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動画の字幕をクリックしてすぐ単語の意味を調べられます!
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字幕の修正報告
Hi, I'm Hayley Iben
I'm a software engineer at Pixar.
I worked on the hair simulator
for the movie, Brave.
Hair was a really big deal in Brave.
It was a symbol of freedom that was intrinsic
to our main character Merida's personality.
And making hair that feels right,
meaning messy, wild and free,
is a hard thing to do computationally.
In our movies, hair is a simulated effect.
That means no one animates its movement by hand.
The way it moves is defined by physics
and programmed into the computer.
To figure out what hair simulation should look like,
we needed to look at real curly hair
and see how it worked.
What we found was this.
Curly hair forms together in locks
that reshape themselves when you pull on them,
kind of like a spring.
This was great news because springs
can be modeled mathematically,
meaning we can simulate their behavior
using a computer program.
From the computer's perspective,
Merida's hair is just lots and lots of springs
that react to forces, such as gravity,
as Merida moves.
The tests we ran using this approach were pretty good,
but not quite natural enough.
While stiffer springs held the shape of the curl,
it didn't bounce like natural curls.
When we made the springs loser,
her curls would unwind when she moved.
This was even more obvious at high,
often unrealistic speeds, found in animation.
We realized we needed something
to preserve the structure of the curl,
but not impede the overall motion of the hair,
kinda like digital hairspray.
(can hissing) Oh, sorry (laughs).
We came up with the idea of connecting
the springs that make up Merida's on-screen hair
to invisible core springs like this.
The core springs would limit the movement
of the on-screen hair
when the motion was more extreme.
This way, we could have the best of both worlds.
Our original simulation we create motion
that was soft and natural,
but the core springs would keep the curl
from unwinding too much.
Figuring out how to make a hair simulation system
that could help us achieve the feeling we wanted
for Merida's hair was hard.
It took a lot of iterations to get it right,
but it made a big difference.
Merida feels like a real girl,
messy, wild and free.
コツ:単語をクリックしてすぐ意味を調べられます!

読み込み中…

Computer Simulation (Pixar in a Box)

110 タグ追加 保存
April Lu 2019 年 3 月 15 日 に公開
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  1. 1. クリック一つで単語を検索

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