Qt5.5 now includes Qt3D2.0 (rewrite of Qt3D, not compatible with Qt3D 1.0)

[andrew-hill]

Good news: Qt5.5 release notes indicate Qt3D is now (finally) included in the pre-built binaries, so it seems to be a legit component of Qt!

Bad news: It's been separated into a few submodules, so instead of just Qt3D there is now

• Qt3DCore
• Qt3DInput
• Qt3DRenderer

These two also start with Qt3D but I'm pretty sure Qt3DQuick was separate all along:

• Qt3DQuick
• Qt3DQuickRenderer

So this rather complicates the ability to build against Qt3D into three categories:

• Qt4
• Qt5 (up to 5.4)
• Qt5 (5.5+)

I've not actually found anything yet about this split (googling for Qt3DCore produces very few results), but assuming its the new structure going-forward, the question is whether to support all three of the above, or just the 'latest' state of Qt4 and Qt5.

Essentially, where we currently test for Qt4 vs Qt5 in snark's CMake, should I just switch the current Qt5 behaviour to be compatible with 5.5 only? or do we want to have 3 options (4, 5, 5.5+)?

[vlaskine]

great news!

i would be careful about disrupting the support of qt4 for now

those who have qt5, can as well get qt5.5

is the required change extensive?

[andrew-hill]

bad news... the version of Qt3D included in Qt5.5 is Qt3D 2.0 (previously we've been using 1.0 or patches upon 1.0)

so Qt5.5 onwards will include Qt3D 2, which is a complete rewrite of Qt3D—it sounds like it might even be a very design philosophy, not just small adjustments to the API

see comments here: http://www.kdab.com/qt3d-technology-preview-released-qt-5-5-0/

[vlaskine]

somehow, with compilation and runtime warnings, view-points and label-points happily rebuild with qt5.5

so far, i have not spotted any functionality broken (but i have not tried everything)

thus, i close this ticket; please report any specific qt5.5-related failures in separate tickets

[andrew-hill]

so i'm not exactly sure how this could have worked, unless the Mac and Linux qt5.5 contain different sources...

e.g.
snark/graphics/qt3d/coordinates.h includes Qt3D/qgltexture2d.h, which does not exist in my Qt5.5 installation

[vlaskine]

strange indeed; i am not sure, but i saw it working on linux and certainly without installing qt3d

would you mind to try to do something like?

#ifndef APPLE
#include <Qt3D/qgltexture2d.h>
#endif

[andrew-hill]

coordinates.h includes:

#include <Qt3D/qgltexture2d.h>
#include <Qt3D/qglscenenode.h>                                                                                                                                                 
#include <Qt3D/qglbuilder.h>
#include <Qt3D/qglpainter.h>
#include <Qt3D/qglcylinder.h>

i can #ifdef them all out (none of these files exist anywhere in the 5.5 source from git), but it still won't build due to lack of a definition of QGLSceneNode

In file included from /Users/andrew/Development/snark/graphics/qt3d/coordinates.cpp:33:
/Users/andrew/Development/snark/graphics/qt3d/coordinates.h:49:5: error: unknown type name 'QGLSceneNode'
QGLSceneNode* node() const;

(from a quick look this applies to most of the Qt3D includes and classes used in view-points and label-points)

i've checked the entire 5.5 branch on git for the string "QGLSceneNode" and it only exists in a text file that's the log output from some test (which seems out of date), so I'm actually not sure how you could have built view-points and label-points against Qt5.5

there's not even a Qt3D module for CMake to find anymore when it looks for Qt, so it shouldn't have even got past the cmake configure with Qt5.5

[vlaskine]

hm... this is not a good news; i am pretty sure we built it on a computer that did not have qt3d installed and had qt.5.5

it built, complained a lot during the runtime, but eventually worked

moreover, let me ask @junderwood : i think he recently has installed comma and snark on a fresh linux box and, to my (likely false) memory did not need to install qt3d to have view-points working; @junderwood, could you comment?

[junderwood]

I wanted to build snark against qt5.5 but was unable to easily install qt5.5... No apt get package. I ended up with 5.2 I think. Then, following the snark wiki instructions verbatim I was unable to get snark cmake to recognise qt3d with qt5.2. So following advice from navid or someone, I had to go with qt4 which worked. I have no regrets since then.

I made minor changes to the wiki, but from my own experience the wiki should not even mention qt5.

On 11 Nov 2015, at 5:39 pm, vlaskine <notifications@github.commailto:notifications@github.com> wrote:

hm... this is not a good news; i am pretty sure we built it on a computer that did not have qt3d installed and had qt.5.5

it built, complained a lot during the runtime, but eventually worked

moreover, let me ask @junderwoodhttps://github.com/junderwood : i think he recently has installed comma and snark on a fresh linux box and, to my (likely false) memory did not need to install qt3d to have view-points working; @junderwoodhttps://github.com/junderwood, could you comment?

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/104#issuecomment-155681932.

[vlaskine]

as i said, i have memories of installing qt.5 without qt3d (i think on Mitch's computer)

i guess we will have to reopen this ticket and prioritize fixing view-points and label-points for qt.5.5, which may be weeks of work