[vtkusers] Updating part of pipepline

[Slash1985]

Hello

I'm trying to connect Qt library (some sliders) to pipeline in QVTKWidget at
present. 
The goal is to set new object's opacity by QSlider.

What methods I have to process in pipeline except: 
this->propertyStent->SetOpacity(new_value);  ?

My pipeline looks like this right now:

vtkStructuredPointsReader -> vtkContourFilter -> vtkCleanPolyData ->
vtkPolyDataNormals -> vtkOutlineFilter -> vtkPolyDataMapper -> vtkActor


Here is some code from my project:

	this->actorStent = vtkActor::New();
	this->actorStent->SetMapper(this->polyMapperStent);
	
	this->propertyStent = this->actorStent->GetProperty();
	this->propertyStent->SetOpacity(1.0);  
	this->propertyStent->SetAmbientColor(0.8, 0.8, 0.8);
	this->propertyStent->SetSpecularColor(0.8, 0.8, 0.8);
	this->propertyStent->SetSpecular(0.6);
	this->propertyStent->SetAmbient(0.1);
	this->propertyStent->LightingOn();

Cheers
Tom
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