Initial Qt Quick Xr Documentation

Added the structure for the Qt Quick Xr QML module documentation,
with some to-do lists and stub pages. Images on the index page are
placeholders.

This creates the module documentation page to collect the
qtquick3d.Xr types.
Modified existing Qt Quick 3D pages to reference the new pages.

Change-Id: Ia88a7b0a1aa814ad34265d69d333ca3f3cb7e4f8
Reviewed-by: Christian Strømme <christian.stromme@qt.io>

14 files changed, 487 insertions, 1 deletions

diff --git a/examples/quick3d/xr_simple/doc/src/qtquick3d-examples-xrsimple.qdoc b/examples/quick3d/xr_simple/doc/src/qtquick3d-examples-xrsimple.qdoc
index 2cc68349..73abd8bd 100644
--- a/examples/quick3d/xr_simple/doc/src/qtquick3d-examples-xrsimple.qdoc
+++ b/examples/quick3d/xr_simple/doc/src/qtquick3d-examples-xrsimple.qdoc
@@ -4,8 +4,12 @@
 /*!
     \example xr_simple
     \ingroup quick3d-examples
+    \ingroup qt3dxr-examples
     \title Qt Quick 3D - XR Simple Example
     \examplecategory {3D}
     \brief Demonstrates setting up a simple VR scene with Qt Quick 3D XR.
     \image xrsimple-example.jpg
+
+    As with any XR application the root item of our main.qml is an XrView.
+
 */
diff --git a/src/quick3d/doc/qtquick3d.qdocconf b/src/quick3d/doc/qtquick3d.qdocconf
index 49207555..610a5f13 100644
--- a/src/quick3d/doc/qtquick3d.qdocconf
+++ b/src/quick3d/doc/qtquick3d.qdocconf
@@ -80,7 +80,7 @@ navigation.qmltypespage = "Qt Quick 3D QML Types"
 navigation.cppclassespage = "Qt Quick 3D C++ Classes"
 
 tagfile                 = qtquick3d.tags
-
+macro.qxr = "Qt Quick 3D Xr"
 # Fail the documentation build if warnings exceed the limit
 #   src/quick3d/qquick3dtexture.cpp:653: (qdoc) warning: Can't link to 'RenderExtension'
 warninglimit = 1
diff --git a/src/quick3d/doc/src/qtquick3d-index.qdoc b/src/quick3d/doc/src/qtquick3d-index.qdoc
index 94ab989f..a85d3f30 100644
--- a/src/quick3d/doc/src/qtquick3d-index.qdoc
+++ b/src/quick3d/doc/src/qtquick3d-index.qdoc
@@ -13,6 +13,8 @@ provides extensions to the existing \l{Qt Quick Scene Graph} for spatial content
 and a renderer for that extended scene graph. When using the spatial scene
 graph, it's possible to mix Qt Quick 2D content with 3D content.
 
+Qt Quick 3D also provides for XR and VR applications with \l{\qxr}.
+
 \image dragon.jpg
 
 \section1 Using the Module
@@ -27,6 +29,7 @@ The following module imports provide additional functionality:
 import QtQuick3D.AssetUtils
 import QtQuick3D.Helpers
 import QtQuick3D.Particles3D
+import QtQuick3D.Xr
 \endqml
 
 \section2 C++ API
@@ -76,6 +79,7 @@ and functionality that were done for the Qt 6 series of Qt.
     \li \l{Qt Quick 3D Level of Detail}{Level of Detail}
     \li \l{Custom Material Editor}{Custom Material Editor}
     \li \l{quick3d-lightmap}{Lightmaps and Global Illumination}
+    \li \l{\qxr Overview}
 \endlist
 
 \section1 Examples
@@ -94,6 +98,7 @@ and functionality that were done for the Qt 6 series of Qt.
     \li \l{Qt Quick 3D - Custom Geometry Example}{Adding Custom Geometry from C++}
     \li \l{Qt Quick 3D - Procedural Texture Example}{Adding Custom Texture Data from C++}
     \li \l{Qt Quick 3D - Baked Lightmap Example}{Using baked lightmaps}
+    \li \l{Qt Quick 3D - XR Simple Example}{Demonstrates setting up a simple VR scene}
     \li \l{Qt Quick 3D Examples and Tutorials}{All examples}
 \endlist
 
