Bart/bullet3
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

update minitaur.py to use minitaur.urdf (instead of quadruped.urdf), also sort the legs in the same order as real hardware

Browse Source 
added test urdf files for minitaur with all fixed joints, or fixed knees.
added some stiffness/damping to minitaur legs (testing)
tiny_obj_loader, don't crash on invalid texture coordinates
btMultiBodyConstraintSolver: sweep back and forward to reduce asymmetry
This commit is contained in:
Erwin Coumans
2017-03-15 15:38:50 -07:00
parent a613911c84
commit 4db6fa9e29
11 changed files with 2043 additions and 118 deletions
Download Patch File Download Diff File Expand all files Collapse all files

89
examples/pybullet/minitaur.py
View File

@@ -17,10 +17,10 @@ class Minitaur:
p.stepSimulation()
def buildMotorIdList(self):
self.motorIdList.append(self.jointNameToId['motor_front_leftR_joint'])
self.motorIdList.append(self.jointNameToId['motor_front_leftL_joint'])
self.motorIdList.append(self.jointNameToId['motor_back_leftR_joint'])
self.motorIdList.append(self.jointNameToId['motor_front_leftR_joint'])
self.motorIdList.append(self.jointNameToId['motor_back_leftL_joint'])
self.motorIdList.append(self.jointNameToId['motor_back_leftR_joint'])
self.motorIdList.append(self.jointNameToId['motor_front_rightL_joint'])
self.motorIdList.append(self.jointNameToId['motor_front_rightR_joint'])
self.motorIdList.append(self.jointNameToId['motor_back_rightL_joint'])
@@ -28,21 +28,17 @@ class Minitaur:
def reset(self):
self.quadruped = p.loadURDF("%s/quadruped/quadruped.urdf" % self.urdfRootPath,0,0,.3)
self.quadruped = p.loadURDF("%s/quadruped/minitaur.urdf" % self.urdfRootPath,0,0,.2)
self.kp = 1
self.kd = 0.1
self.maxForce = 3.5
self.nMotors = 8
self.motorIdList = []
self.motorDir = [1, -1, 1, -1, -1, 1, -1, 1]
self.motorDir = [1, 1, 1, 1, 1, 1, 1, 1]
self.buildJointNameToIdDict()
self.buildMotorIdList()
def disableAllMotors(self):
nJoints = p.getNumJoints(self.quadruped)
for i in range(nJoints):
p.setJointMotorControl2(bodyIndex=self.quadruped, jointIndex=i, controlMode=p.VELOCITY_CONTROL, force=0)
def setMotorAngleById(self, motorId, desiredAngle):
p.setJointMotorControl2(bodyIndex=self.quadruped, jointIndex=motorId, controlMode=p.POSITION_CONTROL, targetPosition=desiredAngle, positionGain=self.kp, velocityGain=self.kd, force=self.maxForce)
@@ -51,42 +47,55 @@ class Minitaur:
self.setMotorAngleById(self.jointNameToId[motorName], desiredAngle)
def resetPose(self):
#right front leg
self.disableAllMotors()
p.resetJointState(self.quadruped,self.jointNameToId['motor_front_rightR_joint'],1.57)
p.resetJointState(self.quadruped,self.jointNameToId['knee_front_rightR_link'],-2.2)
p.resetJointState(self.quadruped,self.jointNameToId['motor_front_rightL_joint'],-1.57)
p.resetJointState(self.quadruped,self.jointNameToId['knee_front_rightL_link'],2.2)
p.createConstraint(self.quadruped,self.jointNameToId['knee_front_rightR_link'],self.quadruped,self.jointNameToId['knee_front_rightL_link'],p.JOINT_POINT2POINT,[0,0,0],[0,0.01,0.2],[0,-0.015,0.2])
self.setMotorAngleByName('motor_front_rightR_joint', 1.57)
self.setMotorAngleByName('motor_front_rightL_joint',-1.57)
kneeFrictionForce = 0
halfpi = 1.57079632679
kneeangle = -2.1834 #halfpi - acos(upper_leg_length / lower_leg_length)
