diff --git a/data/quadruped/minitaur_derpy.urdf b/data/quadruped/minitaur_derpy.urdf
new file mode 100644
index 000000000..030a297cb
--- /dev/null
+++ b/data/quadruped/minitaur_derpy.urdf
@@ -0,0 +1,949 @@
+<?xml version="0.0" ?>
+<!-- ======================================================================= -->
+<!--LICENSE:                                                                 -->
+<!--Copyright (c) 2017, Erwin Coumans                                        -->
+<!--Google Inc.                                                              -->
+<!--All rights reserved.                                                     -->
+<!--                                                                         -->
+<!--Redistribution and use in source and binary forms, with or without       -->
+<!--modification, are permitted provided that the following conditions are   -->
+<!--met:                                                                     -->
+<!--                                                                         -->
+<!--1. Redistributions or derived work must retain this copyright notice,    -->
+<!--   this list of conditions and the following disclaimer.                 -->
+<!--                                                                         -->
+<!--2. Redistributions in binary form must reproduce the above copyright     -->
+<!--   notice, this list of conditions and the following disclaimer in the   -->
+<!--   documentation and/or other materials provided with the distribution.  -->
+<!--                                                                         -->
+<!--THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS  -->
+<!--IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,-->
+<!--THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR   -->
+<!--PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR        -->
+<!--CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,    -->
+<!--EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,      -->
+<!--PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR       -->
+<!--PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF   -->
+<!--LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING     -->
+<!--NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS       -->
+<!--SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.             -->
+
+<robot name="quadruped">
+  <link name="base_chassis_link">
+    <visual>
+      <geometry>
+        <box size=".295 0.142 .078"/>
+      </geometry>
+      <material name="black">
+        <color rgba="0.3 0.3 0.3 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <box size=".295 0.142 .078"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <origin rpy="0.0 0 0" xyz="0.05 0 0"/>
+      <mass value="1.81246"/>
+      <inertia ixx="0.00474833" ixy="0.0" ixz="0.0" iyy="0.01386899" iyz="0.0" izz="0.01577876"/>
+    </inertial>
+  </link>
+
+  <link name="chassis_right">
+    <visual>
+      <origin rpy="0 0 0" xyz="0 0 0"/>
+      <geometry>
+        <box size=".156 0.091 .050"/>
+      </geometry>
+      <material name="black">
+        <color rgba="0.3 0.3 0.3 1"/>
+      </material>
+    </visual>
+    <visual>
+      <origin rpy="0 0 0" xyz="0 0.0455 0"/>
+      <geometry>
+        <box size=".307 0.009 .050"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <visual>
+      <origin rpy="0 0 0" xyz="0 -0.0455 0"/>
+      <geometry>
+        <box size=".307 0.009 .050"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+
+    <collision>
+      <origin rpy="0 0 0" xyz="0 0.1165 0"/>
+      <geometry>
+        <box size=".156 0.091 .050"/>
