[vtkusers] Depth peeling

[David E DeMarle]

> NVidia Quadro K300m under Windows.

hmmm, why would glGetIntegerv(GL_ALPHA_BITS, &alphaBits) would return 0?
Maybe the context isn't initialized correctly at this point in the program
somehow...

Thomas what does ctest -R Depth give you?







David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Mon, Nov 10, 2014 at 10:11 AM, Aashish Chaudhary <
aashish.chaudhary at kitware.com> wrote:

> What kind of graphics card / driver version / and OS you are using? Any
> information related to this would be useful.
>
> - Aashish
>
> On Mon, Nov 10, 2014 at 3:48 AM, Busse, Thomas (GE Oil & Gas) <
> Thomas.Busse at ge.com> wrote:
>
>>  Thanks a lot for help.
>>
>>
>>
>> I have put a breakpoint at vtkOpenGLRenderer.cxx:541
>>
>>
>>
>> The this->DepthPeelingIsSupported is 0.
>>
>> Digging a little bit deeper this is because :
>>
>>
>>
>>       GLint alphaBits;
>>
>>       glGetIntegerv(GL_ALPHA_BITS, &alphaBits);
>>
>>       int supportsAtLeast8AlphaBits=alphaBits>=8;
>>
>>
>>
>> alphaBits is 0.
>>
>>
>>
>> I have checked that all other conditions for
>>
>>       this->DepthPeelingIsSupported =
>>
>>         supports_depth_texture &&
>>
>>         supports_shadow &&
>>
>>         supports_blend_func_separate &&
>>
>>         supports_shadow_funcs &&
>>
>>         supports_vertex_shader &&
>>
>>         supports_fragment_shader &&
>>
>>         supports_shader_objects &&
>>
>>         supports_occlusion_query &&
>>
>>         supports_multitexture &&
>>
>>         supports_GL_ARB_texture_rectangle &&
>>
>>         supports_edge_clamp &&
>>
>>         supportsAtLeast8AlphaBits &&
>>
>>         driver_support;
>>
>>
>>
>> are true.
>>
>>
>>
>> Do I have some settings wrong so that alphaBits is 0? Or is it a problem
>> with my graphics card?
>>
>>
>>
>> Best Regards,
>>
>> Thomas
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> *From:* David E DeMarle [mailto:dave.demarle at kitware.com]
>> *Sent:* Freitag, 7. November 2014 18:00
>> *To:* Busse, Thomas (GE Oil & Gas)
>> *Cc:* vtkusers at vtk.org
>> *Subject:* Re: [vtkusers] Depth peeling
>>
>>
>>
>> There can be other conditions.
>>
>>
>>
>> Need to more details (or sit down with a debugger) to know for sure if
>> one of them is stopping you.
>>
>>
>>
>> Put a breakpoint at vtkOpenGLRenderer.cxx:541 to see if vtk thinks your
>> card can do depth peeling (or run one of the vtk depth peeling tests).
>>
>>
>>
>> Put a breakpoint at vtkRenderer.cxx:599 to see if vtk thinks that there
>> are translucent objects in your scene. The one has tripped me up before. If
>> it is for you and you happen to be rendering multi block data with block
>> opacity, try setting Mapper->SetScalarVisibilityOff to prevent the LUT from
>> deciding.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>   David E DeMarle
>> Kitware, Inc.
>> R&D Engineer
>> 21 Corporate Drive
>> Clifton Park, NY 12065-8662
>> Phone: 518-881-4909
>>
>>
>>
>> On Fri, Nov 7, 2014 at 9:24 AM, Busse, Thomas (GE Oil & Gas) <
>> Thomas.Busse at ge.com> wrote:
>>
>> Hi,
>>
>>
>>
>> I tried to get depth peeling working but without success until now.
>>
>>
>>
>> My setup is VTK6.1 and a NVidia Quadro K300m under Windows.
>>
>>
>>
>> Here is the code snippet of the initialization:
>>
>>
>>
>>   m_pVtkRenderWindow = pVtkMFCWindow->GetRenderWindow();
>>
>>   m_pVtkRenderWindow->Register(NULL);
>>
>>
>>
>>   m_pVtkRenderWindow->AddRenderer(m_pVtkRenderer);
>>
>>
>>
>>   // Use Depth Peeling for transparency
>>
>>   m_pVtkRenderWindow->SetAlphaBitPlanes(1);
>>
>>   m_pVtkRenderWindow->SetMultiSamples(0);
>>
>>   m_pVtkRenderer->SetUseDepthPeeling(1);
>>
>>   m_pVtkRenderer->SetMaximumNumberOfPeels(100);
>>
>>   m_pVtkRenderer->SetOcclusionRatio(0.1);
>>
>>
>>
>>
>>
>> but after rendering a call to
>>
>>   int depthPeelingWasUsed =
>> m_pVtkRenderer->GetLastRenderingUsedDepthPeeling();
>>
>> returns 0.
>>
>>
>>
>> Can someone help me on this?
>>
>> Is there some additional trick required to get it working?
>>
>>
>>
>> According specs the graphics card should fulfill all requirements.
>>
>>
>>
>> Best Regards,
>>
>> Thomas
>>
>>
>>
>>
>>
>>
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>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
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