195 lines
9.0 KiB
Markdown
195 lines
9.0 KiB
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Title = "XR Fragments"
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area = "Internet"
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workgroup = "Internet Engineering Task Force"
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[seriesInfo]
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name = "XR-Fragments"
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value = "draft-XRFRAGMENTS-leonvankammen-00"
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stream = "IETF"
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status = "informational"
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date = 2023-04-12T00:00:00Z
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[[author]]
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initials="L.R."
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surname="van Kammen"
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fullname="L.R. van Kammen"
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<!-- for annotated version see: https://raw.githubusercontent.com/ietf-tools/rfcxml-templates-and-schemas/main/draft-rfcxml-general-template-annotated-00.xml -->
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<br>
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<h1>XR Fragments</h1>
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<br>
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<pre>
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stream: IETF
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area: Internet
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status: informational
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author: Leon van Kammen
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date: 2023-04-12T00:00:00Z
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workgroup: Internet Engineering Task Force
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value: draft-XRFRAGMENTS-leonvankammen-00
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</pre>
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}-->
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.# Abstract
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This draft offers a specification for 4D URLs & navigation, to link 3D scenes and text together with- or without a network-connection.<br>
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The specification promotes spatial addressibility, sharing, navigation, query-ing and tagging interactive (text)objects across for (XR) Browsers.<br>
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XR Fragments allows us to enrich existing dataformats, by recursive use of existing proven technologies like [URI Fragments](https://en.wikipedia.org/wiki/URI_fragment) and BibTags notation.<br>
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> Almost every idea in this document is demonstrated at [https://xrfragment.org](https://xrfragment.org)
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{mainmatter}
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# Introduction
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How can we add more features to existing text & 3D scenes, without introducing new dataformats?<br>
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Historically, there's many attempts to create the ultimate markuplanguage or 3D fileformat.<br>
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Their lowest common denominator is: (co)authoring using plain text.<br>
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Therefore, XR Macros allows us to enrich/connect existing dataformats, by offering a polyglot notation based on existing notations:<br>
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1. getting/setting common used 3D properties using querystring- or JSON-notation
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> NOTE: The chapters in this document are ordered from highlevel to lowlevel (technical) as much as possible
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# Core principle
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1. XR Macros use querystrings, but are HTML-agnostic (though pseudo-XR Fragment browsers **can** be implemented on top of HTML/Javascript).
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1. XR Macros represents setting/getting common used properties found in all popular 3D frameworks/(game)editors/internet browsers.
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# Conventions and Definitions
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See appendix below in case certain terms are not clear.
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# List of XR Macros
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(XR) Macros can be embedded in 3D assets/scenes.<br></br
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Macros allow a limited logic-layer, by recursive (economic) use of the querystring syntax (which the XR Fragment parser already uses).<br>
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The only addition is the `|` symbol to roundrobin variable values.<br>
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Macros also act as events, so more serious scripting languages can react to them as well.<br>
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| custom property | value | assign (rr) variable ? | execute opcode? | show contextmenu? |
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|-----------------|--------------------------|------------------------|-----------------|-------------------------------------------|
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| !clickme | day|noon|night | yes | not yet | only when multiple props start with ! |
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| day | bg=1,1,1 | no | yes | no |
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| noon | bg=0.5,0.5,0.5 | yes | yes | no |
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| night | bg=0,0,0&foo=2 | yes | yes | no |
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---
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| custom property | value | assign (rr) variable ? | execute opcode? | show contextmenu? |
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|--------------------|--------------------------|------------------------|-----------------|-----------------------------|
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| !turnofflights | night | no | yes | yes because of !clickme |
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| !clickme | day|noon|night | yes | not yet | yes because of !clickme |
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| day | bg=1,1,1 | no | yes | no |
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| noon | bg=0.5,0.5,0.5 | yes | yes | no |
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| night | bg=0,0,0&foo=2 | yes | yes | no |
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lazy evaluation:
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| custom property | value | copy verbatim to URL? | (rr) variable [assingment]? |
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|-----------------|--------------------------|-----------------------|-----------------------------|
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| href | #cyclepreset | yes | no |
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| cyclepreset | day|noon|night | no | (yes) yes |
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| day | bg=1,1,1 | no | yes [yes] |
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| noon | bg=0.5,0.5,0.5 | no | yes [yes] |
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| night | bg=0,0,0&foo=2 | no | yes [yes] |
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# Security Considerations
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# IANA Considerations
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This document has no IANA actions.
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# Acknowledgments
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* [NLNET](https://nlnet.nl)
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* [Future of Text](https://futureoftext.org)
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* [visual-meta.info](https://visual-meta.info)
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# Appendix: Definitions
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|definition | explanation |
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|----------------------|-------------------------------------------------------------------------------------------------------------------------------|
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|human | a sentient being who thinks fuzzy, absorbs, and shares thought (by plain text, not markuplanguage) |
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|scene | a (local/remote) 3D scene or 3D file (index.gltf e.g.) |
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|3D object | an object inside a scene characterized by vertex-, face- and customproperty data. |
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|metadata | custom properties of text, 3D Scene or Object(nodes), relevant to machines and a human minority (academics/developers) |
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|XR fragment | URI Fragment with spatial hints like `#pos=0,0,0&t=1,100` e.g. |
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|src | (HTML-piggybacked) metadata of a 3D object which instances content |
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|href | (HTML-piggybacked) metadata of a 3D object which links to content |
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|query | an URI Fragment-operator which queries object(s) from a scene like `#q=cube` |
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|visual-meta | [visual-meta](https://visual.meta.info) data appended to text/books/papers which is indirectly visible/editable in XR. |
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|requestless metadata | metadata which never spawns new requests (unlike RDF/HTML, which can cause framerate-dropping, hence not used a lot in games) |
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|FPS | frames per second in spatial experiences (games,VR,AR e.g.), should be as high as possible |
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|introspective | inward sensemaking ("I feel this belongs to that") |
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|extrospective | outward sensemaking ("I'm fairly sure John is a person who lives in oklahoma") |
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|`◻` | ascii representation of an 3D object/mesh |
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|(un)obtrusive | obtrusive: wrapping human text/thought in XML/HTML/JSON obfuscates human text into a salad of machine-symbols and words |
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|BibTeX | simple tagging/citing/referencing standard for plaintext |
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|BibTag | a BibTeX tag |
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