Move & rotate

Scripting C# & .NET
1

I guess this is a noob math question…

I want to “align” one object to another. Says ObjA to ObjB. ObjB has an anchor point. After alignment the anchor point of ObjB should be on the lower/center point of ObjA.
Example (ObjA = blue, ObjB = cyan):


My code is:

var boxCollider = GetComponent<BoxCollider>();
var lowerCenterPos = new Vector3(transform.localPosition.x, transform.localPosition.y - boxCollider.size.y / 2f);

var slotDisplacment = -equipmentSlot.Slot.transform.localPosition;
equipmentSlot.transform.rotation = transform.rotation;

var root = equipmentSlot.transform.root;
root.transform.position = lowerCenterPos +  slotDisplacment;

This works until objects (ObjA or ObjB) are rotated. If they are rotated my slotDisplacment is wrong because it’s in world coordinates. And

root.transform.position = lowerCenterPos +  slotDisplacment;

is wrong then.

How do I convert my offset with respect to the orientation of ObjA?

Thx,
Sven

2929840--216635--Alignment.png
2929840--216635--Alignment.png744×524 4.43 KB

2

@Sven76

Hi, there - you don’t need much else than using transform.TransformPoint.

A. Rotate your object according to reference object.
B. Apply offset relative to space of reference object… using above command.