[vtk-developers] Volume won't show on Win7/Intel HD4600 with QVTKOpenGLWidget in 8.0.0.rc1

[Sankhesh Jhaveri]

Hi Elvis,

Could you try downloading the ParaView nightly binary
<http://www.paraview.org/download/> and test volume rendering there? You
can use the wavelet source for a test dataset. ParaView uses the
QVTKOpenGLWidget and it would be a good test before diving into the code.

Thanks,
Sankhesh
​

On Tue, May 23, 2017 at 6:50 AM Elvis Stansvik <elvis.stansvik at orexplore.com>
wrote:

> Hi all,
>
> In porting to QVTKOpenGLWidget, I can't get volumes rendered using
> vtkGPUVolumeRayCastMapper to show up on Windows 7, Intel graphics (HD
> 4600). They show up fine on Linux. They also show up fine on Windows 7
> if using a plain VTK render window. I've tried turning off
> multisampling with setSamples(0) on the default QSurfaceFormat.
>
> The below test case illustrates the issue. See the attached
> screenshots from running "TestCase" (left) and "TestCase 1" (right).
> The former uses a plain render window while the latter uses the new
> QVTKOpenGLWidget. Notice how in the Windows 7 screenshot, the plain
> VTK rendering works fine, but the QVTKOpenGLWidget one is not showing
> the volume.
>
> Versions used:
>
> Kubuntu Linux 16.04
> VTK 8.0.0.rc1, OpenGL2
> Qt 5.5.1
>
> Windows 7
> VTK 8.0.0.rc1, OpenGL2
> Qt 5.6.2
>
> Any ideas what the problem might be?
>
> I can provide a standalone .zip distribution of my build of the test
> case if you want.
>
> Note that this issue is orthogonal to the alpha issue I reported and
> got solved in my other thread.
>
> Many thanks in advance,
> Elvis
>
>
> main.cpp:
>
> #include <algorithm>
>
> #include <vtkColorTransferFunction.h>
> #include <vtkGenericOpenGLRenderWindow.h>
> #include <vtkGPUVolumeRayCastMapper.h>
> #include <vtkImageData.h>
> #include <vtkNew.h>
> #include <vtkPiecewiseFunction.h>
> #include <vtkProperty.h>
> #include <vtkRenderer.h>
> #include <vtkRenderWindow.h>
> #include <vtkRenderWindowInteractor.h>
> #include <vtkVolume.h>
> #include <vtkVolumeProperty.h>
>
> #include <QVTKOpenGLWidget.h>
>
> #include <QApplication>
>
> int main(int argc, char *argv[])
> {
>     auto defaultFormat = QVTKOpenGLWidget::defaultFormat();
>     defaultFormat.setSamples(0);
>     QSurfaceFormat::setDefaultFormat(defaultFormat);
>
>     QApplication app(argc, argv);
>
>     // Set up volume rendering
>     vtkNew<vtkColorTransferFunction> colorFunction;
>     colorFunction->AddRGBPoint(0.0, 0.0, 0.0, 0.0);
>     colorFunction->AddRGBPoint(1.0, 0.0, 0.0, 0.0);
>
>     vtkNew<vtkPiecewiseFunction> opacityFunction;
>     opacityFunction->AddPoint(0.0, 0.0);
>     opacityFunction->AddPoint(1.0, 1.0);
>
>     vtkNew<vtkImageData> imageData;
>     imageData->SetExtent(0, 200, 0, 200, 0, 200);
>     imageData->AllocateScalars(VTK_FLOAT, 1);
>     std::fill_n(static_cast<float *>(imageData->GetScalarPointer()),
> 8000000, 0.01);
>
>     vtkNew<vtkGPUVolumeRayCastMapper> volumeMapper;
>     volumeMapper->SetInputData(imageData.Get());
>
>     vtkNew<vtkVolumeProperty> volumeProperty;
>     volumeProperty->SetScalarOpacity(opacityFunction.Get());
>     volumeProperty->SetColor(colorFunction.Get());
>     volumeProperty->ShadeOff();
>
>     vtkNew<vtkVolume> volume;
>     volume->SetMapper(volumeMapper.Get());
>     volume->SetProperty(volumeProperty.Get());
>
>     vtkNew<vtkRenderer> renderer;
>     renderer->AddVolume(volume.Get());
>     renderer->SetBackground(1.0, 1.0, 1.0);
>
>     if (argc > 1) {
>         // Render with QVTKOpenGLWidget
>         vtkNew<vtkGenericOpenGLRenderWindow> window;
>         window->AddRenderer(renderer.Get());
>
>         auto widget = new QVTKOpenGLWidget();
>         widget->SetRenderWindow(window.Get());
>         widget->show();
>
>         return app.exec();
>     } else {
>         // Render with "plain" render window / interactor
>         vtkNew<vtkRenderWindow> window;
>         window->AddRenderer(renderer.Get());
>
>         vtkNew<vtkRenderWindowInteractor> interactor;
>         interactor->SetRenderWindow(window.Get());
>         interactor->Start();
>
>         return 0;
>     }
> }
>
>
> CMakeLists.txt:
>
> cmake_minimum_required(VERSION 3.1)
>
> project(TestCase)
>
> find_package(VTK 8.0 COMPONENTS
>     vtkCommonCore
>     vtkCommonDataModel
>     vtkCommonExecutionModel
>     vtkCommonMath
>     vtkFiltersSources
>     vtkGUISupportQt
>     vtkInteractionStyle
>     vtkRenderingCore
>     vtkRenderingOpenGL2
>     vtkRenderingVolume
>     vtkRenderingVolumeOpenGL2
>     REQUIRED
> )
>
> find_package(Qt5Widgets REQUIRED)
>
> add_executable(TestCase main.cpp)
>
> target_link_libraries(TestCase PUBLIC
>     vtkCommonCore
>     vtkCommonDataModel
>     vtkCommonExecutionModel
>     vtkCommonMath
>     vtkFiltersSources
>     vtkGUISupportQt
>     vtkInteractionStyle
>     vtkRenderingCore
>     vtkRenderingOpenGL2
>     vtkRenderingVolume
>     vtkRenderingVolumeOpenGL2
>     Qt5::Widgets
> )
>
> target_include_directories(TestCase PUBLIC
>     ${VTK_INCLUDE_DIRS}
> )
>
> target_compile_definitions(TestCase PUBLIC
>     ${VTK_DEFINITIONS}
> )
>
> set_target_properties(TestCase PROPERTIES
>     CXX_STANDARD 14
>     CXX_STANDARD_REQUIRED ON
> )
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> --
Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
<http://www.kitware.com/> | (518) 881-4417
​
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