Physics engine recommendation which can simulate pool game correctly?

I'm making a pool-game like game. This game requires correct (or very accurate) reflective bounces. I tried Box2D and Bullet Physics, but they both have this problem.

If there is a wall on top of this image, red line is expected course of a real ball in a pool-game. But the engines often shows green line course. Especially,

1. This happens after a slowly moving ball hits the wall.


2. Sometimes a rapidly moving ball get slower suddenly.

I'm finding a physics engine which can simulate pool-game accurately as much as possible without these problems. Can I get some recommendations? Now I'm digging Newton Game Dynamics, but I am not sure the engine will show what I want. I'm considering the PhysX engine as a next trial, and have to make my own if nothing works. But it's obvious it'll take very long time, so I wish I won't do that. I'll be very appreciated if you save my time. And of course, solution with Box2D / Bullet Physics are also welcomed.

I am working with C/C++/Objective+C on iOS.

---

I attach my configuration with Box2D.

• static box shape


• linear/angular damping = 0.1


• restitution = 1.0


• friction = 100


• density = 10


• bullet = false


• fixed rotation = false


• inertial scale = 1.0

• dynamic sphere shape


• linear/angular damping = 0.1


• restitution = 1.0


• friction = 100


• density = 20


• bullet = true


• fixed rotation = false


• inertial scale = 1.0

Answer

Several solutions.

1. 
   

   For Box2D, set b2_velocityThreshold in b2Settings.h file. In my case, I set it to 0.0f and it worked! Mass, friction, damping were NOT problem. Check this discussion thread for more details. http://www.box2d.org/forum/viewtopic.php?f=3&t=6906&p=30782#p30782

   
   


2. 
   

   Using other physics engine. Newton Game Dynamics configured performing this correctly by default. However using Newton dynamics in iOS is possible but it's somewhat harder than others. I used several days configuring it for iOS.

   
   

I'm also asking on BulletPhysics forums. I'll update this when I got a solution.

-- (edit) --

There are some threshold attributes in Bullet, however I couldn't find exactly same thing with b2_velocityThreshold.

This looks similar, but didn't work well.

btRigidBody->setContactProcessingThreshold(0.0f)