How do I rotate an object around its local X axis by A degrees?

I have a bunch of objects for which I want to control the local X rotation with a slider (0 - 360). I've tried all sorts of Quaternion operations but I can't get the right combination to have the rotation happen in the object's local space, they always rotate in world space.

transform.Rotate() does exactly that but it's a rotate-by function and that's fine in an Update loop but here it's in an OnValueChanged() event and I need to set my objects to an absolute value each on its own X-axis, a rotate-to around the local-X-axis function.

Is there any Quaternion-brain out there that can point me in the right direction?
(pun intended)

I'm using 4.6 beta 20 if that matters here.
Thnx.

EDIT: Answered here:
http://forum.unity3d.com/threads/ho...ocal-x-axis-by-a-degrees.274408/#post-1813264
Thnx Cpt.

 

Transform.eulerAngles.

--Eric

 

This should do the trick

Code (CSharp):

1. Vector3 eulers = this.transform.rotation.eulerAngles;
2. this.transform.rotation = Quaternion.Euler(new Vector3(sliderX,eulers.y,eulers.z));
3.  
4.  

 

Or you can just use Transform.eulerAngles. It does exactly the same thing except with less code. There's no reason to do "this.transform.rotation.eulerAngles" when you can just do "transform.eulerAngles", and instead of Quaternion.Euler() you can just set transform.eulerAngles.

--Eric

 

Ah , right. Forgot about that

Code (CSharp):

1. transform.eulerAngles = new Vector3(sliderX,transform.eulerAngles.y,transform.eulerAngles.z);
2.  

 

Thanks Eric but I tried that before coming here, and transform.localEulerAngles. Also I have tried all combinations of converting Quaternions to Euler and vice versa to no avail. All for some reason result in a rotation around the world axis. The only thing that seems to do the job for me is transform.Rotate which does not work with sliders.

I guess I'll have to use two buttons instead. But I'd love to understand why the obvious transform.eulerAngles does not work here.

CORRECTION: With transform.eulerAngles the objects do revolve around their own origin but they align with the world axis. With Rotate() they rotate correctly and align correctly....

 

Thanks for the answer but it does not work. See my reply to Eric's first answer above.

 

this seems like it would work i don't know if you have tried it yet or not

Code (csharp):

1. Quaternion localRotation = Quaternion.Euler(sliderDeltaX, 0f, 0f);
2. transform.rotation = transform.rotation * localRotation;

i typed sliderDeltaX because it would only work if you create the new localRotation based on how the slider has changed since the last frame, not the actual value of the slider.

 

No, haven't tried it. I have thought about the concept but couldn't figure out how to get that delta between frames. I was losing patience so I used toggles and Rotate() instead. I will try it on my next project. This is what I made : http://michelpoisson.net/unity/Mandala.html

 

it usually only takes an extra variable and another line of code

Code (csharp):

1. private float sliderLastX = 0f;
2.  
3. void Update() {
4.     Quaternion localRotation = Quaternion.Euler(sliderX - sliderLastX, 0f, 0f);
5.     transform.rotation = transform.rotation * localRotation;
6.     sliderLastX = sliderX;
7. }

 

Yes, that did the job!
Keeping track of the slider's last position was the key.
Will definitely go into my next project.
Thanks Cpt.

 

Omg Cpt Chuckles...

 

Bro, I love you right know. I have been looking for this for days. I suspected keeping track of this was the key but couldnt make it work. Thanks a lot!