# Quaternions and cube rotation.

 0 Hello,here I'm stuck with quaternion usage (I know I'm not alone and that's reassuring... a bit:)).I have a cube. I want to make this cube rotates from 90 degrees on X axis or Y axis in worldspace.Here is the code I use in the cube script : ``````void Update() { if (transform.rotation == _nextRot) { _currentRot = transform.rotation; if (_onX == false) { _nextRot = transform.rotation * Quaternion.Euler(transform.up * 90); _onX = true; } else { _nextRot = transform.rotation * Quaternion.Euler(transform.right * 90); _onX = false; } _turntime = Time.time; } transform.rotation = Quaternion.Slerp(_currentRot,_nextRot, (Time.time - _turntime) * 0.2f); } ``````As I understand it, using `transform.up` or `transform.right` and multiplies it by my rotation gives me a new rotation in worldspace. However this code gives me a cube rotating on X one time then only on Y axis.Any idea? more ▼ asked Jun 23 '12 at 10:00 AM lvictorino 654 ● 7 ● 17 ● 20 Victor ... did you check out the LOOKAT command in Unity? it solves many problems! check it out Jun 23 '12 at 08:20 PM Fattie add new comment (comments are locked) 10|3000 characters needed characters left ▼ Viewable by all users

1 answer: sort voted first
 0 You are over complicating it :) `````` _nextRot = Quaternion.Euler(90,0,0) * transform.rotation; // Rotate 90 around X ``````The transform.right etc is messing it up, because it is changing too and you are accounting for the current rotation by using it in your calculation. more ▼ answered Jun 23 '12 at 10:03 AM whydoidoit 33.7k ● 14 ● 24 ● 105 ...you again :) Thank you for this quick answer, however it does not work. In fact using this VISUALLY gives me rotation on: Y,Z,X,Z... etc. Jun 23 '12 at 10:10 AM lvictorino Ugh - bloody quaternion rotations - sorry you need to do this: `````` _nextRot = Quaternion.Euler(90,0,0) * transform.rotation; // Rotate 90 around X `````` Jun 23 '12 at 10:11 AM whydoidoit Always feels unnatural to me :) Jun 23 '12 at 10:12 AM whydoidoit Damn! I didn't know that order was important in Quaternion maths. Thank you A LOT. Jun 23 '12 at 10:14 AM lvictorino you need to read up on Peano's axioms, Victor Jun 23 '12 at 10:55 AM Fattie add new comment (comments are locked) 10|3000 characters needed characters left ▼ Viewable by all users
Your answer

### Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

Topics:

x2249
x1336
x459

asked: Jun 23 '12 at 10:00 AM

Seen: 723 times

Last Updated: Jun 23 '12 at 08:20 PM