5 files changed, 28 insertions, 3 deletions
diff --git a/src/quick3d/imports/scene3d/scene3ditem.cpp b/src/quick3d/imports/scene3d/scene3ditem.cpp
index 2510f7164..ba2b5224f 100644
--- a/src/quick3d/imports/scene3d/scene3ditem.cpp
+++ b/src/quick3d/imports/scene3d/scene3ditem.cpp
@@ -857,7 +857,10 @@ QSGNode *Scene3DItem::updatePaintNode(QSGNode *node, QQuickItem::UpdatePaintNode
         if (fboNode) {
             if (!fboNode->parent())
                 managerNode->appendChildNode(fboNode);
-            fboNode->setRect(boundingRect());
+
+            // Depending on the backend in use, we might or might not have
+            // to flip content
+            fboNode->setRect(boundingRect(), !renderer->isYUp());
         }
     }
 
diff --git a/src/quick3d/imports/scene3d/scene3drenderer.cpp b/src/quick3d/imports/scene3d/scene3drenderer.cpp
index a6ad43182..aa96f62a4 100644
--- a/src/quick3d/imports/scene3d/scene3drenderer.cpp
+++ b/src/quick3d/imports/scene3d/scene3drenderer.cpp
@@ -198,6 +198,11 @@ Scene3DSGNode *Scene3DRenderer::sgNode() const
     return m_node;
 }
 
+bool Scene3DRenderer::isYUp() const
+{
+    return m_quickRenderer ? m_quickRenderer->isYUp() : true;
+}
+
 // Executed in the QtQuick render thread (which may even be the gui/main with QQuickWidget / RenderControl).
 void Scene3DRenderer::shutdown()
 {
@@ -595,6 +600,11 @@ void Scene3DRenderer::RHIRenderer::shutdown(Scene3DRenderer *scene3DRenderer)
     releaseRHIResources();
 }
 
+bool Scene3DRenderer::RHIRenderer::isYUp() const
+{
+    return m_rhi->isYUpInNDC();
+}
+
 void Scene3DRenderer::RHIRenderer::releaseRHIResources()
 {
     delete m_rhiRenderTarget;
diff --git a/src/quick3d/imports/scene3d/scene3drenderer_p.h b/src/quick3d/imports/scene3d/scene3drenderer_p.h
index 72e6d34ce..a279f2a63 100644
--- a/src/quick3d/imports/scene3d/scene3drenderer_p.h
+++ b/src/quick3d/imports/scene3d/scene3drenderer_p.h
@@ -101,6 +101,7 @@ public:
 
     bool multisample() const { return m_multisample; }
     QSize boundingSize() const { return m_boundingRectSize; }
+    bool isYUp() const;
 
     void init(Qt3DCore::QAspectEngine *aspectEngine, QRenderAspect *renderAspect);
 
@@ -128,6 +129,7 @@ private:
         virtual void beforeRendering(Scene3DRenderer *scene3DRenderer) = 0;
         virtual void beforeRenderPassRecording(Scene3DRenderer *scene3DRenderer) = 0;
         virtual void shutdown(Scene3DRenderer *sceneRenderer) = 0;
+        virtual bool isYUp() const = 0;
 
     protected:
         bool m_lastMultisample = false;
@@ -148,6 +150,7 @@ private:
         void beforeRendering(Scene3DRenderer *scene3DRenderer) override;
         void beforeRenderPassRecording(Scene3DRenderer *scene3DRenderer) override;
         void shutdown(Scene3DRenderer *sceneRenderer) override;
+        bool isYUp() const override { return true; };
 
     private:
         QScopedPointer<QOpenGLFramebufferObject> m_multisampledFBO;
@@ -165,6 +168,7 @@ private:
         void beforeRendering(Scene3DRenderer *scene3DRenderer) override;
         void beforeRenderPassRecording(Scene3DRenderer *scene3DRenderer) override;
         void shutdown(Scene3DRenderer *sceneRenderer) override;
+        bool isYUp() const override;
 
     private:
         void releaseRHIResources();
diff --git a/src/quick3d/imports/scene3d/scene3dsgnode.cpp b/src/quick3d/imports/scene3d/scene3dsgnode.cpp
index 630cf49a9..011f0d0d3 100644
--- a/src/quick3d/imports/scene3d/scene3dsgnode.cpp
+++ b/src/quick3d/imports/scene3d/scene3dsgnode.cpp
@@ -74,11 +74,19 @@ Scene3DSGNode::~Scene3DSGNode()
     // is terminated.
 }
 
-void Scene3DSGNode::setRect(const QRectF &rect, const QRectF textureRect)
+void Scene3DSGNode::setRect(const QRectF &rect, bool mirrorVertically)
 {
     if (rect != m_rect) {
         m_rect = rect;
         // By default, map the item's bounding rect to normalized texture coordinates
+
+        QRectF textureRect = QRectF(0.0f, 1.0f, 1.0f, -1.0f);
+        if (mirrorVertically) {
+            float tmp = textureRect.top();
+            textureRect.setTop(textureRect.bottom());
+            textureRect.setBottom(tmp);
+        }
+
         QSGGeometry::updateTexturedRectGeometry(&m_geometry, m_rect, textureRect);
         markDirty(DirtyGeometry);
     }
diff --git a/src/quick3d/imports/scene3d/scene3dsgnode_p.h b/src/quick3d/imports/scene3d/scene3dsgnode_p.h
index 4c437b4a9..b33840aaf 100644
--- a/src/quick3d/imports/scene3d/scene3dsgnode_p.h
+++ b/src/quick3d/imports/scene3d/scene3dsgnode_p.h
@@ -75,7 +75,7 @@ public:
     }
     QSGTexture *texture() const noexcept { return m_material.texture(); }
 
-    void setRect(const QRectF &rect, const QRectF textureRect = QRectF(0.0f, 1.0f, 1.0f, -1.0f));
+    void setRect(const QRectF &rect, bool mirrorVertically = false);
     QRectF rect() const noexcept { return m_rect; }
 
     void show();