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cassie_mass.xml
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<!-- Cassie simulation model developed by the Dynamic Robotics Laboratory -->
<mujoco model='cassie'>
<compiler inertiafromgeom='auto' angle='degree' eulerseq='zyx' meshdir='cassie-stl-meshes'/>
<size nuser_actuator='1' nuser_sensor='1' nuser_geom='1'/>
<option timestep='0.0005' iterations='50' solver='PGS' gravity='0 0 -9.81'/>
<!-- Timestep is set to 0.0005 because our controller runs at 2 kHz -->
<!-- Larger values still have stable dynamics -->
<visual>
<quality shadowsize='4096'/>
<map znear='0.05'/>
</visual>
<default>
<joint limited='true'/>
<motor ctrllimited='true'/>
<geom contype='0' conaffinity='0' condim='1' solref='0.005 1'/>
<equality solref='0.005 1'/>
<default class='cassie'>
<geom material='cassie'/>
</default>
<default class='collision'>
<!-- User parameter for geoms is used to identify collision types -->
<geom material='collision' contype='1' user='2'/>
<default class='collision-left'>
<geom contype='2' conaffinity='4'/>
</default>
<default class='collision-right'>
<geom contype='4' conaffinity='2'/>
</default>
</default>
<default class='obstacle'>
<geom material='obstacle' condim='3' contype='8' conaffinity='15' user='1'/>
</default>
</default>
<asset>
<texture type='skybox' builtin='gradient' width='128' height='128' rgb1='0.4 0.6 0.8' rgb2='0 0 0'/>
<texture name='plane' type='2d' builtin='checker' rgb1='0.2 0.2 0.2' rgb2='0.3 0.3 0.3' width='512' height='512'/>
<material name='plane' reflectance='0.0' texture='plane' texrepeat='1 1' texuniform='true'/>
<material name='cassie' rgba='0.9 0.5 0.1 1'/>
<material name='collision' rgba='0.1 0.5 0.9 0'/>
<material name='obstacle' rgba='0.2 0.6 0.2 1'/>
<mesh name='cassie-pelvis' file='pelvis.stl'/>
<mesh name='left-hip-roll' file='hip-roll.stl'/>
<mesh name='left-hip-yaw' file='hip-yaw.stl'/>
<mesh name='left-hip-pitch' file='hip-pitch.stl'/>
<mesh name='left-achilles-rod' file='achilles-rod.stl'/>
<mesh name='left-knee' file='knee.stl'/>
<mesh name='left-knee-spring' file='knee-spring.stl'/>
<mesh name='left-shin' file='shin.stl'/>
<mesh name='left-tarsus' file='tarsus.stl'/>
<mesh name='left-heel-spring' file='heel-spring.stl'/>
<mesh name='left-foot-crank' file='foot-crank.stl'/>
<mesh name='left-plantar-rod' file='plantar-rod.stl'/>
<mesh name='left-foot' file='foot.stl'/>
<mesh name='right-hip-roll' scale='1 -1 1' file='hip-roll.stl'/>
<mesh name='right-hip-yaw' scale='1 -1 1' file='hip-yaw.stl'/>
<mesh name='right-hip-pitch' scale='1 1 -1' file='hip-pitch.stl'/>
<mesh name='right-achilles-rod' scale='1 1 -1' file='achilles-rod.stl'/>
<mesh name='right-knee' scale='1 1 -1' file='knee.stl'/>
<mesh name='right-knee-spring' scale='1 1 -1' file='knee-spring.stl'/>
<mesh name='right-shin' scale='1 1 -1' file='shin.stl'/>
<mesh name='right-tarsus' scale='1 1 -1' file='tarsus.stl'/>
<mesh name='right-heel-spring' scale='1 1 -1' file='heel-spring.stl'/>
<mesh name='right-foot-crank' scale='1 1 -1' file='foot-crank.stl'/>
<mesh name='right-plantar-rod' scale='1 1 -1' file='plantar-rod.stl'/>
<mesh name='right-foot' scale='1 1 -1' file='foot.stl'/>
</asset>
<worldbody>
