Limit Rigidbody Velocity

Questions & Answers
1

So, I'm making a game which the player controls a ball down a hill. I made it so it adds a bit of speed every few frames but what I want is when the player reaches a certain velocity their speed will be limited. How would I do this?

2

Something along these lines should do it

var maxVelocity : float = 10.0; //set in the inspector

function Update()
{
    var velocity = rigidbody.velocity;
    if (velocity == Vector3.zero) return;

    var magnitude = velocity.magnitude;
    if (magnitude > maxVelocity)
    {
        velocity *= (maxVelocity / magnitude);
        rigidbody.velocity = velocity;
    }
}
3

For rigidbpdy, I use FixedUpdate http://unity3d.com/support/documentation/ScriptReference/MonoBehaviour.FixedUpdate.html

var velocityMax : float;    //say 10 @ the inspector
var speedRate: float;       //say 2 @ the inspector
function FixedUpdate()
{
    var vMotion = Input.GetAxis ("Vertical") * speedRate;
    var velocity = rigidbody.velocity;
    var vMagnitude = velocity.magnitude;
    if(vMagnitude < velocityMax)
    {
    rigidbody.velocity += vMotion;
    }
}

In this case, more velocity will be added only if the velocity is less than the limit (velocityMax)

4

maybe you could increase the drag property on inclined downward slopes.. it is not the best solution but it worked for me.

5

See this question: http://answers.unity3d.com/questions/2502/limiting-rigidbody-velocity