main: update documentation
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5 changed files with 177 additions and 123 deletions
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@ -1507,6 +1507,25 @@ Therefore a 2-button navigation-interface is the bare minimum interface:</p>
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<li>the TTS reads the href-value (and/or aria-description if available)</li>
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<li>the TTS reads the href-value (and/or aria-description if available)</li>
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</ol>
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</ol>
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<h2 id="overlap-with-fileformat-specific-extensions">Overlap with fileformat-specific extensions</h2>
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<p>Some 3D scene-fileformats have support for extensions.
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What if the functionality of those overlap?
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For example, GLTF has the <code>OMI_LINK</code> extension which might overlap with XR Fragment’s <code>href</code>:</p>
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<blockquote>
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<p>Priority Order and Precedence</p>
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</blockquote>
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<p>1.Extensions Take Precedence: Since glTF-specific extensions are designed with the format’s
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specific needs and optimizations in mind, they should take precedence over extras metadata
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in cases where both contain overlapping functionality.
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This approach aligns with the idea that extensions are more likely to be interpreted uniformly by glTF-compatible software.</p>
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<ol start="2">
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<li>Fallback Mechanism: If a glTF implementation does not support a particular extension, the extras field can serve as a fallback. This way, metadata provided in extras can still be useful for applications that don’t handle certain extensions.</li>
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</ol>
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<h2 id="vendor-prefixes">Vendor Prefixes</h2>
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<h2 id="vendor-prefixes">Vendor Prefixes</h2>
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<p>Vendor-specific metadata in a 3D scenefiles, are similar to vendor-specific <a href="https://en.wikipedia.org/wiki/CSS#Vendor_prefixes">CSS-prefixes</a> (<code>-moz-opacity: 0.2</code> e.g.).
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<p>Vendor-specific metadata in a 3D scenefiles, are similar to vendor-specific <a href="https://en.wikipedia.org/wiki/CSS#Vendor_prefixes">CSS-prefixes</a> (<code>-moz-opacity: 0.2</code> e.g.).
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@ -1576,8 +1595,9 @@ The lowest common denominator between 3D engines is the ‘entity’-par
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│ | ├─ -godot-Label3D.text: '{name}{age}'| > inits 'Label3D' component (*) in Godot │
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│ | ├─ -godot-Label3D.text: '{name}{age}'| > inits 'Label3D' component (*) in Godot │
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│ +--------+ | │
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│ +--------+ | │
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│ | │
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│ | │
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├─ -AFRAME-version: '1.6.0' | > │
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├─ -GODOT-version: '4.3' | > exporters/authors can report targeted version │
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├─ -GODOT-version: '4.3' | > exporters/authors can report targeted version │
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├─ -AFRAME-version: '1.6.0' | and (optionally) hint component-repo│
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├─ -AFRAME-info: 'https://git.benetou.fr/comps' │
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│ | │
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│ | │
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+────────────────────────────────────────────────────────────────────────────────────────────────────────+
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+────────────────────────────────────────────────────────────────────────────────────────────────────────+
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</code></pre>
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</code></pre>
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@ -955,6 +955,21 @@ Therefore a 2-button navigation-interface is the bare minimum interface:
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2. objects with href metadata can be activated via a key (enter on a keyboard)
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2. objects with href metadata can be activated via a key (enter on a keyboard)
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3. the TTS reads the href-value (and/or aria-description if available)
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3. the TTS reads the href-value (and/or aria-description if available)
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## Overlap with fileformat-specific extensions
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Some 3D scene-fileformats have support for extensions.
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What if the functionality of those overlap?
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For example, GLTF has the `OMI_LINK` extension which might overlap with XR Fragment's `href`:
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> Priority Order and Precedence
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1.Extensions Take Precedence: Since glTF-specific extensions are designed with the format’s
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specific needs and optimizations in mind, they should take precedence over extras metadata
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in cases where both contain overlapping functionality.
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This approach aligns with the idea that extensions are more likely to be interpreted uniformly by glTF-compatible software.
