<div dir="ltr">For example I submitted a geoConvert node concept to specs comment. That was for routing between different geo coordinate systems. I suppose there could be an Euler or RotationConverter node idea, that triggers an event on load, and the user could give euler angles in degrees and route axis angles to a transform rotation field.<div>-Doug</div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Jan 7, 2019 at 6:45 AM GPU Group <<a href="mailto:gpugroup@gmail.com">gpugroup@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">And this is a tough crowd AJ - they rake you over the coals here. No instant applause allowed. I've submitted a few ideas through the specs comments and very little saw its way into specs v4. Personally I love the euler idea - in large part because I think it would welcome more users from different backgrounds and skill levels, trying to get started in x3d.<div>I suspect to get things adopted, its better to become a full member, and sit on various 'boards' where we can nurse our pet ideas through to final specs. I would do that process but I always seem to have my year booked. Maybe some day.</div><div>-Doug Sanden</div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Jan 7, 2019 at 4:39 AM Albert Jan Wonnink <<a href="mailto:awonnink@hotmail.com" target="_blank">awonnink@hotmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<div style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:12pt">
Hi Joseph,</div>
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<br>
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Thank you for your reply. Just to be sure: the context I meant to discuss is about having a convenient attribute in the declarative syntax, say 'euler', to set the initial orientation of the transform, so anyone can use either 'rotation' or 'euler'.</div>
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</div>
<div style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:12pt">
<transform euler="20 40 10" ></div>
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<br>
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<div style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:12pt">
So I interpreted Vince's $yaw, $pitch and $roll to be just placeholders, for manual substitution. </div>
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You are right using this with either radians or degrees would be equally simple. </div>
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Regards,</div>
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<br>
</div>
<div style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:12pt">
Albert Jan </div>
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</p>
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<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt;border:none;padding:0in">
<b>From: </b><a href="mailto:joedwil@earthlink.net" target="_blank">Joseph D Williams</a><br>
<b>Sent: </b>Sunday, January 6, 2019 7:20 PM<br>
<b>To: </b><a href="mailto:awonnink@hotmail.com" target="_blank">Albert Jan Wonnink</a>; <a href="mailto:vmarchetti@kshell.com" target="_blank">
vmarchetti@kshell.com</a>; <a href="mailto:x3d-public@web3d.org" target="_blank">X3D-Public</a><br>
<b>Subject: </b>Re: [x3d-public] Euler rotation</p>
</div>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
Hi Albert and All, </p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
When you use euler (or <span style="font-size:12pt;color:black">Tait-Bryan) </span>
angles for a while you will find that you get problems. </p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
Actually there is plenty of writing about the details maybe even in the x3d or hanim archives and widely on the web.</p>
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</p>
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In addition, when you create or edit the things much then you will find it is actually a lot easier to use quats or axis-angle radians. In general, for degrees, maybe your editing system may offer as a learning tool if radian is really an elementary block to
learning, but really, never in the user code due to misleading simplicity and what ‘cha finally gonna tell ‘em when the gimbals lock?
</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
</p>
<ul type="disc" style="margin-bottom:0in;margin-top:0in">
<li class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoListParagraph" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
<Transform DEF="yaw-rotation" rotation="0 0 1 $yaw"></li><li class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoListParagraph" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
<Transform DEF="pitch-rotation" rotation="0 1 0 $pitch"></li><li class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoListParagraph" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
<Transform DEF="roll-rotation" rotation="1 0 0 $roll"></li></ul>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
Besides the fact that a variable is not allowed there </p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
(maybe use a prototype if you need a variable?) </p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
I don't think your naming of yaw and pitch and roll is reasonable for x3d. </p>
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</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
For default transform rotation 0 0 1 0, sit on it and face +z and find +y is up and +x is left.
</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
then fly the thing using pitch and yaw and roll.</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
The x3d axis-angle parameters are most likely pitch yaw roll then the scale, </p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
and I think the same order for quaternions, except where the 'scale' is placed and the special limits for values.