+      </geometry>
+    </collision>
+    <collision>
+      <origin rpy="0 0 0" xyz="0 0.0455 0"/>
+      <geometry>
+        <box size=".307 0.009 .050"/>
+      </geometry>
+    </collision>
+    <collision>
+      <origin rpy="0 0 0" xyz="0 -0.0455 0"/>
+      <geometry>
+        <box size=".307 0.009 .050"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value=".72277"/>
+      <inertia ixx="0.00125923" ixy="0.0" ixz="0.0" iyy="0.00346491" iyz="0.0" izz="0.00420849"/>
+    </inertial>
+  </link>
+
+  <joint name="chassis_right_center" type="fixed">
+    <axis xyz="0 0 1"/>
+    <parent link="base_chassis_link"/>
+    <child link="chassis_right"/>
+    <origin rpy="-0.0872665 0 0" xyz="0.0 -0.1165 -0.011"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="chassis_left">
+    <visual>
+      <origin rpy="0 0 0" xyz="0 0 0"/>
+      <geometry>
+        <box size=".156 0.091 .050"/>
+      </geometry>
+      <material name="black">
+        <color rgba="0.3 0.3 0.3 1"/>
+      </material>
+    </visual>
+    <visual>
+      <origin rpy="0 0 0" xyz="0 0.0455 0"/>
+      <geometry>
+        <box size=".307 0.009 .050"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <visual>
+      <origin rpy="0 0 0" xyz="0 -0.0455 0"/>
+      <geometry>
+        <box size=".307 0.009 .050"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+
+    <collision>
+      <origin rpy="0 0 0" xyz="0 0.1165 0"/>
+      <geometry>
+        <box size=".156 0.091 .050"/>
+      </geometry>
+    </collision>
+    <collision>
+      <origin rpy="0 0 0" xyz="0 0.0455 0"/>
+      <geometry>
+        <box size=".307 0.009 .050"/>
+      </geometry>
+    </collision>
+    <collision>
+      <origin rpy="0 0 0" xyz="0 -0.0455 0"/>
+      <geometry>
+        <box size=".307 0.009 .050"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value=".72277"/>
+      <inertia ixx="0.00125923" ixy="0.0" ixz="0.0" iyy="0.00346491" iyz="0.0" izz="0.00420849"/>
+    </inertial>
+  </link>
+
+  <joint name="chassis_left_center" type="fixed">
+    <axis xyz="0 0 1"/>
+    <parent link="base_chassis_link"/>
+    <child link="chassis_left"/>
+    <origin rpy="0.0872665 0 0" xyz="0.0 0.1165 -0.011"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="motor_front_rightR_link">
+    <visual>
+      <geometry>
+        <mesh filename="tmotor3.obj" scale="1 1 1"/>
+      </geometry>
+      <material name="white">
+        <color rgba="1 1 1 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <cylinder length="0.059" radius="0.05268"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.402"/>
+      <inertia ixx="0.0003378" ixy="0.0" ixz="0.0" iyy="0.0012213" iyz="0.0" izz="0.001058"/>
+    </inertial>
+  </link>
+  <joint name="motor_front_rightR_joint" type="continuous">
+    <axis xyz="0 0 1"/>
+    <parent link="chassis_right"/>
+    <child link="motor_front_rightR_link"/>
+    <origin rpy="1.57075 0 0" xyz="0.20268 -0.0455 0"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="motor_front_rightL_link">
+    <visual>
+      <geometry>
+        <mesh filename="tmotor3.obj" scale="1 1 1"/>
+      </geometry>
+      <material name="white">
+        <color rgba="1 1 1 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <cylinder length="0.059" radius="0.05268"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.402"/>
+      <inertia ixx="0.0003378" ixy="0.0" ixz="0.0" iyy="0.0012213" iyz="0.0" izz="0.001058"/>
+    </inertial>
+  </link>
+  <joint name="motor_front_rightL_joint" type="continuous">
+    <axis xyz="0 0 1"/>
+    <parent link="chassis_right"/>
+    <child link="motor_front_rightL_link"/>