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2. Fallback Mechanism: If a glTF implementation does not support a particular extension, the extras field can serve as a fallback. This way, metadata provided in extras can still be useful for applications that don't handle certain extensions.
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## Vendor Prefixes
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## Vendor Prefixes
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Vendor-specific metadata in a 3D scenefiles, are similar to vendor-specific [CSS-prefixes](https://en.wikipedia.org/wiki/CSS#Vendor_prefixes) (`-moz-opacity: 0.2` e.g.).
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Vendor-specific metadata in a 3D scenefiles, are similar to vendor-specific [CSS-prefixes](https://en.wikipedia.org/wiki/CSS#Vendor_prefixes) (`-moz-opacity: 0.2` e.g.).
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@ -3,7 +3,7 @@
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Jens & Leon Internet Engineering Task Force L.R. van Kammen
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Jens & Leon Internet Engineering Task Force L.R. van Kammen
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Internet-Draft 20 September 2024
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Internet-Draft 24 September 2024
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Intended status: Informational
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Intended status: Informational
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@ -46,14 +46,14 @@ Status of This Memo
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time. It is inappropriate to use Internet-Drafts as reference
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time. It is inappropriate to use Internet-Drafts as reference
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material or to cite them other than as "work in progress."
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material or to cite them other than as "work in progress."
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This Internet-Draft will expire on 24 March 2025.
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This Internet-Draft will expire on 28 March 2025.
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van Kammen Expires 24 March 2025 [Page 1]
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van Kammen Expires 28 March 2025 [Page 1]
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Internet-Draft XR Fragments September 2024
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Internet-Draft XR Fragments September 2024
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@ -75,7 +75,7 @@ Copyright Notice
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Table of Contents
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Table of Contents
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1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
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1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
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2. Core principle . . . . . . . . . . . . . . . . . . . . . . . 3
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2. Core principle . . . . . . . . . . . . . . . . . . . . . . . 4
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3. Hypermediatic FeedbackLoop for XR browsers . . . . . . . . . 5
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3. Hypermediatic FeedbackLoop for XR browsers . . . . . . . . . 5
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4. Conventions and Definitions . . . . . . . . . . . . . . . . . 8
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4. Conventions and Definitions . . . . . . . . . . . . . . . . . 8
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4.1. XR Fragment URL Grammar . . . . . . . . . . . . . . . . . 8
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4.1. XR Fragment URL Grammar . . . . . . . . . . . . . . . . . 8
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@ -109,7 +109,7 @@ Table of Contents
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van Kammen Expires 24 March 2025 [Page 2]
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van Kammen Expires 28 March 2025 [Page 2]
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Internet-Draft XR Fragments September 2024
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Internet-Draft XR Fragments September 2024
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@ -118,10 +118,11 @@ Internet-Draft XR Fragments September 2024
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23. Additional scene metadata . . . . . . . . . . . . . . . . . . 32
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23. Additional scene metadata . . . . . . . . . . . . . . . . . . 32
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24. Accessibility interface . . . . . . . . . . . . . . . . . . . 33
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24. Accessibility interface . . . . . . . . . . . . . . . . . . . 33
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24.1. Two-button navigation . . . . . . . . . . . . . . . . . 34
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24.1. Two-button navigation . . . . . . . . . . . . . . . . . 34
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24.2. Vendor Prefixes . . . . . . . . . . . . . . . . . . . . 35
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24.2. Overlap with fileformat-specific extensions . . . . . . 35
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24.3. Vendor Prefixes . . . . . . . . . . . . . . . . . . . . 35
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25. Security Considerations . . . . . . . . . . . . . . . . . . . 37
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25. Security Considerations . . . . . . . . . . . . . . . . . . . 37
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26. FAQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
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26. FAQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
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27. authors . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
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27. authors . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
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28. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 38
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28. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 38
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29. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 38
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29. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 38
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30. Appendix: Definitions . . . . . . . . . . . . . . . . . . . . 38
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30. Appendix: Definitions . . . . . . . . . . . . . . . . . . . . 38
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@ -158,18 +159,22 @@ Internet-Draft XR Fragments September 2024
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| NOTE: The chapters in this document are ordered from highlevel to
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| NOTE: The chapters in this document are ordered from highlevel to
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| lowlevel (technical) as much as possible
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| lowlevel (technical) as much as possible
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Internet-Draft XR Fragments September 2024
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2. Core principle
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2. Core principle
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*XR Fragments allows controlling 3D models using URLs, based on
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*XR Fragments allows controlling 3D models using URLs, based on
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(non)existing metadata via URI's*
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(non)existing metadata via URI's*
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van Kammen Expires 24 March 2025 [Page 3]
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Internet-Draft XR Fragments September 2024
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XR Fragments tries to seek to connect the world of text (semantical
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XR Fragments tries to seek to connect the world of text (semantical
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web / RDF), and the world of pixels.
