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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\page qt3d-changes-qt6.html
\title Changes to Qt3D
Qt 6 is a result of the conscious effort to make the framework more
efficient and easy to use.
We try to maintain binary and source compatibility for all the public
APIs in each release. But some changes were inevitable in an effort to
make Qt a better framework.
In this topic we summarize those changes in Qt3D, and provide guidance
to handle them.
\section1 New rendering backend
Over the course of 5.14 and 5.15, the rendering backend was gradually
moved into a plugin.
Qt 6 release completes this work and introduces a new RHI based rendering
backend which will enable use of Vulkan, Metal or DirectX on the relevant
platforms.
The RHI backend is the default but this can be controlled by setting
environment variables as explained \l {Qt 3D Render C++ Classes} {here}.
\section1 Code changes
Some classes have changed modules. In particular, the QBuffer, QAttribute
and QGeometry classes (along with associated helper classes) have moved
from the Render module to the Core module.
\section1 New API
\list
\li \l {Qt3DCore::QGeometryView} provides all details for a mesh
\li \l {Qt3DCore::QBoundingVolume} provides a way of querying or overriding
the size of the axis aligned bounding box of a geometry
\li \l {Qt3DRender::QPickingProxy} provides a way of specifying an alternative
(usually simpler) geometry for picking
\li \l {Qt3DCore::QAbstractAspect} and \l {Qt3DCore::QAspectJob} add methods
to facilitate and optimize the synchronization of backend operations.
\endlist
*/