Real-Time Physics Simulation Forum

Android usually runs on ARM and does ARM has FPU ? May be some phones has FPU co-processor.

Thank You! it is basically what I did http://www.bulletphysics.org/mediawiki-1.5.8/index.php?title=Collision_Callbacks_and_Triggers#Contact_Callbacks As I understand that these callbacks might be called many times for 1 hit. So I can start playing many sounds concurrently and how to detect volume (e...

When bodies bounce in game some audio effect must be played and visual effects like sparks must be generated. What is the best way to do that? I have defined and registered bool myContactAddedCallback(btManifoldPoint& cp, const btCollisionObject* colObj0,int partId0,int index0,const btCollisionO...

Thanks.

My project worked slow and I decided to look how will it work in optimized mode. I expected to see it working faster or at same speed. But I it looks like physics is completely corrupted. e.g. btActionInterface::updateAction is not called or some ray/convex test are not detecting collisions. In othe...

Bullet 2.76 btCompoundCollisionAlgorithm.cpp btCompoundCollisionAlgorithm::calculateTimeO btScalar frac = m_childCollisionAlgorithms[i]->calculateTimeOfImpact(colObj,otherObj,dispatchInfo,resultOut); if (frac<hitFraction) { hitFraction = frac; } m_childCollisionAlgorithms was null so I replaced that...

What is a status of btContinuousDynamicsWorld?

Looks like it does what I want but it has some different "bugs" also.

I have not proceed far with code. SIMD code is harder to understand and I turned it off. But now I found that SIMD code works reliably/stable or at least differently. Is that possible? Does SIMD use different algorithm? ----- Back to previous my question with picture. It looks like I have to adjust ...

Could someone tell me how to find contact point of convex or triangle mesh? Like I showed in previous post. Thanks

I made a following sketch http://img339.imageshack.us/img339/3209/bulletphysics.th.jpg I wish to detect point where rigitBody (e.g. convex) touches static body. I make call collisionWorld->convexSweepTest() and I have defined my convexResultCallback. But collisionWorld returns contact point like on ...

Thank You! You helped me a lot!

Looks like I have to define m_normalWorldOnB for certain collisions. Right now it is defined by Gjk and I have to define custom class that will use Gjk and override normals for certain pairs of objects.

Could someone point me at code which resolves collisions after they are detected by applying force or impulses or translating bodies?

Thanks. Yes. I can debug the code and I set break point and it was calling and applying the impulses I looked to be the place because it is applying impulse directed by contact normal. There are other similar calls but they reside in methods like "resolveSingleConstraintRowGeneric" I guess...

I have remmed these lines but it still work as before with no difference. //if (rb0) // m_tmpSolverBodyPool[solverConstraint.m_solverBodyIdA].applyImpulse(solverConstraint.m_contactNormal*rb0->getInvMass(),solverConstraint.m_angularComponentA,solverConstraint.m_appliedImpulse); //if (rb1) // m_tmpSo...

I am learning void btSequentialImpulseConstraintSolver::convertContact(btPersistentManifold* manifold,const btContactSolverInfo& infoGlobal) Is that method resolves collisionsby applying following impulses? ///warm starting (or zero if disabled) if (infoGlobal.m_solverMode & SOLVER_USE_WARMS...