+    <origin rpy="1.57075 0 3.141592" xyz="0.20268 0.0455 0"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="motor_front_leftL_link">
+    <visual>
+      <geometry>
+        <mesh filename="tmotor3.obj" scale="1 1 1"/>
+      </geometry>
+      <material name="white">
+        <color rgba="1 1 1 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <cylinder length="0.059" radius="0.05268"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.402"/>
+      <inertia ixx="0.0003378" ixy="0.0" ixz="0.0" iyy="0.0012213" iyz="0.0" izz="0.001058"/>
+    </inertial>
+  </link>
+  <joint name="motor_front_leftL_joint" type="continuous">
+    <axis xyz="0 0 1"/>
+    <parent link="chassis_left"/>
+    <child link="motor_front_leftL_link"/>
+    <origin rpy="1.57075 0 3.141592" xyz="0.20268 0.0455 0"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="motor_front_leftR_link">
+    <visual>
+      <geometry>
+        <mesh filename="tmotor3.obj" scale="1 1 1"/>
+      </geometry>
+      <material name="white">
+        <color rgba="1 1 1 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <cylinder length="0.059" radius="0.05268"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.402"/>
+      <inertia ixx="0.0003378" ixy="0.0" ixz="0.0" iyy="0.0012213" iyz="0.0" izz="0.001058"/>
+    </inertial>
+  </link>
+  <joint name="motor_front_leftR_joint" type="continuous">
+    <axis xyz="0 0 1"/>
+    <parent link="chassis_left"/>
+    <child link="motor_front_leftR_link"/>
+    <origin rpy="1.57075 0 0" xyz="0.20268 -0.0455 0"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="motor_back_rightR_link">
+    <visual>
+      <geometry>
+        <mesh filename="tmotor3.obj" scale="1 1 1"/>
+      </geometry>
+      <material name="white">
+        <color rgba="1 1 1 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <cylinder length="0.059" radius="0.05268"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.402"/>
+      <inertia ixx="0.0003378" ixy="0.0" ixz="0.0" iyy="0.0012213" iyz="0.0" izz="0.001058"/>
+    </inertial>
+  </link>
+  <joint name="motor_back_rightR_joint" type="continuous">
+    <axis xyz="0 0 1"/>
+    <parent link="chassis_right"/>
+    <child link="motor_back_rightR_link"/>
+    <origin rpy="1.57075 0 0" xyz="-0.20268 -0.0455 0"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="motor_back_rightL_link">
+    <visual>
+      <geometry>
+        <mesh filename="tmotor3.obj" scale="1 1 1"/>
+      </geometry>
+      <material name="white">
+        <color rgba="1 1 1 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <cylinder length="0.059" radius="0.05268"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.402"/>
+      <inertia ixx="0.0003378" ixy="0.0" ixz="0.0" iyy="0.0012213" iyz="0.0" izz="0.001058"/>
+    </inertial>
+  </link>
+  <joint name="motor_back_rightL_joint" type="continuous">
+    <axis xyz="0 0 1"/>
+    <parent link="chassis_right"/>
+    <child link="motor_back_rightL_link"/>
+    <origin rpy="1.57075 0 3.141592" xyz="-0.20268 0.0455 0"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="motor_back_leftL_link">
+    <visual>
+      <geometry>
+        <mesh filename="tmotor3.obj" scale="1 1 1"/>
+      </geometry>
+      <material name="white">
+        <color rgba="1 1 1 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <cylinder length="0.059" radius="0.05268"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.402"/>
+      <inertia ixx="0.0003378" ixy="0.0" ixz="0.0" iyy="0.0012213" iyz="0.0" izz="0.001058"/>
+    </inertial>
+  </link>
+  <joint name="motor_back_leftL_joint" type="continuous">
+    <axis xyz="0 0 1"/>
+    <parent link="chassis_left"/>
