Search found 8 matches
- Thu Oct 31, 2019 6:56 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Complementarity problem and friction approximation in Bullet
- Replies: 1
- Views: 5901
Complementarity problem and friction approximation in Bullet
I am confused about what kind of complementarity problem that Bullet solved. I have read some thesis and posts in the forum. Someone stated that Bullet solved the MLCP for the contact, due to the frcition cone was simplified. But others said Bullet can solve the NCP directly with the PGS solver. I d...
- Thu Aug 15, 2019 9:38 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Problems occurred when the validation of the Bullet's accuracy with a bouncing ball test
- Replies: 5
- Views: 4699
Re: Problems occurred when the validation of the Bullet's accuracy with a bouncing ball test
I have tested your suggestion. But the simulated result is even worse. When the ball contacted with the floor, it rested on the floor. :shock: When I set the time step as world->stepSimuation(1/60.0, 1, 1/60.0) , the simulation gave the results as the figure in my first post. There is another questi...
- Tue Aug 13, 2019 6:30 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Problems occurred when the validation of the Bullet's accuracy with a bouncing ball test
- Replies: 5
- Views: 4699
Re: Problems occurred when the validation of the Bullet's accuracy with a bouncing ball test
Thank you for your reply! The simulation used the fixed substep and its duration is 1/600. The max substeps is 10. I am using double precision and the version is bullet3-2.87. In the simulation, the floor was set as btStaticPlaneShape. Here is part of my code: btTransform t; t.setIdentity(); t.setOr...
- Mon Aug 12, 2019 6:13 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Problems occurred when the validation of the Bullet's accuracy with a bouncing ball test
- Replies: 5
- Views: 4699
Problems occurred when the validation of the Bullet's accuracy with a bouncing ball test
Hello all, I want to validate the accuracy of Bullet. I simulated a bouncing ball contacting with a static plane only with the gravity. The ball's trajectory was recorded and compared with the analytic solution. But large errors occurred after a few collisions. I don't know what caused the discrepan...
- Sun Jan 06, 2019 1:31 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Is there SAT algorithm in Bullet Physics Engine
- Replies: 2
- Views: 4226
Is there SAT algorithm in Bullet Physics Engine
Hi everyone,
I want to change the Collision Detection algorithm to SAT algorithm. I only found GJK algorithm in Bullet. Is there SAT algorithm in Bullet Physics Engine which I can call it directly? Or I have to achieve that by myself?
Thank you in advance!
Daye
I want to change the Collision Detection algorithm to SAT algorithm. I only found GJK algorithm in Bullet. Is there SAT algorithm in Bullet Physics Engine which I can call it directly? Or I have to achieve that by myself?
Thank you in advance!
Daye
- Fri Jul 20, 2018 12:10 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Is there a lower limit for velocity in Bullet?
- Replies: 4
- Views: 8579
Re: Is there a lower limit for velocity in Bullet?
Thank you very much! It really helps me!
- Thu Jul 19, 2018 2:16 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: Is there a lower limit for velocity in Bullet?
- Replies: 4
- Views: 8579
Is there a lower limit for velocity in Bullet?
Hi all, I set the body in a constant velocity, with setLinearVelocity before stepSimulation. When the velocity is higher than 1 mps, it looks well. But when I set the velocity below 1 mps, such as 0.1 mps, the body stops unbelievably after a few time steps. I'm very confused about it. Is there a low...
- Wed Jul 11, 2018 2:44 am
- Forum: General Bullet Physics Support and Feedback
- Topic: How to get the friction force in Bullet?
- Replies: 0
- Views: 2823
How to get the friction force in Bullet?
I'm the beginner of Bullet. In my work, I want to get the friction force between the bodies' interaction. I noticed that m_appliedImpulseLateral1 and m_appliedImpulseLateral2 in btManifoldPoint Class maybe the friction impulse during the contact procress. So I calculated the friction force as follow...