1、Information technology Runtime 3D asset delivery format Khronos glTF 2.0Technologies de linformation Format de livraison dactifs 3D dexcution Khronos glTF 2.0INTERNATIONAL STANDARDISO/IEC 12113First edition 2022-07Reference number ISO/IEC 12113:2022(E)ISO/IEC 2022iiISO/IEC 12113:2022(E)COPYRIGHT PRO
2、TECTED DOCUMENT ISO/IEC 2022All rights reserved.Unless otherwise specified,or required in the context of its implementation,no part of this publication may be reproduced or utilized otherwise in any form or by any means,electronic or mechanical,including photocopying,or posting on the internet or an
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4、in Switzerland ISO/IEC 2022 All rights reservedISO/IEC 12113:2022(E)ISO/IEC 2022 All rights reserved iii Foreword ISO(the International Organization for Standardization)and IEC(the International Electrotechnical Commission)form the specialized system for worldwide standardization.National bodies tha
5、t are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity.ISO and IEC technical committees collaborate in fields of mutual interest.Other internati
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7、for the different types of document should be noted(see www.iso.org/directives or www.iec.ch/members_experts/refdocs).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.ISO and IEC shall not be held responsible for identifying any or
8、all such patent rights.Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received(see www.iso.org/patents)or the IEC list of patent declarations received(see https:/patents.iec.ch).Any trade name u
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10、World Trade Organization(WTO)principles in the Technical Barriers to Trade(TBT),see www.iso.org/iso/foreword.html.In the IEC,see www.iec.ch/understanding-standards.This document was prepared by Khronos(as glTF 2.0 Specification)and drafted in accordance with its editorial rules.It was adopted,under
11、the JTC 1 PAS procedure,by Joint Technical Committee ISO/IEC JTC 1,Information technology.Any feedback or questions on this document should be directed to the users national standards body.A complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national-committees.
12、Table of Contents1.Foreword.12.Introduction.22.1.General.22.2.Document Conventions.22.2.1.Normative Terminology and References.22.2.2.Informative Language.22.2.3.Technical Terminology.32.2.4.Normative References.52.2.4.1.External Specifications.52.2.4.2.Media Type Registrations.62.3.Motivation and D
13、esign Goals(Informative).72.4.glTF Basics.82.5.Versioning.82.6.File Extensions and Media Types.82.7.JSON Encoding.92.8.URIs.113.Concepts.133.1.General.133.2.Asset.133.3.Indices and Names.143.4.Coordinate System and Units.153.5.Scenes.153.5.1.Overview.153.5.2.Nodes and Hierarchy.163.5.3.Transformatio
14、ns.173.6.Binary Data Storage.193.6.1.Buffers and Buffer Views.193.6.1.1.Overview.193.6.1.2.GLB-stored Buffer.213.6.2.Accessors.223.6.2.1.Overview.223.6.2.2.Accessor Data Types.233.6.2.3.Sparse Accessors.243.6.2.4.Data Alignment.253.6.2.5.Accessors Bounds.283.7.Geometry.283.7.1.Overview.283.7.2.Meshe
15、s.28ISO/IEC 12113:2022(E)iv ISO/IEC 2022 All rights reserved3.7.2.1.Overview.283.7.2.2.Morph Targets.323.7.3.Skins.353.7.3.1.Overview.353.7.3.2.Joint Hierarchy.363.7.3.3.Skinned Mesh Attributes.373.7.4.Instantiation.393.8.Texture Data.413.8.1.Overview.413.8.2.Textures.423.8.3.Images.423.8.4.Samplers
16、.443.8.4.1.Overview.443.8.4.2.Filtering.443.8.4.3.Wrapping.453.8.4.4.Example.453.8.4.5.Non-power-of-two Textures.463.9.Materials.463.9.1.Overview.463.9.2.Metallic-Roughness Material.473.9.3.Additional Textures.493.9.4.Alpha Coverage.513.9.5.Double Sided.523.9.6.Default Material.523.9.7.Point and Line Materials.523.10.Cameras.533.10.1.Overview.533.10.2.View Matrix.533.10.3.Projection Matrices.533.10.3.1.Overview.533.10.3.2.Infinite perspective projection.543.10.3.3.Finite perspective projection.5