Very interesting project! Rendering where the GPU is used is a long time wish from many users. The current render engines available in Sweet Home 3D only use the CPU, not the GPU.

One thing is not clear to me: it appears that QtQuick3D is only available with either a GPL3 or a commercial license. This would mean that only the users with the last 7.5 open source version of Sweet Home 3D could use it without having to buy a commercial license. The versions offered by Spacemushrooms through the app stores are not open sourced. Maybe I am reading it wrong and it only concerns the plugin but it is more difficult to program plugins using a closed source Sweet Home 3D instead of the source in debug mode.

That won't make a difference for the many Linux users, they are all using 7.5. Many of the plugin developers are on Linux too so maybe they will take a closer look at the code.

Thank you for sharing this!