Hi any chance you could try a more recent version? Lots of fixes since then…
Mike
> On 9 Jan 2019, at 10:59, Volker Enderlein <volker.enderl...@ifm-chemnitz.de>
> wrote:
>
> Hi,
>
>
>
> I am facing some rendering issues with custom effects in Qt3d. To mark some
> of the entities selected I replace the existing material effect of an entity
> with a newly created instance of a wireframe effect. When using the
> robustwireframe shaders sometimes (but not always, it does not seem to be
> reproducible) on some entities the underlying color (phong shading model) is
> not set properly.
>
> I tried different shaders (also tried to set the fragment color directly) but
> the result does not change: sometimes I see those rendering issues.
>
> And in some cases the following message is written to the console:
>
> QPainter::begin: Paint device returned engine == 0, type: 3
> QPainter::setCompositionMode: Painter not active
> QPainter::end: Painter not active, aborted
>
> So I'm guessing, setting the custom QEffect causes some issues.
>
> My question is: Should I avoid creating many instances of a custom wireframe
> effect and reuse one instance for all selected entities or should I create a
> separate instance for every entity (material)?
>
> <RenderingIssues.PNG>
>
> The left part of the image shows the wrong behaviour, the right part is the
> expected rendering.
>
> Platform specs: Windows 7 x64, Visual Studio 2015, Qt 5.10.0, Qt3D
>
> Graphics specs: NVidia GeForce GTX 750 Ti/PCIe/SSE2, OpenGL 4.6.0 NVIDIA
> 391.35
>
>
>
> The definition of the effect is as follows:
>
>
>
> WireFrameEffect::WireFrameEffect(Qt3DCore::QNode* parent/* = nullptr*/)
> : Qt3DRender::QEffect(parent)
> {
> addParameter(new Qt3DRender::QParameter(QStringLiteral("ka"),
> QVector4D(0.1f, 0.1f, 0.1f, 1.0f)));
> addParameter(new Qt3DRender::QParameter(QStringLiteral("kd"),
> QVector4D(0.7f, 0.7f, 0.7f, 1.0f)));
> addParameter(new Qt3DRender::QParameter(QStringLiteral("ks"),
> QVector4D(0.95f, 0.95f, 0.95f, 1.0f)));
> addParameter(new Qt3DRender::QParameter(QStringLiteral("ke"),
> QVector4D(0.0f, 0.0f, 0.0f, 1.0f)));
> addParameter(new Qt3DRender::QParameter(QStringLiteral("shininess"),
> 128.0f));
>
> addParameter(new
> Qt3DRender::QParameter(QStringLiteral("light.position"), QVector4D(0.0f,
> 0.0f, 0.0f, 1.0f)));
> addParameter(new
> Qt3DRender::QParameter(QStringLiteral("light.intensity"), QVector3D(1.0f,
> 1.0f, 1.0f)));
> addParameter(new Qt3DRender::QParameter(QStringLiteral("line.width"),
> 1.0f));
> addParameter(new Qt3DRender::QParameter(QStringLiteral("line.color"),
> QVector4D(1.0f, 1.0f, 1.0f, 1.0f)));
>
> auto technique = new Qt3DRender::QTechnique;
> {
> auto graphicsApiFilter = technique->graphicsApiFilter();
>
> graphicsApiFilter->setApi(Qt3DRender::QGraphicsApiFilter::Api::OpenGL);
>
> graphicsApiFilter->setProfile(Qt3DRender::QGraphicsApiFilter::OpenGLProfile::CoreProfile);
> graphicsApiFilter->setMajorVersion(3);
> graphicsApiFilter->setMinorVersion(1);
>
> auto filterKey = new Qt3DRender::QFilterKey;
> filterKey->setName(QStringLiteral("renderingStyle"));
> filterKey->setValue(QStringLiteral("forward"));
> technique->addFilterKey(filterKey);
>
> auto renderPass = new Qt3DRender::QRenderPass;
> {
> auto shaderProgram = new Qt3DRender::QShaderProgram;
>
> shaderProgram->setVertexShaderCode(shaderProgram->loadSource(QUrl(QStringLiteral("qrc:/shaders/robustwireframe.vert"))));
>
> shaderProgram->setGeometryShaderCode(shaderProgram->loadSource(QUrl(QStringLiteral("qrc:/shaders/robustwireframe.geom"))));
>
> shaderProgram->setFragmentShaderCode(shaderProgram->loadSource(QUrl(QStringLiteral("qrc:/shaders/robustwireframe.frag"))));
> renderPass->setShaderProgram(shaderProgram);
> }
> technique->addRenderPass(renderPass);
> }
> addTechnique(technique);
> }
>
>
> Thanks in advance,
>
> Cheers Volker
>
> --
>
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--
Mike Krus | mike.k...@kdab.com | Senior Software Engineer
KDAB (UK) Ltd., a KDAB Group company
Tel: UK Office +44 1625 809908 Mobile +44 7833 491941
KDAB - The Qt Experts, C++, OpenGL Experts
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