Search found 83 matches
- Mon May 27, 2019 12:21 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: Incorrect results when simulating multiple bodies
- Replies: 8
- Views: 6056
Re: Incorrect results when simulating multiple bodies
Could you tell me the initial postion of these two meshes, as well as some parameters, such as the initial velocity, friction, mass or other values? thanks.
- Mon May 27, 2019 11:19 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Incorrect results when simulating multiple bodies
- Replies: 8
- Views: 6056
Re: Incorrect results when simulating multiple bodies
Could you attach your stl files and code snippet of how did you create your world? i want to reproduce it and then debug it to find the root cause.
thanks!
thanks!
- Sun May 26, 2019 2:12 pm
- Forum: PyBullet Support and Feedback
- Topic: Issues with velocity control
- Replies: 5
- Views: 9495
Re: Issues with velocity control
update the procedure of this case. 1. apply the gravity to the multibody then will change the velocity, 2. apply the constraints, including 1> jointMotor constraint that will try to change the velocity back to the targetVelocity, 0 for your case; 2> Fixed constraint 3> contact constraint and frictio...
- Fri May 24, 2019 9:19 am
- Forum: PyBullet Support and Feedback
- Topic: Issues with velocity control
- Replies: 5
- Views: 9495
Re: Issues with velocity control
download the meshes from https://github.com/ros-industrial/unive ... ion/meshes.
- Thu May 23, 2019 6:36 pm
- Forum: PyBullet Support and Feedback
- Topic: Issues with velocity control
- Replies: 5
- Views: 9495
Re: Issues with velocity control
Could you also attach all the mesh files? thanks.
Code: Select all
b3Printf: ur5_free_base.urdf:24: cannot find 'meshes/ur5/visual/base.dae' in any directory in urdf path
- Thu May 23, 2019 7:21 am
- Forum: PyBullet Support and Feedback
- Topic: Issues with velocity control
- Replies: 5
- Views: 9495
Re: Issues with velocity control
Could you attach a complete simple test? i can debug it with you to find what happened there. so far my understanding about the procedure: 1. apply the gravity to the multibody then will change the velocity, 2. apply the jointMotor constraint that will change the velocity back to the targetVelocity,...
- Tue May 21, 2019 11:27 am
- Forum: General Bullet Physics Support and Feedback
- Topic: SoftBody: modeling a rope from trimesh
- Replies: 6
- Views: 7757
Re: SoftBody: modeling a rope from trimesh
i find that there are duplicated vertex in the array of gVerticesRope, the engine will create a node for each vertex when this array is passed to the btSoftBody(), so there will be more than one node for a same point that is not what we expect. i think you need to re-design your gVerticesRope/gIndic...
- Mon May 20, 2019 1:53 am
- Forum: General Bullet Physics Support and Feedback
- Topic: SoftBody: modeling a rope from trimesh
- Replies: 6
- Views: 7757
Re: SoftBody: modeling a rope from trimesh
Could you first change your mesh? i would like to work with you to find the root cause.
i also noted that the first and last note are not located at the end of this rope.
i also noted that the first and last note are not located at the end of this rope.
- Sun May 19, 2019 10:42 am
- Forum: PyBullet Support and Feedback
- Topic: Joint friction
- Replies: 5
- Views: 7212
Re: Joint friction
you can google the damping then you can know what the damping is used for. the damping force is a resistence that proportional to the velocity but in the opposite direction. as for the implementation in this engine, honestly so far i still don't understand what that equation below comes from. for mo...
- Fri May 17, 2019 9:12 am
- Forum: PyBullet Support and Feedback
- Topic: Joint friction
- Replies: 5
- Views: 7212
Re: Joint friction
1. p.setJointMotorControl2(obj,1,p.VELOCITY_CONTROL,targetVelocity=0,force=frictionForce)
2. p.changeDynamics(obj,j,linearDamping=value1, angularDamping=value2)
for my understanding, these two get the similar result with different methods. you can try it and see if get what you want.
2. p.changeDynamics(obj,j,linearDamping=value1, angularDamping=value2)
for my understanding, these two get the similar result with different methods. you can try it and see if get what you want.
- Fri May 17, 2019 1:45 am
- Forum: PyBullet Support and Feedback
- Topic: Joint friction
- Replies: 5
- Views: 7212
Re: Joint friction
self._p.setJointMotorControlArray(self.kuka_uid, self._motor_indices, self._p.VELOCITY_CONTROL, forces=np.zeros(len(self._motor_indices))) i think this is a method to simulate the joint friction, like the angularDamping. self._p.changeDynamics(self.kuka_uid, self._motor_indices, lateralFriction=fri...
- Thu May 16, 2019 12:20 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: SoftBody: modeling a rope from trimesh
- Replies: 6
- Views: 7757
Re: SoftBody: modeling a rope from trimesh
after removing the "psb->m_cfg.kMT = 0.5;" it will become the one like below which seems that your mesh is constructed of some separate parts.
- Thu May 16, 2019 8:24 am
- Forum: General Bullet Physics Support and Feedback
- Topic: RayTest randomly failing
- Replies: 5
- Views: 4309
Re: RayTest randomly failing
i also run it with very high fps with different parameters, but my hit point always is (-5.046927:1.000000:39.472855).
i compile it with double precision enabled, maybe this is the main difference between us.
good luck!
Code: Select all
while(1)
castRays();
good luck!
- Thu May 16, 2019 7:37 am
- Forum: General Bullet Physics Support and Feedback
- Topic: RayTest randomly failing
- Replies: 5
- Views: 4309
Re: RayTest randomly failing
i just do a test with your data, all the result is as expected. from(-5.087273,0.000000,39.472855) to(-5.025157,0.000000,39.472855) hasHit ..........-5.046927:1.000000:39.472855 from(-5.099017,0.000000,39.472855) to(-5.037612,0.000000,39.472855) hasHit ..........-5.046927:1.000000:39.472855 from(-5....
- Thu May 16, 2019 1:52 am
- Forum: General Bullet Physics Support and Feedback
- Topic: RayTest randomly failing
- Replies: 5
- Views: 4309
Re: RayTest randomly failing
Could you provide the positions of your rigidbody? i want to reproduce this issue and find the root cause with you. thanks.