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首页3dtiles 数据格式规范.pdf
3dtiles 数据格式规范.pdf
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本文档介绍了3Dtiles的规范,3Dtiles是用于流式传输大量离散的3D地理空间数据集的开放标准。
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Document number: 18-053r2
Document type:
Candidate OGC
®
Community Standard
Document subtype:
Document stage:
Pending
Document language:
English
1
Open Geospatial Consortium
Submission Date: 2018-06-04
Approval Date: TBD
Publication Date: TBD
External identifier of this OGC
®
document: TBD
Internal reference number of this OGC
®
document: 18-053r2
Version: 1.0r2
Category: Candidate OGC
®
Community Standard
Editors: Patrick Cozzi, Sean Lilley, Gabby Getz
3D Tiles Specification 1.0
Copyright notice
Copyright © 2016-2018 Cesium and Open Geospatial Consortium
Warning
This document is an OGC Member endorsed international Community standard. This
Community standard was developed outside of the OGC and the originating party may continue
to update their work; however, this document is fixed in content. This document is available on a
royalty free, non-discriminatory basis. Recipients of this document are invited to submit, with
their comments, notification of any relevant patent rights of which they are aware and to provide
supporting documentation.
2
The companies listed above have granted the Open Geospatial Consortium (OGC) a
nonexclusive, royalty-free, paid up, worldwide license to copy and distribute this document and
to modify this document and distribute copies of the modified version under a Attribution 4.0
International (CC BY 4.0) license (see below).
License Agreement
Copyright © 2016-2018 Cesium and Open Geospatial Consortium
This Specification is licensed under a Creative Commons Attribution 4.0 International License
(CC BY 4.0).
Some parts of this Specification are purely informative and do not define requirements necessary
for compliance and so are outside the Scope of this Specification. These parts of the
Specification are marked as being non-normative, or identified as Implementation Notes.
3
Contents
Contents ........................................................................................................................................................... 3
Table of figures ........................................................................................................................................... 7
Source of the content for this OGC document .............................................................................. 9
Validity of content .................................................................................................................................... 9
Preface .......................................................................................................................................................... 9
Future work ................................................................................................................................................. 9
1 Scope ....................................................................................................................................................... 10
2 Conformance ........................................................................................................................................ 10
3 References ............................................................................................................................................. 11
3.1 Normative ...................................................................................................................................... 11
4 Terms and Definitions ....................................................................................................................... 11
5 Conventions .......................................................................................................................................... 13
6 3D Tiles Specification ......................................................................................................................... 13
6.1 Overview ......................................................................................................................................... 13
6.2 File extensions and MIME types ............................................................................................. 15
6.3 JSON encoding ............................................................................................................................. 15
6.4 URIs ................................................................................................................................................... 15
6.5 Units ................................................................................................................................................. 16
6.6 Coordinate reference system (CRS) ...................................................................................... 16
6.7 Tiles ................................................................................................................................................... 16
6.7.1 Geometric error ................................................................................................................... 16
6.7.2 Refinement ............................................................................................................................ 17
6.7.3 Bounding volumes .............................................................................................................. 18
6.7.4 Viewer request volume .................................................................................................... 22
6.7.5 Transforms ............................................................................................................................ 24
6.7.6 Tile JSON ............................................................................................................................... 28
6.8 Tileset JSON .................................................................................................................................. 33
4
6.8.1 External tilesets ................................................................................................................... 35
6.8.2 Bounding volume spatial coherence ........................................................................... 36
6.8.3 Spatial data structures ...................................................................................................... 37
6.9 Specifying extensions and application specific extras .................................................. 40
6.9.1 Extensions ............................................................................................................................. 40
6.9.2 Extras....................................................................................................................................... 42
6.10 Tile format specifications ..................................................................................................... 42
7 Property reference ............................................................................................................................. 43
7.1 Tileset .............................................................................................................................................. 43
7.2 Asset ................................................................................................................................................ 45
7.3 Bounding Volume ...................................................................................................................... 46
7.4 Extension ....................................................................................................................................... 48
7.5 Extras ............................................................................................................................................... 48
7.6 Properties ...................................................................................................................................... 48
7.7 Tile .................................................................................................................................................... 49
7.8 Tile Content .................................................................................................................................. 53
8 Feature Table ....................................................................................................................................... 54
8.1 Overview ........................................................................................................................................ 54
8.2 Layout ............................................................................................................................................. 55
8.2.1 Padding .................................................................................................................................. 55
8.2.2 JSON header ........................................................................................................................ 56
8.2.3 Binary body .......................................................................................................................... 57
8.3 Implementation example ......................................................................................................... 57
8.4 Property reference ..................................................................................................................... 57
8.4.1 Feature Table ....................................................................................................................... 57
8.4.2 BinaryBodyReference ........................................................................................................ 58
8.4.3 Property ................................................................................................................................. 59
9 Batch Table ........................................................................................................................................... 59
5
9.1 Overview ........................................................................................................................................ 59
9.2 Layout ............................................................................................................................................. 59
9.2.1 Padding .................................................................................................................................. 60
9.2.2 JSON header ........................................................................................................................ 60
9.2.3 Binary body .......................................................................................................................... 62
9.3 Implementation example ......................................................................................................... 63
9.4 Property reference ..................................................................................................................... 64
9.4.1 Batch Table ........................................................................................................................... 64
9.4.2 BinaryBodyReference ........................................................................................................ 64
9.4.3 Property ................................................................................................................................. 66
10 Tile format specifications ................................................................................................................ 66
10.1 Batched 3D Model ................................................................................................................. 66
10.1.1 Overview ................................................................................................................................ 66
10.1.2 Layout ..................................................................................................................................... 67
10.1.3 Header .................................................................................................................................... 68
10.1.4 Feature Table ....................................................................................................................... 68
10.1.5 Batch Table ........................................................................................................................... 69
10.1.6 Binary glTF ............................................................................................................................ 69
10.1.7 File extension and MIME type ........................................................................................ 71
10.1.8 Implementation example ................................................................................................. 71
10.2 Instanced 3D Model .............................................................................................................. 73
10.2.1 Overview ................................................................................................................................ 73
10.2.2 Layout ..................................................................................................................................... 74
10.2.3 Header .................................................................................................................................... 74
10.2.4 Feature Table ....................................................................................................................... 75
10.2.5 Batch Table ........................................................................................................................... 83
10.2.6 glTF .......................................................................................................................................... 83
10.2.7 File extension and MIME type ....................................................................................... 84
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