Houdini 18全新Karma渲染器介绍Shading Theory with Karma

Shading Theory with Karma _ Introduction

Get started with an introduction to the lessons and explore the shaderbot scene file that will be used to create the materials. The shaderbot includes a series of switch nodes for choosing different backdrops, HDRIs and Key Light setups to make it easy to examine how each material looks.
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/
谷歌翻译：
开始介绍课程，并探索将用于创建材质的shaderbot场景文件。 shaderbot包含一系列开关节点，用于选择不同的背景，HDRI和“关键灯光”设置，从而可以轻松检查每种材质的外观。
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/

Shading Theory with Karma _ Part 1 _ Diffuse Reflection

This lesson dives into Diffuse Reflection and compares how this concept is usually taught to how it really works at the atomic level. You will then learn how the Principled Material handles diffuse reflections when rendering with Karma.
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/
谷歌翻译：
本课将深入探讨“漫反射”，并将通常讲授的概念与它在原子级上的实际作用进行比较。然后，您将学习使用Karma渲染时，“原则材料”如何处理漫反射。
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/

Shading Theory with Karma _ Part 2 _ Specular Reflection

This lesson will explore reflections in the real world including dielectrics, semi-conductors, & metals. You will gain an understanding of metallic and specular reflections including Fresnel effects where specular reflections occur at grazing angles.
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/
谷歌翻译：
本课将探讨真实世界中的反射，包括电介质，半导体和金属。您将了解金属和镜面反射，包括菲涅耳效应，其中在掠射角发生镜面反射。
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/

Shading Theory with Karma _ Part 3 _ Roughness & Absorption

Learn what roughness means for diffuse reflections along with how roughness changes specular lobes. Explore the relationship between Fresnel and roughness and learn about absorption and best practices for albedo parameters. These concepts will then be tested on the principled material using the shaderbot.
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/
谷歌翻译：
了解粗糙度对漫反射的含义以及粗糙度如何改变镜面波瓣。探索菲涅耳和粗糙度之间的关系，并了解反照率参数的吸收和最佳实践。这些概念随后将使用shaderbot在原理性材料上进行测试。
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/

Shading Theory with Karma _ Part 4 _ Shading Exercises

Starting with a collection of images, you will learn how to pick colors from each reference along with when to use the Metallic parameter and where to find the IOR of a metal on the web. By researching and analyzing reference, you can achieve the look you need for each material. This lesson also explores smooth dielectrics and how to sample metals.
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/
谷歌翻译：
从图像集合开始，您将学习如何从每个参考中选择颜色以及何时使用Metallic参数以及在网上查找金属的IOR的位置。通过研究和分析参考，可以实现每种材料所需的外观。本课还探讨了平滑的电介质以及如何对金属进行采样。
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/

Shading Theory with Karma _ Part 5 _ Texture Maps, Anisotropy, Sheen and Clear Coat

This lesson continues the creation of the real life materials. Here you will learn how to use texture maps with the Principled Material and best practices for using bump maps. Next you will explore the use of anisotropy, sheen and the basics of coat settings.
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/
谷歌翻译：
本课继续创建现实生活中的材料。在这里，您将学习如何在“原理性材料”中使用纹理贴图以及使用凹凸贴图的最佳实践。接下来，您将探索各向异性，光泽和外套设置基础知识的使用。
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/

Shading Theory with Karma _ Part 6 _ Transparency

Learn how to achieve realistic transparency. This involves setting proper refraction & reflection limits to suit your model. Learn why light bends with transmission and what IOR [index of refraction] can do for the 3D artist. You will also talk how Dispersion affects the transparent look of your shader even though this feature along with nested dielectrics are not yet supported in Karma.
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/
谷歌翻译：
了解如何实现现实的透明度。这涉及设置适当的折射和反射限制以适合您的模型。了解光为何会随着透射而弯曲，以及IOR（折射率）对3D艺术家的作用。您还将讨论色散如何影响着色器的透明外观，即使Karma尚不支持此功能以及嵌套的介电层。
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/

Shading Theory with Karma _ Part 7 _ Subsurface Scattering

Here you will learn the difference between diffuse and subsurface reflections. Starting with a real-world analysis of subsurface/diffuse objects, you will then learn how in CG you can use either single-scattering
or multi-scattering to get the look you need. This lesson will also explore the Transmission Color options on transparent shaders to achieve a colored glass effect.
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/
谷歌翻译：
在这里，您将了解漫反射和地下反射之间的区别。从对地下/扩散物体的真实分析开始，然后您将学习如何在CG中使用单散射
或多次散射以获得所需的外观。本课还将探讨透明着色器上的“透射色”选项，以实现彩色玻璃效果。
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/

Shading Theory with Karma _ Part 8 _ The Golden Challenge

Now that you know how to use the Principled Material to achieve different looks, you can try to create realistic gold using the techniques you have learned. To assist you, this lesson establishes basic gold parameters and addresses how to generate accurate RGB values for metals.
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/
谷歌翻译：
既然您知道如何使用“原理材料”来实现不同的外观，您就可以尝试使用所学的技术来创建逼真的黄金。为了帮助您，本课程建立了基本的黄金参数，并介绍了如何为金属生成准确的RGB值。
To see all the lessons and download the Scene File: sidefx.com/tutorials/shading-theory-with-karma/