Search found 7 matches

by daye
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: 166

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...
by daye
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: 166

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...
by daye
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: 166

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...
by daye
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: 500

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
by 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: 943

Re: Is there a lower limit for velocity in Bullet?

Thank you very much! It really helps me! :lol: :lol: :lol:
by daye
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: 943

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...
by daye
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: 585

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...