[vtkusers] Volume Rendering and zbuffer

[Priya Vashistha]

Hello Everyone,

I an new to VTK and have been trying to install it since past two weeks and
haven't had any success. I am trying to install VTK7.0 using cmake and
intend to use it with Visual Studio Express 2015. My OS is win10.
I do not see any errors when i build the VTK binaries using Cmake and build
the vtk.sln. But, when I built the "INSTALL" project in vtk(which is
supposed to install VTK in program files) it gives me me the following
error:

Severity Code Description Project File Line Suppression State
Error MSB3073 The command "setlocal
"C:\Program Files\CMake\bin\cmake.exe" -DBUILD_TYPE=Debug -P
cmake_install.cmake
if %errorlevel% neq 0 goto :cmEnd
:cmEnd
endlocal & call :cmErrorLevel %errorlevel% & goto :cmDone
:cmErrorLevel
exit /b %1
:cmDone
if %errorlevel% neq 0 goto :VCEnd
:VCEnd" exited with code 1. INSTALL C:\Program Files
(x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.CppCommon.targets 133

I don't know what to do at this point. Any help will be greatly appreciated.

Thank You

On Thu, Oct 6, 2016 at 11:48 AM, Steve Petruzza <steve.petruzza at gmail.com>
wrote:

> Thank you Aashish,
>
> I tried to use the “vtkOpenGLGPUVolumeRayCastMapper” as following:
>
> —————————————
>
> vtkSmartPointer<vtkOpenGLGPUVolumeRayCastMapper> mapper
> =  vtkSmartPointer<vtkOpenGLGPUVolumeRayCastMapper>::New();
>
> mapper->RenderToImageOn();
> mapper->SetBlendModeToComposite();
>
> vtkSmartPointer<vtkVolume> volumep =  vtkSmartPointer<vtkVolume>::New();
> volumep->SetMapper(mapper);
>
> renderer->AddVolume(volumep);
>
> // rendering and camera settings…
>
>   renderWindow->SetOffScreenRendering( 1 );
>   renderWindow->Render();
>
> vtkSmartPointer<vtkImageData> depthImage = vtkSmartPointer<vtkImageData>:
> :New();
> vtkSmartPointer<vtkImageData> colorImage = vtkSmartPointer<vtkImageData>:
> :New();
>
>   mapper->GetDepthImage(depthImage);
>   mapper->GetColorImage(colorImage);
>
> —————————————
>
> The depthImage has type unsigned char, and I noticed that it contains only
> values 255 or 0 (for the background), nothing in between.
> I was expecting a gradient of values, generally floats or even normalized
> to char.
>
> What am I missing?
>
> Thank you,
> Steve
>
>
>
>
> On 04 Oct 2016, at 19:48, Aashish Chaudhary <aashish.chaudhary at kitware.com>
> wrote:
>
> Hi Steve,
>
> If you intend to get the depth values from volume (and not just geometry),
> then not clearing the depth buffer will not help either since we don't
> write to depth buffer (the defaults won't make sense anyways). If you are
> looking for depth values from both volume and geometry, then you may want
> to look into this option RenderToImage in the base class (
> https://github.com/Kitware/VTK/blob/master/Rendering/Volume/
> vtkGPUVolumeRayCastMapper.h). Give it a try and let us know if that works
> for you. If you enable this option then you can call GetColorImage and
> GetDepthImage for the depth values.
>
> Thanks,
>
>
> On Tue, Oct 4, 2016 at 12:34 PM Aashish Chaudhary <
> aashish.chaudhary at kitware.com> wrote:
>
>> That is because we make a call to clear the depth buffer bit  that is:
>> glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT). I have to think all of
>> the use-cases but I think we don't need to clear the depth buffer. We can
>> push a simple fix for it on the master branch.
>>
>> - Aashish
>>
>>
>>
>>
>> On Tue, Oct 4, 2016 at 12:12 PM stevep <steve.petruzza at gmail.com> wrote:
>>
>> Hi all,
>>
>> I used the vtkPolyDataMapper to render a surface and then with the
>> vtkRenderWindow I can get correctly the ZBuffer using GetZbufferData and
>> the
>> RGB data via vtkWindowToImageFilter.
>>
>> When I use, starting from the same vtkImageData, a volume rendering like
>> the
>> SmartVolumeMapper (as in the following):
>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/VolumeRendering/
>> SmartVolumeMapper
>>
>> The RGB data are correct but the ZBuffer contains all values == 1 (checked
>> dumping the float array to disk).
>>
>> I get the same result changing blend mode and using a
>> vtkFixedPointVolumeRayCastMapper.
>>
>> What am I missing?
>>
>> Thank you
>>
>>
>>
>>
>>
>> --
>> View this message in context: http://vtk.1045678.n5.nabble.
>> com/Volume-Rendering-and-zbuffer-tp5740662.html
>> Sent from the VTK - Users mailing list archive at Nabble.com
>> <http://nabble.com>.
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>
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