实现步骤

1. 设置动态生成导航，RecastNavMesh-->Runtime-->RuntimeGeneration=Dynamic;
2. 设置组件是否能影响导航，bCanEverAffectNavigation = true;
3. 设置CollisionEnabled 为QueryOnly或者QueryAndPhysics
4. 设置碰撞响应,设置Pawn或者Vehicle为block;

talk is cheap, show me the code.

void UPrimitiveComponent::SetCollisionResponseToChannel(ECollisionChannel Channel, ECollisionResponse NewResponse)
{
	BodyInstance.SetResponseToChannel(Channel, NewResponse);
	OnComponentCollisionSettingsChanged();
}

void UPrimitiveComponent::OnComponentCollisionSettingsChanged()
{
	if (IsRegistered() && !IsTemplate())			// not for CDOs
	{
		// changing collision settings could affect touching status, need to update
		if (IsQueryCollisionEnabled())	//if we have query collision we may now care about overlaps so clear cache
		{
			ClearSkipUpdateOverlaps();
		}

		UpdateOverlaps();

		// update navigation data if needed
		const bool bNewNavRelevant = IsNavigationRelevant();
		if (bNavigationRelevant != bNewNavRelevant)
		{
			bNavigationRelevant = bNewNavRelevant;
			FNavigationSystem::UpdateComponentData(*this);
		}

		OnComponentCollisionSettingsChangedEvent.Broadcast(this);
	}
}

bool UPrimitiveComponent::IsNavigationRelevant() const 
{ 
	if (!CanEverAffectNavigation())
	{
		return false;
	}

	if (HasCustomNavigableGeometry() >= EHasCustomNavigableGeometry::EvenIfNotCollidable)
	{
		return true;
	}

	const FCollisionResponseContainer& ResponseToChannels = GetCollisionResponseToChannels();
	return IsQueryCollisionEnabled() &&
		(ResponseToChannels.GetResponse(ECC_Pawn) == ECR_Block || ResponseToChannels.GetResponse(ECC_Vehicle) == ECR_Block);
}

FORCEINLINE bool CollisionEnabledHasQuery(ECollisionEnabled::Type CollisionEnabled)
{
	return (CollisionEnabled == ECollisionEnabled::QueryOnly) ||
			(CollisionEnabled == ECollisionEnabled::QueryAndPhysics);
}

代码解释的非常清楚