@@ -105,6 +110,7 @@ and functionality that were done for the Qt 6 series of Qt.
     \li \l{QtQuick3D.AssetUtils QML Types}
           {Qt Quick 3D Asset Utility QML Types}
     \li \l{Qt Quick 3D Particles3D QML Types}
+    \li \l{\qxr}
 \endlist
 
 \section1 Related Modules
diff --git a/src/quick3d/doc/src/xr/qt3dxr-apple-vision-pro-quick-start.qdoc b/src/quick3d/doc/src/xr/qt3dxr-apple-vision-pro-quick-start.qdoc
new file mode 100644
index 00000000..7a78c825
--- /dev/null
+++ b/src/quick3d/doc/src/xr/qt3dxr-apple-vision-pro-quick-start.qdoc
@@ -0,0 +1,37 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial
+/*!
+    \page qt3dxr-quick-start-guide-applevisionpro.html
+    \title Getting Started With the Apple Vision Pro
+
+    \summary This topic provides instructions on how to get up and running
+    with \qxr on an Apple Vision Pro.
+
+
+    For the Meta Quest 3 see \l{\qxr Quick Starter Guide}.
+    The video below demonstrates the process.
+
+    //!TODO Add video link
+
+    \section1 Download and installation
+
+    Complete the steps on the \l{Installing \qxr} page.
+
+    \section1 Setting up the Simple Example Project
+    \list 1
+    \li Open the example project from the qt creator welcome screen.
+    \li Configure the project settings (Projects mode: Ctrl+5 by default)
+        \list 1
+        \li Confirm that the applicable Android Kit for your target device is
+        chosen for compilation.
+        \li Choose the target , This can be quickly selected from the deploy widget,
+        as shown below:
+        \endlist
+    \endlist
+
+    \section1 Deploy the app
+
+    Click \uicontrol{Run}. This will complete the build, and install the device
+    to the headset and run it.
+
+*/
diff --git a/src/quick3d/doc/src/xr/qt3dxr-examples.qdoc b/src/quick3d/doc/src/xr/qt3dxr-examples.qdoc
new file mode 100644
index 00000000..97040e1a
--- /dev/null
+++ b/src/quick3d/doc/src/xr/qt3dxr-examples.qdoc
@@ -0,0 +1,18 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial
+/*!
+    \page qt3dxr-examples.html
+    \title \qxr Examples
+    \brief This page lists the examples and information common to them.
+
+    This is a list of all examples included in \qxr:
+
+    \annotatedlist qt3dxr-examples
+
+    \target qt3dxr-app-specifics
+
+    \include examples-run.qdocinc
+
+    Make sure you have selected the correct target device and kit combination.
+
+*/
diff --git a/src/quick3d/doc/src/xr/qt3dxr-installing.qdoc b/src/quick3d/doc/src/xr/qt3dxr-installing.qdoc
new file mode 100644
index 00000000..8a73e232
--- /dev/null
+++ b/src/quick3d/doc/src/xr/qt3dxr-installing.qdoc
@@ -0,0 +1,63 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial
+/*!
+    \page qt3dxr-installing.html
+    \title Installing \qxr
+    \previouspage \qxr Quick Starter Guide
+
+    \brief Covers the steps required to install \qxr .
+
+    Before starting, check if there are any instructions regarding the current
+    \l{\qxr Known Issues and Limitations} that are relevant to installation.
+
+    \section1 Quick install with the Qt Online Installer
+
+    Go to \l{Get and Install Qt} and follow the instructions there, making sure
+    at \e{step 3} to select \uicontrol{Qt Quick 3d XR} under the relevant Qt Version.
+
+    Then move on to \l{Installing 3rd Party Dependencies}.
+
+    \section1 Custom install with the Qt Online Installer
+
+    If you want to install additional Qt modules or tools at the same time, then
+    this method is for you.
+
+    Go to \l{Get and Install Qt} and follow the instructions there, except now
+    as opposed to the quick install method, making sure at \e{step 3} to select
+    \uicontrol{Custom Installation} and then select the following components:
+
+    \list
+        \li \qxr
+        \li Under the same \c{Qt Version} that you selected for \qxr, select:
