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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.

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 here.

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.


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