194 - Predict Projectile Path

Source/Blaster/Weapon/Projectile.h

@@ -16,6 +16,14 @@ public:
 	AProjectile();
 	virtual void Tick(float DeltaTime) override;
 
+	// Used with server-side rewind
+	bool bUseServerSideRewind = false;
+	FVector_NetQuantize TraceStart;
+	FVector_NetQuantize100 InitialVelocity;
+
+	UPROPERTY(EditAnywhere)
+	float InitialSpeed = 15000;
+	
 protected:
 	virtual void BeginPlay() override;
 	void StartDestroyTimer();

Source/Blaster/Weapon/ProjectileBullet.cpp

@@ -12,6 +12,8 @@ AProjectileBullet::AProjectileBullet()
 	ProjectileMovementComponent = CreateDefaultSubobject<UProjectileMovementComponent>(TEXT("ProjectileMovementComponent"));
 	ProjectileMovementComponent->bRotationFollowsVelocity = true;
 	ProjectileMovementComponent->SetIsReplicated(true);
+	ProjectileMovementComponent->InitialSpeed = InitialSpeed;
+	ProjectileMovementComponent->MaxSpeed = InitialSpeed;
 }
 
 void AProjectileBullet::OnHit(UPrimitiveComponent* HitComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, FVector NormalImpulse, const FHitResult& Hit)
@@ -28,3 +30,24 @@ void AProjectileBullet::OnHit(UPrimitiveComponent* HitComp, AActor* OtherActor,
 	
 	Super::OnHit(HitComp, OtherActor, OtherComp, NormalImpulse, Hit);
 }
+
+void AProjectileBullet::BeginPlay()
+{
+	Super::BeginPlay();
+
+	FPredictProjectilePathParams PathParams;
+	PathParams.bTraceWithChannel = true;
+	PathParams.bTraceWithCollision = true;
+	PathParams.DrawDebugTime = 5.f;
+	PathParams.DrawDebugType = EDrawDebugTrace::ForDuration;
+	PathParams.LaunchVelocity = GetActorForwardVector() * InitialSpeed;
+	PathParams.MaxSimTime = 4.f;
+	PathParams.ProjectileRadius = 5.f;
+	PathParams.SimFrequency = 30.f;
+	PathParams.StartLocation = GetActorLocation();
+	PathParams.TraceChannel = ECollisionChannel::ECC_Visibility;
+	PathParams.ActorsToIgnore.Add(this);
+	
+	FPredictProjectilePathResult PathResult;
+	UGameplayStatics::PredictProjectilePath(this, PathParams, PathResult);
+}

Source/Blaster/Weapon/ProjectileBullet.h

@@ -21,5 +21,5 @@ public:
 protected:
 
 	virtual void OnHit(UPrimitiveComponent* HitComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, FVector NormalImpulse, const FHitResult& Hit) override;
-
+	virtual void BeginPlay() override;
 };