C++ UPrimitiveComponent::IsSimulatingPhysics方法代码示例

void AActor::GatherCurrentMovement()
{
	UPrimitiveComponent* RootPrimComp = Cast<UPrimitiveComponent>(GetRootComponent());
	if (RootPrimComp && RootPrimComp->IsSimulatingPhysics())
	{
		FRigidBodyState RBState;
		RootPrimComp->GetRigidBodyState(RBState);

		ReplicatedMovement.FillFrom(RBState);
	}
	else if(RootComponent != NULL)
	{
		// If we are attached, don't replicate absolute position
		if( RootComponent->AttachParent != NULL )
		{
			// Networking for attachments assumes the RootComponent of the AttachParent actor. 
			// If that's not the case, we can't update this, as the client wouldn't be able to resolve the Component and would detach as a result.
			if( AttachmentReplication.AttachParent != NULL )
			{
				AttachmentReplication.LocationOffset = RootComponent->RelativeLocation;
				AttachmentReplication.RotationOffset = RootComponent->RelativeRotation;
				AttachmentReplication.RelativeScale3D = RootComponent->RelativeScale3D;
			}
		}
		else
		{
			ReplicatedMovement.Location = RootComponent->GetComponentLocation();
			ReplicatedMovement.Rotation = RootComponent->GetComponentRotation();
			ReplicatedMovement.LinearVelocity = GetVelocity();
			ReplicatedMovement.bRepPhysics = false;
		}
	}
}

bool UPrimitiveComponent::WeldToImplementation(USceneComponent * InParent, FName ParentSocketName /* = Name_None */, bool bWeldSimulatedChild /* = false */)
{
	//WeldToInternal assumes attachment is already done
	if (AttachParent != InParent || AttachSocketName != ParentSocketName)
	{
		return false;
	}

	//Check that we can actually our own socket name
	FBodyInstance* BI = GetBodyInstance(NAME_None, false);
	if (BI == NULL)
	{
		return false;
	}

	if (BI->ShouldInstanceSimulatingPhysics() && bWeldSimulatedChild == false)
	{
		return false;
	}

	UnWeldFromParent();	//make sure to unweld from wherever we currently are

	FName SocketName;
	UPrimitiveComponent * RootComponent = GetRootWelded(this, ParentSocketName, &SocketName, true);

	if (RootComponent)
	{
		if (FBodyInstance* RootBI = RootComponent->GetBodyInstance(SocketName, false))
		{
			if (BI->WeldParent == RootBI)	//already welded so stop
			{
				return true;
			}

			BI->bWelded = true;
			//There are multiple cases to handle:
			//Root is kinematic, simulated
			//Child is kinematic, simulated
			//Child always inherits from root

			//if root is kinematic simply set child to be kinematic and we're done
			if (RootComponent->IsSimulatingPhysics(SocketName) == false)
			{
				BI->WeldParent = NULL;
				SetSimulatePhysics(false);
				return false;	//return false because we need to continue with regular body initialization
			}

			//root is simulated so we actually weld the body
			FTransform RelativeTM = RootComponent == AttachParent ? GetRelativeTransform() : GetComponentToWorld().GetRelativeTransform(RootComponent->GetComponentToWorld());	//if direct parent we already have relative. Otherwise compute it
			RootBI->Weld(BI, GetComponentToWorld());
			BI->WeldParent = RootBI;

			return true;
		}
	}

	return false;
}

void ALeapMotionHandActor::UpdateBones(float DeltaSeconds)
{
	if (BoneActors.Num() == 0) { return; }

	float CombinedScale = GetCombinedScale();

	FLeapMotionDevice* Device = FLeapMotionControllerPlugin::GetLeapDeviceSafe();
	if (Device && Device->IsConnected())
	{
		int BoneArrayIndex = 0;
		for (ELeapBone LeapBone = bShowArm ? ELeapBone::Forearm : ELeapBone::Palm; LeapBone <= ELeapBone::Finger4Tip; ((int8&)LeapBone)++)
		{
			FVector TargetPosition;
			FRotator TargetOrientation;

			bool Success = Device->GetBonePostionAndOrientation(HandId, LeapBone, TargetPosition, TargetOrientation);

			if (Success)
			{
				// Offset target position & rotation by the SpawnReference actor's transform
				FQuat RefQuat = GetRootComponent()->GetComponentRotation().Quaternion();
				TargetPosition = RefQuat * TargetPosition * CombinedScale + GetRootComponent()->GetComponentLocation();
				TargetOrientation = (RefQuat * TargetOrientation.Quaternion()).Rotator();

