Quaternions and cube rotation.

Questions & Answers
1

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?

2

You are over complicating it :slight_smile:

  _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.