/**
* Creates a bounding box for the passed in node
*
* @param Node Node to create a bounding box for
* @param OutBox The created box
*/
void UModel::GetNodeBoundingBox( const FBspNode& Node, FBox& OutBox ) const
{
OutBox.Init();
const int32 FirstVertexIndex = Node.iVertPool;
for( int32 VertexIndex=0; VertexIndex<Node.NumVertices; VertexIndex++ )
{
const FVert& ModelVert = Verts[ FirstVertexIndex + VertexIndex ];
const FVector Vertex = Points[ ModelVert.pVertex ];
OutBox += Vertex;
}
}
FBoxSphereBounds UGameplayDebuggingComponent::CalcBounds(const FTransform& LocalToWorld) const
{
FBox MyBounds;
MyBounds.Init();
#if WITH_RECAST
if (ShouldReplicateData(EAIDebugDrawDataView::NavMesh))
{
MyBounds = NavMeshBounds;
}
#endif
#if USE_EQS_DEBUGGER
if (EQSRepData.Num() && ShouldReplicateData(EAIDebugDrawDataView::EQS))
{
MyBounds = FBox(FVector(-HALF_WORLD_MAX, -HALF_WORLD_MAX, -HALF_WORLD_MAX), FVector(HALF_WORLD_MAX, HALF_WORLD_MAX, HALF_WORLD_MAX));
}
#endif // USE_EQS_DEBUGGER
return MyBounds;
}
void UParticleModuleCollision::Update(FParticleEmitterInstance* Owner, int32 Offset, float DeltaTime)
{
SCOPE_CYCLE_COUNTER(STAT_ParticleCollisionTime);
check(Owner);
check(Owner->Component);
UWorld* World = Owner->Component->GetWorld();
if (Owner->ActiveParticles == 0 || (bDropDetail && World && World->bDropDetail))
{
return;
}
//Gets the owning actor of the component. Can be NULL if the component is spawned with the World as an Outer, e.g. in UGameplayStatics::SpawnEmitterAtLocation().
AActor* Actor = Owner->Component->GetOwner();
UParticleLODLevel* LODLevel = Owner->SpriteTemplate->GetCurrentLODLevel(Owner);
check(LODLevel);
const int32 MeshRotationOffset = Owner->GetMeshRotationOffset();
const bool bMeshRotationActive = Owner->IsMeshRotationActive();
const FTransform& OwnerTM = Owner->Component->GetAsyncComponentToWorld();
const FVector ParentScale = OwnerTM.GetScale3D();
FParticleEventInstancePayload* EventPayload = NULL;
if (LODLevel->EventGenerator)
{
EventPayload = (FParticleEventInstancePayload*)(Owner->GetModuleInstanceData(LODLevel->EventGenerator));
if (EventPayload &&
(EventPayload->bCollisionEventsPresent == false) &&
(EventPayload->bDeathEventsPresent == false))
{
EventPayload = NULL;
}
}
FParticleCollisionInstancePayload* CollisionInstPayload = (FParticleCollisionInstancePayload*)(Owner->GetModuleInstanceData(this));
const TArray<FVector>& PlayerLocations = Owner->Component->GetPlayerLocations();
TArray<float> PlayerLODDistanceFactor = Owner->Component->GetPlayerLODDistanceFactor(); //Make a copy because we need to square it later
const int32 PlayerCount = PlayerLocations.Num();
if (World->IsGameWorld())
{
bool bIgnoreAllCollision = false;
// LOD collision based on visibility
// This is at the 'emitter instance' level as it will be true or false for the whole instance...
if (bCollideOnlyIfVisible && ((World->TimeSeconds - Owner->Component->LastRenderTime) > 0.1f))
{
// no collision if not recently rendered
bIgnoreAllCollision = true;
}
else
{
// If the MaxCollisionDistance is greater than WORLD_MAX, they obviously want the check disabled...
if (MaxCollisionDistance < WORLD_MAX)
{
// If we have at least a few particles, do a simple check vs. the bounds
if (Owner->ActiveParticles > 7)
{
if (CollisionInstPayload->CurrentLODBoundsCheckCount == 0)
{
FBox BoundingBox;
BoundingBox.Init();
if (Owner->Component->Template && Owner->Component->Template->bUseFixedRelativeBoundingBox)
{
BoundingBox = Owner->Component->Template->FixedRelativeBoundingBox.TransformBy(OwnerTM);
}
else
{
// A frame behind, but shouldn't be an issue...
