>
      <cylinder>
        <length>{{ mot_prop_h }}</length>
        <radius>{{ radius }}</radius>
      </cylinder>
    </geometry>
  </collision>
</link>

<joint name='rotor_{{ motor_num }}_joint' type='revolute'>
  <child>rotor_{{ motor_num }}</child>
  <parent>{{ parent }}</parent>
  <axis>
    <xyz>0 0 1</xyz>
    <limit>
      <lower>-1e+16</lower>
      <upper>1e+16</upper>
    </limit>
    <dynamics>
      <spring_reference>0</spring_reference>
      <spring_stiffness>0</spring_stiffness>
    </dynamics>
  </axis>
</joint>

{# Only to visualize motor spin #}
<plugin name='rotor_{{ motor_num }}_model' filename='libgazebo_motor_model.so'>
  <robotNamespace/>
  <jointName>rotor_{{ motor_num }}_joint</jointName>
  <linkName>rotor_{{ motor_num }}</linkName>
  <turningDirection>{{ direction }}</turningDirection>
  <reversible>{{ reverse }}</reversible>
  <timeConstantUp>{{ tau }}</timeConstantUp>
  <timeConstantDown>{{ tau }}</timeConstantDown>
  <maxRotVelocity>{{ max_vel }}</maxRotVelocity>
  <motorConstant>{{ motor_constant }}</motorConstant>
  <momentConstant>{{ moment_constant }}</momentConstant>
  <rotorDragCoefficient>{{ drag_coeff }}</rotorDragCoefficient>
  <rollingMomentCoefficient>{{ roll_coeff }}</rollingMomentCoefficient>
  <commandSubTopic>/gazebo/command/motor_speed</commandSubTopic>
  <motorNumber>{{ motor_num }}</motorNumber>
  <motorSpeedPubTopic>/motor_speed/{{ motor_num }}</motorSpeedPubTopic>
  <rotorVelocitySlowdownSim>{{sim_rotor_slow}}</rotorVelocitySlowdownSim>
</plugin>
{%- endmacro -%}

{%- macro fin(name, roll, y, z) -%}
<visual name="{{ name }}_visual">
  <pose>{{ r_fin_x - fin_root_chord/2 }} {{ y }} {{ z }} {{ roll }} 0 0</pose>
  {{ box(fin_root_chord, fin_thickness, fin_span * 2) | indent(8) }}
</visual>

<collision name="{{ name }}_collision">
  <pose>{{ r_fin_x - fin_root_chord/2 }} {{ y }} {{ z }} {{ roll }} 0 0</pose>
  {{ box(fin_root_chord, fin_thickness, fin_span * 2) | indent(8) }}
</collision>
{%- endmacro -%}

{# ---------------------------------------------------------------- #}
{# SDF description #}
{# ---------------------------------------------------------------- #}
<?xml version="1.0" ?>
<!-- DO NOT EDIT: Generated from cloudship.sdf.jinja -->
<sdf version="1.5">

  <model name="cloudship">

    <self_collide>false</self_collide>
    <static>false</static>

    {# Airship #}
    <link name="hull">
      <pose>{{ origin_x }} {{ origin_y }} {{ origin_z }} 0 0 0</pose>
      {{ inertial_offset(total_mass, ixx, iyy, izz, r_g_x, r_g_y, -r_g_z)|indent(6) }}

      <gravity>true</gravity>
      <self_collide>false</self_collide>
      <velocity_decay/>

      {# Hull #}
      <visual name="hull_visual">
        <geometry>
          <mesh>
            <scale>{{ hull_length / 2 }} {{ hull_max_diameter / 2 }} {{ hull_max_diameter / 2 }}</scale>
            <uri>model://cloudship/meshes/ellipsoid.stl</uri>
          </mesh>
        </geometry>
      </visual>

      <collision name="hull_collision">
        <pose>0 0 0 0 0 0</pose>
        <geometry>
          <mesh>
            <scale>{{ hull_length / 2 }} {{ hull_max_diameter / 2 }} {{ hull_max_diameter / 2 }}</scale>
            <uri>model://cloudship/meshes/ellipsoid.stl</uri>
          </mesh>
        </geometry>
      </collision>

