Stop-Motion Animation
simulation by illusion

Calculus is about two concepts: differentiation (微分) and integration (積分). Differentiation is to chop up a smooth curve into tiny tangent parts. Integration is the reverse: stitching up the tiny tangent parts back into a smooth curve.

What does movie making have to do with the math of calculus?

微積分的數學,涵蓋兩個概念:微分與積分。微分,是將平滑的曲線切換成細微的切線部分。積分則相反,是將細微切線部件縫合成平滑的曲線。

電影製作與數學微積分,有什麼關係?

Movie and Animation 電影與動畫

Well, a movie works frame by frame. You perceive motion in a movie, but nothing is moving in a frame. Effectively, you watch a movie by integration, inside your head. Thus a movie is created by differentiation: shooting each frame.

That is the purpose of a movie camera: actors keep moving, the camera keeps clicking, getting each frame.

Besides live action, there are animations: artists just draw frame by frame. This was how the Disney cartoons started. Nowadays, we use computer animations, like the Toy Story from Pixar, or Shrek from Dreamworks.

Other than image animations, there is also stop-motion animation. Instead of drawing Mickey Mouse, you make a Mickey Mouse, say out of clay. Nudge the clay Mickey into various postures, and keep taking photos using your smartphone. If you are patient enough, you can make a video by integrating your Micky photos!

Of course, this is an extremely tedious process. This is especially true if the final result is a full-length movie of 100+ minutes!【A1】【A2】【A3】

However, this method can create a fantasy world: creatures out of this world flying around, the sky in colors you haven't seen, and characters doing impossible things.

On the other hand, the fantasy world must still be credible: creatures exist in proportions, there are sky and water (although not real sky nor real water), characters look real, and act within imagination.

That's the challenge of making a stop-motion animation. Nowadays, the 3D models for filming are not made from clay for nudging. Instead, they are 3D printed with variations, and catalogued into a vast model library for the animators to pick.

It is breath-holding work to snap frame by frame of 3D models, often small for fast printing. Yet the reward is breathtaking: an animation full of life!

要知道:一部電影,由一格一格的畫面組成。感覺上,電影畫面流暢,但其實每一格畫面沒有動靜。講真的,觀看電影,是在腦海中進行積分。而製作電影,則是進行微分:拍攝每一格。

這就是影片攝影機的目的:演員不斷移動,鏡頭一直拍攝,取得每一格畫面。

除了現場表演外,還有動畫表述:繪畫家一格一格的繪製畫面。這就是迪士尼(Disney)卡通片的起源。現今,動畫是使用電腦繪製,就像皮克斯(Pixar)的《玩具總動員》(Toy Story),或是夢工廠(Dreamworks)的《怪物史萊克》(Shrek)。

除圖像動畫外,還有定格動畫。不用繪製米奇老鼠,而是用粘土製作一個米奇老鼠。將粘土米奇微調到各種姿勢,然後不斷使用智能手機拍照。如果有足夠的耐性,可以集成米奇的照片,用來製作視頻!

當然,這是一個非常費時的過程。如果最終要製作全長100多分鐘的電影,更是不勝其煩!【A1】【A2】【A3】

雖然如此,這方法可以創建一個夢幻世界:奇形怪誕的人物飛來飛去,有從未見過的天空顏色,並且角色做到不可能的事。

另一方面,就算是天馬行空,也不能太離譜:人物大小要合符比例,有天空和水(雖然不是真正的天空,也不是真正的水),角色有血有肉,行動並不太誇張。

這就是製作定格動畫的挑戰。如今,用於拍攝的3D模型,不是用黏土製成。相反,它們是用3D打印,每個印品都有細微的差異,並編目到一個大型的模型庫中,以便動畫師挑選。

模型通常很小巧,以便快速打印。因此逐格拍攝3D模型是令人屏息的工作。然而,效果令人嘆為觀止:一齣充滿生命、栩栩如生的動畫!

Kubo and the Two Strings (2016) 酷寶:魔弦傳說 (Kubo and the Two Strings, 2016)

Kubo and the Two Strings 2016, from Laika. Click to enlarge (click again to close)
來自 Laika,2016年《酷寶:魔弦傳說》。 點擊放大(再擊關閉)
Download【M1】

Everyone has two strings, tie to the first two words every baby learns. Adding his own string, the main character Kubo plays magic with his Japanese three-string instrument, a shamisen (三味線).

