Search found 7 matches

by hotgarlic
Tue Feb 13, 2018 11:43 am
Forum: PyBullet Support and Feedback
Topic: velocity depend on time step?
Replies: 0
Views: 366

velocity depend on time step?

I change the time step by code: p.setTimeStep(time_step)
Then call p.stepSimulation() in loop code.

I got the velocity of a joint, the value is vary to the different time step setting.
The difference of peak velocity is large.

What is the problem? My choice of time step is not property?
by hotgarlic
Thu Dec 14, 2017 11:53 am
Forum: PyBullet Support and Feedback
Topic: sw2urdf export x.urdf can not be loaded to pybullet
Replies: 2
Views: 285

Re: sw2urdf export x.urdf can not be loaded to pybullet

Thanks!

I got the model I want follow your advise.
by hotgarlic
Thu Dec 14, 2017 6:43 am
Forum: PyBullet Support and Feedback
Topic: sw2urdf export x.urdf can not be loaded to pybullet
Replies: 2
Views: 285

sw2urdf export x.urdf can not be loaded to pybullet

As my discription, I transfer an assembly in solidworks by sw2urdf plugin tool.
Copy the x.urdf to directory fo pybullet physical sever.
Run loadURDF code, the error printed"Can not load"

I dont know what step is wrong.
by hotgarlic
Wed Dec 13, 2017 4:03 am
Forum: PyBullet Support and Feedback
Topic: how to change joint position
Replies: 2
Views: 376

Re: how to change joint position

Thanks! I have read the example code by code. But I can not find out the code which define the location of joint. The location of joint is always on the center of mass despite I change some arguments. In the createMultiBodyLinks.py, the only codes about joint I could find as follows. 26 jointTypes=[...
by hotgarlic
Tue Dec 12, 2017 8:07 am
Forum: PyBullet Support and Feedback
Topic: how to change joint position
Replies: 2
Views: 376

how to change joint position

There are two ways to create(or set) joint between links. Declare it when create multibody and create constrain. As my understanding of the guide manual. But it is strange. I can not change the position of revolute joint in createMultiBody command. Is there some API to change the position? Also, cre...
by hotgarlic
Tue Dec 12, 2017 7:53 am
Forum: PyBullet Support and Feedback
Topic: some concepts
Replies: 2
Views: 324

Re: some concepts

Thanks for your reply @Erwin Coumans
Your explanation is good for me, for I am not clear after reading the guide of pybullet until your reply.
by hotgarlic
Sun Dec 10, 2017 3:56 pm
Forum: PyBullet Support and Feedback
Topic: some concepts
Replies: 2
Views: 324

some concepts

what is the difference between link and body?
indice and index?
What is the meaning for frame?
On pybullet contex, many concepts may be different to other engine, I am confused.