Add a QQuickWidget-based Scene3D example

Shares the QML files with the scene3d example.

Task-number: QTBUG-52132
Change-Id: I076284b66a8dfdc3308171f11528851a7e20bbce
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

2 files changed, 56 insertions, 0 deletions

diff --git a/examples/qt3d/widgets-scene3d/doc/images/widgets-scene3d.png b/examples/qt3d/widgets-scene3d/doc/images/widgets-scene3d.png
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+++ b/examples/qt3d/widgets-scene3d/doc/images/widgets-scene3d.png
diff --git a/examples/qt3d/widgets-scene3d/doc/src/widgets-scene3d.qdoc b/examples/qt3d/widgets-scene3d/doc/src/widgets-scene3d.qdoc
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file. Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \example widgets-scene3d
+    \title Qt 3D: Scene3D QML with Widgets Example
+    \ingroup qt3d-examples-qml
+    \brief A QWidget-based application with a QML scene containing a 3D scene.
+
+    \image widgets-scene3d.png
+
+    \e {widgets-scene3D} demonstrates visualizing a 3D scene from a
+    QWidget-based application using QQuickWidget.
+
+    The actual 3D scene is the same as in the \e {scene3d} example.
+
+    This approach is different from the one based on
+    QWidget::createWindowContainer() demonstrated in \e {basicshapes-cpp}
+    because it does not create a native window for the Qt 3D content. Rather,
+    it uses QQuickWidget, a genuine QWidget subclass to compose the Qt Quick
+    and Qt 3D content together with the traditional widgets.
+
+    \note Be aware of the performance implications. While this approach is very
+    flexible in the sense that it allows mixing QML and Qt 3D with widgets
+    without clipping or stacking issues, using Scene3D in a QQuickWidget
+    involves rendering to offscreen render targets (via framebuffer objects)
+    twice. This is not always desirable for more complex scenes. For those the
+    native window based approach shown in \e {basicshapes-cpp} will likely be a
+    better choice.
+
+    \include examples-run.qdocinc
+*/