Example of how to embed a simple USD viewport in Qt application

usdviewport_qt.py

"""
MIT License

Copyright (c) 2019 Roy Nieterau

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""

import sys
from PySide import QtGui, QtCore
from pxr import Usd, UsdUtils, Sdf
from pxr.Usdviewq.stageView import StageView

app = QtGui.QApplication([])

class Widget(QtGui.QWidget):
    def __init__(self, stage=None):
        super(Widget, self).__init__()
        self.model = StageView.DefaultDataModel()
        
        self.view = StageView(dataModel=self.model,
                              printTiming=True)
        
        layout = QtGui.QVBoxLayout(self)
        layout.addWidget(self.view)
        layout.setContentsMargins(0, 0, 0, 0)
        
        if stage:
            self.setStage(stage)
        
    def setStage(self, stage):
        self.model.stage = stage
                              
    def closeEvent(self, event):
        
        # Ensure to close the renderer to avoid GlfPostPendingGLErrors
        self.view.closeRenderer()
        

# Load kitchen set
path = r"path/to/Kitchen_set/Kitchen_set.usd"
with Usd.StageCacheContext(UsdUtils.StageCache.Get()):
    stage = Usd.Stage.Open(path)

window = Widget(stage)
window.setWindowTitle("USD Viewer")
window.resize(QtCore.QSize(750, 750))
window.show()

# Make camera fit the loaded geometry
window.view.updateView(resetCam=True, forceComputeBBox=True)

app.exec_()

Original snippet of this gist updated to PySide2 by Thorsten Kaufmann (originally posted on Academy Software Foundation slack channel)

import sys
from PySide2 import QtGui, QtCore, QtWidgets
from pxr import Usd, UsdUtils, Sdf
from pxr.Usdviewq.stageView import StageView

app = QtWidgets.QApplication([])

class Widget(QtWidgets.QWidget):
    def __init__(self, stage=None):
        super(Widget, self).__init__()
        self.model = StageView.DefaultDataModel()
        
        self.view = StageView(dataModel=self.model)
        
        layout = QtWidgets.QVBoxLayout(self)
        layout.addWidget(self.view)
        layout.setContentsMargins(0, 0, 0, 0)
        
        if stage:
            self.setStage(stage)
        
    def setStage(self, stage):
        self.model.stage = stage
                              
    def closeEvent(self, event):
        
        # Ensure to close the renderer to avoid GlfPostPendingGLErrors
        self.view.closeRenderer()
        

path = r"<path_to_usd>"
with Usd.StageCacheContext(UsdUtils.StageCache.Get()):
    stage = Usd.Stage.Open(path)

window = Widget(stage)
window.setWindowTitle("USD Viewer")
window.resize(QtCore.QSize(750, 750))
window.show()

# Make camera fit the loaded geometry
window.view.updateView(resetCam=True, forceComputeBBox=True)

app.exec_()