[Interest] Trouble compiling qt3d for qt6 on windows 10
paul.lemire at kdab.com
Tue Feb 16 14:22:28 CET 2021
On 2/16/21 1:33 PM, Daniel Patel wrote:
> Thanks a lot for the reply Paul, it was useful as always.
> Copying the files made the qt3d examples work!
> I realized that the compile error showed up because qt6 itself was
> only compiled in debug mode.
> With the appropriate flag to the configure script, qt6 now compiles
> both in debug and in release.
> However, now when compiling qt3d I ran into the error : "Could not
> find feature qt3d-simd-avx2" (I already configured and compiled qt6
> with -avx2 flag)
> I am just not able to tell/configure qt3d to use avx2 instead of sse2.
> Currently "qmake .." returns:
> Use SSE2 instructions .................. yes
> Use AVX2 instructions .................. no
> After running configure for the qt6 build I got this text as output:
> "To configure and build other Qt modules, you can use the following
> convenience script:
> So i did a "c:\Qt\Qt-6.1\bin\qt-configure-module.bat
> qt3d-everywhere-src-6.0.0 --qt3d-simd=avx2" but that failed with
> "Unknown command line option '--qt3d-simd=avx2'" (I also tried
> -avx2-qt3d-simd and -qt3d-simd-avx2)
> Anyone knows how to set configure flags for qt3d before compiling it?
What about -qt3d-simd avx2 (just a space)? That's what I use when
compiling on linux with qmake. For Qt 6, I've switched to cmake though,
option to use is -DFEATURE_qt3d_simd_avx2=ON on the cmake command line.
That being said, the avx2 option for Qt 3D essentially only yields
better performance when we multiply matrices internally. The sse2 option
is not much slower, a lot faster than relying on QMatrix4x4 (though this
might have changed in Qt6, haven't checked).
> On a side note I also was not able to get qt6 configure script to
> detect zlib libraries even though I set appropriate environment
> variables and sent in paths using both -D option as well as -I and -L
> man. 15. feb. 2021 kl. 11:47 skrev Paul Lemire <paul.lemire at kdab.com
> <mailto:paul.lemire at kdab.com>>:
> 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,
> 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
>> and following the qmake instructions from:
>> 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
>> 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?
>> Interest mailing list
>> Interest at qt-project.org <mailto:Interest at qt-project.org>
>> https://lists.qt-project.org/listinfo/interest <https://lists.qt-project.org/listinfo/interest>
> Paul Lemire |paul.lemire at kdab.com <mailto: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 <http://www.kdab.fr>
> KDAB - The Qt, C++ and OpenGL Experts
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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