Cube翻滚前进

方法一：给Cube添加rigidbody，然后代码rigidbody.AddTorque (10, 0, 0);将使Cube沿X轴翻滚

方法二：Cube没有 添加rigidbody，利用以下代码计算翻滚

// Reposting this non-working answer because it was unreadable when posted as a comment to the previous answer



var cubeSize : float = 1; 

var cubeSpeed : float = 80;



private var totalRotation : float = 0; // determines if we're past the 90 degrees

private var startHeight : float = 0; // for correcting height errors



// next two vars are for determining the corner

// to rotate over

private var fwdWeight : float = 0.5;

private var upWeight : float = -0.5; 





// Use this for initialization

function Start () {

    startHeight = transform.position.y;

}



// Update is called once per frame

function Update () {



    DoRoll(2);



}



function DoRoll (delay: float) {

    var spinAmount : float = Time.deltaTime * cubeSpeed;

    var t : float;

    var pos : Vector3;



    // we rotate around one of the edges of the cube (the stationary one of course)

    transform.RotateAround(transform.position + (fwdWeight * transform.forward + upWeight * transform.up) * cubeSize, Vector3.right, spinAmount);



    // add to amount of spin in this update the total rotation

    totalRotation += spinAmount;



    // check if we have to move to the next edge

    if (totalRotation >= 90) {

            // we move to next corner as pivot point

            totalRotation -= 90;

            t = fwdWeight;

            fwdWeight = -upWeight;

            upWeight = t;



            // make sure height stays correct

            pos = transform.position;

            pos.y = startHeight;

            transform.position = pos;

            print ("At rotation " + totalRotation);

            yield WaitForSeconds(delay);



    }

}