+    <child link="motor_back_leftL_link"/>
+    <origin rpy="1.57075 0 3.141592" xyz="-0.20268 0.0455 0"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="motor_back_leftR_link">
+    <visual>
+      <geometry>
+        <mesh filename="tmotor3.obj" scale="1 1 1"/>
+      </geometry>
+      <material name="white">
+        <color rgba="1 1 1 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <cylinder length="0.059" radius="0.05268"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.402"/>
+      <inertia ixx="0.0003378" ixy="0.0" ixz="0.0" iyy="0.0012213" iyz="0.0" izz="0.001058"/>
+    </inertial>
+  </link>
+  <joint name="motor_back_leftR_joint" type="continuous">
+    <axis xyz="0 0 1"/>
+    <parent link="chassis_left"/>
+    <child link="motor_back_leftR_link"/>
+    <origin rpy="1.57075 0 0" xyz="-0.20268 -0.0455 0"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+
+  <link name="upper_leg_front_rightR_link">
+    <visual>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.026"/>
+      <inertia ixx="0.000038770" ixy="0.0" ixz="0.0" iyy="0.000042198" iyz="0.0"
+          izz="0.0000036030"/>
+    </inertial>
+  </link>
+  <joint name="hip_front_rightR_joint" type="fixed">
+    <axis xyz="0 0 1"/>
+    <parent link="motor_front_rightR_link"/>
+    <child link="upper_leg_front_rightR_link"/>
+    <origin rpy="-1.57075 0 0" xyz="0.0 0.045 -0.030"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="lower_leg_front_rightR_link">
+    <contact>
+      <friction_anchor/>
+      <stiffness value="30000.0"/>
+      <damping value="1000.0"/>
+      <spinning_friction value=".3"/>
+      <lateral_friction value="1"/>
+    </contact>
+
+    <visual>
+      <origin rpy="0.0 0 0" xyz="0 0 0.120"/>
+      <geometry>
+        <box size="0.017 0.0064 0.240"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <origin rpy="0.0 0 0" xyz="0 0 0.120"/>
+      <geometry>
+        <box size="0.017 0.0064 0.240"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <origin rpy="0.0 0 0" xyz="0 0 0.120"/>
+      <mass value="0.066"/>
+      <inertia ixx="0.00032459" ixy="0.0" ixz="0.0" iyy="0.00032637" iyz="0.0" izz="0.000002178"/>
+    </inertial>
+  </link>
+  <joint name="knee_front_rightR_joint" type="continuous">
+    <axis xyz="0 1 0"/>
+    <parent link="upper_leg_front_rightR_link"/>
+    <child link="lower_leg_front_rightR_link"/>
+    <origin rpy="0 0 0" xyz="0.0 0.01 .056"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="upper_leg_front_rightL_link">
+    <visual>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.026"/>
+      <inertia ixx="0.000038770" ixy="0.0" ixz="0.0" iyy="0.000042198" iyz="0.0"
+          izz="0.0000036030"/>
+    </inertial>
+  </link>
+  <joint name="hip_front_rightL_joint" type="fixed">
+    <axis xyz="0 0 1"/>
+    <parent link="motor_front_rightL_link"/>
+    <child link="upper_leg_front_rightL_link"/>
+    <origin rpy="-1.57075 0 0" xyz="0.0 0.045 -0.030"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="lower_leg_front_rightL_link">
+    <contact>
+      <friction_anchor/>
+      <stiffness value="30000.0"/>
+      <damping value="1000.0"/>
+      <spinning_friction value=".3"/>
+      <lateral_friction value="1"/>
+    </contact>
+
+    <visual>
+      <origin rpy="0.0 0 0" xyz="0 0 .108"/>
+      <geometry>
+        <box size="0.017 0.0064 0.216"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <origin rpy="0.0 0 0" xyz="0 0 .108"/>
+      <geometry>
+        <box size="0.017 0.0064 0.216"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <origin rpy="0.0 0 0" xyz="0 0 .1"/>
+      <mass value="0.055"/>
