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<p class="MsoNormal">Dick and I reviewed this closely and said the following in Mantis 978:</p>
<p class="MsoNormal"><a href="https://www.web3d.org/member-only/mantis/view.php?id=978">https://www.web3d.org/member-only/mantis/view.php?id=978</a></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Possible changes to figure:<br>
<br>
a. Need coordinates indicated for R axis,<br>
b. Might omit R=0 and R=1/2 (as shown in existing specification),<br>
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Possible changes to prose:<br>
<br>
c. (s,t,r) should be ordered as (r,s,t), or<br>
d. Likely should use (u,v,w) instead to match common convention as shown in<br>
<a href="https://en.wikipedia.org/wiki/UVW_mapping">https://en.wikipedia.org/wiki/UVW_mapping</a> (UVW mapping) or<br>
we informally found in OpenGL specification.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Recommend amending figure lower-case u,v,w – again thanks Vince.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">all the best, Don<br>
<span style="font-family:"Courier New"">-- <br>
Don Brutzman Naval Postgraduate School, Code USW/Br brutzman@nps.edu<br>
Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149<br>
X3D graphics, virtual worlds, navy robotics <a href="http://faculty.nps.edu/brutzman">
http://faculty.nps.edu/brutzman</a></span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="border:none;padding:0in"><b>From: </b><a href="mailto:vmarchetti@kshell.com">vmarchetti@kshell.com</a><br>
<b>Sent: </b>Monday, August 30, 2021 10:07 AM<br>
<b>To: </b><a href="mailto:x3d-public@web3d.org">X3D-Public</a><br>
<b>Cc: </b><a href="mailto:brutzman@nps.edu">Brutzman, Donald (Don) (CIV)</a>; <a href="mailto:npolys@vt.edu">
Nicholas Polys</a>; <a href="mailto:puk@igraphics.com">Richard F. Puk</a><br>
<b>Subject: </b>Re: [x3d-public] Spec problem with 3D texture axes: wrong-handed coordinate system</p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="line-height:12.0pt;background:#004679"><span style="font-size:10.0pt;color:yellow">NPS WARNING: *external sender* verify before acting.<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Dick <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">At this time I am about 66% confident that the figure I sent on Aug 27 is correct.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- for the figure, as in the original, ignore the 2 cross sections on the left that have no relevance to handedness.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The original figure, with it's assignment of coordinates (1 0 0) as a point on the S axis, and (0 1 0) as a point on the T axis ; and the text<o:p></o:p></p>
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<p class="MsoNormal">which considers (s t r ) as being a coordinate tuple, it appears the intent is the S T R can be considered renaming of X Y Z axes:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">X --> S<o:p></o:p></p>
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<p class="MsoNormal">Y --> T<o:p></o:p></p>
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<p class="MsoNormal">Z --> R<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">If I cross out the S T R labels from the figure , and scribble in X Y Z accordingly, the figure I drew appears right handed.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Another way to "look" : If S T R is intended to be a right-handed system. then , by cyclic rearrangement of axes, so is T-R-S and viewed in this order, the figure I submitted (still) looks right-handed.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Vince<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Aug 30, 2021, at 12:09 PM, <<a href="mailto:puk@igraphics.com">puk@igraphics.com</a>> <<a href="mailto:puk@igraphics.com">puk@igraphics.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi –<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">It still look left-handed to me :^( I suggest exchanging the S and T labels and coordinates leaving the R label and coordinates where they are.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Dick<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">/******************************************<o:p></o:p></p>
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<p class="MsoNormal">| Richard F. Puk, Ph.D., President<o:p></o:p></p>
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<p class="MsoNormal">| Intelligraphics Incorporated<o:p></o:p></p>
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<p class="MsoNormal">| 7644 Cortina Court<o:p></o:p></p>
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<p class="MsoNormal">| Carlsbad, CA 92009-8206<o:p></o:p></p>
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<p class="MsoNormal">| Tel: +1-760-753-9027 Mobile: +1-760-809-9027<o:p></o:p></p>
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<p class="MsoNormal">| Email: <span class="apple-converted-space"> </span><a href="mailto:puk@igraphics.com"><span style="color:#0563C1">puk@igraphics.com</span></a><o:p></o:p></p>
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<p class="MsoNormal">\******************************************<span class="apple-converted-space"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b><span class="apple-converted-space"> </span>Brutzman, Donald (Don) (CIV) <<a href="mailto:brutzman@nps.edu"><span style="color:#954F72">brutzman@nps.edu</span></a>><span class="apple-converted-space"> </span><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Sunday, August 29, 2021 11:50 PM<br>
<b>To:</b><span class="apple-converted-space"> </span><a href="mailto:vmarchetti@kshell.com"><span style="color:#954F72">vmarchetti@kshell.com</span></a>; Richard F. Puk <<a href="mailto:puk@igraphics.com"><span style="color:#954F72">puk@igraphics.com</span></a>>;
'Nicholas Polys' <<a href="mailto:npolys@vt.edu"><span style="color:#954F72">npolys@vt.edu</span></a>><br>
<b>Cc:</b><span class="apple-converted-space"> </span>John Carlson <<a href="mailto:x3d-public@web3d.org"><span style="color:#954F72">x3d-public@web3d.org</span></a>><br>
