For the average Houdini user, are there any noticeable differences between the QT4 & QT5 builds?

I,e - “This works in one but not the other” or “This feature is faster in one than the other”

For one, I'm pretty sure high DPI monitor support is much better in the QT5 version.

Hi Luke,

The feature sets in the Qt4 and Qt5 builds are the same.

And in theory you should have the same general user experience in both builds however since the Qt5 build is much newer than the Qt4 one there are more issues (UI-related) that need to be ironed out of it.

One area where you will notice a big difference between Qt4 and Qt5 is with Python Panel development. The Qt4 builds require that you use PySide/PyQt4 for building UI in Python Panels while the Qt5 builds require that you use PySide2/PyQt5. The same goes for building standalone Python UI in Houdini. And similarly for building C++ UI in the HDK.

My suggestion is to start with the Qt5 build and fallback to Qt4 only if you run into strange UI issues that make Houdini unusable. Though if you fallback to Qt4 please submit bug reports for the Qt5 problems so that we can fix them for later releases.

I hope this helps.

Cheers,
Rob

Thanks for the info Rob!

The only reason I asked was because the Vray beta just added R16 compatibility today, but only for the Qt4 build - and I wasn't sure what issues (if any) I'd run into throughout my day-to-day work.

From what it sounds like, I should be good to go.

Also Qt5 build works better with tablet, much like with mouse.

I can not start Qt5 build on KDE Neon which has latest Qt libraries…

SreckoM
I can not start Qt5 build on KDE Neon which has latest Qt libraries…

Can't try linux version this time, but I think there is a problem with environment variable where you should override Qt libraries path to houdini folder.

Try to add this line to /home/user/houdini16.0/houdini.env:

Or google for something like “override environment variables in linux”

vux

SreckoM
I can not start Qt5 build on KDE Neon which has latest Qt libraries…

Can't try linux version this time, but I think there is a problem with environment variable where you should override Qt libraries path to houdini folder.

Try to add this line to /home/user/houdini16.0/houdini.env:

LD_LIBRARY_PATH = /path/to/your/houdini/bin/folder

Or google for something like “override environment variables in linux”

Hi,

I had the same problem (only with Qt5 build) but in my case it was issues with OpenGL context,
reinstall graphics card driver helped.

Cheers
Ostap

Thanks for answer, I figured out it is issue with 378 Nvidia drivers. What drivers you use?

SreckoM
Thanks for answer, I figured out it is issue with 378 Nvidia drivers. What drivers you use?

Nvidia driver is 375.26.
Looks like it wasn't driver fall, it was just my playing with virtualGL where I beat couple of libs.

For me it is driver. 378 does not want to start, 375 works perfectly.

It works nicely with latest 381 drivers.

Qt5 is well cooked for me; I'm trying to run multiple monitors with large DPI on Linux. Qt4 seems solid UI wise.