Snap parent to location of child

Scripting C# & .NET
1

I’m working in VR and have an object representing a key to a door. It has one child called keyTip. I have a collider in the keyhole called keySlot.

Whenever the keyTip is moved within the keySlot collider, I would like to snap the position of the key so that the center of the keyTip child object lines up with the center of the keySlot object.

(I know I could position the keySlot where I want the center of the key to end up, but I want to account for various sized keys)

This moves the center of the key to the center of the slot, which is not what I want:

key.transform.position = keySlot.transform.position

This moves the keyTip child object to the center of the slot without moving the parent, which is not what I want:

keyTip.transform.position = keySlot.transform.position

Do I manually need to calculate the offset of the keyTip within the key object and offset the final position of the key by that amount?

2

Yes. Use Transform.TransformPoint or Transform.InverseTransformPoint depending on where you’re doing the calculation.