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web / RDF), and the world of pixels.
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Instead of forcing authors to combine 3D/2D objects programmatically
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Instead of forcing authors to combine 3D/2D objects programmatically
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van Kammen Expires 24 March 2025 [Page 5]
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van Kammen Expires 24 March 2025 [Page 6]
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van Kammen Expires 24 March 2025 [Page 24]
|
van Kammen Expires 28 March 2025 [Page 24]
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
@ -1397,7 +1397,7 @@ Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 25]
|
van Kammen Expires 28 March 2025 [Page 25]
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
@ -1453,7 +1453,7 @@ Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 26]
|
van Kammen Expires 28 March 2025 [Page 26]
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
@ -1509,7 +1509,7 @@ Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 27]
|
van Kammen Expires 28 March 2025 [Page 27]
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
@ -1565,7 +1565,7 @@ Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 28]
|
van Kammen Expires 28 March 2025 [Page 28]
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
@ -1621,7 +1621,7 @@ Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 29]
|
van Kammen Expires 28 March 2025 [Page 29]
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
@ -1677,7 +1677,7 @@ Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 30]
|
van Kammen Expires 28 March 2025 [Page 30]
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
@ -1733,7 +1733,7 @@ Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 31]
|
van Kammen Expires 28 March 2025 [Page 31]
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
@ -1789,7 +1789,7 @@ Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 32]
|
van Kammen Expires 28 March 2025 [Page 32]
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
@ -1845,7 +1845,7 @@ Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 33]
|
van Kammen Expires 28 March 2025 [Page 33]
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
@ -1901,12 +1901,32 @@ Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 34]
|
van Kammen Expires 28 March 2025 [Page 34]
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
24.2. Vendor Prefixes
|
24.2. Overlap with fileformat-specific extensions
|
||||||
|
|
||||||
|
Some 3D scene-fileformats have support for extensions. What if the
|
||||||
|
functionality of those overlap? For example, GLTF has the OMI_LINK
|
||||||
|
extension which might overlap with XR Fragment's href:
|
||||||
|
|
||||||
|
| Priority Order and Precedence
|
||||||
|
|
||||||
|
1.Extensions Take Precedence: Since glTF-specific extensions are
|
||||||
|
designed with the format’s specific needs and optimizations in mind,
|
||||||
|
they should take precedence over extras metadata in cases where both
|
||||||
|
contain overlapping functionality. This approach aligns with the
|
||||||
|
idea that extensions are more likely to be interpreted uniformly by
|
||||||
|
glTF-compatible software.
|
||||||
|
|
||||||
|
2. Fallback Mechanism: If a glTF implementation does not support a
|
||||||
|
particular extension, the extras field can serve as a fallback.
|
||||||
|
This way, metadata provided in extras can still be useful for
|
||||||
|
applications that don't handle certain extensions.