<geom name='floor' pos='0.0 0 -0.01' size='100 5 .125' type='plane' material='plane' condim='3' conaffinity='15' priority="1"/>
<light mode='trackcom' pos='0 0 5' dir='0 0 -1'/>
<light directional='true' pos='0 0 3' dir='0 0 -1' diffuse='0.2 0.2 0.2' specular='0 0 0'/>
<body name='cassie-pelvis' pos='0 0 1.01' childclass='cassie'>
<camera name='track' pos='0 -3 1' zaxis='0 -1 0.5' mode='track'/>
<inertial pos='0.05066 0.000346 0.02841' mass='10.33' fullinertia='0.085821 0.049222 0.08626 1.276e-05 -0.00016022 -0.000414'/>
<joint type='slide' axis='1 0 0' limited='false'/>
<joint type='slide' axis='0 1 0' limited='false'/>
<joint type='slide' axis='0 0 1' limited='false' ref='1.01'/>
<joint type='ball' limited='false'/>
<geom type='mesh' mesh='cassie-pelvis'/>
<geom type='sphere' size='0.15' pos='0.02 0 0.02' class='collision'/>
<site name='imu' size='0.01' pos='0.03155 0 -0.07996'/>
<body name='load_mass' pos='0 0 0.2' childclass='cassie'>
<inertial pos='0.0 0.0 0.0' mass='100.0'/>
<geom type='sphere' size='0.05' pos='0.00 0 0.00'/>
</body>
<body name='left-hip-roll' pos='0.021 0.135 0' xyaxes='0 0 -1 0 1 0'>
<inertial pos='-0.01793 0.0001 -0.04428' mass='1.82' fullinertia='0.003431 0.003793 0.002135 -6.65e-07 -0.00084 3.99e-06'/>
<joint name='left-hip-roll' type='hinge' range='-15 22.5' damping='1' armature='0.038125'/>
<geom type='mesh' mesh='left-hip-roll'/>
<body name='left-hip-yaw' pos='0 0 -0.07' xyaxes='0 0 1 0 1 0'>
<inertial pos='0 -1e-05 -0.034277' mass='1.171' fullinertia='0.002443 0.002803 0.000842 -4e-08 2.462e-07 -2.71e-08'/>
<joint name='left-hip-yaw' type='hinge' range='-22.5 22.5' damping='1' armature='0.038125'/>
<geom type='mesh' mesh='left-hip-yaw'/>
<body name='left-hip-pitch' pos='0 0 -0.09' xyaxes='0 0 -1 1 0 0'>
<inertial pos='0.05946 5e-05 -0.03581' mass='5.52' fullinertia='0.010898 0.029714 0.030257 -0.0002669 -5.721e-05 9.17e-06'/>
<joint name='left-hip-pitch' type='hinge' range='-50 80' damping='1' armature='0.09344'/>
<geom type='mesh' mesh='left-hip-pitch'/>
<geom type='capsule' size='0.08' fromto='0 0 -0.04 0.12 0 -0.0355' class='collision'/>
<body name='left-achilles-rod' pos='0 0 0.045' xyaxes='0.7922 -0.60599 -0.072096 0.60349 0.79547 -0.054922'>
<inertial pos='0.24719 0 0' mass='0.1567' fullinertia='3.754e-06 0.004487 0.004488 -3.74e-08 -1.61e-08 0'/>
<joint name='left-achilles-rod' type='ball' limited='false' damping='0.01'/>
<geom type='mesh' mesh='left-achilles-rod'/>
</body>
<body name='left-knee' pos='0.12 0 0.0045' xyaxes='0.70711 -0.70711 0 0.70711 0.70711 0'>
<inertial pos='0.023 0.03207 -0.002181' mass='0.7578' fullinertia='0.001376 0.0010335 0.0021637 -0.00039744 -4.085e-05 -5.374e-05'/>
<joint name='left-knee' type='hinge' ref='-45' range='-164 -37' damping='1' armature='0.09344'/>
<geom type='mesh' mesh='left-knee'/>
<body name='left-knee-spring' pos='0.06068 0.08241 0'>
<inertial pos='0.0836 0.0034 0' mass='0.186' fullinertia='5.215e-05 0.00041205 0.0003669 6.87e-06 0 0'/>
<geom type='mesh' mesh='left-knee-spring'/>
</body>
<body name='left-shin' pos='0.06068 0.04741 0'>
<inertial pos='0.18338 0.001169 0.0002123' mass='0.577' fullinertia='0.00035939 0.014728 0.014707 -0.00020981 2.266e-05 -1.2e-07'/>
