Search found 8 matches

by Otz
Wed Sep 05, 2012 11:48 am
Forum: General Bullet Physics Support and Feedback
Topic: Stiffness of btGeneric6DofConstraint
Replies: 2
Views: 3796

Stiffness of btGeneric6DofConstraint

Hi there, I am working on a humanoid robot physics simulator and I use btGeneric6DofConstraints for all the joints of the robot. Please look at this little screen capture: http://www.youtube.com/watch?v=6ggX2nnU-CQ Here you can see my problem with the constraints. They aren't stiff. Can somebody hel...
by Otz
Thu Aug 09, 2012 10:28 am
Forum: General Bullet Physics Support and Feedback
Topic: small objects and too early collisions
Replies: 1
Views: 1069

Re: small objects and too early collisions

maybe I can answer the question by myself now :)

I found a function of the collision shape to set the collision margin with setMargin(double). Regularly, it's on 0.04 (4 cm).

Correct me, if I am wrong!
by Otz
Thu Aug 09, 2012 10:03 am
Forum: General Bullet Physics Support and Feedback
Topic: small objects and too early collisions
Replies: 1
Views: 1069

small objects and too early collisions

hey there, I have a problem of the collisions of 2 small objects. the sizes are 0.05 and 0.01 units and the collision is too early, i think. the objects don't collide each other. it seems like they are magnetic or something. is it possible that the collision is not perfect for small objects? I tried...
by Otz
Thu Aug 09, 2012 9:43 am
Forum: General Bullet Physics Support and Feedback
Topic: constraints aren't stiff
Replies: 4
Views: 2503

Re: constraints aren't stiff

thank you for the tipps!!
by Otz
Tue Jul 17, 2012 7:20 am
Forum: General Bullet Physics Support and Feedback
Topic: constraints aren't stiff
Replies: 4
Views: 2503

Re: constraints aren't stiff

Hey, i have fixed some stupid bugs in my simulator, but the constraints still aren't stiff. Here a little video: http://www.youtube.com/watch?v=R6KRtTQf874 my parameters: linStopERP 0.4 linStopCFM 0.0000 linCFM 0.0000 angStopERP 0.4 angStopCFM 0.0000 angCFM 0.0000 Can somebody help me with this prob...
by Otz
Mon Jul 02, 2012 11:05 am
Forum: General Bullet Physics Support and Feedback
Topic: Friction parameters of rigid bodies
Replies: 1
Views: 1321

Friction parameters of rigid bodies

I have a next problem with the friction. Here you can see an example video : http://www.youtube.com/watch?v=WEBTTwy-8aU The robot tries to walk, fall down, and then he tries to stand up. The friction of the bottom is 1 (body->setFriction(1)) and the friction of all robot parts is 0.9f . Why he has n...
by Otz
Mon Jul 02, 2012 10:10 am
Forum: General Bullet Physics Support and Feedback
Topic: btConeTwistConstraint A & B params
Replies: 2
Views: 1149

Re: btConeTwistConstraint A & B params

one transform for the pivot point of body A, and one for the pivot point of body b.
by Otz
Wed Jun 27, 2012 9:33 am
Forum: General Bullet Physics Support and Feedback
Topic: constraints aren't stiff
Replies: 4
Views: 2503

constraints aren't stiff

Hi, at the moment I develop a simulation for a humanoid robot, but i have a problem with the constraints. I use the btGeneric6DofConstraint for all joints of my robot an set angular and linear Limits 0. I set the CFM- and ERP-parameter with follow values: linearStopERP = 0.6 linearStopCFM = 0.9 line...