How can I rotate along X Z while my Y is not affected?

Unity Engine
1

Hello,

I am trying to rotate a gameobject (say Cube of 4x1x4). My game is Top-Down view and the Gameobject falls from
the TOP and is acted upon gravity. While I am trying to control the movement of the gameobject, I am trying it to rotate in the fashion I tilt my handheld device. Say I place my handheld - horizontal to the ground and If I happen to tilt it towards myself I would like to see the gameobject tilt in the same way as my handheld. If I could say, The gameobject should act like a mirror to the ipad.

However though, during the game the gameobject suffers rotation along Y axis. If it so happens, with the code below the object rotates to it’s X axis rather than rotating the object in the way I tilt it. Also I would like to note that my tilt at most not affect the transform rotations along Y axis.

CODE :

targetRotation = Quaternion.Euler(reqAngle.x, transform.eulerAngles.y, reqAngle.z); // Y is from it's transform
transform.rotation = Quaternion.RotateTowards(transform.rotation, targetRotation, Time.deltaTime * 100f);

INPUT :
My input is based of acceleration and I calculate the angles from those values.

Developers, I am working alone and I am stuck here. I am not sure why and what is the problem or how to tackle it in
another approach. Your help is much appreciated.

Thank you Please…

IMAGES :

With Y Rotation

Without Y rotation

What Happens

What I require

2

why dont you try this:

Quaternion targetRotation;
float reqAngleX;
float reqAngleZ;
reqAngleX = //here goes the value of the angle you want to rotate to in x;
reqAngleZ = //here goes the value of the angle you want to rotate to in z;
targetRotation = Quaternion.Euler(reqAngleX, transform.rotation.y, reqAngleZ);
transform.rotation = Quaternion.RotateTowards(transform.rotation, targetRotation, Time.deltaTime);

I would recomend not to multiply the deltaTime till you get it working as you wont, just for debugging reasons.

3

Matiasgil as it is Quaternion changing or accessing individual variable (say ‘y’ or ‘w’) is not recommended by unity itself. Thats why I went for Euler angle.
Eventhough I did try it out. It did create some noise.

Did you try and did it work for you? If so let me know, I might have made a mistake somewhere.

4

no i didnt test it, i will test it tomorrow and i will give you a feedback.

5

Thanks Matiasgil. I appreciate your help. I wish to use angles rather than Vectors as angle help to solve my issue.

6

If you want to use angles, rather than vectors you can use this:

Quaternion angle;
angle = Quaternion.AngleAxis(10, transform.up); /* transform.up is the normalized vector the angle is calculated with */
transform.rotation = Quaternion.RotateTowards(transform.rotation, angle, Time.deltaTime);