Randomly changing rotation over time

Scripting
1

I’m looking for a way to randomly change the rotation of an object, but slowly over time. I’m trying to create a wander behavior for my game’s ai, and use this for the direction of travel. Any suggestions?

2 
public var elapsed : float = 0.0;
public var orig : Vector3;
public var dir : float = 0.0;
public var dur: float = 0.0 ;
public var target_rotation : Vector3;
 
function PickNewRandomDir(){
  orig = transform.eulerAngles;
  //pick a direction
  dir = Rand.Range(0.0, 360.0);
  //pick a duration in seconds
  dur = Rand.Range(0.0, 2.0);
  target_rotation = new Vector3( orig.x, orig.y, dir); //where z is the  randomized direction

}

function Start(){
  PickNewRandomDir();
}

function Update(){
  if(elapsed > dur){
    elapsed = 0.0;  
  }
  transform.eulerAngles = Vector3.Lerp(orig, target_rotation, dur/elapsed);
  elapsed = elapsed + Time.deltaTime;
}

something like that should do what you wanted (untested code!),

the effect will be that you will be traveling in arcs of random size.

[/code]

3

Thanks for pointing me in the right direction. I adjusted your code slightly, this seems to work.

public var elapsed : float = 0.0; 
public var orig : Vector3; 
public var dir : float = 0.0; 
public var dur: float = 0.0 ; 
public var target_rotation : Vector3; 
  
function PickNewRandomDir(){  
  //pick a direction 
  dir = Random.Range(0.0, 360.0); 
  //pick a duration in seconds 
  dur = Random.Range(0.0, 2.0); 
  target_rotation = new Vector3( orig.x, dir, orig.z); //where y is the  randomized direction 

} 

function Start(){ 
 // PickNewRandomDir(); 
} 

function Update(){ 
  if(elapsed > dur){ 
  	PickNewRandomDir();
    elapsed = 0.0;  
  } 
  orig = transform.eulerAngles;
  transform.eulerAngles = Vector3.Lerp(orig, target_rotation,  Time.deltaTime * 1);
  elapsed = elapsed + Time.deltaTime; 
  
}

If I’m lerping between 2 eularAngles in 3 axes am I going to have gimbal issues? Any way to do something similar with quaternions?

Edit: Yeah, it works great in one axis, but not more than 1. I guess I could make a separate script for each axis and apply them to a hierarchy of game objects, but that seems kinda messy and bad for performance since there would be 3 lerps.