Fix more tests

src/3d/qgs3dutils.cpp

@@ -59,15 +59,21 @@ typedef Qt3DCore::QBuffer Qt3DQBuffer;
 // declared here as Qgs3DTypes has no cpp file
 const char *Qgs3DTypes::PROP_NAME_3D_RENDERER_FLAG = "PROP_NAME_3D_RENDERER_FLAG";
 
-static void waitForFrame( Qgs3DMapScene *scene )
+void Qgs3DUtils::waitForFrame( QgsAbstract3DEngine &engine, Qgs3DMapScene *scene )
 {
+  // Set policy to always render frame, so we don't wait forever.
+  Qt3DRender::QRenderSettings::RenderPolicy oldPolicy = engine.renderSettings()->renderPolicy();
+  engine.renderSettings()->setRenderPolicy( Qt3DRender::QRenderSettings::RenderPolicy::Always );
+
   // Wait for at least one frame to render
   Qt3DLogic::QFrameAction *frameAction = new Qt3DLogic::QFrameAction();
   scene->addComponent( frameAction );
   QEventLoop evLoop;
   QObject::connect( frameAction, &Qt3DLogic::QFrameAction::triggered, &evLoop, &QEventLoop::quit );
   evLoop.exec();
   scene->removeComponent( frameAction );
+
+  engine.renderSettings()->setRenderPolicy( oldPolicy );
 }
 
 QImage Qgs3DUtils::captureSceneImage( QgsAbstract3DEngine &engine, Qgs3DMapScene *scene )
@@ -78,7 +84,7 @@ QImage Qgs3DUtils::captureSceneImage( QgsAbstract3DEngine &engine, Qgs3DMapScene
   // We need to change render policy to RenderPolicy::Always, since otherwise render capture node won't work
   engine.renderSettings()->setRenderPolicy( Qt3DRender::QRenderSettings::RenderPolicy::Always );
 
-  waitForFrame( scene );
+  waitForFrame( engine, scene );
 
   auto saveImageFcn = [&evLoop, &resImage]( const QImage &img ) {
     resImage = img;
@@ -124,11 +130,10 @@ QImage Qgs3DUtils::captureSceneDepthBuffer( QgsAbstract3DEngine &engine, Qgs3DMa
   // We need to change render policy to RenderPolicy::Always, since otherwise render capture node won't work
   engine.renderSettings()->setRenderPolicy( Qt3DRender::QRenderSettings::RenderPolicy::Always );
 
-  waitForFrame( scene );
-
   auto requestImageFcn = [&engine, scene] {
     if ( scene->sceneState() == Qgs3DMapScene::Ready )
     {
+      waitForFrame( engine, scene );
       engine.renderSettings()->setRenderPolicy( Qt3DRender::QRenderSettings::RenderPolicy::OnDemand );
       engine.requestDepthBufferCapture();
     }

src/3d/qgs3dutils.h

@@ -65,6 +65,12 @@ class _3D_EXPORT Qgs3DUtils
      */
     static QImage captureSceneImage( QgsAbstract3DEngine &engine, Qgs3DMapScene *scene );
 
+    /**
+     * Waits for a frame to be rendered. Useful to trigger once-per-frame updates
+     * \since QGIS 3.42
+     */
+    static void waitForFrame( QgsAbstract3DEngine &engine, Qgs3DMapScene *scene );
+
     /**
      * Captures the depth buffer of the current 3D scene of a 3D engine. The function waits
      * until the scene is not fully loaded/updated before capturing the image.

src/3d/qgscameracontroller.cpp

@@ -572,6 +572,7 @@ void QgsCameraController::onWheel( Qt3DInput::QWheelEvent *wheel )
       if ( mCurrentOperation != MouseOperation::ZoomWheel )
       {
         setMouseParameters( MouseOperation::ZoomWheel );
+        // The actual zooming will happen after we get a new depth buffer
       }
       else
       {

tests/src/3d/testqgs3dcameracontroller.cpp

@@ -455,14 +455,22 @@ void TestQgs3DCameraController::testRotationCenterZoomWheelRotationCenter()
 
   // look from the top
   scene->cameraController()->setLookingAtPoint( QgsVector3D( 0, 0, 0 ), 2500, 0, 0 );
+  // XXX: Sometimes the near/far planes aren't calculated correctly, so they're
+  // left at the too-deep default. This causes the rest of the test to fail in
+  // weird ways every once in a while, so loop until we get good values.
+  do {
+    // Force recalcualtion of near/far planes.
+    scene->cameraController()->mCameraChanged = true;
+
+    // this call is not used but ensures to synchronize the scene
+    Qgs3DUtils::captureSceneImage( engine, scene );
+  } while(scene->cameraController()->camera()->nearPlane() < 1000);
+
   QVector3D initialCamViewCenter = scene->cameraController()->camera()->viewCenter();
   QVector3D initialCamPosition = scene->cameraController()->camera()->position();
   float initialPitch = scene->cameraController()->pitch();
   float initialYaw = scene->cameraController()->yaw();
 