+      <inertia ixx="0.00023166" ixy="0.0" ixz="0.0" iyy="0.00023325" iyz="0.0" izz="0.00000198"/>
+    </inertial>
+  </link>
+  <joint name="knee_front_rightL_joint" type="continuous">
+    <axis xyz="0 1 0"/>
+    <parent link="upper_leg_front_rightL_link"/>
+    <child link="lower_leg_front_rightL_link"/>
+    <origin rpy="0 0 0" xyz="0.0 0.01 .056"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+
+  <link name="upper_leg_front_leftR_link">
+    <visual>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.026"/>
+      <inertia ixx="0.000038770" ixy="0.0" ixz="0.0" iyy="0.000042198" iyz="0.0"
+          izz="0.0000036030"/>
+    </inertial>
+  </link>
+  <joint name="hip_front_leftR_joint" type="fixed">
+    <axis xyz="0 0 1"/>
+    <parent link="motor_front_leftR_link"/>
+    <child link="upper_leg_front_leftR_link"/>
+    <origin rpy="-1.57075 0 0" xyz="0.0 0.045 -0.030"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="lower_leg_front_leftR_link">
+    <contact>
+      <friction_anchor/>
+      <stiffness value="30000.0"/>
+      <damping value="1000.0"/>
+      <spinning_friction value=".3"/>
+      <lateral_friction value="1"/>
+    </contact>
+
+    <visual>
+      <origin rpy="0.0 0 0" xyz="0 0 .108"/>
+      <geometry>
+        <box size="0.017 0.0064 0.216"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <origin rpy="0.0 0 0" xyz="0 0 .108"/>
+      <geometry>
+        <box size="0.017 0.0064 0.216"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <origin rpy="0.0 0 0" xyz="0 0 .1"/>
+      <mass value="0.055"/>
+      <inertia ixx="0.00023166" ixy="0.0" ixz="0.0" iyy="0.00023325" iyz="0.0" izz="0.00000198"/>
+    </inertial>
+  </link>
+  <joint name="knee_front_leftR_joint" type="continuous">
+    <axis xyz="0 1 0"/>
+    <parent link="upper_leg_front_leftR_link"/>
+    <child link="lower_leg_front_leftR_link"/>
+    <origin rpy="0 0 0" xyz="0.0 0.01 .056"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="upper_leg_front_leftL_link">
+    <visual>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.026"/>
+      <inertia ixx="0.000038770" ixy="0.0" ixz="0.0" iyy="0.000042198" iyz="0.0"
+          izz="0.0000036030"/>
+    </inertial>
+  </link>
+  <joint name="hip_front_leftL_joint" type="fixed">
+    <axis xyz="0 0 1"/>
+    <parent link="motor_front_leftL_link"/>
+    <child link="upper_leg_front_leftL_link"/>
+    <origin rpy="-1.57075 0 0" xyz="0.0 0.045 -0.030"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="lower_leg_front_leftL_link">
+    <contact>
+      <friction_anchor/>
+      <stiffness value="30000.0"/>
+      <damping value="1000.0"/>
+      <spinning_friction value=".3"/>
+      <lateral_friction value="1"/>
+    </contact>
+
+    <visual>
+      <origin rpy="0.0 0 0" xyz="0 0 0.120"/>
+      <geometry>
+        <box size="0.017 0.0064 0.240"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <origin rpy="0.0 0 0" xyz="0 0 0.120"/>
+      <geometry>
+        <box size="0.017 0.0064 0.240"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <origin rpy="0.0 0 0" xyz="0 0 0.120"/>
+      <mass value="0.066"/>
+      <inertia ixx="0.00032459" ixy="0.0" ixz="0.0" iyy="0.00032637" iyz="0.0" izz="0.000002178"/>
+    </inertial>
+  </link>
+  <joint name="knee_front_leftL_joint" type="continuous">
+    <axis xyz="0 1 0"/>
+    <parent link="upper_leg_front_leftL_link"/>
+    <child link="lower_leg_front_leftL_link"/>
+    <origin rpy="0 0 0" xyz="0.0 0.01 .056"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+
+  <link name="upper_leg_back_rightR_link">
+    <visual>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.026"/>
+      <inertia ixx="0.000038770" ixy="0.0" ixz="0.0" iyy="0.000042198" iyz="0.0"
