Search found 21 matches

by ljb
Thu May 07, 2015 2:14 am
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: PGS method can't work?I need help!
Replies: 0
Views: 2496

PGS method can't work?I need help!

I'm using PGS to solve collide response.I ran into a problem.PGS can't approache to the solver.It divergence. My matrix A = J*M^(-1)*J^(T),The matrix A is SPD Matrix( Symmetric Positive Definite),and PGS methods is convergence.My matrix A is SPD,convergence is poor(Non diagonally dominant).Is there ...
by ljb
Mon Mar 02, 2015 8:44 am
Forum: General Bullet Physics Support and Feedback
Topic: Who can give me some information about PGS.
Replies: 10
Views: 4202

Re: Who can give me some information about PGS.

Thank a lot,I'll try it.
I have finished code on Projected Jacobi.
by ljb
Sun Feb 22, 2015 10:22 am
Forum: General Bullet Physics Support and Feedback
Topic: Who can give me some information about PGS.
Replies: 10
Views: 4202

Re: Who can give me some information about PGS.

1)Thanks a lot. :lol: :lol:
2)Anthor question:I find PGS in btSolveProjectedGaussSeidel.h.I can't trace code there! What should I do? :( :( :(
by ljb
Thu Feb 19, 2015 2:07 pm
Forum: General Bullet Physics Support and Feedback
Topic: Who can give me some information about PGS.
Replies: 10
Views: 4202

Re: Who can give me some information about PGS.

I build the demo,but I can not feel any speedup. wrong?
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by ljb
Thu Feb 19, 2015 1:06 pm
Forum: General Bullet Physics Support and Feedback
Topic: Who can give me some information about PGS.
Replies: 10
Views: 4202

Re: Who can give me some information about PGS.

thx,That is a greate information.I'm trying to study it.
:D :D :D :D :D
by ljb
Tue Feb 17, 2015 8:52 am
Forum: General Bullet Physics Support and Feedback
Topic: Who can give me some information about PGS.
Replies: 10
Views: 4202

Re: Who can give me some information about PGS.

I'm transplant collision code on CPU to GPU.So I had to understand it.
by ljb
Sun Feb 08, 2015 2:28 am
Forum: General Bullet Physics Support and Feedback
Topic: Who can give me some information about PGS.
Replies: 10
Views: 4202

Re: Who can give me some information about PGS.

I got it.setupContactConstraint() and solveGroupCacheFriendlySetup() do it.But I can not understand what function can do.Anybody can give me some information?
:( :( :( :(
by ljb
Sun Feb 08, 2015 12:22 am
Forum: General Bullet Physics Support and Feedback
Topic: Who can give me some information about PGS.
Replies: 10
Views: 4202

Who can give me some information about PGS.

I am a greenhand.My English is poor.I hope somebody can understand what I mean
The function resolveSingleConstraintRowLowerLimit()(at btSequentialImpluseConstraintSolver.cpp) is PGS,But where can I find that member variable m_rhs is setted.
:( :( :( :(
by ljb
Thu Feb 05, 2015 5:45 am
Forum: General Bullet Physics Support and Feedback
Topic: Who can give some information about variables as....
Replies: 2
Views: 1631

Re: Who can give some information about variables as....

THX,I try to understand and test.
:) :) :) :) :) :) :)
Somebody can understand me!
by ljb
Tue Feb 03, 2015 3:54 pm
Forum: General Bullet Physics Support and Feedback
Topic: Who can give some information about variables as....
Replies: 2
Views: 1631

Who can give some information about variables as....

I am a greenhand.My English is poor.I hope anyone can understand what I mean.
What does this variables mean inbtSolverConstraint.h file?There is no explanation.I cannot find any information.
m_rhs、m_cfm、m_relpos1CrossNormal、internalGetDeltaAngularVelocity、m_jacDiagABInv

:(
by ljb
Sun Jan 25, 2015 3:10 am
Forum: General Bullet Physics Support and Feedback
Topic: Question in Bullet source code.
Replies: 3
Views: 1805

Re: Question in Bullet source code.

I can't undetstand function dLineClosestApproach() in btBoxboxdetector.cpp.There is not explain.Who can help me!
by ljb
Sun Jan 25, 2015 2:46 am
Forum: General Bullet Physics Support and Feedback
Topic: Question in Bullet source code.
Replies: 3
Views: 1805

Re: Question in Bullet source code.

I got vertex face contact.But edge-edge contact is diffult.I 'm think why we don't use quadratic programming(David Eberly use it)to get distance between two rigid box.
by ljb
Wed Jan 21, 2015 2:16 pm
Forum: General Bullet Physics Support and Feedback
Topic: Question in Bullet source code.
Replies: 3
Views: 1805

Question in Bullet source code.

I'm reading Bullet source code.The function dBoxBox2() is complicated to me,who can explain it to me!How to get peneration depth,contact point?
The Function dBoxBox2() is in btBoxBoxDetector.cpp
:?:
by ljb
Tue Dec 23, 2014 2:48 am
Forum: General Bullet Physics Support and Feedback
Topic: How can I build examples in bullet master3?
Replies: 0
Views: 1891

How can I build examples in bullet master3?

There are a few GPU examples in Bullet master3,I can find project file,how can build them?. :? I use visual studio2012.

:? :? :? :? :?

vs2010_bullet2gpu.bat run error!
by ljb
Wed Nov 19, 2014 6:05 am
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: I need help for CollisionResponse
Replies: 0
Views: 2143

I need help for CollisionResponse

:? My english is poor,My question :How many methods is there in DoCollisionResponse()[Position Based or Velocity Based or something else] In RigidBody dynamics,we can use quadratic programming to get the nerest point in rigidbody and quadratic programming equal in value to LCP. I get this point and ...