How do I find a location between two vectors?

Development World Creation
, , , , ,
1

I want to find a point (as a vector) between two vectors based on a float value between 0 and 1? How do I find that point?

The value between 0 and 1 will be derived from a timeline.

ZoneZoomPointExplanation.jpg

I tried this but it did not work:

121402-findvectorinbetweenattempt1.jpg
121402-findvectorinbetweenattempt1.jpg971×576 117 KB

2

I think you want to Lerp (linear interpolate) between two vectors:

https://docs.unrealengine.com/latest/INT/BlueprintAPI/Math/Vector/Lerp_vector/index.html

The Alpha is the value between 0 and 1.

3

I would opt to create a direction vector from the two vectors.
Then using the distance between the two vectors you can simply take a percentage of to move the start point in the direction of your target vector by the amount you desire.

121431-direction.png
121431-direction.png977×417 62.1 KB

4

Lerping worked perfectly after some trial and error. :slight_smile:

5

C++ Version

FVector Direction = (EndPositionActor->GetActorLocation() - StartPositionActor->GetActorLocation()).GetSafeNormal();
float DistanceBetweenToFVectors = EndPositionActor->GetDistanceTo(StartPositionActor);
FVector AnswerPosition = StartPositionActor->GetActorLocation() + ( Direction * (DistanceBetweenToFVectors * 0.5f));