示例#1
1
文件: main.cpp 项目: RSATom/Qt
int main(int ac, char **av)
{
    QApplication app(ac, av);
    Qt3DExtras::Qt3DWindow view;
    view.defaultFrameGraph()->setClearColor(Qt::black);

    // Root entity
    Qt3DCore::QEntity *sceneRoot = new Qt3DCore::QEntity();

    // Scene Camera
    Qt3DRender::QCamera *camera = view.camera();
    camera->setProjectionType(Qt3DRender::QCameraLens::PerspectiveProjection);
    camera->setViewCenter(QVector3D(0.0f, 3.5f, 0.0f));
    camera->setPosition(QVector3D(0.0f, 3.5f, 25.0f));
    camera->setNearPlane(0.001f);
    camera->setFarPlane(10000.0f);

    // For camera controls
    Qt3DExtras::QFirstPersonCameraController *camController = new Qt3DExtras::QFirstPersonCameraController(sceneRoot);
    camController->setCamera(camera);

    // Scene loader
    Qt3DCore::QEntity *sceneLoaderEntity = new Qt3DCore::QEntity(sceneRoot);
    Qt3DRender::QSceneLoader *sceneLoader = new Qt3DRender::QSceneLoader(sceneLoaderEntity);
    SceneWalker sceneWalker(sceneLoader);
    QObject::connect(sceneLoader, &Qt3DRender::QSceneLoader::statusChanged, &sceneWalker, &SceneWalker::onStatusChanged);
    sceneLoaderEntity->addComponent(sceneLoader);

    QStringList args = QCoreApplication::arguments();
    QUrl sourceFileName;
    if (args.count() <= 1) {
        QWidget *container = new QWidget();
        QFileDialog dialog;
        dialog.setFileMode(QFileDialog::AnyFile);
        sourceFileName = dialog.getOpenFileUrl(container, QStringLiteral("Open a scene file"));
    } else {
        sourceFileName = QUrl::fromLocalFile(args[1]);
    }

    if (sourceFileName.isEmpty())
        return 0;

    sceneLoader->setSource(sourceFileName);

    view.setRootEntity(sceneRoot);
    view.show();

    return app.exec();
}
示例#2
0
    void checkSyncFrustumCullingExecution()
    {
        // GIVEN
        Qt3DRender::QViewport *viewport = new Qt3DRender::QViewport();
        Qt3DRender::QClearBuffers *clearBuffer = new Qt3DRender::QClearBuffers(viewport);
        Qt3DRender::QFrustumCulling *frustumCulling = new Qt3DRender::QFrustumCulling(clearBuffer);
        Qt3DRender::QCameraSelector *cameraSelector = new Qt3DRender::QCameraSelector(frustumCulling);
        Qt3DRender::QCamera *camera = new Qt3DRender::QCamera();
        cameraSelector->setCamera(camera);

        Qt3DRender::TestAspect testAspect(buildSimpleScene(viewport));

        // THEN
        Qt3DRender::Render::FrameGraphNode *leafNode = testAspect.nodeManagers()->frameGraphManager()->lookupNode(cameraSelector->id());
        QVERIFY(leafNode != nullptr);

        // WHEN
        Qt3DRender::Render::RenderViewBuilder renderViewBuilder(leafNode, 0, testAspect.renderer());
        renderViewBuilder.prepareJobs();
        renderViewBuilder.buildJobHierachy();

        // THEN
        QCOMPARE(renderViewBuilder.frustumCullingJob()->viewProjection(), QMatrix4x4());

        // WHEN
        renderViewBuilder.renderViewJob()->run();
        renderViewBuilder.syncFrustumCullingJob()->run();

        // THEN
        QCOMPARE(renderViewBuilder.frustumCullingJob()->viewProjection(), camera->projectionMatrix() * camera->viewMatrix());
    }
示例#3
0
QgsChunkedEntity::SceneState _sceneState( QgsCameraController *cameraController )
{
  Qt3DRender::QCamera *camera = cameraController->camera();
  QgsChunkedEntity::SceneState state;
  state.cameraFov = camera->fieldOfView();
  state.cameraPos = camera->position();
  QRect rect = cameraController->viewport();
  state.screenSizePx = std::max( rect.width(), rect.height() ); // TODO: is this correct?
  state.viewProjectionMatrix = camera->projectionMatrix() * camera->viewMatrix();
  return state;
}
示例#4
0
float Qgs3DMapScene::worldSpaceError( float epsilon, float distance )
{
  Qt3DRender::QCamera *camera = mCameraController->camera();
  float fov = camera->fieldOfView();
  QRect rect = mCameraController->viewport();
  float screenSizePx = std::max( rect.width(), rect.height() ); // TODO: is this correct?