BoundingBox = Owner->Component->GetAsyncBounds().GetBox();
}
// see if any player is within the extended bounds...
bIgnoreAllCollision = true;
// Check for the system itself beyond beyond the bounds
// LOD collision by distance
bool bCloseEnough = false;
for (int32 PlyrIdx = 0; PlyrIdx < PlayerCount; PlyrIdx++)
{
// Invert the LOD distance factor here because we are using it to *expand* the
// bounds rather than shorten the distance checked as it is usually used for.
float InvDistanceFactor = 1.0f / PlayerLODDistanceFactor[PlyrIdx];
FBox CheckBounds = BoundingBox;
float BoxExpansionValue = MaxCollisionDistance * InvDistanceFactor;
BoxExpansionValue += BoxExpansionValue * 0.075f;
// Expand it by the max collision distance (and a little bit extra)
CheckBounds = CheckBounds.ExpandBy(BoxExpansionValue);
if (CheckBounds.IsInside(PlayerLocations[PlyrIdx]))
{
// If one is close enough, that's all it takes!
bCloseEnough = true;
break;
}
}
if (bCloseEnough == true)
{
bIgnoreAllCollision = false;
}
}
CollisionInstPayload->CurrentLODBoundsCheckCount++;
// Every 30 frames recheck the overall bounds...
if (CollisionInstPayload->CurrentLODBoundsCheckCount > 30)
{
CollisionInstPayload->CurrentLODBoundsCheckCount = 0;
}
}
}
}
if (bIgnoreAllCollision == true)
{
// Turn off collision on *all* existing particles...
// We don't want it to turn back on and have particles
// already embedded start performing collision checks.
BEGIN_UPDATE_LOOP;
{
Particle.Flags |= STATE_Particle_IgnoreCollisions;
}
END_UPDATE_LOOP;
return;
}
// Square the LODDistanceFactor values now, so we don't have to do it
// per particle in the update loop below...
for (int32 SquareIdx = 0; SquareIdx < PlayerLocations.Num(); SquareIdx++)
{
PlayerLODDistanceFactor[SquareIdx] *= PlayerLODDistanceFactor[SquareIdx];
}
}
float SquaredMaxCollisionDistance = FMath::Square(MaxCollisionDistance);
BEGIN_UPDATE_LOOP;
{
if ((Particle.Flags & STATE_Particle_CollisionIgnoreCheck) != 0)
{
CONTINUE_UPDATE_LOOP;
}
PARTICLE_ELEMENT(FParticleCollisionPayload, CollisionPayload);
if ((Particle.Flags & STATE_Particle_DelayCollisions) != 0)
{
if (CollisionPayload.Delay > Particle.RelativeTime)
{
CONTINUE_UPDATE_LOOP;
}
Particle.Flags &= ~STATE_Particle_DelayCollisions;
}
FVector Location;
FVector OldLocation;
// Location won't be calculated till after tick so we need to calculate an intermediate one here.
Location = Particle.Location + Particle.Velocity * DeltaTime;
if (LODLevel->RequiredModule->bUseLocalSpace)
{
// Transform the location and old location into world space
Location = OwnerTM.TransformPosition(Location);
OldLocation = OwnerTM.TransformPosition(Particle.OldLocation);
}
else
{
OldLocation = Particle.OldLocation;
}
FVector Direction = (Location - OldLocation).GetSafeNormal();
// Determine the size
FVector Size = Particle.Size * ParentScale;
FVector Extent(0.0f);
// Setup extent for mesh particles.