</p>
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</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
Why not try the following:</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
DEF Pitch OrientationInterpolator { </p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
key [ 0, 0.25 0.5, 0.75 1 ] </p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
keyValue [ 0 0 1 0, 1 0 0 1.5, 0 0 1 0, -1 0 0 1.5, 0 0 1 0 ] }</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
DEF Yaw OrientationInterpolator { key [ 0, 0.25 0.5, 0.75 1 ] </p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
keyValue [ 0 0 1 0, 0 1 0 1.5, 0 0 1 0, 0 -1 0 1.5, 0 0 1 0 ] }</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
DEF Roll OrientationInterpolator { </p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
key [ 0, 0.25 0.5, 0.75 1 ] </p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
keyValue [ 0 0 1 0, 0 0 1 1.5, 0 0 1 0, 0 0 1 1.5, 0 0 1 0 ] }</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
</p>
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Thanks and Best,</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
Joe</p>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
</p>
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<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
<b>From: </b><a href="mailto:awonnink@hotmail.com" target="_blank">Albert Jan Wonnink</a><br>
<b>Sent: </b>Sunday, January 6, 2019 2:25 PM<br>
<b>To: </b><a href="mailto:vmarchetti@kshell.com" target="_blank">vmarchetti@kshell.com</a>; <a href="mailto:x3d-public@web3d.org" target="_blank">
X3D-Public</a><br>
<b>Subject: </b>Re: [x3d-public] Euler rotation</p>
</div>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
</p>
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<span style="font-size:12pt;color:black">Thanks Vince, for your reply. </span></p>
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<span style="font-size:12pt;color:black"> </span></p>
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<span style="font-size:12pt;color:black">As long as the angles and X3D code is generated by code one can of course easily calculate the individual parameters for a quaternion. But during the testing of our experimental Unity based browser, and preparing
scenes for that, I found it very easy to extend the transform specification with a degree-based Euler attribute (Tait-Bryan would also have worked).</span></p>
</div>
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<span style="font-size:12pt;color:black"> </span></p>
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<span style="font-size:12pt;color:black">The current system still makes it relatively difficult to manually apply an angle of the most used fractions of PI, doesn't it?</span></p>
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<span style="font-size:12pt;color:black"> </span></p>
</div>
<div>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
<span style="font-size:12pt;color:black">I guess this issue must have been discussed in one of the early days of the X3D specification. But it seems to me a lost chance to make it more convenient.</span></p>
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<span style="font-size:12pt;color:black"> </span></p>
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<span style="font-size:12pt;color:black">Regards</span></p>
</div>
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<span style="font-size:12pt;color:black"> </span></p>
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<span style="font-size:12pt;color:black"> </span></p>
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<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
<span style="font-size:12pt;color:black">Albert Jan Wonnink</span></p>
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<span style="font-size:12pt;color:black"> </span></p>
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<span style="font-size:12pt;color:black"> </span></p>
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<img width="562" height="2" id="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_Horizontal_x0020_Line_x0020_1" style="width: 5.8541in; height: 0.0208in;" alt="cid:image002.png@01D4A5E3.FD08F950" border="0" src="cid:1682887d29066dc2d331"></p>
<div id="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_divRplyFwdMsg">
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
<b><span style="color:black">Van:</span></b><span style="color:black"> <a href="mailto:vmarchetti@kshell.com" target="_blank">vmarchetti@kshell.com</a> <<a href="mailto:vmarchetti@kshell.com" target="_blank">vmarchetti@kshell.com</a>><br>
<b>Verzonden:</b> zondag 6 januari 2019 22:49<br>
<b>Aan:</b> Albert Jan Wonnink; X3D-Public<br>
<b>Onderwerp:</b> Re: [x3d-public] Euler rotation</span> </p>
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There is no single node Euler angle alternative representation of a rotation transform defined in the current (v 3.3) X3D standard.</p>
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</p>
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<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
You can get an easier to edit representation of Euler angle rotation (specifically the Tait-Bryan angles, <a href="https://en.wikipedia.org/wiki/Euler_angles#Tait–Bryan_angles" target="_blank">https://en.wikipedia.org/wiki/Euler_angles#Tait%E2%80%93Bryan_angles</a>, commonly
used for vehicle oriented</p>
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<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
with respect to the horizon, by nesting 3 Transforms:</p>
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</p>
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<div>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
<Transform DEF="yaw-rotation" rotation="0 0 1 $yaw"></p>
</div>
<div>
<p class="gmail-m_4087853144415287166gmail-m_-5566622434455770842x_MsoNormal" style="margin:0in 0in 0pt;font-family:Calibri,sans-serif;font-size:11pt">
<Transform DEF="pitch-rotation" rotation="0 1 0 $pitch"></p>
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<Transform DEF="roll-rotation" rotation="1 0 0 $roll"></p>
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<!-- put vehicle model here --></p>
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<Shape>...</Shape></p>
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</Transform></p>
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</Transform></p>
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where for $yaw, $pitch, $roll you need to substitute the numerical value of the rotation angle in radians.</p>
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Vince Marchetti</p>
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<blockquote style="margin-top:5pt;margin-bottom:5pt">
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On Jan 6, 2019, at 12:53 PM, Albert Jan Wonnink <<a href="mailto:awonnink@hotmail.com" target="_blank">awonnink@hotmail.com</a>> wrote:</p>
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<span style="font-size:12pt">Is there, or should there be, an Euler alternative for the transform 'rotation' property? This makes direct x3d code editing much easier.</span></p>
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<span style="font-size:12pt"> </span></p>
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<span style="font-size:12pt">Regards,</span></p>
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<span style="font-size:12pt"> </span></p>
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<span style="font-size:12pt"> </span></p>
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<span style="font-size:12pt">Albert Jan Wonnink </span></p>
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