本视频教程是由cmiVFX机构出品的C4D表面建模技术视频教程，cmiVFX C4D Surface Modeling Techniques，时长：2小时46分，大小：591 MB，MP4高清视频格式，附工程源文件，教程使用软件：Cinema 4D，作者：Chris Maynard，Michael Marcondes，官方发布日期：2011年11月30日，语言：英语。。

Cinema 4D是一套由德国公司Maxon Computer开发的3D绘图软件，以及高的运算速度和强大的渲染插件著称。Cinema 4D 应用广泛，在广告、电影、工业设计、等方面都有出色的表现，例如影片《阿凡达》有花鸦三维影动研究室中国工作人员使用Cinema 4D制作了部分场景，在这样的大片中看到C4D的表现是很优秀的。在其他动画电影中也使用到C4D的有很多如《毁灭战士》（Doom）、《范海辛》〈Van Helsing〉、《蜘蛛侠》、以及动画片《极地特快》、《丛林总动员》（Open Season）等等。它正成为许多一流艺术家和电影公司的首选，Cinema 4D已经走向成熟，很多模块的功能在同类软件中是代表科技进步的成果。

cmiVFX C4D Surface Modeling Techniques

Surface Modeling is used in 3D and other computer graphics software to describe the skin of a 3D geometric element. Freeform surfaces do not have rigid radial dimensions, unlike regular surfaces such as planes, cylinders and conic surfaces. They are used to describe forms such as turbine blades, car bodies and boat hulls. Initially developed for the automotive and aerospace industries, freeform surfacing is now widely used in all engineering design disciplines from consumer goods products to ships.

When defining a form, an important factor is the continuity between surfaces – how smoothly they connect to one another. One example of where surfacing excels is automotive body panels. Just blending two curved areas of the panel with different radii of curvature together, maintaining tangential continuity (meaning that the blended surface doesn’t change direction suddenly, but smoothly) won’t be enough. They need to have a continuous rate of curvature change between the two sections, or else their reflections will appear disconnected.