自古以来，人类头发的实时精确渲染都是游戏理最为复杂、最具挑战性的项目——成千上万、各自独立的微小细丝都是半透明的，都有复杂的阴影，还需要抗锯齿，而且为了配合人物动作，这些计算都需要每秒钟进行几十次，这对GPU来说是无比巨大的压力。
GPU厂商也在为实现更真实的头发效果而不懈地努力着，AMD的最新成果就是“TressFX Hair”，并且通过与Crystal Dynamics工作室的紧密合作，2013年新版《古墓丽影》第一个引入了这种技术，就看劳拉的了。



TressFX Hair使用了DirectCompute编程语言，结合AMD GCN架构(Radeon HD 7000系列)的强大并行计算能力，可以理解成将头发渲染的工作部分转到了后期处理中。AMD还利用了此前的顺序无关透明(OIT)技术，使用“Per-pixel Linked List”(每像素链接清单/PPLL)数据结构来管理渲染的复杂性和显存使用。
TressFX Hair就这样构建了一套实时物理模拟系统，将每一根头发作为几十条链接中的一环，让重力、风雨、头部运动等因素以更真实的方式描绘头发。还有碰撞检测机制，确保发丝不会彼此穿越，或者跑到头皮、衣服、身体等其它实体表面之下。
此外，头发在受到外力影响而发生变化之后，会逐渐回到最初状态。









[ 本帖最后由 codjc 于 2013-2-26 18:50 编辑 ]

360版是拖把头，PC版这次要逆天了？

这劳拉，可掳

EIDOS现在是SE下属企业，对头发的偏执，你懂得。。。
同样的技术NV也有，不过没想到AMD这么快就悄悄用到游戏里了。

引用:

原帖由 yib100000 于 26/2/2013 20:54 发表
EIDOS现在是SE下属企业，对头发的偏执，你懂得。。。
同样的技术NV也有，不过没想到AMD这么快就悄悄用到游戏里了。

……那nv开发这个技术初衷要干嘛？

posted by wap, platform: iPhone 3GS/4/4S

这技术好，现役a卡能用吗？可以的话就头顶青天了。

Bad Hair Days

Since the dawn of the 3D era, characters in your favorite games have largely featured totally unrealistic hair: blocky and jagged, often without animation that matches your character’s movements. Many games have attempted to disguise the problem with short haircuts, updos, or even unremovable helmets. But why? Simply: realistic hair is one of the most complex and challenging materials to accurately reproduce in real-time. Convincingly recreating a head of lively hair involves drawing tens of thousands of tiny and individual semi-transparent strands, each of which casts complex shadows and requires anti-aliasing. Even more challengingly, these calculations must be updated dozens of times per second to synchronize with the motion of a character.



A New Frontier of Realism

Lara Croft is an iconic character with an equally iconic ponytail. Re-imagining Lara and her haircut for the 2013 release of Tomb Raider wasn’t just an opportunity to modernize the character, it was an opportunity to substantially advance in-game realism by tackling the long-standing challenge of unrealistic hair. Through painstaking collaboration between software developers at AMD and Crystal Dynamics, Tomb Raider proudly features the world’s first real-time hair rendering technology in a playable game: TressFX Hair.



The Science of TressFX Hair

TressFX Hair revolutionizes Lara Croft’s locks by using the DirectCompute programming language to unlock the massively-parallel processing capabilities of the Graphics Core Next architecture, enabling image quality previously restricted to pre-rendered images. Building on AMD’s previous work on Order Independent Transparency, this method makes use of Per-Pixel Linked-List data structures to manage rendering complexity and memory usage.

DirectCompute is additionally utilized to perform the real-time physics simulations for TressFX Hair. This physics system treats each strand of hair as a chain with dozens of links, permitting for forces like gravity, wind and movement of the head to move and curl Lara’s hair in a realistic fashion. Further, collision detection is performed to ensure that strands do not pass through one another, or other solid surfaces such as Lara’s head, clothing and body. Finally, hair styles are simulated by gradually pulling the strands back towards their original shape after they have moved in response to an external force.

Graphics cards featuring the Graphics Core Next architecture, like select AMD Radeon HD 7000 Series, are particularly well-equipped to handle these types of tasks, with their combination of fast on-chip shared memory and massive processing throughput on the order of trillions of operations per second.

blogs.amd.com

以后发廊小弟洗剪吹不要太飘逸，v13里的看你们的了

好幽怨的劳拉，可以和新版柯塔纳一起下海。

这个可以有啊, 本世代无法实现了吧? 就等次世代了.

希望广泛运用.

posted by wap, platform: iPhone 3GS/4/4S

感觉现在amd明显发力啊，前有鬼泣，后有显卡危机3，现在又有古墓…

引用:

原帖由 石指圣 于 2013-2-26 19:11 发表


……那nv开发这个技术初衷要干嘛？

天知道NV在想啥，GTX480的时候就把功能几乎完全一样的头发渲染Demo放出来了。到现在也没见NV去找哪个游戏商合作。
最初宣传是展现GF100强大的曲面细分能力，用曲面细分生成发丝，Phsyx展现发丝的物理表现，FXAA抗锯齿平滑边缘。

[ 本帖最后由 yib100000 于 2013-2-26 19:38 编辑 ]

下一代主机全是ati家的天下，主机厂门是该针对它好好优化了。

7字头A卡才能用，你妹啊

posted by wap, platform: iPhone

引用:

原帖由 @AzureZH  于 2013-2-26 19:28 发表
7字头A卡才能用，你妹啊

喷了，刚想换660ti，这下又犹豫了。