[vtkusers] Actor disappears when using one direction interactor style.

[alican]

I am trying to limit actor's movement to one direction only.
The question was already asked a couple of times and never answered.
It initially looked straightforward, however I cannot make it work. 
When I start moving the mouse an actor is disappearing and for the life of
me I do not know why.
Can somebody please spot a problem?
Thank you 
AC

void MoveInteractorStyle::OnMouseMove()
{
	if (m_Move && m_pActor)
	{
		int* pos = GetInteractor()->GetEventPosition();

		if (CommonUtils::isEmpty(m_CurrentPos))
		{
			m_CurrentPos = QVector3D(pos[0], pos[1], pos[2]);
			return;
		}
		QVector3D newPos(pos[0], pos[1], pos[2]);

		if (m_direction == X)
			m_pActor->SetPosition(newPos[0], m_CurrentPos[1], m_CurrentPos[2]);
		else if (m_direction == Y)
			m_pActor->SetPosition(m_CurrentPos[0], newPos[1], m_CurrentPos[2]);
		else if (m_direction == Z)
			m_pActor->SetPosition(m_CurrentPos[0], m_CurrentPos[1], newPos[2]);
		else
			m_pActor->SetPosition(newPos[0], newPos[1], newPos[2]);

		double* apos = m_pActor->GetPosition();
		qDebug() << "x " << apos[0] << " y " << apos[1] << " z " << apos[2];
		Pan();

		//vtkInteractorStyleTrackballActor::OnMouseMove();
	}
	else
		vtkInteractorStyleTrackballActor::OnMouseMove();
}


void MoveInteractorStyle::OnLeftButtonUp()
{

	m_Move = false;
	m_pActor = nullptr;
	CommonUtils::empty(m_CurrentPos);
	//vtkInteractorStyleTrackballActor::OnLeftButtonUp();
	EndPan();
}

void MoveInteractorStyle::OnLeftButtonDown()
{
	m_direction = X;
	m_Move = true;
	m_pActor = pickActor();
	StartPan();
}

vtkActor* MoveInteractorStyle::pickActor()
{
	int* clickPos = GetInteractor()->GetEventPosition();

	// Pick from this location.
	vtkSmartPointer<vtkPropPicker>  picker =
vtkSmartPointer<vtkPropPicker>::New();
	picker->Pick(clickPos[0], clickPos[1], 0, this->GetDefaultRenderer());

	double* pos = picker->GetPickPosition();
	return picker->GetActor();
}



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