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自发光爆炸效果 – 译学馆
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自发光爆炸效果

Self-Illuminating Explosions | Two Minute Papers

亲爱的学霸们 这是由Károly Zsolnai-Fehér带来的两分钟论文
Dear Fellow Scholars, this is Two Minute Papers with Károly Zsolnai-Fehér.
今天我们将要谈论爆炸
Today we’re going to talk about explosions.
更准确地说 设想我们在电脑上已经有了一个爆炸场景的物理仿真数据
To be more precise, imagine that we already have the physics simulation data for an explosion
但我们想要将它在屏幕上可视化
on our computer, but we would like to visualize it on our screen.
这就需要一个光线的仿真程序 它能够创造一幅
This requires a light simulation program that is able to create an image of this virtual
与现实场景看起来完全相同的图像
scene that looks exactly the same as it would in reality.
我们早期的视频中有大量关于光传输的内容 就像你们非常熟悉的那样
We have had plenty of earlier episodes on light transport, and as you know all too well,
这是我最喜欢的话题之一
it is one of my favorite topics.
对此我总觉得不够
I just can’t get enough of it.
我已经把这些相关的节目链接放在视频描述中
I’ve put a link to these related episodes in the video description.
如果要渲染一个巨大的烟流 我们使用一个被图形学专业人群称为
If we wish to render a huge smoke plume, we perform something that computer graphics people
体积光照传输的技术
call volumetric light transport.
这意味着一束光不一定只是从材料的表面反射出来
This means that a ray of light doesn’t necessarily bounce off of the surface of materials, but
还会渗透材料表面 并在材料内部散射
it can penetrate their surfaces and scatter around inside of them.
一种能够处理这个问题的技术叫做体积路径追踪
A technique that can deal with this is called volumetric path tracing, and if we wish to
如果我们用该技术创造一幅爆炸的图像 那么 最好打包点快餐带着
create an image of an explosion using that, well, better pack some fast food because it
因为这很可能会花费好几个小时
is likely going to take several hours.
这张爆炸的图片花费了13个小时 仍然没能完美渲染
The explosion in this image took 13 hours and it is still not rendered perfectly.
但是这种技术能够在20分钟内解决这个问题 几乎是快了40倍
But this technique is able to solve this problem in 20 minutes, which is almost 40 times quicker.
难以置信
Unbelievable.
核心思路在于 这个超级复杂的体积爆炸数据可以
The key idea is that this super complicated volumetric explosion data can be reimagined
作为大批点光源来重新构想
as a large batch of point light sources.
如果我们解决这些点光源之间的光传输问题 我们就能得到一个方案
If we solve this light transport problem between these point light sources, we get a solution
它与原来路径追踪的方法非常相似 然而
that is remarkably similar to the original solution with path tracing, however, solving
解决这个新的课题却要简单得多
this new representation is much simpler.
但那只是第一步
But that’s only the first step.
如果我们有一堆光源 我们可以在它们周围创建一个网格结构
If we have a bunch of light sources, we can create a grid structure around them, and in
通过这些网格点 我们可以用一种高效的方式计算阴影和光照
these gridpoints, we can compute shadows and illumination in a highly efficient manner.
此外 我们还可以创建其中的多个网格结构
What’s more, we can create multiple of these grid representations.
它们的工作都是基于相同的数据 但它们有的更精细 有的显然
They all work on the very same data, but some of them are finer, and some of them are significantly
更稀少、更粗糙
sparser, more coarse.
这里另一个敏锐的观察结果是 尽管在这个精细的网格上
Another smart observation here is that even though sharp, high-frequency illumination
计算锐利、高频光照的细节 将会花费相当多的计算时间
details need to be computed on this fine grid, which takes quite a bit of computation time,
但解决其中一个稀疏网格上的粗糙、低频的细节就足够了
it is sufficient to solve the coarse, low-frequency details on one of these sparser grids.
从地面实况方案来看 结果是难以区分的 但总体计算
The results look indistinguishable from the ground truth solutions, but the overall computation
时间明显减少了
time is significantly reduced.
这篇论文包含了本技术与其它技术的详细比较结果
The paper contains detailed comparisons against other techniques as well.
这些场景的渲染大都使用了数以十万计的点光源
Most of these scenes are rendered using hundreds of thousands of these point light sources,
而正如你所看到的 结果令人难以置信
and as you can see, the results are unbelievable.
如果您想了解更多关于光传输的信息 我正在
If you would like to learn even more about light transport, I am holding a Master-level
奥地利维也纳工业大学开设一个硕士课程
course on this at the Vienna University of Technology in Austria.
我认为这不仅仅是为那些负担得起大学教育的
I thought that the teachings should not only be available for those 30 people who sit in
30个坐在教室里听课的人提供的
the room, who can afford a university education.
它应该适用于所有人
It should be available for everyone.
所以我们做了整个讲座 免费提供给大家
So, we made the entirety of the lecture available for everyone, free of charge, and I am so
我很高兴看到成千上万的人观看了它 到今天为止我收到很多消息
glad to see that thousands of people have watched it, and to this day I get many messages
他们说喜欢它 他们现在能以不同的方式看待世界
that they enjoyed it and now they see the world differently.
这是在与学生一起在教室里实时录音的、没有音频质量保证的
It was recorded live with the students in the room, and it doesn’t have the audio quality
的两分钟论文节目
of Two Minute Papers.
但是 它做得很好的地方 就在于它提升了这些讲座的氛围
However, what it does well, is it conjures up the atmosphere of these lectures and you
几乎可以感受到 你就像是坐在那里的学生之一
can almost feel like one of the students sitting there.
如果你有兴趣 看一看 链接在视频描述中可用!
If you’re interested, have a look, the link is available in the video description!
而且 请务必阅读这篇论文 它是难以置信的
And make sure to read this paper too, it’s incredible.
感谢您的观看和慷慨支持 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

本期的两分钟论文是关于爆炸场景中的光照效果渲染。

听录译者

收集自网络

翻译译者

B11101001

审核员

知易行难

视频来源

https://www.youtube.com/watch?v=jDxsGW5KUP0

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