FHitResult AGameplayAbilityTargetActor_GroundTrace::PerformTrace(AActor* InSourceActor)
{
static const FName LineTraceSingleName(TEXT("AGameplayAbilityTargetActor_GroundTrace"));
bool bTraceComplex = false;
FCollisionQueryParams Params(LineTraceSingleName, bTraceComplex);
Params.bReturnPhysicalMaterial = true;
Params.bTraceAsyncScene = true;
Params.AddIgnoredActor(InSourceActor);
FVector TraceStart = StartLocation.GetTargetingTransform().GetLocation();// InSourceActor->GetActorLocation();
FVector TraceEnd;
AimWithPlayerController(InSourceActor, Params, TraceStart, TraceEnd); //Effective on server and launching client only
// ------------------------------------------------------
FHitResult ReturnHitResult;
//Use a line trace initially to see where the player is actually pointing
LineTraceWithFilter(ReturnHitResult, InSourceActor->GetWorld(), Filter, TraceStart, TraceEnd, TraceProfile.Name, Params);
//Default to end of trace line if we don't hit anything.
if (!ReturnHitResult.bBlockingHit)
{
ReturnHitResult.Location = TraceEnd;
}
//Second trace, straight down. Consider using InSourceActor->GetWorld()->NavigationSystem->ProjectPointToNavigation() instead of just going straight down in the case of movement abilities (flag/bool).
TraceStart = ReturnHitResult.Location - (TraceEnd - TraceStart).GetSafeNormal(); //Pull back very slightly to avoid scraping down walls
TraceEnd = TraceStart;
TraceStart.Z += CollisionHeightOffset;
TraceEnd.Z -= 99999.0f;
LineTraceWithFilter(ReturnHitResult, InSourceActor->GetWorld(), Filter, TraceStart, TraceEnd, TraceProfile.Name, Params);
//if (!ReturnHitResult.bBlockingHit) then our endpoint may be off the map. Hopefully this is only possible in debug maps.
bLastTraceWasGood = true; //So far, we're good. If we need a ground spot and can't find one, we'll come back.
//Use collision shape to find a valid ground spot, if appropriate
if (CollisionShape.ShapeType != ECollisionShape::Line)
{
ReturnHitResult.Location.Z += CollisionHeightOffset; //Rise up out of the ground
TraceStart = InSourceActor->GetActorLocation();
TraceEnd = ReturnHitResult.Location;
TraceStart.Z += CollisionHeightOffset;
bLastTraceWasGood = AdjustCollisionResultForShape(TraceStart, TraceEnd, Params, ReturnHitResult);
if (bLastTraceWasGood)
{
ReturnHitResult.Location.Z -= CollisionHeightOffset; //Undo the artificial height adjustment
}
}
if (AGameplayAbilityWorldReticle* LocalReticleActor = ReticleActor.Get())
{
LocalReticleActor->SetIsTargetValid(bLastTraceWasGood);
LocalReticleActor->SetActorLocation(ReturnHitResult.Location);
}
// Reset the trace start so the target data uses the correct origin
ReturnHitResult.TraceStart = StartLocation.GetTargetingTransform().GetLocation();
return ReturnHitResult;
}
void AGameplayAbilityTargetActor_Trace::AimWithPlayerController(const AActor* InSourceActor, FCollisionQueryParams Params, const FVector& TraceStart, FVector& OutTraceEnd, bool bIgnorePitch) const
{
if (!OwningAbility) // Server and launching client only
{
return;
}
APlayerController* PC = OwningAbility->GetCurrentActorInfo()->PlayerController.Get();
check(PC);
FVector ViewStart;
FRotator ViewRot;
PC->GetPlayerViewPoint(ViewStart, ViewRot);
const FVector ViewDir = ViewRot.Vector();
FVector ViewEnd = ViewStart + (ViewDir * MaxRange);
ClipCameraRayToAbilityRange(ViewStart, ViewDir, TraceStart, MaxRange, ViewEnd);
FHitResult HitResult;
LineTraceWithFilter(HitResult, InSourceActor->GetWorld(), Filter, ViewStart, ViewEnd, TraceProfile.Name, Params);
const bool bUseTraceResult = HitResult.bBlockingHit && (FVector::DistSquared(TraceStart, HitResult.Location) <= (MaxRange * MaxRange));
const FVector AdjustedEnd = (bUseTraceResult) ? HitResult.Location : ViewEnd;
FVector AdjustedAimDir = (AdjustedEnd - TraceStart).GetSafeNormal();
if (AdjustedAimDir.IsZero())
{
AdjustedAimDir = ViewDir;
}
if (!bTraceAffectsAimPitch && bUseTraceResult)
{
FVector OriginalAimDir = (ViewEnd - TraceStart).GetSafeNormal();
if (!OriginalAimDir.IsZero())
{
// Convert to angles and use original pitch
const FRotator OriginalAimRot = OriginalAimDir.Rotation();
FRotator AdjustedAimRot = AdjustedAimDir.Rotation();
AdjustedAimRot.Pitch = OriginalAimRot.Pitch;
AdjustedAimDir = AdjustedAimRot.Vector();
}
}
OutTraceEnd = TraceStart + (AdjustedAimDir * MaxRange);
}
FHitResult AGameplayAbilityTargetActor_SingleLineTrace::PerformTrace(AActor* InSourceActor)
{
static const FName LineTraceSingleName(TEXT("AGameplayAbilityTargetActor_SingleLineTrace"));
bool bTraceComplex = false;
TArray<AActor*> ActorsToIgnore;
ActorsToIgnore.Add(InSourceActor);
FCollisionQueryParams Params(LineTraceSingleName, bTraceComplex);
Params.bReturnPhysicalMaterial = true;
Params.bTraceAsyncScene = true;
Params.AddIgnoredActors(ActorsToIgnore);
FVector TraceStart = StartLocation.GetTargetingTransform().GetLocation();// InSourceActor->GetActorLocation();
FVector TraceEnd;
AimWithPlayerController(InSourceActor, Params, TraceStart, TraceEnd); //Effective on server and launching client only
// ------------------------------------------------------
FHitResult ReturnHitResult;
LineTraceWithFilter(ReturnHitResult, InSourceActor->GetWorld(), Filter, TraceStart, TraceEnd, TraceProfile.Name, Params);
//Default to end of trace line if we don't hit anything.
if (!ReturnHitResult.bBlockingHit)
{
ReturnHitResult.Location = TraceEnd;
}
if (AGameplayAbilityWorldReticle* LocalReticleActor = ReticleActor.Get())
{
LocalReticleActor->SetActorLocation(ReturnHitResult.Location);
LocalReticleActor->SetIsTargetAnActor(ReturnHitResult.bBlockingHit && (ReturnHitResult.Actor != NULL));
}
if (bDebug)
{
DrawDebugLine(GetWorld(), TraceStart, TraceEnd, FColor::Green);
DrawDebugSphere(GetWorld(), TraceEnd, 100.0f, 16, FColor::Green);
}
return ReturnHitResult;
}