#left front leg
p.resetJointState(self.quadruped,self.jointNameToId['motor_front_leftR_joint'],1.57)
p.resetJointState(self.quadruped,self.jointNameToId['knee_front_leftR_link'],-2.2)
p.resetJointState(self.quadruped,self.jointNameToId['motor_front_leftL_joint'],-1.57)
p.resetJointState(self.quadruped,self.jointNameToId['knee_front_leftL_link'],2.2)
p.createConstraint(self.quadruped,self.jointNameToId['knee_front_leftR_link'],self.quadruped,self.jointNameToId['knee_front_leftL_link'],p.JOINT_POINT2POINT,[0,0,0],[0,-0.01,0.2],[0,0.015,0.2])
self.setMotorAngleByName('motor_front_leftR_joint', 1.57)
self.setMotorAngleByName('motor_front_leftL_joint',-1.57)
#right back leg
p.resetJointState(self.quadruped,self.jointNameToId['motor_back_rightR_joint'],1.57)
p.resetJointState(self.quadruped,self.jointNameToId['knee_back_rightR_link'],-2.2)
p.resetJointState(self.quadruped,self.jointNameToId['motor_back_rightL_joint'],-1.57)
p.resetJointState(self.quadruped,self.jointNameToId['knee_back_rightL_link'],2.2)
p.createConstraint(self.quadruped,self.jointNameToId['knee_back_rightR_link'],self.quadruped,self.jointNameToId['knee_back_rightL_link'],p.JOINT_POINT2POINT,[0,0,0],[0,0.01,0.2],[0,-0.015,0.2])
self.setMotorAngleByName('motor_back_rightR_joint', 1.57)
self.setMotorAngleByName('motor_back_rightL_joint',-1.57)
p.resetJointState(self.quadruped,self.jointNameToId['motor_front_leftL_joint'],self.motorDir[0]*halfpi)
p.resetJointState(self.quadruped,self.jointNameToId['knee_front_leftL_link'],self.motorDir[0]*kneeangle)
p.resetJointState(self.quadruped,self.jointNameToId['motor_front_leftR_joint'],self.motorDir[1]*halfpi)
p.resetJointState(self.quadruped,self.jointNameToId['knee_front_leftR_link'],self.motorDir[1]*kneeangle)
p.createConstraint(self.quadruped,self.jointNameToId['knee_front_leftR_link'],self.quadruped,self.jointNameToId['knee_front_leftL_link'],p.JOINT_POINT2POINT,[0,0,0],[0,0.005,0.2],[0,0.01,0.2])
self.setMotorAngleByName('motor_front_leftL_joint', self.motorDir[0]*halfpi)
self.setMotorAngleByName('motor_front_leftR_joint', self.motorDir[1]*halfpi)
p.setJointMotorControl2(bodyIndex=self.quadruped,jointIndex=self.jointNameToId['knee_front_leftL_link'],controlMode=p.VELOCITY_CONTROL,targetVelocity=0,force=kneeFrictionForce)
p.setJointMotorControl2(bodyIndex=self.quadruped,jointIndex=self.jointNameToId['knee_front_leftR_link'],controlMode=p.VELOCITY_CONTROL,targetVelocity=0,force=kneeFrictionForce)
#left back leg
p.resetJointState(self.quadruped,self.jointNameToId['motor_back_leftR_joint'],1.57)
p.resetJointState(self.quadruped,self.jointNameToId['knee_back_leftR_link'],-2.2)
p.resetJointState(self.quadruped,self.jointNameToId['motor_back_leftL_joint'],-1.57)
p.resetJointState(self.quadruped,self.jointNameToId['knee_back_leftL_link'],2.2)
p.createConstraint(self.quadruped,self.jointNameToId['knee_back_leftR_link'],self.quadruped,self.jointNameToId['knee_back_leftL_link'],p.JOINT_POINT2POINT,[0,0,0],[0,-0.01,0.2],[0,0.015,0.2])
self.setMotorAngleByName('motor_back_leftR_joint', 1.57)
self.setMotorAngleByName('motor_back_leftL_joint',-1.57)
p.resetJointState(self.quadruped,self.jointNameToId['motor_back_leftL_joint'],self.motorDir[2]*halfpi)
p.resetJointState(self.quadruped,self.jointNameToId['knee_back_leftL_link'],self.motorDir[2]*kneeangle)
