[Interest] Trouble compiling qt3d for qt6 on windows 10

[Paul Lemire]

I can't really help about the compile issues. But I should be able to 
help regarding the plugin error.

You likely need to copy a few more things from the qt3d build dir to 
your Qt install dir:

qt3d_build_dir/qml/Qt3D into Qt_Install_Dir/qml/

qt3d_build_dir/qml/QtQuick/* into Qt_Install_Dir/qml/QtQuick/

qt3d_build_dir/plugins/* into Qt_Install_Dir/plugins/

(the plugins dir contains a renderers folder which contains the Qt3D 
render plugins)

I hope that helps,

Paul

On 2/15/21 11:03 AM, Daniel Patel wrote:
> I have compiled qt6.1 from source which works and now I am trying to 
> compile qt3d also from source by downloading from 
> https://download.qt.io/official_releases/additional_libraries/qt3d/6.0/6.0.0/ 
> <https://download.qt.io/official_releases/additional_libraries/qt3d/6.0/6.0.0/> 
> and following the qmake instructions from: 
> https://www.kdab.com/getting-your-3d-ready-for-qt-6/ 
> <https://www.kdab.com/getting-your-3d-ready-for-qt-6/>
>
> I first tried to download and compile qt3d-everywhere-src-6.0.1 but 
> got an error about missing zlib.h. Instead of trying to fix this I 
> quickly instead tried with qt3d-everywhere-src-6.0.0 and this compiled 
> fine.
> However it only compiled debug dlls and not release dlls. I tried to 
> do nmake all and nmake release but the latter gave the error "NMAKE : 
> fatal error U1073: don't know how to make 
> 'C:\qtsrc\qt61\qt5\qtbase\lib\Qt6Gui.lib'"
> I then decided to try out the debug build. First I noticed that the 
> qt3d dlls didnt seem to have been copied over to the correct folder 
> when I did nmake install. So I copied them over manually and then 
> started basicshapes-cpp.exe, but this showed the runtime error: Unable 
> to find renderer plugin for opengl.
> Any hints for what to do?
>
> Best
> Daniel
>
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-- 
Paul Lemire | paul.lemire at kdab.com | Senior Software Engineer
KDAB (France) S.A.S., a KDAB Group company
Tel: France +33 (0)4 90 84 08 53, http://www.kdab.fr
KDAB - The Qt, C++ and OpenGL Experts

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