本视频教程是由cmiVFX机构出品的Houdini中L-System基础使用视频教程，cmiVFX Houdini L-System Essentials 1 & 2，大小：1.86 GB，MP4高清视频格式，教程使用软件：Mudbox，作者：david gary，官方发布日期：2009年11月19日，语言：英语。人人CG整理发布。
在视频一中，我们向您介绍了什么是 L-systems，如何构建结构较好的树木、植被和花草的模型。而在这第二部视频教程中我们会向你展示植被渲染的工作流程。
祥细阐述了组合两类技术的一种方法:用L-systems和遗传算法(GA)获取一种改写表达式描述叶子形状.一个L-systems用于构造给定改写表达式,而GA是用于改写表达式的适应参数.介绍了用目标函数实现实值参数替换方法,研究结果表明提出的方法产生可以接受的输出效果.
Autodesk® Mudbox™ 由电影、游戏和设计行业的专业艺术家设计，为三维建模人员和纹理艺术家提供了创作自由性，而不用担心技术细节。Mudbox 是一个杰出的数字雕刻和纹理绘画解决方案，结合了高度直观的用户界面和强大的创作工具集，可用于制作超逼真的三维模型。Mudbox 打破了传统三维建模软件的模型，提供了一种包括二维和三维层的基于笔刷的有机三维建模体验，可以轻松管理多个网格和贴图上的雕刻与绘画迭代。您也可以在一个目标环境中评估或呈现您的作品，从而确保准确、逼真的结果。
开发团队的高端影视行业背景更使得该软件拥有无与伦比的性能。据称 weta 已经在生产线上彻底放弃了 Zbrush，而转向目前仍在Beta开发中的这款神秘雕塑建模软件 Mudbox。Mudbox 已在去年被用于《金刚》的制作生产线中。以制作《指环王》《金刚》《纳尼亚传奇》而闻名于世的着名CG特效公司已经在生产线上彻底放弃了Zbrush软件，而转向一个目前神秘雕塑建模软件Mudbox。
cmiVFX Houdini L-System Essentials 1 & 2
Upon general request,this is the first video ever released about this immense and yet not well-known field of computer graphics. L-systems are a very useful language for describing fractal looking objects and branching structures. It’s mainly used in environmental design, both artistic and scientific, to create realistic plants and trees and to simulate complex botanical animated phenomena. It has been used in special effects in a great variety of films to create anatomical patterns such as neurons in Fight Club or vessels in Hollow-Man 2.In these videos, we want to unleash the power of the l-systems by showing you the maximum of different things you can make with them:From the large topic of plant and tree modeling to tentacle animation, wire DOPs, lightning effects, complex crack generation, snowflakes, corals, L-system based surfaces, city pattern creation, blood flow through bronchus, making L-systems more scriptable and much more ( generalized recursive modeling). For plants, instead of showing you in full detail how to model an orchid and let you find your way alone to model a tulip or liliac we took another smooth but yet very in-depth and comprehensive approach where you will learn ALL the techniques and acquire methodology to model ANY plant or tree through complete key examples下载地址：
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