      {# Gondola #}
      <visual name="gondola_visual">
        <pose>{{ r_gon_x }} {{ r_gon_y }} {{ -r_gon_z + gondola_height / 2 }} 0 0 0</pose>
        {{ box(gondola_length, gondola_width, gondola_height * 2) | indent(8) }}
      </visual>

      <collision name="gondola_collision">
        <pose>{{ r_gon_x }} {{ r_gon_y }} {{ -r_gon_z }} 0 0 0</pose>
        {{ box(gondola_length, gondola_width, gondola_height) | indent(8) }}
      </collision>

      {# Payload #}
      <visual name="payload_visual">
      <pose>{{ r_pl_x }} {{ 0 }} {{ -r_pl_z }} {{ np.pi / 2 }} 0 0</pose>
        {{ cylinder(0.05, 0.1) | indent(8) }}
      </visual>

      <collision name="payload_collision">
      <pose>{{ r_pl_x }} {{ 0 }} {{ -r_pl_z }} {{ np.pi / 2 }} 0 0</pose>
        {{ cylinder(0.05, 0.1) | indent(8) }}
      </collision>

      {# Fins #}
      {{ fin("fin_top", 0, 0, r_fin_rad - fin_span/2) }}
      {{ fin("fin_port", -np.pi / 2, r_fin_rad - fin_span/2, 0) }}
      {{ fin("fin_sb", np.pi / 2, -r_fin_rad + fin_span/2, 0) }}

      <visual name="fin_bottom_rotor_visual">
        <pose>{{ r_fin_x - fin_root_chord/2 }} {{ 0 }} {{ -r_fin_rad - fin_span/2 }} 0 0 0</pose>
        <geometry>
          <mesh>
            <scale>{{ fin_root_chord }} {{ fin_thickness }} {{ fin_span }}</scale>
            <uri>model://cloudship/meshes/fin_prop.stl</uri>
          </mesh>
        </geometry>
      </visual>
      <visual name="fin_bottom_plate_visual">
        <pose>{{ r_fin_x - fin_root_chord/2 }} {{ 0 }} {{ -r_fin_rad + fin_span }} 0 0 0</pose>
        {{ box(fin_root_chord, fin_thickness, fin_span) | indent(8) }}
      </visual>

      <collision name="fin_bottom_collision">
        <pose>{{ r_fin_x - fin_root_chord/2 }} {{ 0 }} {{ -r_fin_rad - fin_span/2 }} 0 0 0</pose>
        <geometry>
          <mesh>
            <scale>{{ fin_root_chord }} {{ fin_thickness }} {{ fin_span }}</scale>
            <uri>model://cloudship/meshes/fin_prop.stl</uri>
          </mesh>
        </geometry>
      </collision>
    </link>
    
    {# GPS joint which includes GPS plugin #}
    <include>
      <uri>model://gps</uri>
      <pose>0 0 0 0 0 0</pose>
      <name>gps</name>
    </include>
    <joint name='gps_joint' type='fixed'>
      <child>gps::link</child>
      <parent>hull</parent>
    </joint>

    {# Thrusters Rod #}
    <link name="thrusters_rod">
      <pose>{{ origin_x + r_p_x }} {{ origin_y }} {{ origin_z - r_p_z }} 0 0 0</pose>
      {%- set thrusters_rod_mass = 0.5 -%}
      {{ inertial(thrusters_rod_mass, thrusters_rod_mass * (1/12)*(3*mot_rod_r**2 + (2*d_mot_y)**2), thrusters_rod_mass * 0.5*mot_rod_r**2, thrusters_rod_mass * (1/12)*(3*mot_rod_r**2 + (2*d_mot_y)**2))|indent(6) }}

      <gravity>false</gravity>
      <self_collide>false</self_collide>
      <velocity_decay/>

      <visual name="thrusters_rod_visual">
        <pose>0 0 0 {{ np.pi / 2 }} 0 0</pose>
        {{ cylinder(mot_rod_r, 2*d_mot_y) | indent(8) }}
      </visual>
      <visual name="port_prop_gaurd_visual">
        <pose>{{ mot_prop_h }} {{ d_mot_y }} 0 0 {{ np.pi / 2 }} 0</pose>
        <geometry>
          <mesh>
            <scale>{{ 1.1 * mot_prop_r }} {{ 1.1 * mot_prop_r }} {{ mot_prop_h }}</scale>
            <uri>model://cloudship/meshes/prop_gaurd.stl</uri>
          </mesh>
        </geometry>
      </visual>
      <visual name="sb_prop_gaurd_visual">
        <pose>{{ mot_prop_h }} {{ -d_mot_y }} 0 0 {{ np.pi / 2 }} 0</pose>
        <geometry>
          <mesh>
            <scale>{{ 1.1 * mot_prop_r }} {{ 1.1 * mot_prop_r }} {{ mot_prop_h }}</scale>
            <uri>model://cloudship/meshes/prop_gaurd.stl</uri>
          </mesh>
        </geometry>
      </visual>