Kubo and the Two Strings is a spectacular example of stop-motion animation from Laika【B1】.

You'll see a boat tossing in a wild storm, but in fact there is no wind, no rain, no water, no waves. Nothing moves: the boat, the people, their faces, their hair. Only light, while sound is added afterwards. Everything is static when the animators take each frame -- stops make motion!

Imagine the technical challenges in creating models for the following scenes:

For answers, marvel at these snapshots【B2】【B3】【B4】【B5】【B6】. The story is dynamic, but everything is static; that's magic!
下載【M1】

每個人都有兩根生命弦線,維繫我們牙牙學語時,最早學會的兩個字。主角 Kubo 加上自己的弦線,彈奏他的日本三弦琴(三味線),發揮魔幻法術。

《酷寶:魔弦傳說》是定格動畫的壯觀示例,作品出自 Laika(萊卡)動畫工作室【B1】。

你會看到一艘船在狂風暴雨中折騰,但實際上沒有風,沒有雨,沒有水,沒有波浪。什麼都沒有動作:船,人,他們的臉,他們的頭髮。 只有光線,在後方添加了聲音。當動畫師拍攝每格時,一切都是靜態 --- 定格製作動感!

想像一下,如何搭建場景模型,迎接以下的技術挑戰:

想知答案,參看這些令人讚嘆的視頻片段【B2】【B3】【B4】【B5】【B6】。情節是動態的,但一切都是靜態的:真是魔法!

The Art of Kubo and the Two Strings (Emily Haynes, 2016) 酷寶:魔弦傳說之藝術 (2016年 Emily Haynes)

A fully illustrated book of the movie. Click to enlarge (click again to close)
完整電影插圖書。 點擊放大(再擊關閉)
Book site, Download (165 pages)

This fully illustrated book is fascinating. The creators of "Kubo and the Two Strings" reveal the inventiveness and painstaking work they poured into creating Kubo’s world and his odyssey. With concept art, puppets, props, and set photos on every page, and with insights from the filmmakers and artists themselves, this is a lovingly curated behind-the-scenes look at the making of the film.

原書,下載 (165頁)

本插圖書包羅萬有,引人入勝。其中《酷寶:魔弦傳說》的創作者,展示他們為創造 Kubo 的世界和他的傳奇,因而傾注的想像力及艱辛工作。每頁有概念藝術、木偶、道具和佈景照片,以及電影製片人和藝術家本身的見解,是精心策劃的電影製作幕後花絮。

While My Guitar Gently Weeps

This soundtrack is a famous Beatles song, written by George Harrison. The lyrics start with the following:
I look at you all
See the love there that's sleeping
While my guitar gently weeps.

What follows are random imagery about love -- the kind of "world love" that matters to George Harrison. This song shows his talent in songwriting, trying to rhyme various words in the style of Bob Dylan. The result is a rhythmic song with simple lyrics, easy to follow, with fantastic guitar accompaniment.

'Kubo and the Two Strings' takes this song with a twist: putting "love" to refer to a child. Thus it becomes a song from a mother to a child, replacing the guitar by the shamisen (三味線), a traditional Japanese string instrument.

The soundtrack features Regina Spektor【C1】, a Russian-born American singer-songwriter with classical training on the piano. Her rendition of this Beatles' classic in the end credit song is majestic【C2】.

本片配樂用上一首披頭四著名歌曲,由 George Harrison(喬治·哈里森)撰寫。歌詞開首是:
I look at you all
See the love there that's sleeping
While my guitar gently weeps.

跟著便是關於「愛」的隨機描繪 -- 這是「世界的愛」,也是 George Harrison 的信念。這首歌展示了他在歌曲創作方面的才華,嘗試用 Bob Dylan 的風格作歌詞押韻。結果是一首旋律簡單、歌詞易於上口的佳作,兼具美妙的結他伴奏。

此曲在《酷寶:魔弦傳說》中,來一個華麗轉身:「愛」比喻孩子,變為一首母愛之歌,更以傳統的日本弦樂器:三味線,取代西洋結他。

電影歌曲原聲帶,由 Regina Spektor 演唱【C1】。她是來自俄羅斯的美國創作歌手,曾接受古典鋼琴訓練。作為片尾曲,這首披頭四的經典,她演繹得相當壯麗【C2】。