				// Get current position & rotation
				ALeapMotionBoneActor* BoneActor = BoneActors[BoneArrayIndex++];

				UPrimitiveComponent* PrimitiveComponent = Cast<UPrimitiveComponent>(BoneActor->GetRootComponent());
				if (PrimitiveComponent && PrimitiveComponent->IsSimulatingPhysics())
				{
					FVector CurrentPositon = PrimitiveComponent->GetComponentLocation();
					FRotator CurrentRotation = PrimitiveComponent->GetComponentRotation();

					// Compute linear velocity
					FVector LinearVelocity = (TargetPosition - CurrentPositon) / DeltaSeconds;

					// Compute angular velocity
					FVector Axis;
					float Angle;
					ConvertDeltaRotationsToAxisAngle(CurrentRotation, TargetOrientation, Axis, Angle);
					if (Angle > PI) { Angle -= 2 * PI; }
					FVector AngularVelcity = Axis * (Angle / DeltaSeconds);

					// Apply velocities
					PrimitiveComponent->SetPhysicsLinearVelocity(LinearVelocity);
					PrimitiveComponent->SetAllPhysicsAngularVelocity(AngularVelcity * 180.0f / PI);
				}
			}
		}
	}
}

void UBuoyancyForceComponent::TickComponent(float DeltaTime, enum ELevelTick TickType, FActorComponentTickFunction *ThisTickFunction)
{
	Super::TickComponent(DeltaTime, TickType, ThisTickFunction);

	// If disabled or we are not attached to a parent component, return.
	if (!bIsActive || !GetAttachParent()) return;

	if (!OceanManager) return;

	UPrimitiveComponent* BasePrimComp = Cast<UPrimitiveComponent>(GetAttachParent());
	if (!BasePrimComp) return;

	if (!BasePrimComp->IsSimulatingPhysics())
	{
		if (!SnapToSurfaceIfNoPhysics) return;

		UE_LOG(LogTemp, Warning, TEXT("Running in no physics mode.."));

		float waveHeight = OceanManager->GetWaveHeightValue(BasePrimComp->GetComponentLocation(), World, true, TwoGerstnerIterations).Z;
		BasePrimComp->SetWorldLocation(FVector(BasePrimComp->GetComponentLocation().X, BasePrimComp->GetComponentLocation().Y, waveHeight));
		return;
	}

	//Get gravity
	float Gravity = BasePrimComp->GetPhysicsVolume()->GetGravityZ();

	//--------------- If Skeletal ---------------
	USkeletalMeshComponent* SkeletalComp = Cast<USkeletalMeshComponent>(GetAttachParent());
	if (SkeletalComp && ApplyForceToBones)
	{
		TArray<FName> BoneNames;
		SkeletalComp->GetBoneNames(BoneNames);

		for (int32 Itr = 0; Itr < BoneNames.Num(); Itr++)
		{
			FBodyInstance* BI = SkeletalComp->GetBodyInstance(BoneNames[Itr], false);
			if (BI && BI->IsValidBodyInstance()
				&& BI->bEnableGravity) //Buoyancy doesn't exist without gravity
			{
				bool isUnderwater = false;
				//FVector worldBoneLoc = SkeletalComp->GetBoneLocation(BoneNames[Itr]);
				FVector worldBoneLoc = BI->GetCOMPosition(); //Use center of mass of the bone's physics body instead of bone's location
				FVector waveHeight = OceanManager->GetWaveHeightValue(worldBoneLoc, World, true, TwoGerstnerIterations);

				float BoneDensity = MeshDensity;
				float BoneTestRadius = FMath::Abs(TestPointRadius);
				float SignedBoneRadius = FMath::Sign(Gravity) * TestPointRadius; //Direction of radius (test radius is actually a Z offset, should probably rename it!). Just in case we need an upside down world.

