Blender 2.6 Cycles材料与纹理宝典：40个实战指南

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"Blender Cycles Materials and Textures Cookbook是一本专门针对Blender 2.6版本Cycles渲染引擎的实用指南，旨在帮助读者探索并精通该引擎的所有功能，尤其是材料和纹理的创建。作者Enrico Valenza以实践为导向，通过40多个详细的配方，引导读者学习如何利用Cycles创造出逼真的自然材料如岩石、雪、冰和火焰，以及人工材质如玻璃、金属和水。书中深入讲解了Cycles的节点基础材料系统，包括如何设置3D场景进行渲染、如何构建自然与人造材料，以及如何有效地组织和重用节点以节省时间和精力。读者将学会混合闭合组件以创建基本的Cycles材料，连接不同类型的节点以构建更复杂的材料，添加基于节点的纹理到着色器中，以及创建简单到复杂的材质，如玻璃、石头、火和冰。此外，书中还介绍如何在不影响复杂链接网络的情况下切换着色器组件，管理节点编辑器窗口中的节点父母关系和重命名，以及如何通过分组来构建通用材料界面。对于光照源和全局照明设置也有详尽的指导，帮助确保最终渲染的质量和无噪点效果，避免飞虫问题。该书适合已经熟悉Blender但对Cycles渲染引擎不太了解的用户阅读，尽管对Blender界面的基本了解是有益的，但并非强制要求。如果你想要提升3D模型的真实感和视觉冲击力，无论你是初学者还是进阶者，这本书都能提供丰富的技巧和实践经验，帮助你建立一个令人印象深刻的逼真材料和纹理库。版权方面，所有内容未经出版商Packt Publishing事先书面许可，不得复制、存储或以任何形式传播。尽管作者和出版社尽力确保信息的准确性，但本书提供的信息不带任何保证，无论是明示的还是默示的，作者、Packt Publishing及其经销商不对由此书导致的直接或间接损害负责。Packt Publishing在书中正确地标注了提及的所有公司和产品的商标信息，但无法保证所有商标的完整性和准确性。"

Preface

Errata

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If you nd a mistake in one of our books—maybe a mistake in the text or the code—we would be

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aspect of the book, and we will do our best to address it.

Overview of Materials in Cycles

In Cycles the approach is quite different: all the names of the closures describing surface

properties have a Bidirectional Scattering Distribution Function (BSDF), which is a general

mathematical function that describes the way in which the light is scattered by a surface in

the real world. It's also the formula that a path tracer such as Cycles uses to calculate the

rendering of an object in a virtual environment. Basically, light rays are shot from the camera,

they bounce on the objects in the scene and keep on bouncing until they reach a light source

or an "empty" background. For this reason, a pure path tracer such as Cycles can render in

reasonable times an object set in an open environment, while instead the rendering times

increase a lot for closed spaces. For example, furniture set inside a room, and this is just

because the light rays can bounce on the oor, the ceiling, and the walls a good many times

before reaching one or more light sources.

In short, the main difference between the two rendering engines is due to the fact that, while

in Blender Internal the materials use all the traditional shader tricks of a scan-line rendering

engine such as, for example, the simulated specular component, the Cycles rendering engine

is a path tracer trying to mimic the real behavior of a surface as closely as possible as in

real life. This is the reason why in Cycles we don't have, for example, the arbitrary

Spec

factor simulating the reection point of the light on the surface, but a glossy shader actually

mirroring the light source and the surrounding, to be mixed to the other components in

different ratios and so behaving, in this respect, in a more correct way.

In any case, just for explanatory purposes, in this book I will still refer to the more or less

blurred point of light created by the reection of the light source on a mirroring glossy surface

as Specularity.

Be aware that the rendering speed in Cycles depends on the device—CPU or GPU—you use

to render your scenes. That is, basically you can decide to use the power of the CPU (default

option) or the power of the graphic card processor, the GPU.

To set this:

1. Call the User Preferences panel (Crtl + Alt +U) and go to the System tab, the last one

to the right of the panel.

2. Under the Compute Device tab to the bottom-left of the panel, select the one to be

used for the computation; to make this permanent, click on the Save User Settings

button or press Crtl + U. Now close the User Preferences panel.

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