Unreal to Unity quaternion/euler

Unity Engine
,
1

I’m trying to match the rotation of some objects between Unreal and Unity.
I got most of the way there by using euler angles like this: new Vector3(x: unrealX, y: unrealZ, z: unrealY);
But some objects are just completely wrong.

I’m struggling to work out how to convert a Unreal quaternion into a Unity one. I’ve tried creating a new quaternion in Unity matching the xyzw, and tried with the flipped values like I do with the position (Y/Z flipped), and lots of variations, but none are right.

Thanks!

2

probably this will work: How to Convert Right-Handed to Left-Handed Coordinates and Quaternions In Unity - CodeProject

3

600×503 40.1 KB

Hey, thanks for the response! Unreal is also left handed though I think.

4

Ah, ok… Thanks for the clarification

Not sure but this may work:

    return new Quaternion (rightHandedQuaternion.x,
                         - rightHandedQuaternion.z,
                           rightHandedQuaternion.y,
                           rightHandedQuaternion.w);

or maybe this (not sure):

    return new Quaternion (rightHandedQuaternion.x,
                           rightHandedQuaternion.z,
                         - rightHandedQuaternion.y,
                           rightHandedQuaternion.w);

credits: Reddit - Dive into anything (User HighRelevancy)

EDIT: Sorry, they are talking about vectors not quaternions… I guess I am not of any help. :frowning: