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"Ptex" 皮克斯新贴图技术  

2009-08-23 00:49:02|  分类: 新技术 CG Tech |  标签: |举报 |字号 订阅

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基于面的贴图产品渲染技术。模型的每个面,都可以储存64*64至2048*2048的贴图信息。并且使面与面之间实现无缝衔接,即使在非常近的距离观看。

Ptex 皮克斯新贴图技术 - 石像鬼 - 鬼喊鬼叫

Ptex技术已经在 Disney's BOLT and Glago's Guest 两部动画片中应用。

Ptex 支持在 Pixar's RenderMan 中渲染。开元的版本也将在之后发布。

  • Download Video 1 (YouTube), 观看视频。
  • Download Video 2 (69M, JPEG encoding), 视频演示。
  • 官方地址:http://www.disneyanimation.com/library/ptex/

     

    Ptex: Per-Face Texture Mapping for Production Rendering.

    Figure 1: T. Rex with 2694 faces rendered with Ptex. No explicit UV assignment was used. The largest texture layer, the fine-scale displacements, has 836 million texels stored in a single Ptex file with individual face resolutions ranging from 64 x 64 to 2048 x 2048 texels. No seams are visible across faces, even under close magnification. (©Walt Disney Animation Studios)

    Abstract:

    Explicit parameterization of subdivision surfaces for texture mapping adds significant cost and complexity to film production. Most parameterization methods currently in use require setup effort, and none are completely general. We propose a new texture mapping method for Catmull-Clark subdivision surfaces that requires no explicit parameterization. Our method, Ptex, stores a separate texture per quad face of the subdivision control mesh, along with a novel per-face adjacency map, in a single texture file per surface. Ptex uses the adjacency data to perform seamless anisotropic filtering of multi-resolution textures across surfaces of arbitrary topology. Just as importantly, Ptex requires no manual setup and scales to models of arbitrary mesh complexity and texture detail. Ptex has been successfully used to texture all of the models in an animated theatrical short and is currently being applied to an entire animated feature. Ptex has eliminated UV assignment from our studio and significantly increased the efficiency of our pipeline.

    Ptex has been used extensively in Disney's BOLT and Glago's Guest.

    Ptex is now supported in Pixar's RenderMan. An open source release of the Ptex library is coming soon.

    The definitive version of this paper is available at diglib.eg.org or download the pdf version.

    @inproceedings{burley08ptex, author = {Brent Burley and Dylan Lacewell}, title = {Ptex: Per-Face Texture Mapping for Production Rendering}, booktitle = {Eurographics Symposium on Rendering 2008}, year = {2008}, pages = {1155--1164}}

    For more info email: ptexinfo at disneyanimation dot com

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