stop sliding down slopes - WITH IMAGE

Unity Engine
1

934659--35047--$Screen shot 2012-05-26 at 00.28.13.png

rigidbody on a slope and i want the player to contol its movement up and down a slope so i dont want it to be able to slide. Im using the velocity to move the player so i cant constraint axis.

Also, when it slides down it jitters down, and i think its becoz of this code. Im using this code to angle the player in relation to the slope

        #pragma strict
    
    function OnCollisionEnter(col:Collision)
    {
    	if(col.collider || col.rigidbody)
    	{
    		transform.rotation = col.transform.rotation;
    	}
    }
    
    function OnCollisionStay(col:Collision)
    {
    	if(col.collider || col.rigidbody)
    	{
    		transform.rotation = col.transform.rotation;
    		
    	}
    }
    
    function OnCollisionExit(col:Collision)
    {
    	if(col.collider || col.rigidbody)
    	{
    		transform.rotation = Quaternion.Euler(0,0,0);
    	}
    }
2

what I have in mind right now for the solution is constraint. Constraint the y position when player is not moving. unConstraint it when player is moving or when you have something drop on the object which is below the player.

3

no that wont work very efficiently