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流体模拟的风格转换 – 译学馆
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流体模拟的风格转换

Style Transfer For Fluid Simulations | Two Minute Papers #162

亲爱的学霸们 这里是Károly Zsolnai-Fehér带来的两分钟论文
Dear Fellow Scholars, this is Two Minute Papers with Károly Zsolnai-Fehér.
在这一系列中 我们已经看过许多关于模拟液体和烟雾的视频
We’ve seen a lot of fluid and smoke simulations throughout the series.
每个案例都是以将动画的真实感最大化为目的
In each of these cases, the objective was to maximize the realism of these animations,
力求以假乱真
often to the point where they are indistinguishable from reality.
然而有的时候 真实感却不是动画的首要目的
However, there are cases where creating photorealistic footage is not the main objective.
艺术家们常常想要把自己独特的风格渗透于他们所制作的流体和烟雾模拟动画中
Artists often seek to imbue these fluid and smoke simulations with their own distinctive
这种风格并不需要真实感
style, and this style needs not to be photorealistic.
相反 这种动画可以是卡通风格的 黑白的 亦或是颜色丰富多变的
It can be cartoonish, black and white, or take a variety of different color schemes.
但是 想要获得这样一种效果 我们得坐下来 拿一大叠纸
But unfortunately, to obtain such an effect, we have to sit down, get a bunch of papers,
把整个动画一帧一帧地画下来
and draw the entirety of the animation frame by frame.
当然 想要制作这种动画 我们还需要具有物理知识
And of course, to accomplish this, we also need to be physicists and know the underlying
懂得动画背后的流体力学原理
laws of fluid dynamics.
知识浩如烟海 任务无比艰巨
That’s not only borderline impossible, but extremely laborious as well.
所以 要是能有一个算法 能明白我们想要的艺术风格
It would be really cool to have an algorithm that is somehow able to learn our art style
并将其应用于流体和烟雾的模拟动画 就再好不过了
and apply it to a fluid or smoke simulation sequence.
但问题是 我们究竟要如何明确地表达我们想要的风格呢
But the question is, how do we exactly specify this style?
咱们来看看这项技术 我爱极了它背后的理念: 首先我们用电脑制作
Have a look at this really cool technique, I love the idea behind it: first we compute a classical
一个普通的烟雾模拟视频 然后 我们冻结其中几帧 让艺术家给这几帧上色
smoke simulation, then, we freeze a few frames and get the artist to colorize them.
之后 用算法把这几帧的艺术风格复制到整个视频中
After that, the algorithm tries to propagate this artistic style to the entirety of the sequence.
显然 这是流体动画的艺术风格转换方法
Intuitively, this is artistic style transfer for fluid animations,
而且不需要任何机器学习技法
but, without using any machine learning techniques.
我们在这里做的是块匹配的再生变形
Here, we are doing patch-based regenerative morphing.
这个酷炫的术语是指一种技术 它能试图理解流动方向
This awesome term refers to a technique that is trying to understand the direction of flows
并能根据流动方向 用平流输送上色的各区域
and advect the colored regions according to it in a way
使其在视觉和时间上都具有一致性
that is both visually and temporally coherent.
视觉一致 意思是我们尽力让动画看起来真实
Visually coherent means that it looks as close to plausible as we can make it, and temporally
时间一致 意思是我们不单独看每一帧 而是把它们作为一个整体
coherent means that we’re not looking only at one frame, but a sequence of frames, and
连续帧之间的运动一定要流畅连贯
the movement through these neighboring frames has to be smooth and consistent.
这些动画都是由8到9张彩图制成的
These animation sequences were created from 8 to 9 colorized frames, and whatever you
图与图之间的衔接动画都是算法补充进去的
see happening in between was filled in by the algorithm.
再次强调 我们这里主要讨论的是艺术风格 不是模拟本身
And again, we’re talking about the artistic style here, not the simulation itself.
在先进学习算法引领的世界中的一件精美的手工艺品
A fine, handcrafted work in the world dominated by advanced learning algorithms.
这篇论文有点像是电子表时代里的一块精美的机械表
This paper is a bit like a beautiful handmade automatic timepiece in the era of quartz watches.
如果你喜欢这个视频 记得点赞
If you enjoyed this episode, please make sure to leave a like on the video, and don’t forget
别忘了订阅才能收到频道的更新 一周两次更新
to subscribe to get a glimpse of the future on the channel, twice a week.
感谢观看 也感谢你们的大力支持 我们下次见
Thanks for watching and for your generous support, and I’ll see you next time!

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视频概述

并不是所有的流体模拟动画都力求将动画的真实感最大化。这个视频提出了制作不同风格的流体模拟动画的新方法。

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视频来源

https://www.youtube.com/watch?v=wlAgyf_e-hA

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