|
||||||
|
|
||||||
|
24.3. Vendor Prefixes
|
||||||
|
|
||||||
Vendor-specific metadata in a 3D scenefiles, are similar to vendor-
|
Vendor-specific metadata in a 3D scenefiles, are similar to vendor-
|
||||||
specific CSS-prefixes (https://en.wikipedia.org/wiki/
|
specific CSS-prefixes (https://en.wikipedia.org/wiki/
|
||||||
|
|
@ -1932,6 +1952,16 @@ Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
Table 14
|
Table 14
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
van Kammen Expires 28 March 2025 [Page 35]
|
||||||
|
|
||||||
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
| Why? Because not all XR interactions can/should be solved/
|
| Why? Because not all XR interactions can/should be solved/
|
||||||
| standardized by embedding XR Fragments into any 3D file. The
|
| standardized by embedding XR Fragments into any 3D file. The
|
||||||
| lowest common denominator between 3D engines is the 'entity'-part
|
| lowest common denominator between 3D engines is the 'entity'-part
|
||||||
|
|
@ -1941,27 +1971,6 @@ Internet-Draft XR Fragments September 2024
|
||||||
For example, the following metadata can be added to a .glb file, to
|
For example, the following metadata can be added to a .glb file, to
|
||||||
make an object grabbable in AFRAME:
|
make an object grabbable in AFRAME:
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 35]
|
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
|
||||||
|
|
||||||
|
|
||||||
+────────────────────────────────────────────────────────────────────────────────────────────────────────+
|
+────────────────────────────────────────────────────────────────────────────────────────────────────────+
|
||||||
│ http://y.io/z.glb | AFRAME app │
|
│ http://y.io/z.glb | AFRAME app │
|
||||||
│-----------------------------------------------+--------------------------------------------------------│
|
│-----------------------------------------------+--------------------------------------------------------│
|
||||||
|
|
@ -1987,8 +1996,9 @@ Internet-Draft XR Fragments September 2024
|
||||||
│ | ├─ -godot-Label3D.text: '{name}{age}'| > inits 'Label3D' component (*) in Godot │
|
│ | ├─ -godot-Label3D.text: '{name}{age}'| > inits 'Label3D' component (*) in Godot │
|
||||||
│ +--------+ | │
|
│ +--------+ | │
|
||||||
│ | │
|
│ | │
|
||||||
├─ -AFRAME-version: '1.6.0' | > │
|
|
||||||
├─ -GODOT-version: '4.3' | > exporters/authors can report targeted version │
|
├─ -GODOT-version: '4.3' | > exporters/authors can report targeted version │
|
||||||
|
├─ -AFRAME-version: '1.6.0' | and (optionally) hint component-repo│
|
||||||
|
├─ -AFRAME-info: 'https://git.benetou.fr/comps' │
|
||||||
│ | │
|
│ | │
|
||||||
+────────────────────────────────────────────────────────────────────────────────────────────────────────+
|
+────────────────────────────────────────────────────────────────────────────────────────────────────────+
|
||||||
|
|
||||||
|
|
@ -1998,26 +2008,22 @@ Internet-Draft XR Fragments September 2024
|
||||||
String-templatevalues are evaluated as per URI Templates (RFC6570)
|
String-templatevalues are evaluated as per URI Templates (RFC6570)
|
||||||
(https://www.rfc-editor.org/rfc/rfc6570) Level 1.
|
(https://www.rfc-editor.org/rfc/rfc6570) Level 1.
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
van Kammen Expires 28 March 2025 [Page 36]
|
||||||
|
|
||||||
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
| This 'separating of mechanism from policy' (unix rule) does
|
| This 'separating of mechanism from policy' (unix rule) does
|
||||||
| *somewhat* break portability of an XR experience, but still
|
| *somewhat* break portability of an XR experience, but still
|
||||||
| prevents (E-waste of) handcoded virtual worlds. It allows for (XR
|
| prevents (E-waste of) handcoded virtual worlds. It allows for (XR
|
||||||
| experience) metadata to survive in future 3D engines and scene-
|
| experience) metadata to survive in future 3D engines and scene-
|
||||||
| fileformats.
|
| fileformats.
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 36]
|
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
|
||||||
|
|
||||||
|
|
||||||
25. Security Considerations
|
25. Security Considerations
|
||||||
|
|
||||||
The only dynamic parts are W3C Media Fragments
|
The only dynamic parts are W3C Media Fragments
|
||||||
|
|
@ -2061,19 +2067,18 @@ Internet-Draft XR Fragments September 2024
|
||||||
place, to 'extend' experiences, in contrast to code/javascript inside
|
place, to 'extend' experiences, in contrast to code/javascript inside
|
||||||
hypermedia documents (this turned out as a hypermedia antipattern).
|
hypermedia documents (this turned out as a hypermedia antipattern).
