How to adjust the direction of the missile according to the crosshair - problem

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#1

I’m working on simple game Anti Tank Guided Missile, which the missile changes the direction according to the crosshair on the middle of screen controlled by user’s mouse.

Firstly, I guided the crosshair beside the far cube then i fired the missile with re-guided the crosshair on to the cube.

The problem is, the direction of missile was changed based on the crosshair but with large error rate ( Green Debug Line of the Missile in the video shows that problem )

PlayerController - AimAt Function

int32 OUT SizeX;
int32 OUT SizeY;
GetViewportSize(SizeX, SizeY);
FVector2D CrosshairPositionOnScreen = FVector2D(SizeX * 0.5, SizeY * 0.5);

if (DeprojectScreenPositionToWorld(CrosshairPositionOnScreen.X,
		CrosshairPositionOnScreen.Y, Crosshair_3D_Location, Crosshair_3D_Direction)) {
        if (!GetKorniteOperatorPawn()) return;
        FVector OUT CameraLocation;GetKorniteOperatorPawn()->GetCameraLocation(CameraLocation);

        auto StartLocation = CameraLocation;
        auto EndLocation = StartLocation + Crosshair_3D_Direction * Range;
        DrawDebugLine(GetWorld(), StartLocation, EndLocation, FColor::Red, false, -1, 0, 10);
}

PlayerPawn - Fire Missile Function:

FVector Location = FVector(GetActorLocation().X,
		GetActorLocation().Y + 100, GetActorLocation().Z + 100); 
	FRotator Rotation = SceneCamera->GetComponentRotation();

	if (!ensure(ATGMissle_BP)) { return; }
        ATGMissle = GetWorld()->SpawnActor<AATGMissleActor>(
		ATGMissle_BP,
		Location,
		Rotation
        );

Actor - MissileActor lunched after firing by PlayerPawn - Tick Function:

auto PlayerController = Cast<AATGMPlayerController>(GetWorld()->GetFirstPlayerController());
if (!PlayerController) return;

auto CrosshairRotation = PlayerController->Crosshair_3D_Direction.Rotation();
auto ForwardVectorRotation = Missle->GetForwardVector().Rotation();
auto Rotation = CrosshairRotation - ForwardVectorRotation;

auto StartLocation = Missle->GetComponentLocation();
auto EndLocation = StartLocation + Missle->GetForwardVector() * 400000;
DrawDebugLine(GetWorld(), StartLocation, EndLocation, FColor::Green, false, -1, 0, 10);

if (!Missle) return;

Missle->AddRelativeRotation(Rotation);
auto Force = Missle->GetForwardVector() * Missle->GetMass() * Acceleration;
Missle->AddForce(DeltaTime * Force);
#2

Any Help !!

#3

Do you have your project hosted anywhere?

#4

Thanks @DanM for your response :slight_smile:
My project in my local machine, with 6GB size.
What is the folder of the project should i share and upload ?

#5

In Unreal,
File > Package Project > Zip Up Project
That will zip up only the necessary files.

#6

Mr @DanM

The link of the project in mediafire
http://www.mediafire.com/file/4rlnqjfmfnw5ry5/ATGM.zip/file

#7

What’s wrong with this exactly?

#8

Mmmm !! :slight_smile:
1-Try to make the crosshair point close to target and not directly on it.
see the picture.
test

2-Then fire the missile with moving the crosshair directly to the target (cube).

3-ِ After the crosshair is guided at the target, the missile is supposed to hit the target, but unfortunately that not happened, why !!?

#9

That’s just physics, it needs time to turn. You would probably need to add some logic to turn more sharply depending on the distance between the missile and target.

#10
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#12

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