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GB/T 36341.1-2018Information technology—Information representation of shape modeling—Part 1: Framework and basic component (English PDF)

信息技术形状建模信息表示第1部分：框架和基本组件

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

June 7, 2018

Implementation date

January 1, 2019

Scope

GB/T 36341.1-2018 is the English-translated version of 信息技术形状建模信息表示第1部分：框架和基本组件.

GB/T 36341.1-2018 is the first of four parts of the Chinese standard on how shape models are represented as data, and it sets out the framework and the basic components.

It defines the entity as a set of shapes with their attributes, and covers the continuous representation of a body, through basic geometry, parametric curves and surfaces and their topological relations, and the discrete representation, through point clouds, simple polygonal bodies, polygon surface meshes and subdivision curves and surfaces.

It also defines entity attributes: textures, materials and user-defined attributes such as text, images and video. It applies to 3D model data in computer-aided design, 3D animation, virtual, augmented and mixed reality, 3D digital medicine, digital entertainment and e-commerce. It was issued on 7 June 2018 and has applied since 1 January 2019.

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Document preview — GB/T 36341.1-2018

National Standard of the People's Republic of China

ICS: 35.140
Classification: L 81

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

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

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.

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 document. 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

A collection of shapes and their attributes.

Note: Entities in this standard do not represent the concept of voxels.

3.2 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

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

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.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 27 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 5271.1-2000Information technology. Vocabulary. Part 1: Fundamental terms

Cited by

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GB/T 36341.2-2018|GB/T 36341.3-2018|GB/T 36341.4-2018|GB/T 44247-2024

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