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用高分辨率渲染逼真的毛皮 – 译学馆
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用高分辨率渲染逼真的毛皮

Photorealistic Fur With Multi-Scale Rendering | Two Minute Papers #183

亲爱的学者们 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.
创建带有皮毛和毛发的逼真图像并不容易
Creating a photorealistic image with fur and hair is hard.
我们通常使用光仿真程序 用物理规律来
It is typically done by using light simulation programs where we use the laws of physics
模拟一个场景中从不同物体上反射出的数百万条
to simulate the path of millions and millions of light rays as they bounce off of different
光线路径
objects in a scene.
如果幸运的话 它通常需要数分钟到数小时
This typically takes from minutes to hours if we’re lucky.
然而 一些材料的存在 比如皮毛和毛发使得问题更加
However, in the presence of materials like hair and fur, this problem becomes even more
困难 因为皮毛纤维具有内部散射介质
difficult, because fur fibers have inner scattering media.
这意味着不仅要从物体表面反射光线
This means that we not only have to bounce these rays off of the surface of objects,
同时还要模拟光线在皮毛内层间的透射
but also have to simulate how light is transmitted between these inner layers.
首先 从一幅有噪声的图像开始 当我们在模拟中计算的光线数量越多
And initially, we start out with a noisy image, and this noise gets slowly eliminated as we
噪声就会被慢慢消除
compute more and more rays for the simulation.
spp表示每像素的样本数
Spp means samples per pixel,
就是对于图像中的每个像素我们所计算的光线数量
which is the number of rays we compute for each pixel in our image.
在前一个技术中使用256spp将导致高噪声的图像
And you can see that with previous techniques, using 256 samples per pixel leads to a very
我们就需要明显更多的时间来使图像变得清晰 收敛
noisy image and we need to spend significantly more time to obtain a clear, converged image.
这个新技术让我们能从样本中获得最大的输出
And this new technique enables us to get the most out of our samples,
如果我们用256spp渲染图像
and if we render an image with 256 spp,
我们可以得到与前一技术使用6倍样本时大致相当
we get a roughly equivalent quality to a previous technique
的图像质量
using around six times as many samples.
如果我们拥有电影工作室 有人过来说制作下一部
If we had a film studio and someone walked up on us and said that we can render the next
《银河护卫队》电影能便宜六倍 我们当然完全同意
Guardians of The Galaxy film six times cheaper, we’d surely be all over it.
这将为我们省下数百万美元
This would save us millions of dollars.
它主要的卖点是为皮毛和毛发的渲染引入了多尺度模型
The main selling point is that this work introduces a multi-scale model for rendering hair and fur.
这意味着它能分别计算近场和远场的散射
This means that it computes near and far-field scattering separately.
远场散射模型包含简化 意味着它的计算速度更快
The far-field scattering model contains simplifications, which means that it’s way faster to compute.
它做了充分地简化 类似从远处观察一个毛发模型 或者
This simplification is sufficient if we look at a model from afar or we look closely at
从近处观察一个比人类头发细得多的毛发模型
a hair model that is way thinner than human hair strands.
近场模型更加忠实于真实 同时计算成本也更加昂贵
The near-field model is more faithful to reality, but also more expensive to compute.
最后并且最重要的难题是 如何结合这两者 无论何时我们
And the final, most important puzzle piece is stitching together the two: whenever we
远离它都应该采用远场模型 仅当视觉差别很大时
can get away with it, we should use the far-field model, and compute the expensive near-field
才使用计算成本昂贵的近场模型
model only when it makes a difference visually.
还有一件事 当仓鼠靠近或远离镜头时 我们
And one more thing: as these hamsters get closer or further away from the camera, we
需要保证切换模型时没有令人讨厌的跳跃
need to make sure that there is no annoying jump when we’re switching models.
如你所见 动画黄油般顺滑 我们观察时能看到漂亮的
And as you can see, the animations are buttery smooth, and when we look at it, we see beautiful
渲染图像 若我们对理论一无所知 我们就不能
rendered images, and if we didn’t know a bit about the theory, we would have no idea about
理解其背后的多尺度魔法
the multi-scale wizardry under the hood.
出色的工作
Excellent work.
论文同样包含了一系列的光路分解 比如 这里
The paper also contains a set of decompositions for different light paths, for instance, here,
你能看到左边一幅完全渲染的图像 以及光反射
you can see a fully rendered image on the left, and different combinations of light
和透射事件的不同组合
reflection and transmission events.
例如R代表光反射 TT代表两个透射事件等等
For instance, R stands for one light reflection, TT for two transmission events, and so on.
上标的S表示光散射事件
The S in the superscript denotes light scattering events.
综合所有可能的T和R组合
Adding up all the possible combinations of these Ts and Rs,
我们就得到了左边的逼真图像
we get the photorealistic image on the left.
真的很酷 喜欢它!
That’s really cool, loving it!
如果你想更多地了解光仿真 我正在维也纳工业大学
If you would like to learn more about light simulations, I am holding a full master-level
开设一个相关的全硕士课程
course on it at the Technical University of Vienna.
这一课程的全部内容对所有人都是免费的
And the entirety of this course is available free of charge for everyone.
我从反馈中得知 大家观看了课程并且相当喜欢它
I got some feedback from you Fellow Scholars that you watched it and enjoyed it quite a bit.
试一下吧!
Give it a go!
如往常一样 具体内容请看视频描述
As always, details are available in the video description.
感谢你们的观看和慷慨支持 下次再见!
Thanks for watching and for your generous support, and I’ll see you next time!

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视频概述

针对皮毛和毛发的用高分辨率渲染逼真图像

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视频来源

https://www.youtube.com/watch?v=qKhSZmS6aWw

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