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
van Kammen Expires 28 March 2025 [Page 37]
|
||||||
|
|
||||||
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
27. authors
|
27. authors
|
||||||
|
|
||||||
* Leon van Kammen (@lvk@mastodon.online)
|
* Leon van Kammen (@lvk@mastodon.online)
|
||||||
* Jens Finkhäuser (@jens@social.finkhaeuser.de)
|
* Jens Finkhäuser (@jens@social.finkhaeuser.de)
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 37]
|
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
|
||||||
|
|
||||||
|
|
||||||
28. IANA Considerations
|
28. IANA Considerations
|
||||||
|
|
||||||
This document has no IANA actions.
|
This document has no IANA actions.
|
||||||
|
|
@ -2117,19 +2122,19 @@ Internet-Draft XR Fragments September 2024
|
||||||
| | (http://me.com/foo.glb) |
|
| | (http://me.com/foo.glb) |
|
||||||
+-----------------+---------------------------------------------+
|
+-----------------+---------------------------------------------+
|
||||||
| URN | something at some domain (me.com/foo.glb) |
|
| URN | something at some domain (me.com/foo.glb) |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
van Kammen Expires 28 March 2025 [Page 38]
|
||||||
|
|
||||||
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
+-----------------+---------------------------------------------+
|
+-----------------+---------------------------------------------+
|
||||||
| metadata | custom properties of text, 3D Scene or |
|
| metadata | custom properties of text, 3D Scene or |
|
||||||
| | Object(nodes), relevant to machines and a |
|
| | Object(nodes), relevant to machines and a |
|
||||||
| | human minority (academics/developers) |
|
| | human minority (academics/developers) |
|
||||||
+-----------------+---------------------------------------------+
|
+-----------------+---------------------------------------------+
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 38]
|
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
|
||||||
|
|
||||||
|
|
||||||
| XR fragment | URI Fragment with spatial hints like |
|
| XR fragment | URI Fragment with spatial hints like |
|
||||||
| | #pos=0,0,0&t=1,100 e.g. |
|
| | #pos=0,0,0&t=1,100 e.g. |
|
||||||
+-----------------+---------------------------------------------+
|
+-----------------+---------------------------------------------+
|
||||||
|
|
@ -2173,19 +2178,19 @@ Internet-Draft XR Fragments September 2024
|
||||||
| | possible |
|
| | possible |
|
||||||
+-----------------+---------------------------------------------+
|
+-----------------+---------------------------------------------+
|
||||||
| introspective | inward sensemaking ("I feel this belongs to |
|
| introspective | inward sensemaking ("I feel this belongs to |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
van Kammen Expires 28 March 2025 [Page 39]
|
||||||
|
|
||||||
|
Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
| | that") |
|
| | that") |
|
||||||
+-----------------+---------------------------------------------+
|
+-----------------+---------------------------------------------+
|
||||||
| extrospective | outward sensemaking ("I'm fairly sure John |
|
| extrospective | outward sensemaking ("I'm fairly sure John |
|
||||||
| | is a person who lives in oklahoma") |
|
| | is a person who lives in oklahoma") |
|
||||||
+-----------------+---------------------------------------------+
|
+-----------------+---------------------------------------------+
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 39]
|
|
||||||
|
|
||||||
Internet-Draft XR Fragments September 2024
|
|
||||||
|
|
||||||
|
|
||||||
| ◻ | ascii representation of an 3D object/mesh |
|
| ◻ | ascii representation of an 3D object/mesh |
|
||||||
+-----------------+---------------------------------------------+
|
+-----------------+---------------------------------------------+
|
||||||
| (un)obtrusive | obtrusive: wrapping human text/thought in |
|
| (un)obtrusive | obtrusive: wrapping human text/thought in |
|
||||||
|
|
@ -2232,9 +2237,4 @@ Internet-Draft XR Fragments September 2024
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
van Kammen Expires 28 March 2025 [Page 40]
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
van Kammen Expires 24 March 2025 [Page 40]
|
|
||||||
|
|
|
||||||
|
|
@ -1346,6 +1346,21 @@ Therefore a 2-button navigation-interface is the bare minimum interface:</t>
|
||||||
</ol>
|
</ol>
|
||||||
</section>
|
</section>
|
||||||
|
|
||||||
|
<section anchor="overlap-with-fileformat-specific-extensions"><name>Overlap with fileformat-specific extensions</name>
|
||||||
|
<t>Some 3D scene-fileformats have support for extensions.
