Question

我们可以使用QWidget.createWindowContainer将3D视图添加到QMainWindow（带有菜单，状态栏等的窗口）。

然而，我发现这种方法不起作用，Windows打开但无法呈现3D内容。

它还会显示错误

QOpenGLContext::swapBuffers() called with non-exposed window, behavior is undefined

以下示例代码将此方法与本机PyQt3D（无法使用QWidgets构建完整的UI）进行比较

from PyQt5.QtWidgets import QMainWindow, QAction, QApplication, QWidget, QPushButton, qApp, QLabel, QHBoxLayout, QVBoxLayout, QSplitter
from PyQt5.QtGui import QIcon, QPixmap, QPainter, QImage, QMatrix4x4, QQuaternion, QVector3D, QColor, QGuiApplication
from PyQt5.QtCore import QSize, Qt
import sys
from PyQt5.Qt3DCore import QEntity, QTransform, QAspectEngine
from PyQt5.Qt3DRender import QCamera, QCameraLens, QRenderAspect
from PyQt5.Qt3DInput import QInputAspect
from PyQt5.Qt3DExtras import QForwardRenderer, QPhongMaterial, QCylinderMesh, QSphereMesh, QTorusMesh, Qt3DWindow, QOrbitCameraController

class View3D(QWidget):
    def __init__(self):
        super(View3D, self).__init__()
        self.view = Qt3DWindow()
        self.container = self.createWindowContainer(self.view)

        vboxlayout = QHBoxLayout()
        vboxlayout.addWidget(self.container)
        self.setLayout(vboxlayout)

        scene = createScene()

        # Camera.
        initialiseCamera(self.view, scene)

        self.view.setRootEntity(scene)

def initialiseCamera(view, scene):
    # Camera.
    camera = view.camera()
    camera.lens().setPerspectiveProjection(45.0, 16.0 / 9.0, 0.1, 1000.0)
    camera.setPosition(QVector3D(0.0, 0.0, 40.0))
    camera.setViewCenter(QVector3D(0.0, 0.0, 0.0))

    # For camera controls.
    camController = QOrbitCameraController(scene)
    camController.setLinearSpeed(50.0)
    camController.setLookSpeed(180.0)
    camController.setCamera(camera)

def createScene():
    # Root entity.
    rootEntity = QEntity()

    # Material.
    material = QPhongMaterial(rootEntity)

    # Torus.
    torusEntity = QEntity(rootEntity)
    torusMesh = QTorusMesh()
    torusMesh.setRadius(5)
    torusMesh.setMinorRadius(1)
    torusMesh.setRings(100)
    torusMesh.setSlices(20)

    torusTransform = QTransform()
    torusTransform.setScale3D(QVector3D(1.5, 1.0, 0.5))
    torusTransform.setRotation(
            QQuaternion.fromAxisAndAngle(QVector3D(1.0, 0.0, 0.0), 45.0))

    torusEntity.addComponent(torusMesh)
    torusEntity.addComponent(torusTransform)
    torusEntity.addComponent(material)

    # Sphere.
    sphereEntity = QEntity(rootEntity)
    sphereMesh = QSphereMesh()
    sphereMesh.setRadius(3)

    sphereEntity.addComponent(sphereMesh)
    sphereEntity.addComponent(material)

    return rootEntity

class Application(QMainWindow):
    def __init__(self):
        super().__init__()
        #
        view3d = View3D()
        self.setCentralWidget(view3d)
        self.show()

# Approach 1 - Integrate Qt3DWindow into a QMainWindow
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Application()
    sys.exit(app.exec_())

'''
# Approach 2 - A native Qt3DWindow
if __name__ == '__main__':
    app = QGuiApplication(sys.argv)
    view = Qt3DWindow()

    scene = createScene()
    initialiseCamera(view, scene)

    view.setRootEntity(scene)
    view.show()

    sys.exit(app.exec_())
'''

有关如何正确使用QWidget.createWindowContainer将3D视图添加到经典QMainWindow的任何想法？

Answer 1

在方法1中，"方法结束后，View3D中的scene变量将超出范围。然后，它会被Python垃圾收集，什么也没显示。

在方法2中，__init__()仍在程序执行的整个范围内，因此没有问题。

我将scene中出现的scene的三个实例更改为__init__()，从而保留了对其的引用。方法1和方法2现在都可以按预期工作。

方法1仍然出现错误

self.scene

但它似乎不会引起问题。

将PyQt3D窗口集成到QMainWindow中

1 个答案: