在QML Scene3D中使用Qt3D QEntity

Use Qt3D QEntity in QML Scene3D

本文关键字：Qt3D QEntity QML Scene3D      更新时间：2023-10-16

我想添加一个c++ QEntity到QML Scene3D，像这样:

//C++
class MapEntity : public Qt3DCore::QEntity {
    public:
    MapEntity( Qt3DCore::QEntity* parent ) : Qt3DCore::QEntity(parent) {
        ...
    }
}
// QML
Scene3D {
    MapEntity {
        id: map
        ...
    }
}

有可能吗?如果是，该怎么做?

或者可以创建c++场景(例如Qt3DExtras::Qt3DWindow)并在QML中使用?

是的，在c++代码中定义QEntity然后使用它是可能的。方法描述如下:

http://doc.qt.io/qt-5/qtqml-cppintegration-definetypes.html

首先，您正在创建QEntity。例如:

class MyEntity : public Qt3DCore::QEntity {
    public:
        MyEntity( Qt3DCore::QEntity* parent=0 ) : Qt3DCore::QEntity(parent) {
                Qt3DRender::QMaterial *material = new Qt3DExtras::QPhongMaterial;
                Qt3DExtras::QSphereMesh *sphereMesh = new Qt3DExtras::QSphereMesh;
                sphereMesh->setRadius(8);
                addComponent(sphereMesh);
                addComponent(material);
        }
        virtual         ~MyEntity() {}
};

然后注册为qml组件:

qmlRegisterType<MyEntity>("com.company.my", 1, 0, "MyEntity");

在QML中使用:

Scene3D {
    id: myScene
    anchors.fill: parent
    cameraAspectRatioMode: Scene3D.AutomaticAspectRatio
    focus: true
    enabled: true

    Entity {
        id: sceneRoot
        Quick.Camera {
            id: camera
            projectionType: Quick.CameraLens.PerspectiveProjection
            fieldOfView: 45
            nearPlane : 0.1
            farPlane : 1000.0
            position: Qt.vector3d( 0.0, 0.0, 40.0 )
            upVector: Qt.vector3d( 0.0, 1.0, 0.0 )
            viewCenter: Qt.vector3d( 0.0, 0.0, 0.0 )
        }
        components: [
            Quick.RenderSettings {
                activeFrameGraph: ForwardRenderer {
                    clearColor: Qt.rgba(0, 0.5, 1, 0)
                    camera: camera
                }
            }
        ]
        MyEntity {
            id: myEnt
        }
    }
}
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