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GB/T 36341.1-2018: Information technology -- Information representation of shape modeling -- Part 1: Framework and basic component
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GB/T 36341.1-2018: Information technology -- Information representation of shape modeling -- Part 1: Framework and basic component

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Information technology--Information representation of shape modeling--Part 1. Framework and basic component ICS 35.140 L81 National Standards of People's Republic of China Information technology shape modeling information representation Part 1. Framework and basic components Part 1. Frameworkandbasiccomponent Published on.2018-06-07 2019-01-01 implementation State market supervision and administration China National Standardization Administration issued

Content

Foreword I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Abbreviations 2 5 Frame Overview 3 6 continuous representation of the body 4 6.1 Basic geometry 4 6.2 Parameter curve surface shape 13 6.3 Topological relations of parametric shapes 22 7 discrete representation of the body 23 7.1 point cloud shape 23 7.2 Simple polygonal body 23 7.3 Polygon surface mesh shape 24 7.4 Subdivision curve body 24 7.5 Subdivision surface shape 24 8 entity attribute 25 8.1 Texture Properties 25 8.2 Material Properties 25 8.3 User-defined attributes 27

Foreword

GB/T 36341 "Information Technology Shape Modeling Information Representation" is divided into four parts. --- Part 1. Framework and basic components; --- Part 2. Feature constraints; --- Part 3. Streaming; --- Part 4. Storage format. This part is the first part of GB/T 36341. This part is drafted in accordance with the rules given in GB/T 1.1-2009. Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying these patents. This part is proposed and managed by the National Information Technology Standardization Technical Committee (SAC/TC28). This section drafted by. Peking University, China Electronics Technology Standardization Institute, Beijing University of Aeronautics and Astronautics, Tianjin University, Beijing Zhongke Fulong Computer Technology Co., Ltd., Beijing Forestry University. The main drafters of this section. Wang Guoping, Wang Cong, Ma Shanshan, Tang Weiqing, Yang Zhuangyuan, Ning Tao, Li Sheng, Gao Leilei, Lai Yunan, Wan Liang, Xu Yuwen, Wang Shaorong, Cao Chengkun, Ye Xiaoci, Xian Yongzhang, Zhang Yiyi. Information technology shape modeling information representation Part 1. Framework and basic components

1 Scope

This part of GB/T 36341 specifies the framework and basic components in the shape modeling information representation, including various geometric data in the model. And auxiliary information such as textures and materials. This section applies to computer-aided design, 3D animation, virtual reality, augmented reality or mixed reality, 3D digital medicine, 3D numbers The representation of 3D model data in the fields of word entertainment, e-commerce, etc., and is applicable to the design, development and application of products in the above fields.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 5271.1-2000 Information technology vocabulary Part 1. Basic terms

3 Terms and definitions

The following terms and definitions as defined in GB/T 5271.1-2000 apply to this document. 3.1 Entity entity A collection of shapes and their attributes. Note. Entities in this standard do not represent the concept of voxels. 3.2 Attribute attribute Intangible information about entities, including textures, materials, and user-defined types (text, images, and video). 3.3 Shape Represents a geometric shape within a finite range in three-dimensional space, consisting of several geometric elements and their topological relationships. Note. This section covers only the geometric shapes commonly used in the field of shape modeling information representation, belonging to all known geometric model subsets. 3.4 Index index The unique location of a piece of data in a sequence of data. 3.5 Point The basic element that represents the position attribute in 3D Euclidean space. 3.6 Normal normalvector A vector that is perpendicular to the given object. Note. In 3D Euclidean space, the normal at a point at a point is a vector perpendicular to the tangent plane at the point at which the curve is normal. A vector that is perpendicular to the tangential direction of the point. ...