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光在镜面微结构的传输 – 译学馆
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光在镜面微结构的传输

Light Transport on Specular Microstructure | Two Minute Papers #193

亲爱的学者们 欢迎来到Károly Zsolnai-Fehér的两分钟精选
Dear Fellow Scholars, this is Two Minute Papers with Károly Zsolnai-Fehér.
通过光模拟程序 我们能够用对象填充虚拟场景
Using light simulation programs, we are able to populate a virtual scene with objects,
为它们制作材料模型 产生一幅美丽逼真的
assign material models to them, and create a beautiful, photorealistic image of this
数字场景图
digital scene.
光传播理论符合光的物理原理 这使得图像和现实很难区分
The theory of light transport follows the physics of light, therefore these images should
通常情况下的确是这样
be indistinguishable from reality, and fortunately, they often are.
然而 某些情况下真假还是能区分的
However, there are some cases when we can tell them apart from real images.
其原因并不是光传播算法的误差问题
And the reason for this is not the inaccuracies of the light transport algorithm, but the
而是对几何材料模型的过度简化
oversimplifications used in the geometry and material models.
主要问题是 在我们的数字模型中 这些材料通常被定义的
The main issue is that in our mathematical models, these materials are often defined
过于完美
to be too perfect.
然而事实呢 金属并不是绝对的光滑 经典的光传输材料模型几乎不能捕捉到
But in reality, metals are rarely perfectly polished, and the classical material models
这些使得表面不完美的微小结构
in light transport can rarely capture these microstructures that make surfaces imperfect.
该算法是用来渲染一种新的材料模型 它可以表现出划开的涂层
This algorithm is about rendering new material models that can represent the imperfect materials
以及汽车漆上的金属颗粒 皮革沙发 木地板甚至茶壶等
like scratched coating and metallic flakes on carpaint, a leather sofa, wooden floor,
不完美的材料
or a teapot.
看看这些惊人的图像吧
Just look at these phenomenal images.
之前也有技术能解决这个问题 但要花费相当长的时间
Previous techniques exist to solve this problem, but they take extremely long and are typically
而且通常仅限于光滑的表面
limited to flat surfaces.
这个问题的主要困难之一是这些小颗粒和划痕
One of the main difficulties of the problem is that these tiny flakes and scratches are
通常比像素小一个数量级 所以 需要更加细心
typically orders of magnitude smaller than a pixel, and therefore they require a lot
以及额外的运算来渲染它
of care and additional computations to render.
论文提供了一个精确的 封闭式的 高效渲染方案
This work provides an exact, closed-form solution to this that is highly efficient to render.
它比之前的技术至少快100倍 且在曲面上应用的限制更小了
It is over a hundred times faster than previous techniques, has less limitations as it works
而且与标准的完美材料模型相比
on curved surfaces, and, it only takes 40% longer to render it compared to the standard
它只需多耗费40%的时间
perfect material models.
只需要多40%的时间吗
Only 40% more time for this?
偶像我要签名!
Sign me up!
我们用科学创造出这种复杂的图像真的令人难以置信
It is truly incredible that we can create images of this sophistication using science.
它还可以直接作为标准的材料模型来使用
It is also highly practical as it can be plugged in as a standard material model without any
不用对程序做太大的改动 这非常的好用
crazy modifications to the simulation program.
期待在不久的将来 能看到一些使用更加现实的材料模型
Looking forward to seeing some amazing animations using more and more realistic material models
制作的奇异的动画
in the near future.
如果你想了解更多关于光模拟的知识 我已经在维也纳大学技术学院
If you would like to learn more about light simulations, I have been holding a full master-level
教了几年的硕士课程了
course on it at the Technical University of Vienna for a few years now.
后来 我就有一种强烈的感觉 这些课程不应该
After a while, I got a strong feeling that the teachings shouldn’t only be available
只属于负担得起大学教育的这30个幸运的人
for the lucky 30 people in the classroom who can afford a college education.
它们应该是每个人都可以学习的
The teachings should be available for everyone.
现在 这门课的全部内容对我们每个人都是免费的
And now, the entirety of this course is available free of charge for everyone where we learn
在这里 我们从零开始学习光理论 并实现一个非常酷的光模拟程序
the theory of light from scratch and implement a really cool light simulation program together.
如果你想和我一起解几个多重积分 试试看!
If you want to solve a few infinite dimensional integrals with me, give it a go!
和往常一样 视频中有详细的描述
As always, details are available in the video description.
感谢观看和慷慨支持 下期再见!
Thanks for watching and for your generous support, and I’ll see you next time!

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举例说明了光在镜面微结构传播的事例以及原理

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视频来源

https://www.youtube.com/watch?v=GNx8rgNcw5c

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