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Internet Engineering Task Force L.R. van Kammen
Internet-Draft 24 September 2025
Intended status: Informational
XR Macros
draft-XRMACROS-leonvankammen-00
Abstract
This draft offers a specification for embedding macros in existing 3D
scenes/assets, to offer simple interactions and configure the
renderer further.
Together with URI Fragments, it allows for rich immersive experiences
without the need of a complicated sandboxed scripting languages.
Almost every idea in this document is demonstrated at
https://xrfragment.org (https://xrfragment.org), as this spec was
created during the XR Fragments (https://xrfragment.org) spec.
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 28 March 2026.
Copyright Notice
Copyright (c) 2025 IETF Trust and the persons identified as the
document authors. All rights reserved.
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
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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. Core principle . . . . . . . . . . . . . . . . . . . . . . . 2
3. Conventions and Definitions . . . . . . . . . . . . . . . . . 3
4. List of XR Macros . . . . . . . . . . . . . . . . . . . . . . 3
4.1. Usecase: click object . . . . . . . . . . . . . . . . . . 4
4.2. Usecase: conditional click object . . . . . . . . . . . . 4
4.3. Usecase: click object (roundrobin) . . . . . . . . . . . 5
4.4. Usecase: click object or URI fragment, and scene load
trigger . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.5. Usecase: present context menu with options . . . . . . . 6
4.6. Event Bubble-flow . . . . . . . . . . . . . . . . . . . . 6
5. Security Considerations . . . . . . . . . . . . . . . . . . . 7
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 7
8. Appendix: Definitions . . . . . . . . . . . . . . . . . . . . 7
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.
Their lowest common denominator is: (co)authoring using plain text.
Therefore, XR Macros allows us to enrich/connect existing
dataformats, by offering a polyglot notation based on existing
notations:
1. getting/setting common used 3D properties using querystring- or
JSON-notation
2. targeting 3D properties using the lightweight query notation
present in XR Fragments (https://xrfragment.org)
| NOTE: The chapters in this document are ordered from highlevel to
| lowlevel (technical) as much as possible
2. Core principle
1. XR Macros use querystrings, but are HTML-agnostic (though pseudo-
XR Fragment browsers *can* be implemented on top of HTML/
Javascript).
2. An XR Macro is 3D metadata which starts with '!' (!clickme:
fog=0,10 e.g.)
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3. Metadata-values can contain the | symbol to 🎲 roundrobin variable
values (!toggleme: fog=0,10|fog=0,1000 e.g.)
4. XR Macros acts as simple eventhandlers for URI Fragments: they
are automatically published on the (XR Fragments
(https://xrfragment.org)) hashbus, to act as events (so more
serious scripting languages can react to them as well).
5. XR Macros can assign object metadata (!setlocal: foo=1 writes
foo:1 metadata to the object containing the !setlocal metadata)
6. XR Macros can assign global metadata (!setfoo: #foo=1 writes
foo:1 metadata to the root scene-node)
| These very simple principles allow for rich interactions and
| dynamic querying
3. Conventions and Definitions
See appendix below in case certain terms are not clear.
4. List of XR Macros
(XR) Macros can be embedded in 3D assets/scenes.
Macros enrich existing spatial content with a lowcode, limited logic-
layer, by recursive (economic) use of the querystring syntax (which
search engines and XR Fragments (https://xrfragment.org) already
uses.
This is done by allowing string/integer variables, and the | symbol
to roundrobin variable values.
Macros also act as events, so more serious scripting languages can
react to them as well.
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+=========+======+===================+=================+=============+
|key |type |example (JSON) |function |existing |
| | | | |compatibility|
+=========+======+===================+=================+=============+
|@bg |string|"@bg":"#cube" |bg: binds fog |custom |
| | | |near/far based to|property in |
| | | |cube x/y/z (anim)|3D |
| | | |values |fileformats |
+---------+------+-------------------+-----------------+-------------+
|@fog |string|"@fog":"#cube" |fog: binds fog |custom |
| | | |near/far based to|property in |
| | | |cube x/y (anim) |3D |
| | | |values |fileformats |
+---------+------+-------------------+-----------------+-------------+
|@scroll |string|"@scroll":"#cube" |texturescrolling:|custom |
| | | |binds texture |property in |
| | | |x/y/rot based to |3D |
| | | |cube x/y/z (anim)|fileformats |
| | | |values | |
+---------+------+-------------------+-----------------+-------------+
|@emissive|string|"@emissive":"#cube"|day/night/mood: |custom |
| | | |binds material's |property in |
| | | |emissive value to|3D |
| | | |cube x/y/z (anim)|fileformats |
| | | |values | |
+---------+------+-------------------+-----------------+-------------+
Table 1
4.1. Usecase: click object
+=================+================+================+
| custom property | value | trigger when |
+=================+================+================+
| !clickme | bg=1,1,1&foo=2 | object clicked |
+-----------------+----------------+----------------+
Table 2
4.2. Usecase: conditional click object
+=================+==================+============================+
| custom property | value | trigger when |
+=================+==================+============================+
| # | foo=1 | scene |
+-----------------+------------------+----------------------------+
| !clickme | q=foo>2&bg=1,1,1 | object clicked and foo > 2 |
+-----------------+------------------+----------------------------+
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Table 3
| when a user clicks an object with the custom properties above, it
| should set the backgroundcolor to 1,1,1 when foo is greater than 2
| (see previous example)
4.3. Usecase: click object (roundrobin)
+=================+================+================+
| custom property | value | trigger when |
+=================+================+================+
| !cycleme | day|noon|night | object clicked |
+-----------------+----------------+----------------+
| day | bg=1,1,1 | roundrobin |
+-----------------+----------------+----------------+
| noon | bg=0.5,0.5,0.5 | roundrobin |
+-----------------+----------------+----------------+
| night | bg=0,0,0&foo=2 | roundrobin |
+-----------------+----------------+----------------+
Table 4
| when a user clicks an object with the custom properties above, it
| should trigger either day noon or night in roundrobin fashion.
