def register(cls):
        """Register properties and operators corresponding to this panel."""

        bpy.utils.register_class(OpenGLPanelSettings)
        bpy.types.Scene.opengl_panel_settings = PointerProperty(
            type=OpenGLPanelSettings
        )

        bpy.utils.register_class(ExportScreenshotImageOperator)
        bpy.utils.register_class(ExportScreenshotAnimationOperator)
        bpy.utils.register_class(SaveOpenGLRenderImageOperator)
        bpy.utils.register_class(ExportOpenGLRenderImageOperator)
        bpy.utils.register_class(ExportOpenGLRenderAnimationOperator)
Register properties and operators corresponding to this panel.
photogrammetry_importer/panels/view_3d_opengl_panel.py