如何通过LWJGL绘制立方体？

Question

我正在尝试在OpenGL（LWJGL）中绘制立方体，就像我对quad所做的那样（并且可以工作），但是它只能绘制一个闪烁的黄色正方形。在Internet上，我仅发现了一些带有顶点部分的示例，并试图从中进行创建，但未成功。我在哪里错了？

    ...
    private fun drawCube(size: Float){
        val half = size / 2

        GL11.glTranslatef(0f,0.0f,-7f)
        GL11.glRotatef(45f,0.0f,1.0f,0.0f)
        GL11.glColor3f(0.5f,0.5f,1.0f)

        GL11.glBegin(GL11.GL_QUADS)

        GL11.glColor3f(0f,0f,1f)
        GL11.glVertex3f(-half, -half, -half)
        GL11.glVertex3f(-half, size - half, -half)
        GL11.glVertex3f(size - half, size-half, -half)
        GL11.glVertex3f(size - half, -half, -half)
        // the same for other 5
        GL11.glEnd()
    }

    private fun loop(){
        GL.createCapabilities()
        while (GLFW.glfwWindowShouldClose(window).toInt() == GLFW.GLFW_FALSE) {
            GL11.glClearColor(colorMain[0], colorMain[1], colorMain[2], 0.0f)
            GL11.glClear(GL11.GL_COLOR_BUFFER_BIT or GL11.GL_DEPTH_BUFFER_BIT)
            render()
            GLFW.glfwSwapBuffers(window)
            GLFW.glfwPollEvents()
        }
    }
...