UParticleModuleTypeDataMesh* MeshType = Cast<UParticleModuleTypeDataMesh>(LODLevel->TypeDataModule);
if (MeshType && MeshType->Mesh)
{
Extent = MeshType->Mesh->GetBounds().BoxExtent;
Extent = MeshType->bCollisionsConsiderPartilceSize ? Extent * Size : Extent;
}
FHitResult Hit;
Hit.Normal.X = 0.0f;
Hit.Normal.Y = 0.0f;
Hit.Normal.Z = 0.0f;
check( Owner->Component );
FVector End = Location + Direction * Size / DirScalar;
if ((World->IsGameWorld() == true) && (MaxCollisionDistance < WORLD_MAX))
{
// LOD collision by distance
bool bCloseEnough = false;
for (int32 CheckIdx = 0; CheckIdx < PlayerCount; CheckIdx++)
{
float CheckValue = (PlayerLocations[CheckIdx] - End).SizeSquared() * PlayerLODDistanceFactor[CheckIdx];
if (CheckValue < SquaredMaxCollisionDistance)
{
bCloseEnough = true;
break;
}
}
if (bCloseEnough == false)
{
Particle.Flags |= STATE_Particle_IgnoreCollisions;
CONTINUE_UPDATE_LOOP;
}
}
AActor* IgnoreActor = bIgnoreSourceActor ? Actor : NULL;
if (PerformCollisionCheck(Owner, &Particle, Hit, IgnoreActor, End, OldLocation, Extent))
{
bool bDecrementMaxCount = true;
bool bIgnoreCollision = false;
if (Hit.GetActor())
{
bDecrementMaxCount = !bPawnsDoNotDecrementCount || !Cast<APawn>(Hit.GetActor());
bIgnoreCollision = bIgnoreTriggerVolumes && Hit.GetActor()->IsA(ATriggerBase::StaticClass());
//@todo.SAS. Allow for PSys to say what it wants to collide w/?
}
if (bIgnoreCollision == false)
{
if (bDecrementMaxCount && (bOnlyVerticalNormalsDecrementCount == true))
{
if ((Hit.Normal.IsNearlyZero() == false) && (FMath::Abs(Hit.Normal.Z) + VerticalFudgeFactor) < 1.0f)
{
//UE_LOG(LogParticles, Log, TEXT("Particle from %s had a non-vertical hit!"), *(Owner->Component->Template->GetPathName()));
bDecrementMaxCount = false;
}
}
if (bDecrementMaxCount)
{
CollisionPayload.UsedCollisions--;
}
if (CollisionPayload.UsedCollisions > 0)
{
if (LODLevel->RequiredModule->bUseLocalSpace)
{
// Transform the particle velocity to world space
FVector OldVelocity = OwnerTM.TransformVector(Particle.Velocity);
FVector BaseVelocity = OwnerTM.TransformVector(Particle.BaseVelocity);
BaseVelocity = BaseVelocity.MirrorByVector(Hit.Normal) * CollisionPayload.UsedDampingFactor;
Particle.BaseVelocity = OwnerTM.InverseTransformVector(BaseVelocity);
Particle.BaseRotationRate = Particle.BaseRotationRate * CollisionPayload.UsedDampingFactorRotation.X;
if (bMeshRotationActive && MeshRotationOffset > 0)
{
FMeshRotationPayloadData* PayloadData = (FMeshRotationPayloadData*)((uint8*)&Particle + MeshRotationOffset);
PayloadData->RotationRateBase *= CollisionPayload.UsedDampingFactorRotation;
}
// Reset the current velocity and manually adjust location to bounce off based on normal and time of collision.
FVector NewVelocity = Direction.MirrorByVector(Hit.Normal) * (Location - OldLocation).Size() * CollisionPayload.UsedDampingFactor;
Particle.Velocity = FVector::ZeroVector;
// New location
FVector NewLocation = Location + NewVelocity * (1.f - Hit.Time);
Particle.Location = OwnerTM.InverseTransformPosition(NewLocation);
if (bApplyPhysics)
{
check(IsInGameThread());
UPrimitiveComponent* PrimitiveComponent = Hit.Component.Get();
if(PrimitiveComponent && PrimitiveComponent->IsAnySimulatingPhysics())
{
FVector vImpulse;
vImpulse = -(NewVelocity - OldVelocity) * ParticleMass.GetValue(Particle.RelativeTime, Owner->Component);
PrimitiveComponent->AddImpulseAtLocation(vImpulse, Hit.Location, Hit.BoneName);
}
}
}
else
{
FVector vOldVelocity = Particle.Velocity;
// Reflect base velocity and apply damping factor.