<joint name='left-shin' type='hinge' range='-20 20' stiffness='1500' damping='0.1'/>
<geom type='mesh' mesh='left-shin'/>
<geom type='capsule' size='0.04' fromto='0 0 0 0.43476 0.02 0' class='collision-left'/>
<body name='left-tarsus' pos='0.43476 0.02 0' xyaxes='0.52992 0.84805 0 -0.84805 0.52992 0'>
<inertial pos='0.11046 -0.03058 -0.00131' mass='0.782' fullinertia='0.00039238 0.013595 0.013674 0.00023651 -4.987e-05 -4.82e-06'/>
<joint name='left-tarsus' type='hinge' ref='58' range='50 170' damping='0.1'/>
<geom type='mesh' mesh='left-tarsus'/>
<geom type='capsule' size='0.04' fromto='-0.01269 -0.03059 0.00092 0.408 -0.04 0' class='collision-left'/>
<body name='left-heel-spring' pos='-0.01269 -0.03059 0.00092' xyaxes='-0.91211 0.40829 0.036948 -0.40992 -0.90952 -0.068841'>
<inertial pos='0.081 0.0022 0' mass='0.126' fullinertia='2.959e-05 0.00022231 0.0002007 7.15e-06 -6e-07 1e-07'/>
<joint name='left-heel-spring' type='hinge' limited='false' stiffness='1250'/>
<geom type='mesh' mesh='left-heel-spring'/>
</body>
<body name='left-foot-crank' pos='0.058 -0.034 0.02275'>
<inertial pos='0.00493 2e-05 -0.00215' mass='0.1261' fullinertia='2.6941e-05 4.9621e-05 6.3362e-05 -2.1e-09 -3.9623e-06 -1.09e-08'/>
<joint name='left-foot-crank' type='hinge' range='-140 -30' damping='1'/>
<geom type='mesh' mesh='left-foot-crank'/>
<body name='left-plantar-rod' pos='0.055 0 -0.00791'>
<inertial pos='0.17792 0 0' mass='0.1186' fullinertia='2.779e-06 0.001774 0.001775 -2.34e-08 -8.1e-09 0'/>
<joint name='left-plantar-rod' type='hinge' limited='false'/>
<geom type='mesh' mesh='left-plantar-rod'/>
</body>
</body>
<body name='left-foot' pos='0.408 -0.04 0'>
<inertial pos='0.00474 0.02748 -0.00014' mass='0.1498' fullinertia='0.00017388 0.00016793 0.00033261 0.00011814 1.36e-06 -4e-07'/>
<joint name='left-foot' type='hinge' range='-140 -30' damping='1' armature='0.01225'/>
<geom type='mesh' mesh='left-foot'/>
<geom type='capsule' size='0.02' fromto='-0.052821 0.092622 0 0.069746 -0.010224 0' class='collision-left'/>
</body>
</body>
</body>
</body>
</body>
</body>
</body>
<body name='right-hip-roll' pos='0.021 -0.135 0' xyaxes='0 0 -1 0 1 0'>
<inertial pos='-0.01793 0.0001 -0.04428' mass='1.82' fullinertia='0.003431 0.003793 0.002135 6.65e-07 -0.00084 -3.99e-06'/>
<joint name='right-hip-roll' type='hinge' range='-22.5 15' damping='1' armature='0.038125'/>
<geom type='mesh' mesh='right-hip-roll'/>
<body name='right-hip-yaw' pos='0 0 -0.07' xyaxes='0 0 1 0 1 0'>
<inertial pos='0 1e-05 -0.034277' mass='1.171' fullinertia='0.002443 0.002803 0.000842 4e-08 2.462e-07 2.71e-08'/>
<joint name='right-hip-yaw' type='hinge' range='-22.5 22.5' damping='1' armature='0.038125'/>
<geom type='mesh' mesh='right-hip-yaw'/>
<body name='right-hip-pitch' pos='0 0 -0.09' xyaxes='0 0 -1 1 0 0'>
<inertial pos='0.05946 5e-05 0.03581' mass='5.52' fullinertia='0.010898 0.029714 0.030257 -0.0002669 5.721e-05 -9.17e-06'/>
<joint name='right-hip-pitch' type='hinge' range='-50 80' damping='1' armature='0.09344'/>
<geom type='mesh' mesh='right-hip-pitch'/>
<geom type='capsule' size='0.08' fromto='0 0 0.04 0.12 0 0.0355' class='collision'/>
<body name='right-achilles-rod' pos='0 0 -0.045' xyaxes='0.7922 -0.60599 0.072096 0.60349 0.79547 0.054922'>
