Question How to calculate a position between object A and B?

So I have two positions and I want a position that is always the same distance away from object A and is at object B's direction. Here is what I tried:

Code (CSharp):

1.                    
2. Vector3 dir = Vector3.Normalize(hitInfo.point - Camera.main.transform.position);
3. Vector3 pos = Camera.main.transform.position + dir * distance; // distance is 2
4. placeableObject.transform.position = new Vector3(pos.x, 0.5f, pos.z);

The problem is, when B is moving further away from A, the dir vector is changing as well and the position I'm looking is for is moving further away from A as well. The directions are good, but I don't know how to calculate a position that is always the same distance away from A.

 

Vector3.Distance is what you want.
https://docs.unity3d.com/ScriptReference/Vector3.Distance.html

 

Well, not really. Or at least I don't know how this would be useful in my case.
I'm not looking for the distance variable, that would be constantly 2 or whatever I change it to.
I want to calculate a position that is always x distance away from point A.

 

Aah I see, I misunderstood the question. So you need to find the line between two vector3s and then a specific distance down it from point A. The following thread gives a good answer to that.
https://forum.unity.com/threads/find-a-point-on-a-line-between-two-vector3.140700/

 

Got it working. Thank you so much!