Chosing the side of a door using lock device

Development Programming & Scripting Devices
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2

sounds like you want to use the dot product to determine if your player is in front of the door or behind the door.

something like this:

FVector A = ReferenceLocation;
FVector Forward = ReferenceForwardVector.GetSafeNormal();
FVector ToTarget = (TargetLocation - A).GetSafeNormal();

float Dot = FVector::DotProduct(Forward, ToTarget);

if (Dot > 0.0f)
{
    // Target is in front
}
else
{
    // Target is behind
}