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

[Aashish Chaudhary]

Please have a look here:

http://www.vtk.org/Wiki/VTK/Depth_Peeling

Specially this section:
Required OpenGL extensions


   - GL_ARB_depth_texture or OpenGL>=1.4
   - GL_ARB_shadow or OpenGL>=1.4
   - GL_EXT_shadow_funcs or OpenGL>=1.5
   - GL_ARB_vertex_shader or OpenGL>=2.0
   - GL_ARB_fragment_shader or OpenGL>=2.0
   - GL_ARB_shader_objects or OpenGL>=2.0
   - GL_ARB_occlusion_query or OpenGL>=1.5
   - GL_ARB_multitexture or OpenGL>=1.3
   - GL_ARB_texture_rectangle
   - GL_SGIS_texture_edge_clamp or GL_EXT_texture_edge_clamp or OpenGL>=1.2





On Mon, Dec 2, 2013 at 8:37 AM, Doug Hoppes <dhoppes at mbfbioscience.com>wrote:

>  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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-- 
| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com
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