Strange quaternion rounding issue...

Unity Engine
1

Hi guys!
I hope you might give me a clue what’s going on here…

I got some really weird x-value rounding happening here, when converting from euler to quaternion and back…

Code:

 Vector3 testVec1 = new Vector3(88, 0, 0);
 Debug.Log("testVec1: Setting rotation to: " + testVec1);
 Debug.Log("testVec1: Set rotation to: " + Quaternion.Euler(testVec1).eulerAngles);

 Vector3 testVec2 = new Vector3(0, 88, 0);
 Debug.Log("testVec2: Setting rotation to: " + testVec2);
 Debug.Log("testVec2: Set rotation to: " + Quaternion.Euler(testVec2).eulerAngles);

Output:

testVec1: Setting rotation to: (88.0, 0.0, 0.0)
testVec1: Set rotation to: (90.0, 0.0, 0.0) // <== !!!  why 90 ?!?!?

testVec2: Setting rotation to: (0.0, 88.0, 0.0)
testVec2: Set rotation to: (0.0, 88.0, 0.0)

Anyone got an idea where this comes from??

2

I’m not really sure of how the conversion algorithm works, but is this the only time you need this in your code? If it is you could just hardcode -2 xD

3

The rounding seems a bit excessive, but you ought to avoid going near 90 degrees anyway, and also avoid converting from euler angles to a quaternion and back again - just remember the original euler angles, if you must, or don’t use euler angles at all.