QtInteractor CPU usage is based on window size and meshes rendered

[leszeknowakowski]

Hello!

The size of the Qt window with QtInteractor heavily impacts the CPU usage, consuming even up to full 3 threads when multiple meshes are rendered:

QtInteractor2.mp4

The issue happens only on Linux (even on different mechines), when the same code is running on Windows everything is fine.

Have You ever seen something like this?

import sys
import os
os.environ["QT_API"] = "pyqt5"
from qtpy import QtWidgets
import numpy as np
import pyvista as pv
from pyvistaqt import QtInteractor, MainWindow

class MyMainWindow(MainWindow):

    def __init__(self, parent=None, show=True):
        QtWidgets.QMainWindow.__init__(self, parent)

        # create the frame
        self.frame = QtWidgets.QFrame()
        vlayout = QtWidgets.QVBoxLayout()

        # add the pyvista interactor object
        self.plotter = QtInteractor(self.frame)
        vlayout.addWidget(self.plotter.interactor)
        self.signal_close.connect(self.plotter.close)

        self.frame.setLayout(vlayout)
        self.setCentralWidget(self.frame)

        # simple menu to demo functions
        mainMenu = self.menuBar()
        fileMenu = mainMenu.addMenu('File')
        exitButton = QtWidgets.QAction('Exit', self)
        exitButton.setShortcut('Ctrl+Q')
        exitButton.triggered.connect(self.close)
        fileMenu.addAction(exitButton)

        # allow adding a sphere
        meshMenu = mainMenu.addMenu('Mesh')
        self.add_sphere_action = QtWidgets.QAction('Add Sphere', self)
        self.add_sphere_action.triggered.connect(self.add_sphere)
        meshMenu.addAction(self.add_sphere_action)

        if show:
            self.show()

    def add_sphere(self):
        """ add a sphere to the pyqt frame """
        for i in range(10):
            x,y,z = np.random.rand(3)
            sphere = pv.Sphere(center=[x,y,z],radius=0.1)
            self.plotter.add_mesh(sphere)
        self.plotter.reset_camera()


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    window = MyMainWindow()
    sys.exit(app.exec_())

[leszeknowakowski]

Was anyone able to reproduce the bug?