+        \list
+            \li Qt for Android. (If developing for the Meta Quest 3)
+            \li Qt Quick 3D
+        \endlist
+    \endlist
+
+    Then, select other Qt modules or tools that are available to you.
+
+    \section1 Installing 3rd Party Dependencies
+
+    The following dependencies are required:
+
+    \section2 Meta devices
+
+    Meta's SDK is based on the \l OpenXR API, and as such, \qxr has been designed
+    to support that SDK. It is also Meta's ongoing supported SDK.
+
+    \list
+        \li The \l{Oculus OpenXR Mobile SDK}
+    \endlist
+
+    \section2 Apple devices
+
+    \section3 Host Environment
+
+    \section2 Android-based devices
+
+    If this is your first time developing with Qt for Android or using Qt Creator,
+    you must complete some additional steps to set up your build environment.
+    See \l{Getting Started with Qt for Android} for more information.
+
+*/
diff --git a/src/quick3d/doc/src/xr/qt3dxr-known-issues.qdoc b/src/quick3d/doc/src/xr/qt3dxr-known-issues.qdoc
new file mode 100644
index 00000000..a06a7f8a
--- /dev/null
+++ b/src/quick3d/doc/src/xr/qt3dxr-known-issues.qdoc
@@ -0,0 +1,26 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial
+
+/*!
+    \page qt3dxr-known-issues.html
+    \title \qxr Known Issues and Limitations
+
+    \section1 Known limitations
+    \qxr at the current stage has the following limitations:
+
+    \list
+        \li \qxr is in technology preview in this release.
+    \endlist
+
+    \section1 Known issues, bugs, and defects
+
+    All known issues, bugs, and defects with this patch release are listed here.
+
+    \generatelist qtxr-has-known-issues
+
+    \section1 Reporting issues
+
+    Please log any issues you may find by following the instructions at
+    \l{Reporting}.
+
+*/
diff --git a/src/quick3d/doc/src/xr/qt3dxr-overview.qdoc b/src/quick3d/doc/src/xr/qt3dxr-overview.qdoc
new file mode 100644
index 00000000..de8a71a6
--- /dev/null
+++ b/src/quick3d/doc/src/xr/qt3dxr-overview.qdoc
@@ -0,0 +1,109 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial
+/*!
+    \page qtxr-overview.html
+    \title \qxr Overview
+    \brief This page describes the architecture and features of this module and
+    is intended for developers.
+
+    \qxr allows you to leverage the many features of the Qt framework while still
+    being able to deploy a native application to a compatible VR or XR headset. Or
+    run an application on a host that streams to a headset.
+
+    \section1 Concepts and Technologies
+    There are many concepts and technologies in the fragmented XR technology landscape.
+    This section will define and distinguish between key concepts essential to
+    understanding \qxr.
+
+    \section2 Types of immersion
+
+    Here, we talk about the different immersion levels that exist.
+
+    \section3 Virtual Reality (VR)
+
+    Perhaps the first and most ambitious level of immersion, replacing a person's visual
+    and auditory input with a computer-generated environment that matches the motion of
+    their head, eyes, or both.
+
+    \section3 Extended Reality (XR)
+
+    \note Sometimes referred to as Spatial Reality
+
+    Coined initially as augmented reality (AR), then mixed reality (MR), this type of
+    immersion combines virtual information (either 2D or 3D content) with live visual
+    information of the user's real-world environment. It can provide the information
+    as an overlay on a translucent screen or onto a display that masks the real world entirely.
+
+    \section2 Head-mounted displays and degrees of freedom
+
+    //!TODO Add images explaining 3 DOF 6 DOF and how that applies to head-mounted displays.
+
+    \section2 Interaction Types
+
+    \section3 Controllers
+
+    \section3 Hand tracking
+
+    \section3 Body tracking
+
+    \section1 Marketing jargon
+
+    //!TODO
+
+    \section1 Under the hood
+
+    It is essential that developers understand the API platform landscape in the XR world.
+    //!TODO
+        //!TODOOpenXR, OpenXR implementations, OpenXR vs. the real underlying APIs (evolution, OpenVR,
+        //!TODOstandardization, concepts such as API versus runtime.
+        //!TODO(see \l https://registry.khronos.org/OpenXR/specs/1.1/html/xrspec.html#_what_is_openxr ), etc.)
+
+        //!TODO\list
+        //!TODO  \li The relation to 3D graphics APIs.
+        //!TODO  \li Practical implications, OpenXR headers, loader library, extensions
+        //!TODO      (link to Khronos upstream repo), explain the basic build process.
+        //!TODO    //!TODO  \li Explain the vendor-specific loader issue and the need, for the time being,
+         //!TODO     to use vendor-specific libraries during the Qt and application build process.
+         //!TODO \li Advanced (smaller priority since PCVR is not our primary focus with the Quest 3):
+         //!TODO     \list
+         //!TODO     \li PCVR vs. native application on the device story.
+         //!TODO     \li Wired and wireless streaming solutions. With concrete examples
+         //!TODO     \endlist
+      //!TODO (e.g. demonstrate that Quest 3 can be used in both ways, while, for example, Varjo is a
+      //!TODO PCVR-only solution)
+      //!TODO \li Non-OpenXR-based platforms: a brief introduction to Apple's Vision Pro architecture.
+
+      //!TODO Two good resources are the old readme to be fully incorporated into the docs eventually
+      //!TODO\l https://git.qt.io/annichol/qtquick3dxr/-/blob/6.7/README.md?ref_type=heads and
+      //!TODO\l https://github.com/mbucchia/VirtualDesktop-OpenXR/wiki is an excellent introduction
+      //!TODOto the PCVR world.
+    //!TODO\endlist
+
+    \section1 Support
+
+    The support case for devices in this area is evolving rapidly as the market
+    expands, support is added when parity exists between two types of headsets.
+
+    Currently, this is split between OpenXR, Apple, and Google/Samsung devices.
+
+    \table
+        \header Feature Matrix
+        \header  \li Feature \li Apple \li Meta \li Samsung
+        \row \li Pass-through \li No \li Yes \li NA
+        \row \li Controller input  \li No \li No \li NA
+        \row \li \li No \li No \li NA
+        \row \li Haptic Feedback  \li No \li No \li NA
+        \row \li Hand Interaction \li No \li No \li NA
+        \row \li Body Tracking \li No \li No \li NA
+    \endtable
+
+    The OpenXR SDK for your target headset and if developing a native application for an
+    Android-based headset, you will need \l{Qt for Android}.
+
+    \section1 Where to go from here?
+
+    Head to the \l{\qxr Quick Starter Guide}, \l{\qxr Examples}{examples},
+    or head back to the \l{\qxr}{home page} where you will find what's new and
+    other important information in this version.
+
+*/
diff --git a/src/quick3d/doc/src/xr/qt3dxr-permissions.qdoc b/src/quick3d/doc/src/xr/qt3dxr-permissions.qdoc
new file mode 100644
index 00000000..83643f65
--- /dev/null
+++ b/src/quick3d/doc/src/xr/qt3dxr-permissions.qdoc
@@ -0,0 +1,26 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial
+
+/*!
+    \title Android Manifests and \qxr features
+    \brief Permissions needed by \qxr on certain headsets.
+    \page qt3dxr-permissions.html
+    //!TODO
+    //!Briefly discusses how \qxr knows where to find the manifest file and where the user
+    //!needs to look for it to manually add the permissions for the features they want to use.
+    //!Unfortunately, there is no good link to a  table of what permissions the Meta OpenXR SDK
