How can I check if something is STILL WITHIN a trigger volume?

Development Programming & Scripting
13

You can get voulme BSP information and check manually against the point, but it is possible only in C++ as I know.

bool AMyVolume::IsPositionInside(const FVector& Position) const
{
	bool bFallback = false;

#if WITH_EDITOR
	if (ABrush::NeedsRebuild())
	{
		// Fallback to the collision tests when there is no valid model
		UE_LOG(WaterMeshRuntime, Log, TEXT("Level BSP needs to rebuild."));
		bFallback = true;
	}
#endif

	if (Brush == nullptr) {
		// Fallback to the collision tests when there is no valid model
		bFallback = true;
	}

	if (bFallback) {
		UWorld* CurrentWorld = GetWorld();
		return CurrentWorld ? CurrentWorld->OverlapAnyTestByChannel(Position, FQuat::Identity, ECollisionChannel::ECC_OverlapAll_Deprecated, FCollisionShape::MakeSphere(0.01f)) : false;
	}

	// Use volume bsp here

	int32 nodeIx = 0;
	const FBspNode* node = Brush->Nodes.GetData();
	const FVector InnerPosition = GetTransform().InverseTransformPosition(Position);

	while (node != nullptr)
	{
		// Check if point is in front of plane
		if (node->Plane.PlaneDot(InnerPosition) > 0.0f)
		{
			// FRONT
			if (node->iFront != INDEX_NONE)
			{
				node = &Brush->Nodes[node->iFront];
			} else {
				return !node->ChildOutside(1, Brush->RootOutside);
			}
		} else {
			// BACK
			if (node->iBack != INDEX_NONE) // If there is a child, recurse into it.
			{
				node = &Brush->Nodes[node->iBack];
			} else {
				return !node->ChildOutside(0, Brush->RootOutside);
			}
		}
	}

	return !Brush->RootOutside;
}

works fine.

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