-  // this call is not used but ensures to synchronize the scene
-  Qgs3DUtils::captureSceneImage( engine, scene );
-
   QMouseEvent mousePressEvent( QEvent::MouseButtonPress, midPos, Qt::LeftButton, Qt::LeftButton, Qt::ShiftModifier );
   scene->cameraController()->onMousePressed( new Qt3DInput::QMouseEvent( mousePressEvent ) );
 
@@ -522,8 +530,8 @@ void TestQgs3DCameraController::testRotationCenterZoomWheelRotationCenter()
   depthImage = Qgs3DUtils::captureSceneDepthBuffer( engine, scene );
   scene->cameraController()->depthBufferCaptured( depthImage );
 
-  QGSCOMPARENEARVECTOR3D( scene->cameraController()->mZoomPoint, QVector3D( 283.2, -923.1, -27.0 ), 1.5 );
-  QGSCOMPARENEARVECTOR3D( scene->cameraController()->cameraPose().centerPoint(), QVector3D( 99.4, -319.9, -8.8 ), 2.0 );
+  QGSCOMPARENEARVECTOR3D( scene->cameraController()->mZoomPoint, QVector3D( 312.936, -950.772, -125.381 ), 1.5 );
+  QGSCOMPARENEARVECTOR3D( scene->cameraController()->cameraPose().centerPoint(), QVector3D( 109.8, -329.4, -43.3 ), 2.0 );
   QGSCOMPARENEAR( scene->cameraController()->cameraPose().distanceFromCenterPoint(), 1631.9, 2.0 );
   QCOMPARE( scene->cameraController()->pitch(), initialPitch );
   QCOMPARE( scene->cameraController()->yaw(), initialYaw );
@@ -540,6 +548,7 @@ void TestQgs3DCameraController::testRotationCenterZoomWheelRotationCenter()
   initialPitch = scene->cameraController()->pitch();
   initialYaw = scene->cameraController()->yaw();
 
+  Qgs3DUtils::waitForFrame(engine, scene);
   // the first mouse event only updates the mouse position
   // the second one will update the camera
   QMouseEvent mouseMoveEvent3( QEvent::MouseMove, midPos + movement1 + movement2, Qt::LeftButton, Qt::LeftButton, Qt::ShiftModifier );
@@ -558,9 +567,9 @@ void TestQgs3DCameraController::testRotationCenterZoomWheelRotationCenter()
   QCOMPARE( scene->cameraController()->mCurrentOperation, QgsCameraController::MouseOperation::RotationCenter );
 
   diffViewCenter = scene->cameraController()->camera()->viewCenter() - initialCamViewCenter;
-  QGSCOMPARENEARVECTOR3D( diffViewCenter, QVector3D( 25.9, 7.1, 5.2 ), 1.0 );
+  QGSCOMPARENEARVECTOR3D( diffViewCenter, QVector3D( 26.9, 7.3, 5.4 ), 2.0 );
   diffPosition = scene->cameraController()->camera()->position() - initialCamPosition;
-  QGSCOMPARENEARVECTOR3D( diffPosition, QVector3D( -44.3, -9.1, -11.7 ), 1.0 );
+  QGSCOMPARENEARVECTOR3D( diffPosition, QVector3D( -43.2, -9.1, -11.1 ), 1.0 );
   diffPitch = scene->cameraController()->pitch() - initialPitch;
   diffYaw = scene->cameraController()->yaw() - initialYaw;
   QGSCOMPARENEAR( diffPitch, 2.5, 0.1 );
@@ -857,9 +866,9 @@ void TestQgs3DCameraController::testTranslateZoomWheelTranslate()
   QCOMPARE( scene->cameraController()->mCurrentOperation, QgsCameraController::MouseOperation::Translation );
 
   diffViewCenter = scene->cameraController()->camera()->viewCenter() - initialCamViewCenter;
-  QGSCOMPARENEARVECTOR3D( diffViewCenter, QVector3D( -11.3, 11.3, 0.0 ), 1.0 );
+  QGSCOMPARENEARVECTOR3D( diffViewCenter, QVector3D( -17.2, 17.2, 0.0 ), 1.0 );
   diffPosition = scene->cameraController()->camera()->position() - initialCamPosition;
-  QGSCOMPARENEARVECTOR3D( diffPosition, QVector3D( -11.3, 11.3, 0.0 ), 1.0 );
+  QGSCOMPARENEARVECTOR3D( diffPosition, QVector3D( -17.2, 17.2, 0.0 ), 1.0 );
   QCOMPARE( scene->cameraController()->pitch(), initialPitch );
   QCOMPARE( scene->cameraController()->yaw(), initialYaw );