paint_uniform_color函数如何定义颜色？

`paint_uniform_color`函数是用于将一个3D引擎中物体的颜色设置为一个随机颜色的函数。在Python中，它的定义如下：

def paint_uniform_color(object: Object3D, color: Optional[Color] = None) -> None:
    """
    Sets the object material to a random color. If a color is given, it will be used instead.
    :param object: The 3D object to paint.
    :param color: Optional. The color to use instead of a random one.
    """
    if color is None:
        color = Color().setHex(random.randint(0, 0xffffff))
    if isinstance(object, Mesh):
        if isinstance(object.material, MultiMaterial):
            for material in object.material.materials:
                material.color.copy(color)
        else:
            object.material.color.copy(color)
    elif isinstance(object, Line):
        object.material.color.copy(color)
    elif isinstance(object, Points):
        object.material.color.copy(color)

其中，`color`参数可以接受一个`Color`对象，该对象的RGB值会被应用于物体的颜色。如果没有提供`color`参数，则会随机生成一个RGB值，并将其应用于物体的颜色。