models/chair/chair_scaled_0.8.urdf

<?xml version="1.0"?>
<robot name="chair">

  <!-- Base link at the top of the front right leg -->
  <link name="chair_link">
    <visual>
      <geometry>
        <sphere radius="0.0005932584269662922"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
      <material name="invisible">
        <color rgba="0 0 0 0"/>
      </material>
    </visual>
    <collision name="chair">
      <geometry>
        <sphere radius="0.0005932584269662922"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
    </collision>
    <inertial>
      <mass value="0.00020880060257968795"/>
      <inertia ixx="7.348853325284146e-08" ixy="0.0" ixz="0.0" iyy="7.348853325284146e-08" iyz="0.0" izz="7.348853325284146e-08"/>
    </inertial>
  </link>

  <!-- Base link at the top of the front right leg -->
  <link name="base">
    <visual>
      <geometry>
        <sphere radius="0.0005932584269662922"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
      <material name="invisible">
        <color rgba="0 0 0 0"/>
      </material>
    </visual>
    <inertial>
      <mass value="0.00020880060257968795"/>
      <inertia ixx="7.348853325284146e-08" ixy="0.0" ixz="0.0" iyy="7.348853325284146e-08" iyz="0.0" izz="7.348853325284146e-08"/>
    </inertial>
  </link>

  <!-- Seat -->
  <link name="seat">
    <visual>
      <geometry>
        <box size="0.21357303370786518 0.23137078651685394 0.011865168539325843"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
      <material name="wood">
        <color rgba="0.6 0.4 0.2 1.0"/>
      </material>
    </visual>
    <collision>
      <geometry>
        <box size="0.21357303370786518 0.23137078651685394 0.011865168539325843"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
    </collision>
    <inertial>
      <mass value="0.20880060257968794"/>
      <inertia ixx="0.0008818623990340976" ixy="0.0" ixz="0.0" iyy="0.0007348853325284146" iyz="0.0" izz="0.0014697706650568293"/>
    </inertial>
  </link>

  <!-- Front left leg -->
  <link name="front_left_leg">
    <visual>
      <geometry>
        <cylinder radius="0.011865168539325843" length="0.26103370786516855"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
      <material name="wood">
        <color rgba="0.6 0.4 0.2 1.0"/>
      </material>
    </visual>
    <collision>
      <geometry>
        <cylinder radius="0.011865168539325843" length="0.26103370786516855"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
    </collision>
    <inertial>
      <mass value="0.0020880060257968793"/>
      <inertia ixx="7.348853325284147e-05" ixy="0.0" ixz="0.0" iyy="7.348853325284147e-05" iyz="0.0" izz="7.3488533252841466e-06"/>
    </inertial>
  </link>

  <!-- Front right leg -->
  <link name="front_right_leg">
    <visual>
      <geometry>
        <cylinder radius="0.011865168539325843" length="0.26103370786516855"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
      <material name="wood">
        <color rgba="0.6 0.4 0.2 1.0"/>
      </material>
    </visual>
    <collision>
      <geometry>
        <cylinder radius="0.011865168539325843" length="0.26103370786516855"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
    </collision>
    <inertial>
      <mass value="0.0020880060257968793"/>
      <inertia ixx="7.348853325284147e-05" ixy="0.0" ixz="0.0" iyy="7.348853325284147e-05" iyz="0.0" izz="7.3488533252841466e-06"/>
    </inertial>
  </link>

  <!-- Back left leg -->
  <link name="back_left_leg">
    <visual>
      <geometry>
        <cylinder radius="0.011865168539325843" length="0.26103370786516855"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
      <material name="wood">
        <color rgba="0.6 0.4 0.2 1.0"/>
      </material>
    </visual>
    <collision>
      <geometry>
        <cylinder radius="0.011865168539325843" length="0.26103370786516855"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
    </collision>
    <inertial>
      <mass value="0.0020880060257968793"/>
      <inertia ixx="7.348853325284147e-05" ixy="0.0" ixz="0.0" iyy="7.348853325284147e-05" iyz="0.0" izz="7.3488533252841466e-06"/>
    </inertial>
  </link>

  <!-- Back right leg -->
  <link name="back_right_leg">
    <visual>
      <geometry>
        <cylinder radius="0.011865168539325843" length="0.26103370786516855"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
      <material name="wood">
        <color rgba="0.6 0.4 0.2 1.0"/>
      </material>
    </visual>
    <collision>
      <geometry>
        <cylinder radius="0.011865168539325843" length="0.26103370786516855"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
    </collision>
    <inertial>
      <mass value="0.0020880060257968793"/>
      <inertia ixx="7.348853325284147e-05" ixy="0.0" ixz="0.0" iyy="7.348853325284147e-05" iyz="0.0" izz="7.3488533252841466e-06"/>
    </inertial>
  </link>

  <!-- Backrest (tilted back support) -->
  <link name="backrest">
    <visual>
      <geometry>
        <box size="0.21357303370786518 0.008898876404494382 0.24323595505617976"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
      <material name="wood">
        <color rgba="0.6 0.4 0.2 1.0"/>
      </material>
    </visual>
    <collision>
      <geometry>
        <box size="0.21357303370786518 0.008898876404494382 0.24323595505617976"/>
      </geometry>
      <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
    </collision>
    <inertial>
      <mass value="0.10440030128984397"/>
      <inertia ixx="0.0008818623990340976" ixy="0.0" ixz="0.0" iyy="0.0014697706650568293" iyz="0.0" izz="0.0007348853325284146"/>
    </inertial>
  </link>

  <!-- Joint connecting base_link to seat -->

  <joint name="baselink_to_base" type="fixed">
    <parent link="chair_link"/>
    <child link="base"/>
    <origin xyz="0.0 0.0 0.0" rpy="0 0 0"/>
  </joint>

  <joint name="base_to_seat" type="fixed">
    <parent link="base"/>
    <child link="seat"/>
    <origin xyz="0.09492134831460675 -0.10678651685393259 0.0" rpy="0 0 0"/>
  </joint>

  <!-- Joint connecting front left leg to seat -->
  <joint name="seat_to_front_left_leg" type="fixed">
    <parent link="seat"/>
    <child link="front_left_leg"/>
    <origin xyz="0.08898876404494382 0.08898876404494382 -0.1364494382022472" rpy="0 0 0"/>
  </joint>

  <!-- Joint connecting front right leg to seat -->
  <joint name="seat_to_front_right_leg" type="fixed">
    <parent link="seat"/>
    <child link="front_right_leg"/>
    <origin xyz="0.08898876404494382 -0.08898876404494382 -0.1364494382022472" rpy="0 0 0"/>
  </joint>

  <!-- Joint connecting back left leg to seat -->
  <joint name="seat_to_back_left_leg" type="fixed">
    <parent link="seat"/>
    <child link="back_left_leg"/>
    <origin xyz="-0.08898876404494382 0.08898876404494382 -0.1364494382022472" rpy="0 0 0"/>
  </joint>

  <!-- Joint connecting back right leg to seat -->
  <joint name="seat_to_back_right_leg" type="fixed">
    <parent link="seat"/>
    <child link="back_right_leg"/>
    <origin xyz="-0.08898876404494382 -0.08898876404494382 -0.1364494382022472" rpy="0 0 0"/>
  </joint>

  <!-- Joint connecting backrest to seat (tilted back 15 degrees) -->
  <joint name="seat_to_backrest" type="fixed">
    <parent link="seat"/>
    <child link="backrest"/>
    <origin xyz="0.0 -0.1364494382022472 0.11865168539325843" rpy="0.21 0 0"/>
  </joint>

</robot>