Abacus Physics problem

Hi,

I am making an abacus in my project and I am doing my physics settings on ball for abacus in attached image BallInspector.png.

Balls Image

https://dl.dropboxusercontent.com/u/6355240/Abacus.png

Ball Inspector Settings

https://dl.dropboxusercontent.com/u/6355240/BallInspector.png

I am only allowing object to move in x direction only, and I am moving my balls like this

Code (csharp):

1.  
2. Vector3 vect = GUICamera.ScreenToWorldPoint(new Vector3(drag.position.x, Screen.height*0.1f, 1.7f));
3. currDraggObject.rigidbody.position = vect;
4.  

I am not moving it using transform.position.

It works some times fine.. but some times balls get into each other.... any thing I am doing wrong?

thanks

chishti

 

In the same way I have 2 square in my project


and their physics settings in inspector are


and I am moving them using statement

currDragObject.rigidbody.MovePosition(Camera.main.ScreenToWorldPoint (new Vector3 (drag.position.x, drag.position.y, 1.8f)));

They collide fine. but some times they get into each other... the collision is not smooth.

thanks
chishti

 

any one?
what's the best way to setup an abacus with colliders?