      <collision name="thrusters_rod_port_collision">
        <pose>0 {{ (d_mot_y - gondola_width/2)/2 + gondola_width/2 }} 0 {{np.pi / 2}} 0 0</pose>
        {{ cylinder(mot_rod_r, d_mot_y - gondola_width/2) | indent(8) }}
      </collision>
      <collision name="thrusters_rod_sb_collision">
        <pose>0 {{ -((d_mot_y - gondola_width/2)/2 + gondola_width/2) }} 0 {{np.pi / 2}} 0 0</pose>
        {{ cylinder(mot_rod_r, d_mot_y - gondola_width/2) | indent(8) }}
      </collision>
    </link>

    <joint name='thrusters_rod_joint' type='revolute'>
      <parent>hull</parent>
      <child>thrusters_rod</child>
      <axis>
        <xyz>0 1 0</xyz>
        <limit>
          <lower>-{{ np.pi }}</lower>
          <upper>{{ np.pi }}</upper>
        </limit>
        <dynamics>
          <damping>0.1</damping>
        </dynamics>
      </axis>
      <physics>
        <ode>
          <implicit_spring_damper>1</implicit_spring_damper>
        </ode>
      </physics>
    </joint>

    {# Thrusters #}
    {{ thruster(0, "ccw", false, "thrusters_rod", 0.0025, r_p_x + mot_prop_h / 2 + mot_rod_r, d_mot_y, - r_p_z - mot_rod_r / 2, 0, np.pi / 2, mot_prop_r, mot_prop_h, mot_tau, mot_max_vel, mot_coeff, 0, 0.000806428, 0.000001) }}
    {{ thruster(1, "cw", false, "thrusters_rod", 0.0025, r_p_x + mot_prop_h / 2 + mot_rod_r, -d_mot_y, - r_p_z, 0, np.pi / 2, mot_prop_r, mot_prop_h, mot_tau, mot_max_vel, mot_coeff, 0, 0.000806428, 0.000001) }}
    {{ thruster(3, "cw", true, "hull", 0.0015, r_fin_x - fin_root_chord/2, 0, -r_fin_rad, np.pi / 2, 0, rud_prop_r, rud_prop_h, rud_tau, rud_max_vel, rud_coeff, 0, 0.000806428, 0.000001) }}

    {# Plugins #}
    {# Airship Dynamics #}
    <plugin name='gazebo_airship_dynamics_plugin' filename='libgazebo_airship_dynamics_plugin.so'>
      <robotNamespace/>
      <linkName>hull</linkName>
      <hullVolume>{{ hull_volume }}</hullVolume>
      <airDensity>{{ air_density }}</airDensity>
      <m11>0.34094584</m11>
      <m22>6.89645916</m22>
      <m26>0.8003539</m26>
      <m33>6.89645916</m33>
      <m35>-0.8003539</m35>
      <m44>0.03909877</m44>
      <m53>-0.8003539</m53>
      <m55>4.51385307</m55>
      <m62>0.8003539</m62>
      <m66>4.51385307</m66>
      <distCOV>{{ hull_cov }}</distCOV>
      <distPotentialFlow>3.758</distPotentialFlow>
      <distFinCenter>3.884</distFinCenter>
      <distQuarterChord>0.7454</distQuarterChord>
      <forceHullInviscidFlowCoeff>-0.9576310423950283</forceHullInviscidFlowCoeff>
      <forceHullViscousFlowCoeff>0.5829522229750153</forceHullViscousFlowCoeff>
      <momentHullInviscidFlowCoeff>1.9534480725890846</momentHullInviscidFlowCoeff>
      <momentHullViscousFlowCoeff>-1.1196943420983705</momentHullViscousFlowCoeff>
      <finNormalForceCoeff>0.552208563394833</finNormalForceCoeff>
      <finStallAngle>19.098</finStallAngle>
      <axialDragCoeff>0.35</axialDragCoeff>
      <windSubTopic>/wind_vel</windSubTopic>
    </plugin>

