bool UBillboardComponent::ComponentIsTouchingSelectionBox(const FBox& InSelBBox, const FEngineShowFlags& ShowFlags, const bool bConsiderOnlyBSP, const bool bMustEncompassEntireComponent) const
{
AActor* Actor = GetOwner();
if (!bConsiderOnlyBSP && ShowFlags.BillboardSprites && Sprite != nullptr && Actor != nullptr)
{
const float Scale = ComponentToWorld.GetMaximumAxisScale();
// Construct a box representing the sprite
const FBox SpriteBox(
Actor->GetActorLocation() - Scale * FMath::Max(Sprite->GetSizeX(), Sprite->GetSizeY()) * FVector(0.5f, 0.5f, 0.5f),
Actor->GetActorLocation() + Scale * FMath::Max(Sprite->GetSizeX(), Sprite->GetSizeY()) * FVector(0.5f, 0.5f, 0.5f));
// If the selection box doesn't have to encompass the entire component and it intersects with the box constructed for the sprite, then it is valid.
// Additionally, if the selection box does have to encompass the entire component and both the min and max vectors of the sprite box are inside the selection box,
// then it is valid.
if ((!bMustEncompassEntireComponent && InSelBBox.Intersect(SpriteBox))
|| (bMustEncompassEntireComponent && InSelBBox.IsInside(SpriteBox)))
{
return true;
}
}
return false;
}
void FVertexSnappingImpl::GetActorsInsideBox( const FBox& Box, UWorld* World, TArray<FSnapActor>& OutActorsInBox, const TSet< TWeakObjectPtr<AActor> >& ActorsToIgnore, const FSceneView* View )
{
for( FActorIterator It(World); It; ++It )
{
AActor* Actor = *It;
// Ignore the builder brush, hidden actors and forcefully ignored actors (actors being moved)
if( Actor != World->GetDefaultBrush() && It->IsHiddenEd() == false && !ActorsToIgnore.Contains( Actor ) )
{
const bool bNonColliding = true;
FBox ActorBoundingBox = Actor->GetComponentsBoundingBox(true);
// Actors must be within the bounding box and within the view frustum
if( Box.Intersect( ActorBoundingBox ) && View->ViewFrustum.IntersectBox( ActorBoundingBox.GetCenter(), ActorBoundingBox.GetExtent() ) )
{
OutActorsInBox.Add( FSnapActor( Actor, Box ) );
}
}
}
}