how do I access the topmost parent of an object with multiple parents

I’m trying to access the variables of the topmost parent of a multi-level hierarchy (with multiple “generations” of parents, so to speak) directly without using GameObject.Find() or the like (which require a lot of processor overhead if there are many parents.)

I can’t seem to find any way other than GameObject.Find() and other ‘search’ functions like it. As far as I’m aware, “transform.parent” only returns the immediate parent.

I’d prefer to access it somewhat directly like “transform.parent” allows (if at all possible), so is there any generic way to do that quickly, easily, and efficiently?

Assuming you have a hierarchy like this:

  • Top Parent
  • Child 1
  • Child 2
    - Child 3

If you are at Child 3 and you want to get access to Top Parent you need to use Transform.root. It will return the top most parent of a GameObject. Here is an example from the script reference:

public class ExampleClass : MonoBehaviour {
    void OnCollisionEnter(Collision collision) {
        if (collision.transform.root != transform.root)
            print("The colliding objects are not in the same hierarchy");
        
    }
}

This example is checking if two colliding objects are within the same hierarchy by comparing their top most parents. This is done using the transform.root.