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TressFX : ウィキペディア英語版
TressFX

AMD TressFX is a source-available software developed by AMD which provides for advanced GPU rendering of hair, fur, and grass in video games. The competing solution offered by Nvidia is HairWorks which is part of their GameWorks suite, and is proprietary in nature.
==Motivations for Development and Origins==

Traditionally, hair representation in video games has been sub-par for several reasons. For short hair (especially on male characters), hair has often been represented by a detailed texture on a character's skeleton. This makes is difficult to represent hair styles that are not pressed flat against the skull. Longer hair is often represented as a texture on a moving part of a skeleton and thus moves as a multi-jointed appendage. While this hair has more movement than the former, the movement is usually physically unrealistic – the hair moves as one body and movement is very often under or over damped.
In order to overcome this, AMD developed TressFX Hair. TressFX Hair models each of potentially thousands of strands of hair individually with dozens of links per strands of hair. Each strand reacts to different physical forces such as gravity, inertia, wind, and movement of a characters head. This allows the hair to move in a much more physically realistic manner.
Because simulating thousands of strands of hair is much more computationally intense than displaying a texture over a character's skeleton, the impact of TressFX Hair on game performance and frame rates may not be trivial. High performance video cards may have enough resources available that the extra effort of rendering hair may produce negligible or acceptable frame rate losses. Conversely, older video cards may spend an large proportion of each frame's render time rendering hair, and this can noticeably reduce game performance. Of course, performance is interrelated with other game settings, resolution, the number of objects with hair to be rendered in the screen, amount of hair per object, and distance from the object.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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