+    //!uses, but we could link to the feature page for each type that uses it.
+    \section1 Meta Quest 3
+
+    See \l{https://developer.oculus.com/documentation/native/android/mobile-native-manifest/}{Meta's Manifest docs}
+    for details about what is needed for every app targeting a Meta platform.
+    The following table details what is needed by specific \qxr features.
+    \table
+        \header \li QML Type \li Android Manifest Entry Needed
+        \row \li \li
+        \row \li \li
+        \row \li \li
+        \row \li \li
+    \endtable
+
+*/
diff --git a/src/quick3d/doc/src/xr/qt3dxr-qml-module.qdoc b/src/quick3d/doc/src/xr/qt3dxr-qml-module.qdoc
new file mode 100644
index 00000000..53f687a3
--- /dev/null
+++ b/src/quick3d/doc/src/xr/qt3dxr-qml-module.qdoc
@@ -0,0 +1,11 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
+
+/*!
+    \qmlmodule QtQuick3D.Xr
+    \title \qxr QML Types
+    \brief Types for leveraging XR device features.
+
+    This module provides QML types that enable you to use the features
+    on XR platforms.
+*/
diff --git a/src/quick3d/doc/src/xr/qt3dxr-quick-starter-guide.qdoc b/src/quick3d/doc/src/xr/qt3dxr-quick-starter-guide.qdoc
new file mode 100644
index 00000000..82c91dc6
--- /dev/null
+++ b/src/quick3d/doc/src/xr/qt3dxr-quick-starter-guide.qdoc
@@ -0,0 +1,40 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial
+/*!
+    \page qt3dxr-quick-start-guide.html
+    \title \qxr Quick Starter Guide
+
+    \brief This topic provides instructions on how to get up and running
+    on a meta quest headset.
+
+    This page lists all the instructions you need to get up an running with
+    \qxr. It uses Qt Creator for automated setup where possible and assumes you
+    have a Meta Quest 3 device. For the Apple Vision Pro, see
+    \l{Getting Started With the Apple Vision Pro}.
+
+    The video below demonstrates the process.
+
+    //!TODO Add video link( once recorded)
+
+    \section1 Download and installation
+
+    Complete the steps on the \l{Installing \qxr} page.
+
+    \section1 Setting up the Simple Example Project
+    \list 1
+    \li Open the example project from the qt creator welcome screen.
+    \li Configure the project settings (Projects mode: Ctrl+5 by default)
+        \list 1
+        \li Confirm that the applicable Android Kit for your target device is
+        chosen for compilation.
+        \li Choose the target , This can be quickly selected from the deploy widget,
+        as shown below:
+        \endlist
+    \endlist
+
+    \section1 Deploy the app
+
+    Click \uicontrol{Run}. This will complete the build, and install the device
+    to the headset and run it.
+
+*/
diff --git a/src/quick3d/doc/src/xr/qt3dxr-supported-platforms.qdoc b/src/quick3d/doc/src/xr/qt3dxr-supported-platforms.qdoc
new file mode 100644
index 00000000..96a3660f
--- /dev/null
+++ b/src/quick3d/doc/src/xr/qt3dxr-supported-platforms.qdoc
@@ -0,0 +1,32 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial
+
+/*!
+    \page qt3dxr-supported-platforms.html
+    \title Supported Headsets
+    \target Supported Platforms
+
+    This page outlines the combinations of use cases that are supported.
+
+    \section1 Supported hardware
+
+    \table
+        \header Support matrix
+        \header \li Platform \li PCVR Streaming \li Native \li Debugging
+        \row \li Quest 2 \li Yes \li Yes \li Yes
+        \row \li Quest 3 \li Yes \li Yes \li Yes
+        \row \li Quest Pro \li Yes \li Yes \li Yes
+        \row \li Varjo \li Yes \li NA \li Na
+        \row \li Apple Vision Pro \li Na \li Yes \li No
+    \endtable
+
+    This hardware is used when developing \qxr.
+
+    \section1 Supported development host environments
+
+    \qxr supports the same host platforms that \l Qt supports.
+
+    If you need to run applications for other host architectures or operating
