QML and Qt Quick

@J-Hilk By groping I found that the QtQuick I need to use with my setup was 2.3, but thanks for explain me the difference between versions

@aim0d On what OS? You can download installer from here: https://download.qt.io/archive/qt/5.14/

For the purpouse of people who might search for an find this forum post, I put in a request with QT support and received the following. Hi Joe, Thank you for contacting Qt Support and for providing your sample project. There are 2 broad ways to specify the fragmentShader property, depending on which version of Qt you want to target: The Qt 5 way is to specify the shader's source code as a string. The Qt 6 way is to pre-compile your shader source code into a .qsb file, and specify a URL to that .qsb file See: https://doc.qt.io/qt-5/qml-qtquick-shadereffect.html#fragmentShader-prop https://doc.qt.io/qt-6/qml-qtquick-shadereffect.html#fragmentShader-prop To do it the Qt 5 way, the easiest approach is to copy the contents of your .frag file and paste it as a string literal (surrounded by quotation marks) to the RHS of the "fragmentShader" property. To do it the Qt 6 way, run the QSB tool to compile your shader source code. Unfortunately, the code of colour_wheel.frag is too old to be supported by QSB (for example, the "varying" keyword was deprecated long ago, and even removed for ES profiles) See: https://doc.qt.io/qt-6/qtshadertools-overview.html https://doc.qt.io/qt-6/qtshadertools-qsb.html I hope this helps.

https://youtu.be/1EkU5dvygno?t=2983

mesh: Scatter3DSeries.MeshMinimal mesh: Scatter3DSeries.MeshPoint

@jcdelve said in engine.rootContext()->setContextProperty is failing to add property: Interesting. By all other conventions of coding standards, it's bad practice to have a variable directly accessible like that... Is there a reason QT/QML prefers that over doing an invokable getter? Please read up on how Q_PROPERTY system works. You are not accessing a variable, you are accessing a property. QML (via Meta Object System) will use the getter / setter you provide in Q_PROPERTY declaration. It will not access the variable directly.

Not is same problem. But I have try Delete build folder and problem is solved (i have read into post). Thanks

QTimer::singleShot(0, this, [=] { doTheScreenshot(); }); should do it.

In main.cpp need add qputenv("QSG_RHI_BACKEND", "opengl"); more code: #include <QtDataVisualization/qutils.h> //! [2] #include <QtGui/QGuiApplication> #include <QtCore/QDir> #include <QtQml/QQmlContext> #include <QtQuick/QQuickView> #include <QtQml/QQmlEngine> int main(int argc, char *argv[]) { qputenv("QSG_RHI_BACKEND", "opengl");

Just like in official tutorial with custom point cloud #include "heightmapgeometry.h" HeightMapGeometry::HeightMapGeometry() { m_pFrameTimer = new QTimer(this); connect(m_pFrameTimer, &QTimer::timeout, this, &HeightMapGeometry::m_update); m_pFrameTimer->start(120); m_generateTestMatrix(); m_updateGeometry(); } void HeightMapGeometry::m_updateGeometry() { clear(); int stride = 3 * sizeof(float); QByteArray vertexData(3 * stride, Qt::Initialization::Uninitialized); vertexData.resize(stride * (MATRIX_SIZE * MATRIX_SIZE * 2)); float *p = reinterpret_cast<float *>(vertexData.data()); for (int y = 0; y < MATRIX_SIZE; ++y) { for (int x = 0; x < MATRIX_SIZE; ++x) { QVector3D vertex(x * MATRIX_SCALE, y * MATRIX_SCALE, m_testMatrix[x][y] * MATRIX_SCALE); *p++ = vertex.x(); *p++ = vertex.y(); *p++ = vertex.z(); vertex.setY((y + 1) * MATRIX_SCALE); vertex.setZ(m_testMatrix[x][y + 1] * MATRIX_SCALE); *p++ = vertex.x(); *p++ = vertex.y(); *p++ = vertex.z(); } } setVertexData(vertexData); setPrimitiveType(QQuick3DGeometry::PrimitiveType::LineStrip); setStride(stride); addAttribute(QQuick3DGeometry::Attribute::PositionSemantic, 0, QQuick3DGeometry::Attribute::F32Type); } float HeightMapGeometry::m_generateTestMatrix() { for (int i = 0; i < MATRIX_SIZE; ++i) { for (int j = 0; j < MATRIX_SIZE; ++j) { float num = QRandomGenerator::global()->generateDouble() * (1.f - 0.f) + 0.f; m_testMatrix[i][j] = num; } } } void HeightMapGeometry::m_update() { m_generateTestMatrix(); m_updateGeometry(); update(); }

@GrecKo said in DoubleValidator strange behavior: locale: "en" Thanks so much, this was indeed the problem! I suspected something like this at some point, and tried using a comma as a separator, but this wasn't accepted due to me using the parseFloat function somewhere in my code, which I mistakenly took as validation that commas weren't the right separator in the DoubleValidator.

Thank you all

Got the loctaion module to install with the dev branch, though think it would also install with the 6.3 Error. One has to load Location's CMake file into QtCreator and under the run configurations there are man y things one must check on to build plugins (Location Plugin, OSM, MapBox, etc) Only one example worked out of the box and that was the MinimalMap as the other examples used a lot of QtQuickControls from 1.x and those weren't working yet with Qt 6.4 snapshot, or maybe I just didn't download them.