<inertial pos='0.24719 0 0' mass='0.1567' fullinertia='3.754e-06 0.004487 0.004488 -3.74e-08 1.61e-08 0'/>
<joint name='right-achilles-rod' type='ball' limited='false' damping='0.01'/>
<geom type='mesh' mesh='right-achilles-rod'/>
</body>
<body name='right-knee' pos='0.12 0 -0.0045' xyaxes='0.70711 -0.70711 0 0.70711 0.70711 0'>
<inertial pos='0.023 0.03207 0.002181' mass='0.7578' fullinertia='0.001376 0.0010335 0.0021637 -0.00039744 4.085e-05 5.374e-05'/>
<joint name='right-knee' type='hinge' ref='-45' range='-164 -37' damping='1' armature='0.09344'/>
<geom type='mesh' mesh='right-knee'/>
<body name='right-knee-spring' pos='0.06068 0.08241 0'>
<inertial pos='0.0836 0.0034 0' mass='0.186' fullinertia='5.215e-05 0.00041205 0.0003669 6.87e-06 0 0'/>
<geom type='mesh' mesh='right-knee-spring'/>
</body>
<body name='right-shin' pos='0.06068 0.04741 0'>
<inertial pos='0.18338 0.001169 -0.0002123' mass='0.577' fullinertia='0.00035939 0.014728 0.014707 -0.00020981 -2.266e-05 1.2e-07'/>
<joint name='right-shin' type='hinge' range='-20 20' stiffness='1500' damping='0.1'/>
<geom type='mesh' mesh='right-shin'/>
<geom type='capsule' size='0.04' fromto='0 0 0 0.43476 0.02 0' class='collision-right'/>
<body name='right-tarsus' pos='0.43476 0.02 0' xyaxes='0.52992 0.84805 0 -0.84805 0.52992 0'>
<inertial pos='0.11046 -0.03058 0.00131' mass='0.782' fullinertia='0.00039238 0.013595 0.013674 0.00023651 4.987e-05 4.82e-06'/>
<joint name='right-tarsus' type='hinge' ref='58' range='50 170' damping='0.1'/>
<geom type='mesh' mesh='right-tarsus'/>
<geom type='capsule' size='0.04' fromto='-0.01269 -0.03059 -0.00092 0.408 -0.04 0' class='collision-right'/>
<body name='right-heel-spring' pos='-0.01269 -0.03059 -0.00092' xyaxes='-0.91211 0.40829 -0.036948 -0.40992 -0.90952 0.068841'>
<inertial pos='0.081 0.0022 0' mass='0.126' fullinertia='2.959e-05 0.00022231 0.0002007 7.15e-06 6e-07 -1e-07'/>
<joint name='right-heel-spring' type='hinge' limited='false' stiffness='1250'/>
<geom type='mesh' mesh='right-heel-spring'/>
</body>
<body name='right-foot-crank' pos='0.058 -0.034 -0.02275'>
<inertial pos='0.00493 2e-05 0.00215' mass='0.1261' fullinertia='2.6941e-05 4.9621e-05 6.3362e-05 -2.1e-09 3.9623e-06 1.09e-08'/>
<joint name='right-foot-crank' type='hinge' range='-140 -30' damping='1'/>
<geom type='mesh' mesh='right-foot-crank'/>
<body name='right-plantar-rod' pos='0.055 0 0.00791'>
<inertial pos='0.17792 0 0' mass='0.1186' fullinertia='2.779e-06 0.001774 0.001775 -2.34e-08 8.1e-09 0'/>
<joint name='right-plantar-rod' type='hinge' limited='false'/>
<geom type='mesh' mesh='right-plantar-rod'/>
</body>
</body>
<body name='right-foot' pos='0.408 -0.04 0'>
<inertial pos='0.00474 0.02748 0.00014' mass='0.1498' fullinertia='0.00017388 0.00016793 0.00033261 0.00011814 -1.36e-06 4e-07'/>
<joint name='right-foot' type='hinge' range='-140 -30' damping='1' armature='0.01225'/>
<geom type='mesh' mesh='right-foot'/>
<geom type='capsule' size='0.02' fromto='-0.052821 0.092622 0 0.069746 -0.010224 0' class='collision-right'/>
</body>
</body>
</body>
</body>
</body>
</body>
</body>
</body>
<!-- Add any other moving bodies after the Cassie definition -->
<!-- <body name='box' pos='2 0 0.2'> -->
<!-- <freejoint/> -->