+    systems, contact \l{contact Qt sales}{the Qt Company}.
+
+*/
diff --git a/src/quick3d/doc/src/xr/qt3dxr-toc.qdoc b/src/quick3d/doc/src/xr/qt3dxr-toc.qdoc
new file mode 100644
index 00000000..b6a2b10b
--- /dev/null
+++ b/src/quick3d/doc/src/xr/qt3dxr-toc.qdoc
@@ -0,0 +1,69 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial
+
+/*!
+    \page qtaa-toc.html
+    \title All Topics
+
+    List of all topics in \qxr documentation.
+
+    \list
+
+//! [listitems-platforms-and-toolchains]
+    \li Platforms and Toolchains
+        \list
+            \li \l{Supported Headsets}
+            \li \l{Android Manifests and \qxr features}
+        \endlist
+//! [listitems-platforms-and-toolchains]
+
+//! [listitems-getting-started]
+    \li Getting Started
+        \list
+            \li \l{\qxr Quick Starter Guide}
+            \li \l{\qxr Overview}
+            \li \l{Installing \qxr}
+        \endlist
+//! [listitems-getting-started]
+
+//! [listitems-api-reference]
+    \li API Reference
+        \list
+            \li \l{\qxr QML Types}
+        \endlist
+//! [listitems-api-reference]
+
+
+//! [listitems-examples]
+    \li \l{\qxr Examples}{Examples}
+        \list
+            \li \l{Qt Quick 3D - XR Simple Example}
+        \endlist
+//! [listitems-examples]
+
+//! [tools-ide]
+    \li Tools and IDEs
+        \list
+            \li \l{CMake Manual}
+            \li \l{Qt Creator Manual}
+            \li \l{Qt Design Studio}
+        \endlist
+//! [tools-ide]
+
+//! [developing-applications]
+    \li Developing XR Applications
+        \list
+            \li \l{Locomotion}
+            \li \l{Interaction}
+            \li \l{Comfort and Accessibility}
+        \endlist
+//! [developing-applications]
+
+//! [listitems-quick-links]
+    \li \l{Supported Headsets}
+    \li \l{\qxr Known Issues and Limitations}
+    \li \l{\qxr Quick Starter Guide}
+//! [listitems-quick-links]
+
+    \endlist
+*/
diff --git a/src/quick3d/doc/src/xr/qt3dxr.qdoc b/src/quick3d/doc/src/xr/qt3dxr.qdoc
new file mode 100644
index 00000000..da23083e
--- /dev/null
+++ b/src/quick3d/doc/src/xr/qt3dxr.qdoc
@@ -0,0 +1,45 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial
+/*!
+    \nextpage \qxr Overview
+    \page qt-quick-3d-xr.html
+    \title \qxr
+    //! A placeholder image, using exising image
+    \image dragon.jpg
+
+    \qxr allows you to develop Qt applications for extended reality
+    devices that take full advantage of the different immersion levels and
+    human-machine interface styles offered
+
+    The \l{\qxr Overview} page discusses the different approaches to modifying a
+    users perceived reality and clarified the concepts and technologies that are
+    referenced throughout this documentation.
+
+    \section1 Quick Links
+
+    \list
+    \include qt3dxr-toc.qdoc listitems-quick-links
+    \endlist
+
+    //! NOTE: This table refers to list items in qt3dxr-toc.qdoc - add new items there
+    //! Using existing placeholder images for now
+    \table
+        \header
+            \li \image quick3d-custom-cube1-small.jpg
+            \li \image quick3d-custom-cube1-small.jpg
+            \li \image quick3d-custom-cube1-small.jpg
+        \row
+            \include qt3dxr-toc.qdoc listitems-platforms-and-toolchains
+            \include qt3dxr-toc.qdoc listitems-getting-started
+            \include qt3dxr-toc.qdoc listitems-api-reference
+        \header
+            \li \image quick3d-custom-cube1-small.jpg
+            \li \image quick3d-custom-cube1-small.jpg
+            \li \image quick3d-custom-cube1-small.jpg
+        \row
+            \include qt3dxr-toc.qdoc listitems-examples
+            \include qt3dxr-toc.qdoc tools-ide
+            \include qt3dxr-toc.qdoc developing-applications
+    \endtable
+
+*/