Find the middle between 2 rotations

Hello, I am trying to find the middle rotation between 2 rotations from one side only, I am using:

Quaternion.Lerp(angleA.rotation, angleB.rotation , 0.5f);

However the angle will jump to the shortest angle as soon as the difference is more than 180 as seen in the gif:


I appreciate any help with this.

 

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Sorry I didnt know this, thanks for the friendly and kind heads up

 

Hi, this is for euler, so it may not be what you're after, but you can try getting the middle like this:
rotA / 2 + rotB / 2
Or maybe the gentleman's way
(rotA - rotB) / 2 + rotB
Or the smooth brain way
(rotA + rotB) / 2

 

Thanks, I tried, however because it uses euler it gets into a gimbal lock problem as you can see

 

Well, Quaternion slerp uses shortest rotation path. When rotation goes over 180, shortest path lies on another side of the object.

So either you store objects in parametric fashion (euler angles), OR you use quaternions, in which case no angle can go over 180. You can't really have it both ways in 3d.

If your half-angle has some meaning, you could try tracking previous and current value of half-angle vector and flip it if previous value is too far away from the current one (meaning it flipped). But you'll be just making your life difficult, as with convoluted rotations this can lead to unexpected behavior.

 

Looks like you would store the start base rotation and when the second rotation 180 degrees plus from this point is achieved by the second rotation then the rotated angle should have 180 degrees either added or subtracted.

 

I haven't personally tested the solution presented here, but it looks like someone wrote their own version of Quaternion Lerp & Slerp to specify a direction and it's got a fair number of upvotes implying it may do the trick:

https://answers.unity.com/questions/261270/lerping-a-quaternion-the-long-way-around.html