[vtk-developers] Problem in VTK 8.2 with defaultFormat() and QVTKOpenGLWidget on Windows 10/Intel

[Elvis Stansvik]

(Sorry I forgot to post to Discourse!)

Den tis 21 maj 2019 kl 14:44 skrev Elvis Stansvik
<elvis.stansvik at orexplore.com>:
>
> Hi all,
>
> I'm in the process of porting our application to VTK 8.2.0, so
> switching to the new QVTKOpenGLWidget where possible (and staying with
> QVTKOpenGLNativeWidget where necessary).
>
> I'm struggling with a problem I'm seeing on Windows 10 / Intel
> graphics in the new QVTKOpenGLWidget.
>
> When we add some actors to the renderer during runtime and then call
> Render(), the rendering seems ineffective (nothing shows up) until the
> user resizes the widget a little (causing a second render). The
> problem can be "worked around" of course by simply issuing two
> successive Render() calls, but this is obviously an ugly workaround.
>
> The problem is not appearing on our Linux or macOS test machines, only
> on the Windows 10 machine (Intel graphics, though not sure that
> matters).
>
> I started digging around, and it seems the problem can also be "fixed"
> by using a OpenGL compatibility profile instead of core profile (which
> is what QVTKOpenGLWidget::defaultFormat() returns).
>
> So instead of
>
>   QSurfaceFormat::setDefaultFormat(QVTKOpenGLWidget::defaultFormat());
>
> if I do
>
>   auto format = QVTKOpenGLWidget::defaultFormat();
>   format.setProfile(QSurfaceFormat::CompatibilityProfile);
>   QSurfaceFormat::setDefaultFormat(format);
>
> that seems to "solve" the problem.
>
> Below is a minimal test case where I simply show a QVTKOpenGLWidget,
> and 2 seconds later I set the renderer background to red and call
> Render(). For me, the window will not turn red until I resize it a
> little (or if I uncomment either of the two commented lines).
>
> Has anyone seen this problem before?
>
> I have not tested with VTK master yet, and I know there has been some
> changes, but we would really like to stick to a released version
> (8.2.0).
>
> Versions used:
>
> - Windows 10
> - Intel UHD Graphics 620 (driver 24.20.100.6344)
> - VTK 8.2.0
> - Qt 5.12.3 (5.11.1 also tested)
>
> Many thanks in advance for any tips/advice.
>
> Elvis
>
> renderbug.cpp:
>
> #include <QApplication>
> #include <QSurfaceFormat>
> #include <QTimer>
> #include <QtDebug>
>
> #include <QVTKOpenGLWidget.h>
>
> #include <vtkGenericOpenGLRenderWindow.h>
> #include <vtkNew.h>
> #include <vtkRenderer.h>
>
> int main(int argc, char *argv[])
> {
>     auto format = QVTKOpenGLWidget::defaultFormat();
>     //format.setProfile(QSurfaceFormat::CompatibilityProfile);
>     QSurfaceFormat::setDefaultFormat(format);
>
>     QApplication app(argc, argv);
>
>     vtkNew<vtkRenderer> renderer;
>
>     vtkNew<vtkGenericOpenGLRenderWindow> window;
>     window->AddRenderer(renderer);
>
>     QVTKOpenGLWidget widget;
>     widget.SetRenderWindow(window);
>
>     QTimer::singleShot(2000, [&window, &renderer]() {
>         qDebug() << "Setting background to red and rendering";
>         renderer->SetBackground(1.0, 0.0, 0.0);
>         window->Render();
>         //window->Render();
>     });
>
>     widget.show();
>
>     return app.exec();
> }
>
> CMakeLists.txt:
>
> cmake_minimum_required(VERSION 3.5)
>
> project(renderbug)
>
> find_package(Qt5Widgets REQUIRED)
>
> find_package(VTK 8.2.0 REQUIRED COMPONENTS
>     vtkGUISupportQt
>     vtkInteractionStyle
>     vtkRenderingCore
>     vtkRenderingOpenGL2
> )
>
> add_executable(renderbug WIN32
>     renderbug.cpp
> )
>
> target_link_libraries(renderbug PRIVATE
>     Qt5::Widgets
>     vtkGUISupportQt
>     vtkInteractionStyle
>     vtkRenderingCore
>     vtkRenderingOpenGL2
> )
>
> target_include_directories(renderbug SYSTEM PRIVATE
>     ${VTK_INCLUDE_DIRS}
> )
>
> target_compile_definitions(renderbug PRIVATE
>     ${VTK_DEFINITIONS}
> )