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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;">https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/textureProjection.html</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;">https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/textureProjection.html#TextureProjector</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;">https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/textureProjection.html#TextureProjectorParallel</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;">https://www.web3d.org/x3d/content/examples/Basic/X3dSpecifications/TextureProjectorComponentExampleIndex.html</div>
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Thanks in advance for all feedback on these corrections, plus any implementation reports.</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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