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

[Burlen Loring]

Hi Doug,

> 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.
Nice card, that should support depth peeling without issue. However 
historically depth peeling has been disabled for ATI cards. We recently 
revisited the issue and were able to get dpeth peeling to work on ATI 
Radeon HD cards. This change is in VTK 6.1, so you'll have to upgrade 
and if you're already at 6.1 then it's a bug.

Burlen

On 12/2/2013 6:46 AM, Aashish Chaudhary wrote:
> 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 
> <mailto: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);
>
>     intdepthPeelingWasUsed =
>     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 <http://www.kitware.com>
>
>
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