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xrfragment/doc/RFC_XR_Fragments.txt

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2023-09-01 14:20:02 +02:00
Internet Engineering Task Force L.R. van Kammen
Internet-Draft 31 August 2023
Intended status: Informational
Expires: 3 March 2024
XR Fragments
draft-XRFRAGMENTS-leonvankammen-00
Abstract
This draft offers a specification for 4D URLs & navigation, to link
3D scenes and text together with- or without a network-connection.
The specification promotes spatial addressibility, sharing,
navigation, query-ing and interactive text across for (XR) Browsers.
XR Fragments allows us to enrich existing dataformats, by recursive
use of existing technologies like URI Fragments
(https://en.wikipedia.org/wiki/URI_fragment) & visual-meta
(https://visual-meta.info).
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on 3 March 2024.
Copyright Notice
Copyright (c) 2023 IETF Trust and the persons identified as the
document authors. All rights reserved.
van Kammen Expires 3 March 2024 [Page 1]
Internet-Draft XR Fragments August 2023
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document. Code Components
extracted from this document must include Revised BSD License text as
described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions and Definitions . . . . . . . . . . . . . . . . . 2
3. Navigating 3D . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Navigating text . . . . . . . . . . . . . . . . . . . . . . . 3
5. Embedding 3D content . . . . . . . . . . . . . . . . . . . . 3
6. Embedding text . . . . . . . . . . . . . . . . . . . . . . . 4
7. List of XR URI Fragments . . . . . . . . . . . . . . . . . . 4
8. Security Considerations . . . . . . . . . . . . . . . . . . . 4
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
How can we add more features to existing text & 3D scenes, without
introducing new dataformats? Historically, there's many attempts to
create the ultimate markuplanguage or 3D fileformat. However, thru
the lens of authorina,g their lowest common denominator is still:
plain text. XR Fragments allows us to enrich existing dataformats,
by recursive use of existing technologies:
* addressibility & navigation of 3D objects: URI Fragments
(https://en.wikipedia.org/wiki/URI_fragment) + (src/href) metadata
* addressibility & navigation of text objects: visual-meta
(https://visual-meta.info)
2. Conventions and Definitions
* scene: a (local/remote) 3D scene or 3D file (index.gltf e.g.)
* 3D object: an object inside a scene characterized by vertex-,
face- and customproperty data.
* metadata: custom properties defined in 3D Scene or Object(nodes)
* XR fragment: URI Fragment with spatial hints (#pos=0,0,0&t=1,100
e.g.)
* src: a (HTML-piggybacked) metadata-attribute of a 3D object which
instances content
* href: a (HTML-piggybacked) metadata-attribute of a 3D object which
links to content
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* query: an URI Fragment-operator which queries object(s) from a
scene (#q=cube)
{::boilerplate bcp14-tagged}
3. Navigating 3D
Here's an ascii representation of a 3D scene-graph which contains 3D
objects (◻) and their metadata:
index.gltf
│
├── ◻ buttonA
│ └ href: #pos=1,0,1&t=100,200
│
└── ◻ buttonB
└ href: other.fbx
An XR Fragment-compatible browser viewing this scene, allows the end-
user to interact with the buttonA and buttonB. In case of buttonA
the end-user will be teleported to another location and time in the
*current loaded scene*, but buttonB will *replace the current scene*
with a new one (other.fbx).
4. Navigating text
TODO
5. Embedding 3D content
Here's an ascii representation of a 3D scene-graph with 3D objects
(◻) which embeds remote & local 3D objects (◻) (without)
using queries:
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+------------------------------------------------------------+ +---------------------------+
| | | |
| index.gltf | | rescue.com/aquarium.gltf |
| │ | | │ |
| ├── ◻ canvas | | └── ◻ fishbowl |
| │ └ src: painting.png | | ├─ ◻ bassfish |
| │ | | └─ ◻ tuna |
| ├── ◻ aquariumcube | | |
| │ └ src: ://rescue.com/fish.gltf#q=bassfish%20tuna | +---------------------------+
| │ |
| ├── ◻ bedroom |
| │ └ src: #q=canvas |
| │ |
| └── ◻ livingroom |
| └ src: #q=canvas |
| |
+------------------------------------------------------------+
An XR Fragment-compatible browser viewing this scene, lazy-loads and
projects painting.png onto the (plane) object called canvas (which is
copy-instanced in the bed and livingroom). Also, after lazy-loading
rescue.com/aquarium.gltf, only the queried objects bassfish and tuna
will be instanced inside aquariumcube. Resizing will be happen
accordingly to its placeholder object (aquariumcube), see chapter
Scaling.
6. Embedding text
7. List of XR URI Fragments
8. Security Considerations
TODO Security
9. IANA Considerations
This document has no IANA actions.
10. Acknowledgments
TODO acknowledge.
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