4.4. Usecase: click object or URI fragment, and scene load trigger
+=================+================+======================+
| custom property | value | trigger when |
+=================+================+======================+
| # | random | scene loaded |
+-----------------+----------------+----------------------+
| #random | random | URL contains #random |
+-----------------+----------------+----------------------+
| !random | day|noon|night | #random, # or click |
+-----------------+----------------+----------------------+
| day | bg=1,1,1 | roundrobin |
+-----------------+----------------+----------------------+
| noon | bg=0.5,0.5,0.5 | roundrobin |
+-----------------+----------------+----------------------+
| night | bg=0,0,0&foo=2 | roundrobin |
+-----------------+----------------+----------------------+
Table 5
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4.5. Usecase: present context menu with options
+=================+================+========================+
| custom property | value | trigger when |
+=================+================+========================+
| !random | !day | !noon |
+-----------------+----------------+------------------------+
| !day | bg=1,1,1 | clicked in contextmenu |
+-----------------+----------------+------------------------+
| !noon | bg=0.5,0.5,0.5 | clicked in contextmenu |
+-----------------+----------------+------------------------+
| !night | bg=0,0,0&foo=2 | clicked in contextmenu |
+-----------------+----------------+------------------------+
Table 6
| When interacting with an object with more than one !-macro, the XR
| Browser should offer a contextmenu to execute a macro.
In a similar way, when *any* !-macro is present on the sceneroot, the
XR Browser should offer a context-menu to execute those macro's.
4.6. Event Bubble-flow
click object with (!clickme:AR or !clickme: !reset e.g.)
◻
│
└── does current object contain this property-key (`AR` or `!reset` e.g.)?
└── no: is there any (root)object containing property `AR`
└── yes: evaluate its (roundrobin) XR macro-value(s) (and exit)
└── no: trigger URL: #AR
click object with (!clickme:#AR|#VR e.g.)
◻
│
└── apply the roundrobin (rotate the options, value `#AR` becomes `#VR` upon next click)
└── is there any object with property-key (`#AR` e.g.)?
└── no: just update the URL to `#AR`
└── yes: apply its value to the scene, and update the URL to `#AR`
click object with (`!clickme`:`!foo|!bar|!flop` e.g.)
◻ │
└── apply the roundrobin (rotate the options, value !foo becomes !bar
upon next click) └── is there any object with property-key (!foo
e.g.)? └── no: do nothing └── yes: apply its value to the scene ```
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| Note that only macro's can trigger roundrobin values or
| contextmenu's, as well as roundrobin values never ending up in the
| toplevel URL.
5. Security Considerations
6. IANA Considerations
This document has no IANA actions.
7. Acknowledgments
* NLNET (https://nlnet.nl)
* Future of Text (https://futureoftext.org)
* visual-meta.info (https://visual-meta.info)
8. Appendix: Definitions
+===============+===================================================+
| definition | explanation |
+===============+===================================================+
| 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. |
+---------------+---------------------------------------------------+
| XR fragments | URI Fragment with spatial hints like |
| | #pos=0,0,0&t=1,100 e.g. |
+---------------+---------------------------------------------------+
| query | an URI Fragment-operator which queries |
| | object(s) from a scene like #q=cube |
+---------------+---------------------------------------------------+
| FPS | frames per second in spatial experiences |
| | (games,VR,AR e.g.), should be as high as |
| | possible |
+---------------+---------------------------------------------------+
| ◻ | ascii representation of an 3D object/mesh |
+---------------+---------------------------------------------------+
| (un)obtrusive | obtrusive: wrapping human text/thought in |
| | XML/HTML/JSON obfuscates human text into |
| | a salad of machine-symbols and words |
+---------------+---------------------------------------------------+
Table 7
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