  // in qgschunkedentity_p.cpp there is inverse calculation (world space error to screen space error)
  // with explanation of the math.
  float frustumWidthAtDistance = 2 * distance * tan( fov / 2 );
  float err = frustumWidthAtDistance * epsilon / screenSizePx;
  return err;
}
示例#5
0
文件: main.cpp 项目: RSATom/Qt
int main(int argc, char* argv[])
{
    QGuiApplication app(argc, argv);
    Qt3DExtras::Qt3DWindow view;

    ExampleScene *sceneRoot = new ExampleScene();

    // Scene Camera
    Qt3DRender::QCamera *basicCamera = view.camera();
    basicCamera->setProjectionType(Qt3DRender::QCameraLens::PerspectiveProjection);
    basicCamera->setAspectRatio(view.width() / view.height());
    basicCamera->setUpVector(QVector3D(0.0f, 1.0f, 0.0f));
    basicCamera->setViewCenter(QVector3D(0.0f, 3.5f, 0.0f));
    basicCamera->setPosition(QVector3D(0.0f, 3.5f, 25.0f));

    // For camera controls
    Qt3DExtras::QFirstPersonCameraController *camController = new Qt3DExtras::QFirstPersonCameraController(sceneRoot);
    camController->setCamera(basicCamera);

    view.setRootEntity(sceneRoot);
    view.show();

    return app.exec();
}
示例#6
0
bool Qgs3DMapScene::updateCameraNearFarPlanes()
{
  // Update near and far plane from the terrain.
  // this needs to be done with great care as we have kind of circular dependency here:
  // active nodes are culled based on the current frustum (which involves near + far plane)
  // and then based on active nodes we set near and far plane.
  //
  // All of this is just heuristics assuming that all other stuff is being rendered somewhere
  // around the area where the terrain is.
  //
  // Near/far plane is setup in order to make best use of the depth buffer to avoid:
  // 1. precision errors - if the range is too great
  // 2. unwanted clipping of scene - if the range is too small

  if ( mTerrain )
  {
    Qt3DRender::QCamera *camera = cameraController()->camera();
    QMatrix4x4 viewMatrix = camera->viewMatrix();
    float fnear = 1e9;
    float ffar = 0;

    QList<QgsChunkNode *> activeNodes = mTerrain->activeNodes();

    // it could be that there are no active nodes - they could be all culled or because root node
    // is not yet loaded - we still need at least something to understand bounds of our scene
    // so lets use the root node
    if ( activeNodes.isEmpty() )
      activeNodes << mTerrain->rootNode();

    Q_FOREACH ( QgsChunkNode *node, activeNodes )
    {
      // project each corner of bbox to camera coordinates
      // and determine closest and farthest point.
      QgsAABB bbox = node->bbox();
      for ( int i = 0; i < 8; ++i )
      {
        QVector4D p( ( ( i >> 0 ) & 1 ) ? bbox.xMin : bbox.xMax,
                     ( ( i >> 1 ) & 1 ) ? bbox.yMin : bbox.yMax,
                     ( ( i >> 2 ) & 1 ) ? bbox.zMin : bbox.zMax, 1 );
        QVector4D pc = viewMatrix * p;

        float dst = -pc.z();  // in camera coordinates, x grows right, y grows down, z grows to the back
        if ( dst < fnear )
          fnear = dst;
        if ( dst > ffar )
          ffar = dst;
      }
    }
    if ( fnear < 1 )
      fnear = 1;  // does not really make sense to use negative far plane (behind camera)

    if ( fnear == 1e9 && ffar == 0 )
    {
      // the update didn't work out... this should not happen
      // well at least temprarily use some conservative starting values
      qDebug() << "oops... this should not happen! couldn't determine near/far plane. defaulting to 1...1e9";
      fnear = 1;
      ffar = 1e9;
    }

    // set near/far plane - with some tolerance in front/behind expected near/far planes
    float newFar = ffar * 2;
    float newNear = fnear / 2;
    if ( !qgsFloatNear( newFar, camera->farPlane() ) || !qgsFloatNear( newNear, camera->nearPlane() ) )
    {
      camera->setFarPlane( newFar );
      camera->setNearPlane( newNear );
      return true;
    }
  }