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Hi Holger - great to hear of your interest and efforts, thank you.</div>
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Am thinking the default upVector ought to point in the "up" direction expected by users.</div>
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<div class="elementToProof">Wikipedia: Principle of least astonishment</div>
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<div class="elementToProof">https://en.wikipedia.org/wiki/Principle_of_least_astonishment</div>
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The following member-only resources for X3D 4.1 have been updated to track this issue.</div>
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<div class="elementToProof">Mantis 1481: upVector field for TextureProjector, TextureProjectorParallel nodes</div>
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<div class="elementToProof">https://mantis.web3d.org/view.php?id=1481</div>
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<div class="elementToProof">Github version control</div>
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Also happy to announce that draft X3D 4.1 </div>
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<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: "Courier New"; font-size: 9pt;">all the best, Don</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: "Courier New"; font-size: 9pt;">--</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: "Courier New"; font-size: 9pt;">Don Brutzman Naval Postgraduate School, Code USW/Br brutzman@nps.edu</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: "Courier New"; font-size: 9pt;">Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: "Courier New"; font-size: 9pt;">X3D graphics, virtual worlds, navy robotics https://faculty.nps.edu/brutzman</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> Holger Seelig <holger.seelig@yahoo.de><br>
<b>Sent:</b> Sunday, December 8, 2024 1:12 AM<br>
<b>To:</b> X3D <x3d-public@web3d.org><br>
<b>Cc:</b> Brutzman, Donald (Don) (CIV) <brutzman@nps.edu>; khyoo@chungbuk.ac.kr <khyoo@chungbuk.ac.kr>; Myeong Won Lee <myeongwonlee@gmail.com><br>
<b>Subject:</b> Re: [x3d-public] X3D 4.0 specification problem: upVector field for TextureProjector, TextureProjectorParallel</span></div>
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<div>That is very good news. I will update X_ITE accordingly.</div>
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<div>Maybe now is also the time to change the *direction* vector to (-1 -1 -1) on the example page
<a href="https://www.web3d.org/x3d/content/examples/Basic/X3dSpecifications/TextureProjectorComponentExampleIndex.html" id="OWAad80868d-97c2-c267-6ea7-0a28a91bc7ad" class="OWAAutoLink" data-auth="NotApplicable">
https://www.web3d.org/x3d/content/examples/Basic/X3dSpecifications/TextureProjectorComponentExampleIndex.html</a>, then the projector would point exactly into the corner of the model.</div>
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<div>Best regards,</div>
<div>Holger</div>
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--</div>
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Holger Seelig</div>
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Leipzig, Germany</div>
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holger.seelig@yahoo.de</div>
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https://create3000.github.io/x_ite/</div>
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<div>Am 08.12.2024 um 05:21 schrieb Brutzman, Donald (Don) (CIV) via x3d-public <x3d-public@web3d.org>:</div>
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While performing regression testing using X3D Examples Archive, found several problems related to the upVector field.</div>
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First, upVector is defined in X3D Architecture specification for TextureProjector node but not TextureProjectorParallel node. However the corresponding figures illustrate that upVector is an integral part of each node's definition.</div>
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Second, the default value is "0 0 1" but this looks wrong (rotated confusingly), and a much-more intuitive value is "0 1 0" with y-axis up. In other words, the default upVector direction ought to point upwards. This is the default relationship is shown in
both figures and the specification example for TextureProjector.</div>
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<div style="direction: ltr;">X3D 4.0 Architecture, clause 42 Texture projection component</div>
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<div style="direction: ltr;"><a href="https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/textureProjection.html" id="OWA02806e08-961d-b952-a850-7dd1803424c8" class="OWAAutoLink" data-auth="NotApplicable">https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/textureProjection.html</a></div>
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<div style="direction: ltr;">42.3.1 X3DTextureProjectorNode</div>
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<div style="direction: ltr;">42.4.1 TextureProjector</div>
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<div style="direction: ltr;">Figure 42.5 — Description of 3D perspective texture projection</div>
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<div style="direction: ltr;">"The <i>upVector</i> describes the roll of the camera by saying which point is "up" in the camera's orientation. The default value of this field is (0 0 1)."</div>
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<div style="direction: ltr;"><a href="https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/textureProjection.html#TextureProjector" id="OWA06a5488b-4625-03b1-9b2a-105c98c31918" class="OWAAutoLink" data-auth="NotApplicable">https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/textureProjection.html#TextureProjector</a></div>
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<div style="direction: ltr;">42.4.2 TextureProjectorParallel</div>
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<div style="direction: ltr;">Figure 42.4 —Description of 3D parallel texture projection</div>
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<div style="direction: ltr;"><a href="https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/textureProjection.html#TextureProjectorParallel" id="OWA7979646f-12ea-0e65-2675-eddb97486ff2" class="OWAAutoLink" data-auth="NotApplicable">https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/textureProjection.html#TextureProjectorParallel</a></div>
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Third, I am unable to find a working implementation for these nodes, though we have seen FreeWrl (at least) working in the past.</div>
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Recommended specification remedies:</div>
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<div style="direction: ltr;">Include upVector field in TextureProjectorParallel node and shared node type X3DTextureProjectorNode</div>
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<div style="direction: ltr;">Change default values to "0 1 0"</div>
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<div style="direction: ltr;">Include an example for TextureProjectorParallel node, similar to TextureProjector node</div>
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<div style="direction: ltr;">Fix erroneous figure labels so that they are properly numbered</div>
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<div style="direction: ltr;">Update Mantis error tracker, various validation tools, X3D Tooltips, X3DJSAIL and X3DPSAIL x3d.py, etc.</div>
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<div style="direction: ltr;">Encourage, hopefully ensure that multiple browser implementations are available.</div>
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Test scene:</div>
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<div style="direction: ltr;">X3D Example Archives: Basic, X3D Specifications, Texture Projector Component Example</div>
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<div style="direction: ltr;"><a href="https://www.web3d.org/x3d/content/examples/Basic/X3dSpecifications/TextureProjectorComponentExampleIndex.html" id="OWA45c56735-12e9-1add-33b4-a108d0d2b537" class="OWAAutoLink" data-auth="NotApplicable">https://www.web3d.org/x3d/content/examples/Basic/X3dSpecifications/TextureProjectorComponentExampleIndex.html</a></div>
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Thanks in advance for all feedback on these corrections, plus any implementation reports.</div>
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<div style="margin: 0in; font-family: "Courier New"; font-size: 9pt;">all the best, Don</div>
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<div style="margin: 0in; font-family: "Courier New"; font-size: 9pt;">Don Brutzman Naval Postgraduate School, Code USW/Br <a href="mailto:brutzman@nps.edu" id="OWAe5846cfa-a3e9-f819-15de-baae78317feb" class="OWAAutoLink">brutzman@nps.edu</a></div>
<div style="margin: 0in; font-family: "Courier New"; font-size: 9pt;">Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149</div>
<div style="margin: 0in; font-family: "Courier New"; font-size: 9pt;">X3D graphics, virtual worlds, navy robotics
<a href="https://faculty.nps.edu/brutzman" id="OWA4cbb3516-b051-2c19-16e3-acea25cb25e9" class="OWAAutoLink" data-auth="NotApplicable">
https://faculty.nps.edu/brutzman</a></div>
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