<b>Subject:</b><span class="apple-converted-space"> </span>RE: [x3d-public] Spec problem with 3D texture axes: wrong-handed coordinate system<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Looks outstanding to me, we will review. Thanks Vince.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">p.s. if you created an X3D model to produce this, am happy to check it into version control We have a section in the X3D archives for specification figures.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">all the best, Don<br>
<span style="font-family:"Courier New"">--<span class="apple-converted-space"> </span><br>
Don Brutzman Naval Postgraduate School, Code USW/Br <span class="apple-converted-space"> </span><a href="mailto:brutzman@nps.edu"><span style="color:#954F72">brutzman@nps.edu</span></a><br>
Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149<br>
X3D graphics, virtual worlds, navy robotics<span class="apple-converted-space"> </span></span><a href="http://faculty.nps.edu/brutzman"><span style="font-family:"Courier New";color:#954F72">http://faculty.nps.edu/brutzman</span></a><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b>From:<span class="apple-converted-space"> </span></b><a href="mailto:vmarchetti@kshell.com"><span style="color:#954F72">vmarchetti@kshell.com</span></a><br>
<b>Sent:<span class="apple-converted-space"> </span></b>Saturday, August 28, 2021 8:04 AM<br>
<b>To:<span class="apple-converted-space"> </span></b><a href="mailto:x3d-public@web3d.org"><span style="color:#954F72">X3D-Public</span></a><br>
<b>Subject:<span class="apple-converted-space"> </span></b>Re: [x3d-public] Spec problem with 3D texture axes: wrong-handed coordinate system<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Attached is a revised Figure 33.1 for the X3D V4 specification under review.<o:p></o:p></p>
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<p class="MsoNormal">This version of the figure was corrected to accurately match the description of the R S T coordinate axes as described in Sections 33.2.2 and 33.2.3 of <a href="https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/texture3D.html#f-3DTexture"><span style="color:#954F72">https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/texture3D.html</span></a><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Vince Marchetti<o:p></o:p></p>
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<p class="MsoNormal"><image001.png><o:p></o:p></p>
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<p class="MsoNormal">On Aug 27, 2021, at 9:58 PM,<span class="apple-converted-space"> </span><a href="mailto:vmarchetti@kshell.com"><span style="color:#954F72">vmarchetti@kshell.com</span></a><span class="apple-converted-space"> </span>wrote:<o:p></o:p></p>
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<p class="MsoNormal">Upon evaluation, this figure attached to the Aug 27 email is inconsistent with the specification text Section 33.2.3<o:p></o:p></p>
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<p class="MsoNormal">A corrected figure is forthcoming.<o:p></o:p></p>
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<p class="MsoNormal">Vince Marchetti<o:p></o:p></p>
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<p class="MsoNormal">On Aug 27, 2021, at 3:54 PM,<span class="apple-converted-space"> </span><a href="mailto:vmarchetti@kshell.com"><span style="color:#954F72">vmarchetti@kshell.com</span></a><span class="apple-converted-space"> </span>wrote:<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Please evaluate whether attached figure meets needs of X3DV4 specification document<o:p></o:p></p>
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<p class="MsoNormal">SVG (via Inkscape) format available upon request<o:p></o:p></p>
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<p class="MsoNormal">Vince Marchetti<o:p></o:p></p>
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<p class="MsoNormal"><x3dV4_Fig33_1.png><o:p></o:p></p>
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<p class="MsoNormal">On Aug 27, 2021, at 1:47 PM, Brutzman, Donald (Don) (CIV) <<a href="mailto:brutzman@nps.edu"><span style="color:#954F72">brutzman@nps.edu</span></a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">As noted in Mantis 978,<span class="apple-converted-space"> </span><a href="https://www.web3d.org/member-only/mantis/view.php?id=978"><span style="color:#954F72">https://www.web3d.org/member-only/mantis/view.php?id=978</span></a><o:p></o:p></p>
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<p class="MsoNormal">The following figure shows a left-handed coordinate system.<o:p></o:p></p>
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<p class="MsoNormal"><a href="https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/texture3D.html#f-3DTexture"><span style="color:#954F72">https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/texture3D.html#f-3DTexture</span></a><o:p></o:p></p>
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<p class="MsoNormal"><54CB4E59BAA24518B7648236A2468E3C.png><o:p></o:p></p>
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<p class="MsoNormal">Wondering how to fix – swap 2 axes can work. Perhaps there is a commonly used diagram in OpenGL (or elsewhere) we might adopt and adapt?<o:p></o:p></p>
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<p class="MsoNormal">Any volunteers to do this (pretty please) to improve X3D4 specification?<o:p></o:p></p>
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<p class="MsoNormal">all the best, Don<br>
<span style="font-family:"Courier New"">--<span class="apple-converted-space"> </span><br>
Don Brutzman Naval Postgraduate School, Code USW/Br <span class="apple-converted-space"> </span></span><a href="mailto:brutzman@nps.edu"><span style="font-family:"Courier New";color:#954F72">brutzman@nps.edu</span></a><span style="font-family:"Courier New""><br>
Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149<br>
X3D graphics, virtual worlds, navy robotics<span class="apple-converted-space"> </span></span><a href="http://faculty.nps.edu/brutzman"><span style="font-family:"Courier New";color:#954F72">http://faculty.nps.edu/brutzman</span></a><o:p></o:p></p>
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