How to use quaternion.lerp

Archived Forums Questions & Answers
1

I came across this:

var from : Transform;
var to : Transform;
var speed = 0.1;
function Update () {
	transform.rotation =
	  Quaternion.Lerp (from.rotation, to.rotation, Time.time * speed);
}

But I’m to stupid to figure it out. I’m trying to smoothly rotate an object a certain amount, but do I replace where it says Transform with an angle like 10,0,0?

If you are doing a relative movement, Use [Transform.Rotate()][1] instead. There are lots of ways of setting up a movement over time using a Quaternion. If you explain in detail how you plan to use this code, someone on this list can modify your code to make it work for that specific use. [1]: http://docs.unity3d.com/Documentation/ScriptReference/Transform.Rotate.html

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Why don't you check out the Unity Script Reference, and search for [Quaternion.Lerp][1]. [1]:http://docs.unity3d.com/Documentation/ScriptReference/Quaternion.Lerp.html

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2 Answers

2
2

from.rotation is the angle from where you want to start rotating the object, to.rotation the angle where the rotation stops, and the last elemente is the delta T of the rotation. I’m not sure but I think quatertion arguments must be in radians, not degress.

Quaternion arguments are in degrees.

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Nice, had that thing bugging me but never rembered to check it out

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3

You can use Quaternion.Euler() to construct a rotation for use in this code:

var from : Vector3;
var to : Vector3;
var speed = 0.1;
private var qFrom : Quaternion;
private var qTo : Quaternion;

function Start() {
   qFrom = Quaternion.Euler(from);
   qTo   = Quaternion.euler(to);
}

function Update () {
    transform.rotation =
      Quaternion.Lerp (qFrom, qTo, Time.time * speed);
}

Note this code is only going to work when the game is first run. The last parameter of the Lerp() is a value between 0 and 1, and that will only be true when the game first starts.