工业自动化系统与集成 用于3D可视化的JT文件格式规范 第4部分：第3版

[中文适用范围]： 本文件定义了用于3D可视化和检查源自CAD系统的轻量级几何体和产品制造信息（PMI）的文件格式的语法和语义，所使用的可视化工具不需要CAD系统的全部功能。本文件作为ISO 10303系列之外的3D可视化能力被采纳。ISO 10303系列是用于产品全生命周期中产品定义信息的工程数据交换、共享和长期归档的ISO标准。在本文件中，3D可视化被定义为在屏幕或其他介质上以图形和文本形式呈现代表对象、信息或计算过程结果的一组数据的3D表示，以便人类通过查看介质中的可视化数据进行决策。ISO 14306 3D可视化文件格式规范包括以下数据的描述：存储有几何压缩技术的面片信息（三角形）；视觉属性，如灯光、纹理和材料；产品制造信息（PMI）；边界表示（b-rep）实体模型形状表示及相关元数据；配置表示；以及交付方法，如内容的异步流式传输。3D可视化的文件格式规范不规定用于查看和处理ISO 14306数据的运行时架构的实现或定义。 [外文原描述]： This document defines the syntax and semantics of a file format for the 3D visualization and interrogation of lightweight geometry and product manufacturing information derived from CAD systems, using visualization software tools that do not need the full capability of a CAD system. This document has been adopted as a 3D visualization capability in addition to the ISO 10303 series. The ISO 10303 series are the ISO standards adopted for the engineering data exchange, sharing and long-term archiving of product definition information throughout the product lifecycle. In this document 3D visualization is defined as the visual presentation on a screen or another media of graphical and textual 3-dimensional representations of a set of data representing an object, information or results of a computational process in order to enable decision process by a human looking at the data visualized in a medium. The ISO 14306 file format specification for 3D visualization includes data descriptions that can represent the following data: facet information (triangles), stored with geometry compression techniques; visual attributes such as lights, textures and materials; product manufacturing information (PMI); boundary representation (b-rep) solid model shape representation and associated metadata; configuration representations; and delivery methods such as asynchronous streaming of content. The file format specification for 3D visualization does not specify the implementation of, or definition of a run-time architecture for viewing and/or processing ISO 14306 data.