角色控制附在物体表面运动根据表面法线方向

private var character :CharacterController;
private var speed =0.0;
private var trans:Transform;
private var targetRot:Quaternion;

 var rotationSpeed = 90 ;
 var pedalImpulse = 3.5;
 var maxSpeed = 12;
 var decayRate = 0.1;
 
function Start()
{
   character = GetComponent(CharacterController);
   trans= transform ;
}

function pedal()
{
    speed+= pedalImpulse;
 speed = Mathf.Min(speed , maxSpeed);
}

function Update ()
{
   var horizontal = Input.GetAxis("Horizontal");
   transform.Rotate(0,rotationSpeed*horizontal*Time.deltaTime,0);
  
   if(character.isGrounded && Input.GetKeyDown(KeyCode.Space))
   pedal();
  
   var moveDirection = trans.forward*speed;
   moveDirection += Physics.gravity;
   character.Move(moveDirection*Time.deltaTime);
  
   var ray = new Ray(trans.position+Vector3.up,-Vector3.up);
   var hit : RaycastHit;
   if (character.isGrounded && Physics.Raycast(ray,hit,10))
   {
       var targetRight = Vector3.Cross(hit.normal,trans.forward);
    var targetForward = Vector3.Cross(targetRight,hit.normal);
    targetRot = Quaternion.LookRotation(targetForward,hit.normal);
   }
  
   trans.rotation = Quaternion.Slerp(trans.rotation,targetRot,5*Time.deltaTime);
  
   if(character.isGrounded)
   {
      if(speed<0.3)
   speed=0;
   else
   {
      speed -= decayRate*Time.deltaTime*speed;
   }
     
   }
}