<!-- <geom type='box' size='0.1 0.1 0.1' mass='3' class='obstacle'/> -->
<!-- </body> -->
</worldbody>
<equality>
<connect body1='left-plantar-rod' body2='left-foot' anchor='0.35012 0 0'/>
<connect body1='left-achilles-rod' body2='left-heel-spring' anchor='0.5012 0 0'/>
<connect body1='right-plantar-rod' body2='right-foot' anchor='0.35012 0 0'/>
<connect body1='right-achilles-rod' body2='right-heel-spring' anchor='0.5012 0 0'/>
</equality>
<actuator>
<!-- User parameter is the maximum no-load motor RPM -->
<motor name='left-hip-roll' joint='left-hip-roll' gear='25' ctrllimited='true' ctrlrange='-4.5 4.5' user='2900'/>
<motor name='left-hip-yaw' joint='left-hip-yaw' gear='25' ctrllimited='true' ctrlrange='-4.5 4.5' user='2900'/>
<motor name='left-hip-pitch' joint='left-hip-pitch' gear='16' ctrllimited='true' ctrlrange='-12.2 12.2' user='1300'/>
<motor name='left-knee' joint='left-knee' gear='16' ctrllimited='true' ctrlrange='-12.2 12.2' user='1300'/>
<motor name='left-foot' joint='left-foot' gear='50' ctrllimited='true' ctrlrange='-0.9 0.9' user='5500'/>
<motor name='right-hip-roll' joint='right-hip-roll' gear='25' ctrllimited='true' ctrlrange='-4.5 4.5' user='2900'/>
<motor name='right-hip-yaw' joint='right-hip-yaw' gear='25' ctrllimited='true' ctrlrange='-4.5 4.5' user='2900'/>
<motor name='right-hip-pitch' joint='right-hip-pitch' gear='16' ctrllimited='true' ctrlrange='-12.2 12.2' user='1300'/>
<motor name='right-knee' joint='right-knee' gear='16' ctrllimited='true' ctrlrange='-12.2 12.2' user='1300'/>
<motor name='right-foot' joint='right-foot' gear='50' ctrllimited='true' ctrlrange='-0.9 0.9' user='5500'/>
</actuator>
<sensor>
<!-- User parameter is the number of absolute encoder bits -->
<actuatorpos name='left-hip-roll-input' actuator='left-hip-roll' user='13'/>
<actuatorpos name='left-hip-yaw-input' actuator='left-hip-yaw' user='13'/>
<actuatorpos name='left-hip-pitch-input' actuator='left-hip-pitch' user='13'/>
<actuatorpos name='left-knee-input' actuator='left-knee' user='13'/>
<actuatorpos name='left-foot-input' actuator='left-foot' user='18'/>
<jointpos name='left-shin-output' joint='left-shin' user='18' noise='2e-4'/>
<jointpos name='left-tarsus-output' joint='left-tarsus' user='18' noise='2e-4'/>
<jointpos name='left-foot-output' joint='left-foot' user='13'/>
<actuatorpos name='right-hip-roll-input' actuator='right-hip-roll' user='13'/>
<actuatorpos name='right-hip-yaw-input' actuator='right-hip-yaw' user='13'/>
<actuatorpos name='right-hip-pitch-input' actuator='right-hip-pitch' user='13'/>
<actuatorpos name='right-knee-input' actuator='right-knee' user='13'/>
<actuatorpos name='right-foot-input' actuator='right-foot' user='18'/>
<jointpos name='right-shin-output' joint='right-shin' user='18' noise='2e-4'/>
<jointpos name='right-tarsus-output' joint='right-tarsus' user='18' noise='2e-4'/>
<jointpos name='right-foot-output' joint='right-foot' user='13'/>
<framequat name='pelvis-orientation' objtype='site' objname='imu'/>
<gyro name='pelvis-angular-velocity' site='imu' noise='5e-4' cutoff='34.9'/>
<accelerometer name='pelvis-linear-acceleration' site='imu' noise='1e-2' cutoff='157'/>
<magnetometer name='pelvis-magnetometer' site='imu'/>
</sensor>
</mujoco>