p.resetJointState(self.quadruped,self.jointNameToId['motor_back_leftR_joint'],self.motorDir[3]*halfpi)
p.resetJointState(self.quadruped,self.jointNameToId['knee_back_leftR_link'],self.motorDir[3]*kneeangle)
p.createConstraint(self.quadruped,self.jointNameToId['knee_back_leftR_link'],self.quadruped,self.jointNameToId['knee_back_leftL_link'],p.JOINT_POINT2POINT,[0,0,0],[0,0.005,0.2],[0,0.01,0.2])
self.setMotorAngleByName('motor_back_leftL_joint',self.motorDir[2]*halfpi)
self.setMotorAngleByName('motor_back_leftR_joint',self.motorDir[3]*halfpi)
p.setJointMotorControl2(bodyIndex=self.quadruped,jointIndex=self.jointNameToId['knee_back_leftL_link'],controlMode=p.VELOCITY_CONTROL,targetVelocity=0,force=kneeFrictionForce)
p.setJointMotorControl2(bodyIndex=self.quadruped,jointIndex=self.jointNameToId['knee_back_leftR_link'],controlMode=p.VELOCITY_CONTROL,targetVelocity=0,force=kneeFrictionForce)
#right front leg
p.resetJointState(self.quadruped,self.jointNameToId['motor_front_rightL_joint'],self.motorDir[4]*halfpi)
p.resetJointState(self.quadruped,self.jointNameToId['knee_front_rightL_link'],self.motorDir[4]*kneeangle)
p.resetJointState(self.quadruped,self.jointNameToId['motor_front_rightR_joint'],self.motorDir[5]*halfpi)
p.resetJointState(self.quadruped,self.jointNameToId['knee_front_rightR_link'],self.motorDir[5]*kneeangle)
p.createConstraint(self.quadruped,self.jointNameToId['knee_front_rightR_link'],self.quadruped,self.jointNameToId['knee_front_rightL_link'],p.JOINT_POINT2POINT,[0,0,0],[0,0.005,0.2],[0,0.01,0.2])
self.setMotorAngleByName('motor_front_rightL_joint',self.motorDir[4]*halfpi)
self.setMotorAngleByName('motor_front_rightR_joint',self.motorDir[5]*halfpi)
p.setJointMotorControl2(bodyIndex=self.quadruped,jointIndex=self.jointNameToId['knee_front_rightL_link'],controlMode=p.VELOCITY_CONTROL,targetVelocity=0,force=kneeFrictionForce)
p.setJointMotorControl2(bodyIndex=self.quadruped,jointIndex=self.jointNameToId['knee_front_rightR_link'],controlMode=p.VELOCITY_CONTROL,targetVelocity=0,force=kneeFrictionForce)
#right back leg
p.resetJointState(self.quadruped,self.jointNameToId['motor_back_rightL_joint'],self.motorDir[6]*halfpi)
p.resetJointState(self.quadruped,self.jointNameToId['knee_back_rightL_link'],self.motorDir[6]*kneeangle)
p.resetJointState(self.quadruped,self.jointNameToId['motor_back_rightR_joint'],self.motorDir[7]*halfpi)
p.resetJointState(self.quadruped,self.jointNameToId['knee_back_rightR_link'],self.motorDir[7]*kneeangle)
p.createConstraint(self.quadruped,self.jointNameToId['knee_back_rightR_link'],self.quadruped,self.jointNameToId['knee_back_rightL_link'],p.JOINT_POINT2POINT,[0,0,0],[0,0.005,0.2],[0,0.01,0.2])
self.setMotorAngleByName('motor_back_rightL_joint',self.motorDir[6]*halfpi)
self.setMotorAngleByName('motor_back_rightR_joint',self.motorDir[7]*halfpi)
p.setJointMotorControl2(bodyIndex=self.quadruped,jointIndex=self.jointNameToId['knee_back_rightL_link'],controlMode=p.VELOCITY_CONTROL,targetVelocity=0,force=kneeFrictionForce)
p.setJointMotorControl2(bodyIndex=self.quadruped,jointIndex=self.jointNameToId['knee_back_rightR_link'],controlMode=p.VELOCITY_CONTROL,targetVelocity=0,force=kneeFrictionForce)
def getBasePosition(self):
position, orientation = p.getBasePositionAndOrientation(self.quadruped)