Summer Solstice

以一只蝴蝶为线，穿起三个不同的三维场景，因为蝴蝶和三个场景的运动需要共用一个摄像机，所以这些场景每个图层都得放到一个合成里，好在最终还是能顺利渲染。

Using a butterfly as a line, thread through three different 3D scenes. As the motion of the butterfly and the three scenes require a common camera, each layer of these scenes needs to be placed in a composite, fortunately, the final rendering can still be smooth.