[vtkusers] Rendering a large number of actors

[Ragnarok]

Simple example of the problem.

// Code to create the actors
        vtkSmartPointer<vtkActor> actorArray[10];
        vtkSmartPointer<vtkConeSource> coneSource =
		vtkSmartPointer<vtkConeSource>::New();

	coneSource ->Update();
	vtkSmartPointer<vtkPolyDataMapper> mapper =
		vtkSmartPointer<vtkPolyDataMapper>::New();
	mapper->SetInputConnection(arrowSource->GetOutputPort());
	vtkSmartPointer<vtkPropAssembly> propAssembly =
		vtkSmartPointer<vtkPropAssembly>::New();

       for (int i = 0; i < 1000; i++)
       {
               vtkSmartPointer<vtkActor>coneActor =
	              vtkSmartPointer<vtkActor>::New();
               coneActor ->SetMapper(mapper);
               
               actorArray[i] = coneActor ;

               propAssembly->AddPart(coneActor);
                
        }

// rendering stuff
...
    //if I do this, I get 5 fps
        renderer->AddViewProp(propAssembly);

    //if I do this, I get 30 fps
        for (int i = 0; i < 1000; i++)
       {
               renderer->AddActor(actorArray[i])   
        }
    
   // If I do this, I get 5 fps
        for (int i = 0; i < 1000; i++)
       {
               renderer->AddViewProp(actorArray[i])   
        }


How is it that the Addviewprop(propAssembly) is way slower than indivually
adding all the actors in my renderer? I thought the purpose of the
VtkpropAssembly was to group all elements to make the rendring speed way
faster.

Is there any other better way to gain speed?



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