[first person] Have a Viewmodel Slerp Rotation to the Player's Camera while Parented

I'm currently trying to make an fps script that has a view model that slerps to the players camera rotation. what I need is some way to have the viewmodel ignore the parented rotation and, instead, slerp to the camera rotation (similarly to what you might see in Half Life 2, if that's a good example).

 

I don't really understand what you mean, but you can use the local vs global rotation of an object with someObject.transform.localRotation (relative to parent) and someObject.transform.rotation (global).

 

What happens is that the viewmodel is a child of the FPS character object, making it rotate with the parent(the FPS character). What I want is to make the rotation of the viewmodel Slerp and not immediately rotate with the parent but rather slowly move towards the FPS character's rotation, all while still having the viewmodel be a child of the FPS character.

 

What do you mean by "the viewmodel"?

 

the gun model in a first-person perspective.

 

If I get you right, you have a gameObject parented to another gameObject that rotates. But you want the child object to ignore the rotation of its parents. Right? If so, then I would suggestion two appraoches:
1. Don't parent the gameObject at all, rather, make a script that copies the (speudo) parent gameObject position.
2. Make a script that replaces the child object rotation by your own desired rotation.
Both approaches would required to be applied in LateUpdate or by configuring the script execution order such that the parent moves before the child transform is modified.