|
||||||
|
What if the functionality of those overlap?
|
||||||
|
For example, GLTF has the <tt>OMI_LINK</tt> extension which might overlap with XR Fragment's <tt>href</tt>:</t>
|
||||||
|
<blockquote><t>Priority Order and Precedence</t>
|
||||||
|
</blockquote><t>1.Extensions Take Precedence: Since glTF-specific extensions are designed with the format’s
|
||||||
|
specific needs and optimizations in mind, they should take precedence over extras metadata
|
||||||
|
in cases where both contain overlapping functionality.
|
||||||
|
This approach aligns with the idea that extensions are more likely to be interpreted uniformly by glTF-compatible software.</t>
|
||||||
|
|
||||||
|
<ol spacing="compact" start="2">
|
||||||
|
<li>Fallback Mechanism: If a glTF implementation does not support a particular extension, the extras field can serve as a fallback. This way, metadata provided in extras can still be useful for applications that don't handle certain extensions.</li>
|
||||||
|
</ol>
|
||||||
|
</section>
|
||||||
|
|
||||||
<section anchor="vendor-prefixes"><name>Vendor Prefixes</name>
|
<section anchor="vendor-prefixes"><name>Vendor Prefixes</name>
|
||||||
<t>Vendor-specific metadata in a 3D scenefiles, are similar to vendor-specific <eref target="https://en.wikipedia.org/wiki/CSS#Vendor_prefixes">CSS-prefixes</eref> (<tt>-moz-opacity: 0.2</tt> e.g.).
|
<t>Vendor-specific metadata in a 3D scenefiles, are similar to vendor-specific <eref target="https://en.wikipedia.org/wiki/CSS#Vendor_prefixes">CSS-prefixes</eref> (<tt>-moz-opacity: 0.2</tt> e.g.).
|
||||||
This allows popular 3D engines/frameworks, to initialize specific features when loading a scene/object, in a progressive enhanced way.</t>
|
This allows popular 3D engines/frameworks, to initialize specific features when loading a scene/object, in a progressive enhanced way.</t>
|
||||||
|
|
@ -1407,8 +1422,9 @@ The lowest common denominator between 3D engines is the 'entity'-part of their e
|
||||||
│ | ├─ -godot-Label3D.text: '{name}{age}'| > inits 'Label3D' component (*) in Godot │
|
│ | ├─ -godot-Label3D.text: '{name}{age}'| > inits 'Label3D' component (*) in Godot │
|
||||||
│ +--------+ | │
|
│ +--------+ | │
|
||||||
│ | │
|
│ | │
|
||||||
├─ -AFRAME-version: '1.6.0' | > │
|
|
||||||
├─ -GODOT-version: '4.3' | > exporters/authors can report targeted version │
|
├─ -GODOT-version: '4.3' | > exporters/authors can report targeted version │
|
||||||
|
├─ -AFRAME-version: '1.6.0' | and (optionally) hint component-repo│
|
||||||
|
├─ -AFRAME-info: 'https://git.benetou.fr/comps' │
|
||||||
│ | │
|
│ | │
|
||||||
+────────────────────────────────────────────────────────────────────────────────────────────────────────+
|
+────────────────────────────────────────────────────────────────────────────────────────────────────────+
|
||||||
]]>
|
]]>
|
||||||
|
|
|
||||||
11
index.html
11
index.html
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Add table
Reference in a new issue