# Interactive Editing of Subsurface Scattering | Two Minute Papers #39

## Метаданные

- **Канал:** Two Minute Papers
- **YouTube:** https://www.youtube.com/watch?v=eI_QUtgJHH8
- **Дата:** 20.01.2016
- **Длительность:** 2:33
- **Просмотры:** 4,742
- **Источник:** https://ekstraktznaniy.ru/video/14888

## Описание

Subsurface scattering is a technique to model light transport not between surfaces, but volumes - it therefore enables rendering digital images of human skin, marble, milk, and many other translucent materials. This piece of work takes this a step beyond, and offers a compelling solution to editing subsurface scattering.

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The paper "Interactive Albedo Editing in Path-Traced Volumetric Materials" is available here:
http://graphics.berkeley.edu/papers/Milos-IAE-2013-02/

Recommended for you:
More on subsurface scattering - https://www.youtube.com/watch?v=qyDUvatu5M8&feature=youtu.be&t=13m2s

Image credits (CC-BY):
https://flic.kr/p/9RCYEw
https://flic.kr/p/38fLAH
https://flic.kr/p/5EP5bw
https://en.wikipedia.org/wiki/Subsurface_scattering#/media/File:Skin_Subsurface_Scattering.jpg

Blender scene file for the burning flame:
http://www.blendswap.com/blends/view/74722

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## Транскрипт

### Segment 1 (00:00 - 02:00) []

Dear Fellow Scholars, this is Two Minute Papers with Károly Zsolnai-Fehér. Subsurface scattering means that a portion of light that hits a translucent material does not bounce back from the surface but penetrates it and scatters many-many times inside the material. Now, if you have a keen eye, you recognize that there are a lot of materials in real life that have subsurface scattering. Many don't know, but our skin is a great example of that, and so is marble, milk, wax, plant leaves, apple and many others. If you would like to hear a bit more about subsurface scattering, check the second part of the video that you see recommended in the corner of this window, or just click it in the description box below. Subsurface scattering looks unbelievably beautiful, but at the same time, it is very expensive because we have to simulate up to thousands and thousands of scattering events for every ray of light. It really takes forever. And if you'd like to tweak your material settings just a bit because the result is not a 100% up to your taste, you have to recreate, or what graphics people like to say, re-render these images. It's not really a convenient workflow. This piece of work offers a great solution where you have to wait a bit longer than you would wait for one image, but only once, because it runs a generalized light simulation, and after that, whatever changes you apply to your materials, you will see immediately. You can also paint the reflectance properties of this material that we call albedos and get results with full subsurface scattering immediately. Here is another interactive editing workflow where you get results instantaneously, and the result with this technique is indistinguishable from the real deal, which would be re-rendering this result image every time some adjustment is made. With this technique, you can really create the materials you thought up in a fraction of the time of the classical workflow. Spectacular work. Thanks for watching and for your generous support, and I'll see you next time!