This document is Edition 4 of ISO/IEC 19775-1, Extensible 3D (X3D). The full title of this part of the International Standard is: Information technology — Computer graphics, image processing and environmental representation — Extensible 3D (X3D) — Part 1: Architecture and base components.

Background	Clauses		Annexes
Foreword	1  Scope	22  Environmental sensor component	A  Core profile
Introduction	2  Normative references	23  Navigation component	B  Interchange profile
	3  Definitions, acronyms, and abbreviations	24  Environmental effects component	C  Interactive profile
	4  Concepts	25  Geospatial component	D  MPEG-4 interactive profile
	5  Field type reference	26  Humanoid Animation (HAnim) component	E  Immersive profile
	6  Conformance	27  NURBS component	F  Full profile
	7  Core component	28  Distributed interactive simulation (DIS) component	G  Recommended navigation behaviours
	8  Time component	29  Scripting component	H CADInterchange profile
	9  Networking component	30  Event utilities component	I  OpenGL shading language (GLSL) binding
	10  Grouping component	31  Programmable shaders component	J  Microsoft high level shading language (HLSL) binding
	11  Rendering component	32  CAD geometry component	K  nVidia Cg shading language binding
	12  Shape component	33  Texturing3D component	L  MedicalInterchange profile
	13  Geometry3D component	34  Cube map environmental texturing component	Z Version content
	14  Geometry2D component	35  Layering component	Bibliography
	15  Text component	36  Layout component	Component index
	16  Sound component	37  Rigid body physics component	Profile index
	17  Lighting component	38  Picking sensor component	Node index
	18  Texturing component	39  Followers component
	19  Interpolation component	40  Particle systems component
	20  Pointing device sensor component	41  Volume rendering component
	21  Key device sensor component	42  Annotation component
		43  Projective texture mapping component

The Foreword provides background on the standards process for X3D. The Introduction describes the purpose, design criteria, and functional characteristics of X3D. The following clauses define Part 1 of ISO/IEC 19775:

1. Scope defines the problem area that X3D addresses.
2. Normative references lists the normative standards referenced in this part of ISO/IEC 19775. (editorial updates to latest versions)
3. Definitions, acronyms, and abbreviations contains the glossary of terminology used in this part of ISO/IEC 19775.
4. Concepts describes the workings of the X3D runtime system.
5. Field type reference describes the fundamental data types in X3D (expected addition of HTML5 event-model and DEF/id relationships).
6. Conformance describes the conformance requirements for X3D implementations.
7. Core component provides a detailed specification of the Core component of X3D, including typed metadata sets.
8. Time component provides a detailed specification of the Time component of X3D.
9. Networking component provides a detailed specification of the Networking component of X3D (proposed changes to Inline content, security precautions).
10. Grouping component provides a detailed specification of the Grouping component of X3D.
11. Rendering component provides a detailed specification of the Rendering component of X3D.
12. Shape component provides a detailed specification of the Shape component of X3D (proposed node PointProperties, expected node ExternalShape).
13. Geometry3D component provides a detailed specification of the Geometry3D component of X3D.
14. Geometry2D component provides a detailed specification of the Geometry2D component of X3D.
15. Text provides a detailed specification of the Text component of X3D.
16. Sound component provides a detailed specification of the Time component of X3D (expected changes for spatialization).
17. Lighting component provides a detailed specification of the Lighting component of X3D (expected addition of advanced lighting model matching glTF).
18. Texturing component provides a detailed specification of the Texturing component of X3D (expected addition of ImageTextureAtlas).
19. Interpolation component provides a detailed specification of the Interpolation component of X3D.
20. Pointing device sensor component provides a detailed specification of the Pointing device sensor component of X3D.
21. Key device sensor component provides a detailed specification of the Key device sensor component of X3D.
22. Environmental sensor component provides a detailed specification of the Environmental sensor component of X3D.
23. Navigation component provides a detailed specification of the Navigation component of X3D.
24. Environmental effects component provides a detailed specification of the Environmental effects component of X3D.
25. Geospatial component provides a detailed specification of the Geospatial component of X3D.
26. Humanoid animation (HAnimH-Anim) component provides a detailed specification of the Humanoid animation (HAnimH-Anim) component of X3D. (proposed addition of HAnimMotion, remove hyphen from component name).
27. NURBS component provides a detailed specification of the NURBS component of X3D.
28. Distributed interactive simulation (DIS) component provides a detailed specification of the DIS component of X3D.
29. Scripting component provides a detailed specification of the Scripting component of X3D.
30. Event utilities component provides a detailed specification of the Event utilities component of X3D.
31. Shader component provides a detailed specification of the Shader component of X3D.
32. CAD geometry component provides a detailed specification of the CAD geometry component of X3D.
33. Texturing3D component provides a detailed specification of the 3D texturing component of X3D.
34. Environmental texturing component provides a detailed specification of the environmental texturing component of X3D.
35. Layering component provides a detailed specification for organizing the content of worlds into independent, overlapping layers.
36. Layout component provides a detailed specification for arranging content to appear in specific regions of the display surface (proposed deprecation/deletion).
37. Rigid body physics component provides a detailed specification for applying rigid body physics properties to content.
38. Picking sensor component provides a detailed specification for selecting items in the content by user interaction.
39. Followers component provides a detailed specification for using follower transitions.
40. Particle systems component provides a detailed specification for specifying and using particle systems in X3D worlds.
41. Volume rendering component provides a detailed specification for the rendering of volumetric data sets as part of X3D worlds.
42. Annotation component provides a detailed specification on how to present information that always faces the viewer (proposed addition).
43. Projective texture mapping component provides a detailed specification for projecting textures onto geometry (proposed addition).

There are several annexes included in the specification:

1. Core profile defines a minimal subset of X3D functionality that constitutes the Core profile.
2. Interchange profile defines the proper subset of X3D functionality that constitutes the Interchange profile.
3. Interactive profile defines the proper subset of X3D functionality that constitutes the Interactive profile.
4. MPEG-4 interactive profile defines the proper subset of X3D functionality that constitutes the MPEG-4 interactive profile.
5. Immersive profile defines the proper subset of X3D functionality that corresponds to the base profile defined in ISO/IEC 14772-1.
6. Full profile defines the proper subset of X3D functionality that constitutes the Full profile.
7. Recommended navigation behaviours specifies some recommended behaviours that may be adopted by browser implementers.
8. CADInterchange profile defines the proper subset of X3D functionality that constitutes the CADInterchange profile.
9. OpenGL shading language (GLSL) binding provides a mapping of Programmable shader component functionality to the GLSL shading language.
10. Microsoft DirectX shading language (HLSL) binding provides a mapping of Programmable shader component functionality to the HLSL shading language.
11. nVidia CG shading language binding provides a mapping of Programmable shader component functionality to the Cg shading language.
12. MedicalInterchange profile defines the proper subset of X3D functionality that constitutes the MedicalInterchange profile.
26. Version content specifies which X3D functionality is in which version.

Bibliography lists the informative, non-standard topics referenced in this part of ISO/IEC 19775.

Component index lists the available components defined in this part of ISO/IEC 19775 in alphabetical order with hyperlinks to their respective definitions (addition of Annotation and Projective Texture Mapping components, proposed deprecation/deletion of Layout component).

Profile index lists the profiles defined in this part of ISO/IEC 19775 in alphabetical order with hyperlinks to their respective definitions.

Node index lists the nodes defined in this part of ISO/IEC 19775 in alphabetical order with hyperlinks to their respective definitions (addition/deletion of X3Dv4 nodes).