本節官方Demo，使用Qt3D渲染場景

在main.cpp文件中，設置scene。

為了能使用相關的類和函數，需要include、Qt3DCore、Qt3D、Qt3DExtras模塊。

#include <Qt3DCore/QEntity>#include <Qt3DRender/QCamera>#include <Qt3DRender/QCameraLens>#include <Qt3DCore/QTransform>#include <Qt3DCore/QAspectEngine>#include <Qt3DInput/QInputAspect>#include <Qt3DRender/QRenderAspect>#include <Qt3DExtras/QForwardRenderer>#include <Qt3DExtras/QPhongMaterial>#include <Qt3DExtras/QCylinderMesh>#include <Qt3DExtras/QSphereMesh>#include <Qt3DExtras/QTorusMesh>

首先需要設置場景，和指定的root實體

Qt3DCore::QEntity *createScene(){Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity;

再使用PhongRendering為root實體指定material

Qt3DRender::QMaterial *material = new Qt3DExtras::QPhongMaterial(rootEntity);

在root實體上創建圓環實體，旋轉、以及material組建等：

Qt3DCore::QEntity *torusEntity = new Qt3DCore::QEntity(rootEntity);Qt3DExtras::QTorusMesh *torusMesh = new Qt3DExtras::QTorusMesh;torusMesh->setRadius(5);torusMesh->setMinorRadius(1);torusMesh->setRings(100);torusMesh->setSlices(20);Qt3DCore::QTransform *torusTransform = new Qt3DCore::QTransform;torusTransform->setScale3D(QVector3D(1.5, 1, 0.5));torusTransform->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(1, 0, 0), 45.0f));torusEntity->addComponent(torusMesh);torusEntity->addComponent(torusTransform);torusEntity->addComponent(material);

指定各個sphere的實體及他們的部件：

Qt3DCore::QEntity *sphereEntity = new Qt3DCore::QEntity(rootEntity);Qt3DExtras::QSphereMesh *sphereMesh = new Qt3DExtras::QSphereMesh;sphereMesh->setRadius(3);Qt3DCore::QTransform *sphereTransform = new Qt3DCore::QTransform;OrbitTransformController *controller = new OrbitTransformController(sphereTransform);controller->setTarget(sphereTransform);controller->setRadius(20.0f);QPropertyAnimation *sphereRotateTransformAnimation = new QPropertyAnimation(sphereTransform);sphereRotateTransformAnimation->setTargetObject(controller);sphereRotateTransformAnimation->setPropertyName("angle");sphereRotateTransformAnimation->setStartValue(QVariant::fromValue(0));sphereRotateTransformAnimation->setEndValue(QVariant::fromValue(360));sphereRotateTransformAnimation->setDuration(10000);sphereRotateTransformAnimation->setLoopCount(-1);sphereRotateTransformAnimation->start();sphereEntity->addComponent(sphereMesh);sphereEntity->addComponent(sphereTransform);sphereEntity->addComponent(material);

使用了一個屬性來實現動畫的效果。

最后，創建Qt3D窗口：

int main(int argc, char* argv[]){QGuiApplication app(argc, argv);Qt3DExtras::Qt3DWindow view;Qt3DCore::QEntity *scene = createScene();// CameraQt3DRender::QCamera *camera = view.camera();camera->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);camera->setPosition(QVector3D(0, 0, 40.0f));camera->setViewCenter(QVector3D(0, 0, 0));// For camera controlsQt3DExtras::QOrbitCameraController *camController = new Qt3DExtras::QOrbitCameraController(scene);camController->setLinearSpeed( 50.0f );camController->setLookSpeed( 180.0f );camController->setCamera(camera);view.setRootEntity(scene);view.show();return app.exec();}

總結

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