Particle.BaseVelocity = Particle.BaseVelocity.MirrorByVector(Hit.Normal) * CollisionPayload.UsedDampingFactor;
Particle.BaseRotationRate = Particle.BaseRotationRate * CollisionPayload.UsedDampingFactorRotation.X;
if (bMeshRotationActive && MeshRotationOffset > 0)
{
FMeshRotationPayloadData* PayloadData = (FMeshRotationPayloadData*)((uint8*)&Particle + MeshRotationOffset);
PayloadData->RotationRateBase *= CollisionPayload.UsedDampingFactorRotation;
}
// Reset the current velocity and manually adjust location to bounce off based on normal and time of collision.
FVector vNewVelocity = Direction.MirrorByVector(Hit.Normal) * (Location - OldLocation).Size() * CollisionPayload.UsedDampingFactor;
Particle.Velocity = FVector::ZeroVector;
Particle.Location += vNewVelocity * (1.f - Hit.Time);
if (bApplyPhysics)
{
check(IsInGameThread());
UPrimitiveComponent* PrimitiveComponent = Hit.Component.Get();
if(PrimitiveComponent && PrimitiveComponent->IsAnySimulatingPhysics())
{
FVector vImpulse;
vImpulse = -(vNewVelocity - vOldVelocity) * ParticleMass.GetValue(Particle.RelativeTime, Owner->Component);
PrimitiveComponent->AddImpulseAtLocation(vImpulse, Hit.Location, Hit.BoneName);
}
}
}
if (EventPayload && (EventPayload->bCollisionEventsPresent == true))
{
LODLevel->EventGenerator->HandleParticleCollision(Owner, EventPayload, &CollisionPayload, &Hit, &Particle, Direction);
}
}
else
{
if (LODLevel->RequiredModule->bUseLocalSpace == true)
{
Size = OwnerTM.TransformVector(Size);
}
Particle.Location = Hit.Location + (Size / 2.0f);
if (LODLevel->RequiredModule->bUseLocalSpace == true)
{
// We need to transform the location back relative to the PSys.
// NOTE: LocalSpace makes sense only for stationary emitters that use collision.
Particle.Location = OwnerTM.InverseTransformPosition(Particle.Location);
}
switch (CollisionCompletionOption)
{
case EPCC_Kill:
{
if (EventPayload && (EventPayload->bDeathEventsPresent == true))
{
LODLevel->EventGenerator->HandleParticleKilled(Owner, EventPayload, &Particle);
}
KILL_CURRENT_PARTICLE;
}
break;
case EPCC_Freeze:
{
Particle.Flags |= STATE_Particle_Freeze;
}
break;
case EPCC_HaltCollisions:
{
Particle.Flags |= STATE_Particle_IgnoreCollisions;
}
break;
case EPCC_FreezeTranslation:
{
Particle.Flags |= STATE_Particle_FreezeTranslation;
}
break;
case EPCC_FreezeRotation:
{
Particle.Flags |= STATE_Particle_FreezeRotation;
}
break;
case EPCC_FreezeMovement:
{
Particle.Flags |= STATE_Particle_FreezeRotation;
Particle.Flags |= STATE_Particle_FreezeTranslation;
}
break;
}
if (EventPayload && (EventPayload->bCollisionEventsPresent == true))
{
LODLevel->EventGenerator->HandleParticleCollision(Owner, EventPayload, &CollisionPayload, &Hit, &Particle, Direction);
}
}
Particle.Flags |= STATE_Particle_CollisionHasOccurred;
}
}
}
END_UPDATE_LOOP;
}