C++ Acceptance Radius doesn't seem to work

Development Programming & Scripting C++
, ,
1

Hi! I’m currently trying to implement simple navigation into my game using C++ but I can’t seem to get the acceptance radius to work. I’m trying to make a character run after me and stop when they’re close enough.

Here’s the code for the entire function (inside of a custom AIController):

void ALocalAIControllerNPC::MoveToTarget()
{
	if (NavSystem != nullptr)
	{
		if (GetPawn() != nullptr)
		{
			if (TargetActor != nullptr)
			{
				UNavigationPath* PathToActor = NavSystem->FindPathToActorSynchronously(this,GetPawn()->GetActorLocation(), TargetActor);
				FAIMoveRequest NewMoveRequest;
				NewMoveRequest.SetAcceptanceRadius(500);
				GetPathFollowingComponent()->RequestMove(NewMoveRequest, PathToActor->GetPath());
			}
		}
	}
}

It doesn’t matter what I put into SetAcceptanceRadius(), the character still runs into me and keep going without stopping. Why is this? I looked into the RequestMove() function and found this line:

const float UseAcceptanceRadius = (RequestData.GetAcceptanceRadius() == UPathFollowingComponent::DefaultAcceptanceRadius) ? MyDefaultAcceptanceRadius : RequestData.GetAcceptanceRadius();

I’m not sure exactly how to parse this. Can someone please explain this line?

If there’s any additional information needed, feel free to ask.

2

Have you tried explicitly setting the goal location or goal actor on your Move Request? You can set an actor or position directly in the constructor or you can call a method to set the goal. I don’t think it uses the path for the goal. It uses it for the destination which is a different concept.

RequestMove() should output info to the log. So you can look there for more info as well to see if there’s anything going on.

3

Hi, thank you for your answer! I never tried that but I opted to changing the code to use the normal MoveTo() function and shelved the above approach for now. It works ok but if I feel like I need more control in future I will look into the things you mentioned. Thanks!