VFX Reference Platform A Common Target for Building VFX Software Experience Porting to Qt5 / PyQt5 Mark A. McLaughlin Walt Disney Animation Studios

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Motivation • VFX Reference Platform CY2016
 • Maya 2017
 • Houdini 16

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Concerns • Memories of Qt3 —> Qt4 Port


• Significant Undertaking for Vendors


• Limited Amount of Time/ Bandwidth

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Staged Approach 1. Clean up old code and products 2. Update C++ Qt4 / PyQt4 code • Deprecated features • Includes and imports • New-style signals and slots • SIP API 2.0: QString / QVariant / QSettings 3. Convert to Qt5 / PyQt5 ©DISNEY

Experience • Detailed documentation of process and issues • C++ conversion easier than Python • Top Issue: PyQt new-style signals and slots • Majority of changes • Uncovered several bugs • Not too bad so far, but still not done • Some difficulties with QStyles, Phonon, OpenGL, PyQt crash on exit ©DISNEY

pyqt4topyqt5 • Open Source: https://github.com/rferrazz/pyqt4topyqt5 • A lifesaver for converting PyQt code • Made extensive modifications to conversion script • PyQt4 update ability • Better handling of signals / slots • Better handling of QChar / QString / QVariant • Many bug fixes and minor updates ©DISNEY

Our changes are available to everyone!

©DISNEY

What I Wished I Had Known/Done • Started using PyQt new-style signals and slots long ago • Learned about the SIP API 2.0 • Removed usage of deprecated features • Understood just how much Qt/PyQt code we had • Knew that the conversion was not going to be that bad

©DISNEY

VFX Reference Platform -

VFX Reference Platform CY2016. • Maya 2017. • Houdini 16. Motivation ... C++ conversion easier than Python. • Top Issue: PyQt new-style signals and slots.
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