    {# IMU #}
    <plugin name='gazebo_imu_plugin' filename='libgazebo_imu_plugin.so'>
      <robotNamespace/>
      <linkName>hull</linkName>
      <imuTopic>/imu</imuTopic>
    </plugin>

    {# Magnetometer #}
    <plugin name='magnetometer_plugin' filename='libgazebo_magnetometer_plugin.so'>
      <robotNamespace/>
      <pubRate>20</pubRate>
      <noiseDensity>0.0004</noiseDensity>
      <randomWalk>6.4e-06</randomWalk>
      <biasCorrelationTime>600</biasCorrelationTime>
      <magTopic>/mag</magTopic>
    </plugin>

    {# Barometer #}
    <plugin name='barometer_plugin' filename='libgazebo_barometer_plugin.so'>
      <robotNamespace/>
      <pubRate>10</pubRate>
      <baroTopic>/baro</baroTopic>
    </plugin>

    {# MAVLink #}
    <plugin name='mavlink_interface' filename='libgazebo_mavlink_interface.so'>
      <robotNamespace/>
      <imuSubTopic>/imu</imuSubTopic>
      <gpsSubTopic>/gps</gpsSubTopic>
      <magSubTopic>/mag</magSubTopic>
      <baroSubTopic>/baro</baroSubTopic>

      <mavlink_addr>INADDR_ANY</mavlink_addr>
      <mavlink_udp_port>14560</mavlink_udp_port>
      <mavlink_tcp_port>4560</mavlink_tcp_port>
      <serialEnabled>false</serialEnabled>
      <serialDevice>/dev/ttyACM0</serialDevice>
      <baudRate>921600</baudRate>
      <qgc_addr>INADDR_ANY</qgc_addr>
      <qgc_udp_port>14550</qgc_udp_port>

      <hil_mode>false</hil_mode>
      <hil_state_level>false</hil_state_level>
      <enable_lockstep>true</enable_lockstep>
      <use_tcp>true</use_tcp>

      <send_vision_estimation>true</send_vision_estimation>
      <send_odometry>false</send_odometry>

      <control_channels>
        <channel name='rotor_1'>
          <input_index>0</input_index>
          <input_offset>0</input_offset>
          <input_scaling>{{ mot_max_vel }}</input_scaling>
          <zero_position_disarmed>0</zero_position_disarmed>
          <zero_position_armed>0</zero_position_armed>
          <joint_control_type>velocity</joint_control_type>
          <joint_name>rotor_1_joint</joint_name>
        </channel>
        <channel name='rotor_2'>
          <input_index>1</input_index>
          <input_offset>0</input_offset>
          <input_scaling>{{ mot_max_vel }}</input_scaling>
          <zero_position_disarmed>0</zero_position_disarmed>
          <zero_position_armed>0</zero_position_armed>
          <joint_control_type>velocity</joint_control_type>
          <joint_name>rotor_2_joint</joint_name>
        </channel>
        <channel name="thrusters_rod">
          <input_index>2</input_index>
          <input_offset>0</input_offset>
          <input_scaling>-{{ mot_max_angle }}</input_scaling>
          <zero_position_disarmed>0</zero_position_disarmed>
          <zero_position_armed>0</zero_position_armed>
          <joint_control_type>position</joint_control_type>
          <joint_control_pid>
            <p>80</p>
            <i>0</i>
            <d>0</d>
            <iMax>0.0</iMax>
            <iMin>0.0</iMin>
            <cmdMax>{{ mot_max_angle/2 }}</cmdMax>
            <cmdMin>-{{ mot_max_angle/2 }}</cmdMin>
          </joint_control_pid>
          <joint_name>thrusters_rod_joint</joint_name>
        </channel>
        <channel name='rotor_3'>
          <input_index>3</input_index>
          <input_offset>0</input_offset>
          <input_scaling>{{ rud_max_vel }}</input_scaling>
          <zero_position_disarmed>0</zero_position_disarmed>
          <zero_position_armed>0</zero_position_armed>
          <joint_control_type>velocity</joint_control_type>
          <joint_name>rotor_3_joint</joint_name>
        </channel>
      </control_channels>
    </plugin>

  </model>

</sdf>

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