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Question by aguskos · Apr 22, 2020 at 09:29 PM · rotationrotate objectrotation axis

How to create quaternion defined by angle and up vector

So I want to create rotation defined by up vector and angle. I tried Quaternion.AngleAxis(angle, transform.up) but it doesn't work. transform.RotateAround works but I don't want to rotate by some angle, I want to create rotation with exact angle.

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Answer by Bunny83 · Apr 25, 2020 at 12:33 AM

So if you want to rotate an object around the local up vector relative to the worldspace forward axis you can do:

 Vector3 fwd = Quaternion.Euler(0, angle, 0) * Vector3.forward;
 Vector4 right = Vector3.Cross(upVector, fwd);
 fwd = Vector3.Cross(right, upVector);
 
 Quaternion q = Quaternion.LookRotation(fwd, upVector);

This should calculate a rotation around the provided up vector relative to the world forward axis.

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avatar image aguskos · Apr 25, 2020 at 11:40 AM 0
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Thank you very much again, that's what I was looking for

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Answer by CiberX15 · Apr 23, 2020 at 12:58 AM

Sounds like what you are looking for is Quaternion.LookRotation(forwardVector, upVector); https://docs.unity3d.com/ScriptReference/Quaternion.LookRotation.html

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avatar image aguskos · Apr 23, 2020 at 01:59 PM 0
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but I don't know how to get this forward vector, I can't rotate vector3 because it will ignore existing rotation, and I can't use transform.forward because it will add to rotation and not set rotation with a specified angle and the object will spin like crazy.

avatar image CiberX15 aguskos · Apr 24, 2020 at 12:17 AM 0
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Ah, you can get a rotated forward vector without actually rotating anything by multiplying by a Quaternion.

 Vector3 rotatedForward = Quaternion.Euler(0, angle,0) * transform.forward;

That would give you the vector as if you had rotated your transform angle degrees on the Y axis. If you then wanted to set something to that rotation you could combine in with Quaternion.LookRotation() as such:

 Vector3 rotatedForward = Quaternion.Euler(0, angle,0) * transform.forward;
 transform.rotation = Quaternion.LookRotation(rotatedForward, Vector3.up);

avatar image aguskos CiberX15 · Apr 24, 2020 at 02:03 PM 0
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Sorry for being annoying but this is not it, it will infinitely rotate on the object because we always rotate forward vector what I want is to rotate the object to specified angle.

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