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Question by The-Evster · Aug 20, 2016 at 11:17 PM · rotationquaternionlookrotationy-axis

More specific Quaternion.LookRotation

I have a gun script set up so that when you shoot something a bullet hole will appear the code:

 Quaternion.LookRotation(hit.normal)

but i want the bullet to have a random rotation on the Y axis. not sure how to do it and was hoping someone can help. thanks in advance.

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Answer by Bunny83 · Aug 21, 2016 at 01:04 AM

Quaternion.LookRotation actually has two parameters. The first parameter is the major-axis, the z-axis. The second parameter is a hint direction vector which defines the desired up direction. If you don't pass a direction vector for the up direction it default so Vector3.up. So the rotation will always be oriented in a way so the y axis is closest to the world y axis.

If you just want to randomly rotate the object around the z axis you can use Quaternion.AngleAxis to create a random rotation around the z axis and multiply the result of Quaternion.LookRotation with that one. Rotating around a different axis than the z-axis wouldn't make much sense since it would change the result of LookRotation so it won't face that direction anymore.

 Quaternion.AngleAxis(Random.Range(0f,360f),hit.normal) * Quaternion.LookRotation(hit.normal);

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