Projectile Curve for predetermined target

Development Programming & Scripting C++
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7

Okay I’m done and really happy with the results. I’ll put them here for reference:

First, I use a UCurveFloat in C++ which can be set in blueprint and is used for easing the movement, as discussed before:

UPROPERTY(EditDefaultsOnly, BlueprintReadWrite)
UCurveFloat* EasingCurve;

I also calculated nice tangents which work well for my magic projectiles:

	FOccluderVertexArray Points;
	Points.Add(Start);
	Points.Add(TargetLocation);

	FVector Tangent1, Tangent2;
	Tangent1 = Tangent2 = TargetLocation - Start;

	Tangent1 = Tangent1.RotateAngleAxis(Angle, FVector(0, 0, 1));
	Tangent1 *= 2;

	Tangent2 = Tangent2.RotateAngleAxis(-Angle, FVector(0, 0, 1));
	Tangent2 *= 1;

	Spline->SetSplineWorldPoints(Points);
	Spline->SetTangentsAtSplinePoint(0, Tangent1, Tangent1, ESplineCoordinateSpace::World);
	Spline->SetTangentsAtSplinePoint(1, Tangent2, Tangent2, ESplineCoordinateSpace::World);

	TimeTotal = Spline->GetSplineLength() / Speed;

Ticking is almost the same as before:

void AAbilityProjectile::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);

	if (IsValid(TargetActor))
	{
		TargetLocation = TargetActor->GetActorLocation();
		Spline->SetLocationAtSplinePoint(1, TargetLocation, ESplineCoordinateSpace::World);
	}

	TimePassed += DeltaTime;

	float Tween = EasingCurve->GetFloatValue(TimePassed / TimeTotal);
		
	float Dist = Tween * Spline->GetSplineLength();

	FVector Location = Spline->GetWorldLocationAtDistanceAlongSpline(Dist);
	FRotator Rotation = Spline->GetWorldRotationAtDistanceAlongSpline(Dist);

	PaperFlipbookComponent->SetWorldLocation(Location);
	PaperFlipbookComponent->SetWorldRotation(Rotation + FRotator(0,0,-90));


	if (TimePassed >= TimeTotal)
	{
		if (GetWorld()->IsServer())
		{
			HandleTargetHit();
		}
		Destroy();
	}
}

TimeTotal is now based on the spline length which means that from my 3 projectiles, the one with Angle == 0 arrives first. Visually that looks a bit odd so I am thinking to base TimeTotal on the length between start and end vector instead of the spline length but that is an easy change.

Thanks again for your inputs!

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