在PyQt5和OpenGL中使用VBO绘制多个对象？

from PyQt5.QtWidgets import QApplication, QOpenGLWidget
from PyQt5.QtGui import QOpenGLShader, QOpenGLShaderProgram, QOpenGLBuffer, QOpenGLVertexArrayObject
from PyQt5.QtCore import Qt, QTimer
from OpenGL.GL import *

class MyOpenGLWidget(QOpenGLWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.objects = []  # 存储多个对象的列表
        self.timer = QTimer(self)
        self.timer.timeout.connect(self.update)
        self.timer.start(16)  # 设置刷新率为60fps

    def initializeGL(self):
        glClearColor(0.0, 0.0, 0.0, 1.0)  # 设置背景颜色为黑色

    def paintGL(self):
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)  # 清空颜色缓冲区和深度缓冲区
        for obj in self.objects:
            obj.draw()

    def resizeGL(self, width, height):
        glViewport(0, 0, width, height)  # 设置视口大小

    def addObject(self, obj):
        self.objects.append(obj)  # 添加对象到列表中

class MyObject(QObject):
    def __init__(self):
        super().__init__()
        self.vertices = [...]  # 对象的顶点坐标数据
        self.colors = [...]  # 对象的颜色数据
        self.vbo = QOpenGLBuffer(QOpenGLBuffer.VertexBuffer)
        self.vao = QOpenGLVertexArrayObject()

    def initialize(self):
        self.vbo.create()
        self.vbo.bind()
        self.vbo.allocate(self.vertices, len(self.vertices) * 4)  # 分配顶点数据的内存空间
        self.vbo.release()

        self.vao.create()
        self.vao.bind()
        self.vbo.bind()
        glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, None)  # 设置顶点属性指针
        glEnableVertexAttribArray(0)
        self.vbo.release()
        self.vao.release()

    def draw(self):
        self.vao.bind()
        glDrawArrays(GL_TRIANGLES, 0, len(self.vertices))  # 绘制对象
        self.vao.release()

if __name__ == '__main__':
    app = QApplication([])
    window = MyOpenGLWidget()
    obj1 = MyObject()
    obj2 = MyObject()
    # 初始化对象
    obj1.initialize()
    obj2.initialize()
    # 添加对象到窗口中
    window.addObject(obj1)
    window.addObject(obj2)
    window.show()
    app.exec()