+          izz="0.0000036030"/>
+    </inertial>
+  </link>
+  <joint name="hip_back_rightR_joint" type="fixed">
+    <axis xyz="0 0 1"/>
+    <parent link="motor_back_rightR_link"/>
+    <child link="upper_leg_back_rightR_link"/>
+    <origin rpy="-1.57075 0 0" xyz="0.0 0.045 -0.030"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="lower_leg_back_rightR_link">
+    <contact>
+      <friction_anchor/>
+      <stiffness value="30000.0"/>
+      <damping value="1000.0"/>
+      <spinning_friction value=".3"/>
+      <lateral_friction value="1"/>
+    </contact>
+
+    <visual>
+      <origin rpy="0.0 0 0" xyz="0 0 0.120"/>
+      <geometry>
+        <box size="0.017 0.0064 0.240"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <origin rpy="0.0 0 0" xyz="0 0 0.120"/>
+      <geometry>
+        <box size="0.017 0.0064 0.240"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <origin rpy="0.0 0 0" xyz="0 0 0.120"/>
+      <mass value="0.066"/>
+      <inertia ixx="0.00032459" ixy="0.0" ixz="0.0" iyy="0.00032637" iyz="0.0" izz="0.000002178"/>
+    </inertial>
+  </link>
+  <joint name="knee_back_rightR_joint" type="continuous">
+    <axis xyz="0 1 0"/>
+    <parent link="upper_leg_back_rightR_link"/>
+    <child link="lower_leg_back_rightR_link"/>
+    <origin rpy="0 0 0" xyz="0.0 0.01 .056"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="upper_leg_back_rightL_link">
+    <visual>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.026"/>
+      <inertia ixx="0.000038770" ixy="0.0" ixz="0.0" iyy="0.000042198" iyz="0.0"
+          izz="0.0000036030"/>
+    </inertial>
+  </link>
+  <joint name="hip_back_rightL_joint" type="fixed">
+    <axis xyz="0 0 1"/>
+    <parent link="motor_back_rightL_link"/>
+    <child link="upper_leg_back_rightL_link"/>
+    <origin rpy="-1.57075 0 0" xyz="0.0 0.045 -0.030"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="lower_leg_back_rightL_link">
+    <contact>
+      <friction_anchor/>
+      <stiffness value="30000.0"/>
+      <damping value="1000.0"/>
+      <spinning_friction value=".3"/>
+      <lateral_friction value="1"/>
+    </contact>
+
+    <visual>
+      <origin rpy="0.0 0 0" xyz="0 0 .108"/>
+      <geometry>
+        <box size="0.017 0.0064 0.216"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <origin rpy="0.0 0 0" xyz="0 0 .108"/>
+      <geometry>
+        <box size="0.017 0.0064 0.216"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <origin rpy="0.0 0 0" xyz="0 0 .1"/>
+      <mass value="0.055"/>
+      <inertia ixx="0.00023166" ixy="0.0" ixz="0.0" iyy="0.00023325" iyz="0.0" izz="0.00000198"/>
+    </inertial>
+  </link>
+  <joint name="knee_back_rightL_joint" type="continuous">
+    <axis xyz="0 1 0"/>
+    <parent link="upper_leg_back_rightL_link"/>
+    <child link="lower_leg_back_rightL_link"/>
+    <origin rpy="0 0 0" xyz="0.0 0.01 .056"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+
+  <link name="upper_leg_back_leftR_link">
+    <visual>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.026"/>
+      <inertia ixx="0.000038770" ixy="0.0" ixz="0.0" iyy="0.000042198" iyz="0.0"
+          izz="0.0000036030"/>
+    </inertial>
+  </link>
+  <joint name="hip_back_leftR_joint" type="fixed">
+    <axis xyz="0 0 1"/>
+    <parent link="motor_back_leftR_link"/>
+    <child link="upper_leg_back_leftR_link"/>
+    <origin rpy="-1.57075 0 0" xyz="0.0 0.045 -0.030"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="lower_leg_back_leftR_link">
+    <contact>
+      <friction_anchor/>
+      <stiffness value="30000.0"/>
+      <damping value="1000.0"/>
+      <spinning_friction value=".3"/>
+      <lateral_friction value="1"/>
+    </contact>
+
+    <visual>
+      <origin rpy="0.0 0 0" xyz="0 0 .108"/>
+      <geometry>
+        <box size="0.017 0.0064 0.216"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <origin rpy="0.0 0 0" xyz="0 0 .108"/>
+      <geometry>
+        <box size="0.017 0.0064 0.216"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <origin rpy="0.0 0 0" xyz="0 0 .1"/>
+      <mass value="0.055"/>
+      <inertia ixx="0.00023166" ixy="0.0" ixz="0.0" iyy="0.00023325" iyz="0.0" izz="0.00000198"/>
+    </inertial>
+  </link>
+  <joint name="knee_back_leftR_joint" type="continuous">
+    <axis xyz="0 1 0"/>
+    <parent link="upper_leg_back_leftR_link"/>
+    <child link="lower_leg_back_leftR_link"/>
+    <origin rpy="0 0 0" xyz="0.0 0.01 .056"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="upper_leg_back_leftL_link">
+    <visual>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <geometry>
+        <box size=".039 0.0064 .129"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <mass value="0.026"/>
+      <inertia ixx="0.000038770" ixy="0.0" ixz="0.0" iyy="0.000042198" iyz="0.0"
+          izz="0.0000036030"/>
+    </inertial>
+  </link>
+  <joint name="hip_back_leftL_joint" type="fixed">
+    <axis xyz="0 0 1"/>
+    <parent link="motor_back_leftL_link"/>
+    <child link="upper_leg_back_leftL_link"/>
+    <origin rpy="-1.57075 0 0" xyz="0.0 0.045 -0.030"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+  <link name="lower_leg_back_leftL_link">
+    <contact>
+      <friction_anchor/>
+      <stiffness value="30000.0"/>
+      <damping value="1000.0"/>
+      <spinning_friction value=".3"/>
+      <lateral_friction value="1"/>
+    </contact>
+
+    <visual>
+      <origin rpy="0.0 0 0" xyz="0 0 0.120"/>
+      <geometry>
+        <box size="0.017 0.0064 0.240"/>
+      </geometry>
+      <material name="grey">
+        <color rgba="0.65 0.65 0.75 1"/>
+      </material>
+    </visual>
+    <collision>
+      <origin rpy="0.0 0 0" xyz="0 0 0.120"/>
+      <geometry>
+        <box size="0.017 0.0064 0.240"/>
+      </geometry>
+    </collision>
+    <inertial>
+      <origin rpy="0.0 0 0" xyz="0 0 0.120"/>
+      <mass value="0.066"/>
+      <inertia ixx="0.00032459" ixy="0.0" ixz="0.0" iyy="0.00032637" iyz="0.0" izz="0.000002178"/>
+    </inertial>
+  </link>
+  <joint name="knee_back_leftL_joint" type="continuous">
+    <axis xyz="0 1 0"/>
+    <parent link="upper_leg_back_leftL_link"/>
+    <child link="lower_leg_back_leftL_link"/>
+    <origin rpy="0 0 0" xyz="0.0 0.01 .056"/>
+    <limit effort="100" velocity="100"/>
+    <joint_properties damping="0.0" friction="0.0"/>
+  </joint>
+
+</robot>
\ No newline at end of file
diff --git a/examples/pybullet/pybullet.c b/examples/pybullet/pybullet.c
index af6f463b0..4032fcb69 100644
--- a/examples/pybullet/pybullet.c
+++ b/examples/pybullet/pybullet.c
@@ -2902,7 +2902,7 @@ static PyObject* pybullet_getJointInfo(PyObject* self, PyObject* args, PyObject*
 				//          info.m_jointFriction);
 				PyTuple_SetItem(pyListJointInfo, 0, PyInt_FromLong(info.m_jointIndex));
 				
-				if (info.m_jointName)
+				if (info.m_jointName[0])
 				{
 					PyTuple_SetItem(pyListJointInfo, 1,
 								PyString_FromString(info.m_jointName));
@@ -2928,7 +2928,7 @@ static PyObject* pybullet_getJointInfo(PyObject* self, PyObject* args, PyObject*
 								PyFloat_FromDouble(info.m_jointMaxForce));
 				PyTuple_SetItem(pyListJointInfo, 11,
 								PyFloat_FromDouble(info.m_jointMaxVelocity));
-				if (info.m_linkName)
+				if (info.m_linkName[0])
 				{
 				
 					PyTuple_SetItem(pyListJointInfo, 12,