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c++ - 如何使用 Qt3D 设置多个视口而无需使用 QML

问题描述

我想设置一个类似于https://doc.qt.io/archives/qt-5.10/qt3d-multiviewport-example.html的多视口场景， 而不必使用 QML。

目前我有一个单一的视图使用：

Qt3DExtras::Qt3DWindow* createView ( Qt3DCore::QEntity* rootEntity ) {

    Qt3DExtras::Qt3DWindow* view = new Qt3DExtras::Qt3DWindow();

    Qt3DRender::QCamera* camera = view->camera();
    camera->lens()->setPerspectiveProjection ( 45.0f, 16.0f / 9.0f, 0.1f, 1000.0f );
    camera->setPosition ( QVector3D ( 0, 0, 10.0f ) );
    camera->setViewCenter ( QVector3D ( 0, 0, 0 ) );

    Qt3DExtras::QOrbitCameraController* manipulator = new Qt3DExtras::QOrbitCameraController ( rootEntity );
    manipulator->setLinearSpeed ( 5.0f );
    manipulator->setLookSpeed ( 180.f );
    manipulator->setZoomInLimit ( 5.0f );
    manipulator->setCamera ( camera );

    return view;
}

本质上，问题是如何将示例中提供的 QML 代码转换为 C++。

标签： c++qtqt3d

解决方案

您必须使用QViewport类和setNormalizedRect函数在 [0.0, 0.0, 1.0, 1.0] 中指定。

像下面的东西。

//DECLARE A FRAME GRAPH
Qt3DRender::QFrameGraph *frameGraph = new Qt3DRender::QFrameGraph();
Qt3DRender::QTechniqueFilter *techniqueFilter = new Qt3DRender::QTechniqueFilter();

Qt3DRender::QViewport *viewport1 = new Qt3DRender::QViewport(techniqueFilter);
Qt3DRender::QViewport *viewport2 = new Qt3DRender::QViewport(techniqueFilter);
Qt3DRender::QViewport *viewport3 = new Qt3DRender::QViewport(techniqueFilter);
Qt3DRender::QViewport *viewport4 = new Qt3DRender::QViewport(techniqueFilter);

viewport1->setNormalizedRect(QRectF(0, 0, 0.5, 0.5));
viewport2->setNormalizedRect(QRectF(0.5, 0, 0.5, 0.5));
viewport3->setNormalizedRect(QRectF(0, 0.5, 0.5, 0.5));
viewport4->setNormalizedRect(QRectF(0.5, 0.5, 0.5, 0.5));

//SET ACTIVE FRAME GRAPH NODE TO YOUR WINDOW
your_qt3d_wndObject->setActiveFrameGraph(frameGraph->activeFrameGraph());

https://doc-snapshots.qt.io/qt5-5.9/qt3drender-qviewport.html

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