[vtkusers] Is there a way to tell if a video card supports depth peeling?

[Doug Hoppes]

Hi all,

                I'm still playing with making my transparent objects look good.  It was suggested that I look at the depth peeling versus vtkdepthsortpolydata (since the depth sort isn't all that fast).  Of course, I read that the depth peeling isn't fast, either.

                From the documentation, I have implemented (where the actor is a set ofspheres)
-------
            m_pRenderWindow->SetAlphaBitPlanes(1);
            m_pRenderWindow->SetMultiSamples(0);
            m_pRenderer->GetActorRenderer()->UseDepthPeelingOn();
            m_pRenderer->GetActorRenderer()->SetMaximumNumberOfPeels(100);
            m_pRenderer->GetActorRenderer()->SetOcclusionRatio(0.1);

            vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
            mapper->SetInputConnection(appendData->GetOutputPort());
            vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
            actor->SetMapper(mapper);
            actor->GetProperty()->SetOpacity(0.5);
            actor->GetProperty()->SetColor(1, 0, 0);
            actor->RotateX(-72); //put the object in a position where it is easy
            m_pRenderer->AddActor(actor);

int depthPeelingWasUsed = m_pRenderer->GetActorRenderer()->GetLastRenderingUsedDepthPeeling();
-------

                The depthPeelingWasUsed always returns false (0).  From the documentation, it says that, for depth peeling, you really need OpenGL > 1.3.  I'm using the amd radeon 7900.

Doug
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