Search found 83 matches
- Wed Sep 30, 2020 12:05 pm
- Forum: PyBullet Support and Feedback
- Topic: Some joint torques from getJointState(s) always zeros in pybullet
- Replies: 1
- Views: 7026
Re: Some joint torques from getJointState(s) always zeros in pybullet
please apply this patch as below and also remove the flag of p.URDF_USE_SELF_COLLISION to avoid too large torque. hope this can help you. diff --git a/examples/SharedMemory/PhysicsServerCommandProcessor.cpp b/examples/SharedMemory/PhysicsServerCommandProcessor.cpp index ac67d51a5..6e060bf54 100644 -...
- Wed Sep 16, 2020 1:41 am
- Forum: Career Opportunities
- Topic: Looking for a job.
- Replies: 0
- Views: 52070
Looking for a job.
hi Erwincoumans, I'm very interested in your great project, and have studied this for many years and often to join the issue discussion, submit some PRs as well. Recently i am trying to find a new job about this and find most users about this are students, Could you give me some advice which compani...
- Sun Jul 05, 2020 7:07 am
- Forum: PyBullet Support and Feedback
- Topic: setJointMotorControl2 won't assign correct force value to certain joints
- Replies: 5
- Views: 14130
Re: setJointMotorControl2 won't assign correct force value to certain joints
thanks for you reply.
this issue is caused by that the mass of the lower legs are too small, so far i don't know how to fix this. i just increase the mass to workaound this.
this issue is caused by that the mass of the lower legs are too small, so far i don't know how to fix this. i just increase the mass to workaound this.
- Sun Jul 05, 2020 3:20 am
- Forum: PyBullet Support and Feedback
- Topic: Regarding inaccurate movement by UR5 robot in simulation
- Replies: 1
- Views: 5336
Re: Regarding inaccurate movement by UR5 robot in simulation
Could you provide a simple test? thanks.
- Sun Jul 05, 2020 3:18 am
- Forum: PyBullet Support and Feedback
- Topic: setJointMotorControl2 won't assign correct force value to certain joints
- Replies: 5
- Views: 14130
Re: setJointMotorControl2 won't assign correct force value to certain joints
Can't reproduce your issue? Could you provide all the files? thanks.
cannot find 'MQ_SIM_ASEM/meshes/Chassis.STL' in any directory in urdf path
cannot find 'MQ_SIM_ASEM/meshes/Chassis.STL' in any directory in urdf path
- Sat May 09, 2020 1:26 am
- Forum: PyBullet Support and Feedback
- Topic: calculateMassMatrix inconsistent with RBDL
- Replies: 6
- Views: 11656
Re: calculateMassMatrix inconsistent with RBDL
http://www.doc88.com/p-9833547094235.html
not sure if you can access this link, also wanted to attach the pdf for your reference but it is too large about 32M for this web. i can email to you if you need.
not sure if you can access this link, also wanted to attach the pdf for your reference but it is too large about 32M for this web. i can email to you if you need.
- Fri May 08, 2020 11:10 am
- Forum: PyBullet Support and Feedback
- Topic: calculateMassMatrix inconsistent with RBDL
- Replies: 6
- Views: 11656
Re: calculateMassMatrix inconsistent with RBDL
adding this 'flags=pb.URDF_USE_INERTIA_FROM_FILE' when loading the urdf can fix this.
- Thu May 07, 2020 1:59 pm
- Forum: PyBullet Support and Feedback
- Topic: calculateMassMatrix inconsistent with RBDL
- Replies: 6
- Views: 11656
Re: calculateMassMatrix inconsistent with RBDL
thanks for your reply, i have found the orignal paper for bullet and i will check it and try to find the cause.
- Thu Apr 30, 2020 3:36 am
- Forum: PyBullet Support and Feedback
- Topic: bot gets unstable and blows away after some time
- Replies: 4
- Views: 10975
Re: bot gets unstable and blows away after some time
i find the velocity will oscillate and the amplitude will get bigger and bigger. i think it should be the issue of the PD parameters.
adding a velocity boundary of [-10,10] can fix this. just for your reference.
adding a velocity boundary of [-10,10] can fix this. just for your reference.
- Wed Apr 29, 2020 1:54 am
- Forum: PyBullet Support and Feedback
- Topic: calculateMassMatrix inconsistent with RBDL
- Replies: 6
- Views: 11656
Re: calculateMassMatrix inconsistent with RBDL
Do you have any progress? Could you tell me why did you compare the MassMatrix between them? thanks.
- Tue Nov 26, 2019 12:52 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Collision detection failed for Ellipsoid shapes
- Replies: 7
- Views: 14820
Re: Collision detection failed for Ellipsoid shapes
temp = (*pos) + m_localScaling * (vec * m_localScaling).normlized() * (*rad) - vec * getMargin(); feel it should be like this: temp = (*pos) + m_localScaling * (vec / m_localScaling).normalized() * (*rad) - vec * getMargin(); i will check if the points on the ellipsoid can be expressed by this func...
- Mon Nov 25, 2019 2:38 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Collision detection failed for Ellipsoid shapes
- Replies: 7
- Views: 14820
Re: Collision detection failed for Ellipsoid shapes
adding this shape->setMargin(0) can avoid this issue but i still can't understand what caused this issue. i have some questions when review this code below in line 76 of btMultiSphereShape.cpp. temp = (*pos) * m_localScaling + vec * m_localScaling * (*rad) - vec * getMargin(); 1. why the origin pos ...
- Thu Nov 14, 2019 7:14 am
- Forum: General Bullet Physics Support and Feedback
- Topic: What parameters to tune to stabilize collisions
- Replies: 8
- Views: 12301
Re: What parameters to tune to stabilize collisions
hi JJJK,
i still suspect that this is caused by the non-suitable actions. i find the every joint of the human description with URDF format doesn't have any limitation while in the MJCF format it does.
hope you can update your latest demo.
thanks.
i still suspect that this is caused by the non-suitable actions. i find the every joint of the human description with URDF format doesn't have any limitation while in the MJCF format it does.
hope you can update your latest demo.
thanks.
- Tue Nov 12, 2019 7:53 am
- Forum: General Bullet Physics Support and Feedback
- Topic: What parameters to tune to stabilize collisions
- Replies: 8
- Views: 12301
Re: What parameters to tune to stabilize collisions
hi all,
i have another question not specific to this case, where does the motor constraint force come from? this force will increase the system energy? thanks.
i have another question not specific to this case, where does the motor constraint force come from? this force will increase the system energy? thanks.
- Tue Nov 12, 2019 12:55 am
- Forum: General Bullet Physics Support and Feedback
- Topic: What parameters to tune to stabilize collisions
- Replies: 8
- Views: 12301
Re: What parameters to tune to stabilize collisions
did you only change the robot description to the pybullet_data/mjcf/humanoid.xml then it can work now? did you have any other changes? could you also attach them also? thanks.