From point A, Get the location X units behind B

[WhiteTeapot]

Given the 2 locations A and B. How would you get the location of C ?
C being a point X units “behind” Point B from the direction of A?

Sadly this has already seems to have been answered in 2016…

Starting from point A, get location X distance along given direction

We have 2 points. Point A and Point B. We want to create a new point (Point C) that is located 100 units away from point A in the direction of point B. GetDirectionVector will give me the direction from Point A to Point B. How do i actually work out the position 100 units along that direction starting from Point A. Thanks guys, Vector math is the bane of my existence ;).

but the link to the answer has broken? and now points to an unanswered question about swarm…

[WhiteTeapot]

Rubber Ducky Answer

I created a BP with 3 cubes, Point A, B, C.

My method begins with putting the world location of A and B into a GetUnitDirection (Vector) Node.
You then multiply the return vector by the X units “behind” you desire.
This value must then be added to the world location of Point B.
I’m teleporting Point C to this location for demonstration.

Thanks pezzott1 for explaining

From point A, Get the location X units behind B

Get Unit Direction Vector gets the direction vector of length 1 that aims from A to B. The scalar XUnits is offseting that vector by multiplying its value. You then add the offsetted vector with the B wolrd location to place C. Basical its: get direction from A to B and move X Units in that direction starting from B location.

[pezzott1]

@WhiteTeapot

The only problem remaining is that I cannot properly explain why this works.

Get Unit Direction Vector gets the direction vector of length 1 that aims from A to B.

The scalar XUnits is offseting that vector by multiplying its value.

You then add the offsetted vector with the B wolrd location to place C.

Basical its: get direction from A to B and move X Units in that direction starting from B location.

[WhiteTeapot]

Thanks friend. I’m going to throw in a bunch of search terms as this was a really difficult problem to search for.

Get location behind player from other character.
How to get a location behind an actor set distance away. Location behind player from point. Facing direction behind point. Facing direction behind actor. Find point behind other actor. Get a point distance away from another point. Find location behind character from another character.

[pezzott1]

@WhiteTeapot

Get location behind player from other character.
How to get a location behind an actor set distance away. Location behind player from point. Facing direction behind point. Facing direction behind actor. Find point behind other actor. Get a point distance away from another point. Find location behind character from another character.

This looks like problems to solve using the Dot Product.

Dot