				//Get density & radius from the override array, if available.
				for (int pointIndex = 0; pointIndex < BoneOverride.Num(); pointIndex++)
				{
					FStructBoneOverride Override = BoneOverride[pointIndex];

					if (Override.BoneName.IsEqual(BoneNames[Itr]))
					{
						BoneDensity = Override.Density;
						BoneTestRadius = FMath::Abs(Override.TestRadius);
						SignedBoneRadius = FMath::Sign(Gravity) * BoneTestRadius;
					}
				}

				//If test point radius is below water surface, add buoyancy force.
				if (waveHeight.Z > (worldBoneLoc.Z + SignedBoneRadius))
				{
					isUnderwater = true;

					float DepthMultiplier = (waveHeight.Z - (worldBoneLoc.Z + SignedBoneRadius)) / (BoneTestRadius * 2);
					DepthMultiplier = FMath::Clamp(DepthMultiplier, 0.f, 1.f);

					float Mass = SkeletalComp->CalculateMass(BoneNames[Itr]); //Mass of this specific bone's physics body

					 /**
					* --------
					* Buoyancy force formula: (Volume(Mass / Density) * Fluid Density * -Gravity) / Total Points * Depth Multiplier
					* --------
					*/
					float BuoyancyForceZ = Mass / BoneDensity * FluidDensity * -Gravity * DepthMultiplier;

					//Velocity damping.
					FVector DampingForce = -BI->GetUnrealWorldVelocity() * VelocityDamper * Mass * DepthMultiplier;

					//Experimental xy wave force
					if (EnableWaveForces)
					{
						float waveVelocity = FMath::Clamp(BI->GetUnrealWorldVelocity().Z, -20.f, 150.f) * (1 - DepthMultiplier);
						DampingForce += FVector(OceanManager->GlobalWaveDirection.X, OceanManager->GlobalWaveDirection.Y, 0) * Mass * waveVelocity * WaveForceMultiplier;
					}

					//Add force to this bone
					BI->AddForce(FVector(DampingForce.X, DampingForce.Y, DampingForce.Z + BuoyancyForceZ));
					//BasePrimComp->AddForceAtLocation(FVector(DampingForce.X, DampingForce.Y, DampingForce.Z + BuoyancyForceZ), worldBoneLoc, BoneNames[Itr]);
				}

				//Apply fluid damping & clamp velocity
				if (isUnderwater)
				{
					BI->SetLinearVelocity(-BI->GetUnrealWorldVelocity() * (FluidLinearDamping / 10), true);
					BI->SetAngularVelocity(-BI->GetUnrealWorldAngularVelocity() * (FluidAngularDamping / 10), true);

					//Clamp the velocity to MaxUnderwaterVelocity
//.........这里部分代码省略.........

void AFP_FirstPersonCharacter::OnFire()
{
	// Play a sound if there is one
	if (FireSound != NULL)
	{
		UGameplayStatics::PlaySoundAtLocation(this, FireSound, GetActorLocation());
	}

	// try and play a firing animation if specified
	if(FireAnimation != NULL)
	{
		// Get the animation object for the arms mesh
		UAnimInstance* AnimInstance = Mesh1P->GetAnimInstance();
		if(AnimInstance != NULL)
		{
			AnimInstance->Montage_Play(FireAnimation, 1.f);
		}
	}

	// Now send a trace from the end of our gun to see if we should hit anything
	APlayerController* PlayerController = Cast<APlayerController>(GetController());
	
	// Calculate the direction of fire and the start location for trace
	FVector CamLoc;
	FRotator CamRot;
	PlayerController->GetPlayerViewPoint(CamLoc, CamRot);
	const FVector ShootDir = CamRot.Vector();

	FVector StartTrace = FVector::ZeroVector;
	if (PlayerController)
	{
		FRotator UnusedRot;
		PlayerController->GetPlayerViewPoint(StartTrace, UnusedRot);

		// Adjust trace so there is nothing blocking the ray between the camera and the pawn, and calculate distance from adjusted start
		StartTrace = StartTrace + ShootDir * ((GetActorLocation() - StartTrace) | ShootDir);
	}

	// Calculate endpoint of trace
	const FVector EndTrace = StartTrace + ShootDir * WeaponRange;

	// Check for impact
	const FHitResult Impact = WeaponTrace(StartTrace, EndTrace);

	// Deal with impact
	AActor* DamagedActor = Impact.GetActor();
	UPrimitiveComponent* DamagedComponent = Impact.GetComponent();

	// If we hit an actor, with a component that is simulating physics, apply an impulse
	if ((DamagedActor != NULL) && (DamagedActor != this) && (DamagedComponent != NULL) && DamagedComponent->IsSimulatingPhysics())
	{
		DamagedComponent->AddImpulseAtLocation(ShootDir*WeaponDamage, Impact.Location);
	}
}