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<span>Hi Doug,</span></div>
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<span>thank you for your answer. I am admiring the work that is being done by the current working groups and it seems almost like an impossible job to get 'global' consensus about thus many parts of a specification.</span></div>
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<span>In the mean time the rate of development increases exponentially, so it will probably be more and more difficult to keep specifications like x3d up with new devices and possibilities for which these are needed.</span></div>
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It is an interesting era.</div>
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Regards</div>
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Albert Jan</div>
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<div id="divRplyFwdMsg" dir="ltr"><font color="#000000" face="Calibri, sans-serif" style="font-size:11pt"><b>Van:</b> x3d-public <x3d-public-bounces@web3d.org> namens x3d-public-request@web3d.org <x3d-public-request@web3d.org><br>
<b>Verzonden:</b> maandag 7 januari 2019 14:46<br>
<b>Aan:</b> x3d-public@web3d.org<br>
<b>Onderwerp:</b> x3d-public Digest, Vol 118, Issue 16</font>
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Today's Topics:<br>
<br>
1. Re: Euler rotation (GPU Group)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Mon, 7 Jan 2019 06:45:14 -0700<br>
From: GPU Group <gpugroup@gmail.com><br>
To: X3D-Public <x3d-public@web3d.org><br>
Subject: Re: [x3d-public] Euler rotation<br>
Message-ID:<br>
<CAM2ogRdpwmnOVDxsWXzq-ihszCUWKcs26BWfvCa6skBJtThyNQ@mail.gmail.com><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
And this is a tough crowd AJ - they rake you over the coals here. No<br>
instant applause allowed. I've submitted a few ideas through the specs<br>
comments and very little saw its way into specs v4. Personally I love the<br>
euler idea - in large part because I think it would welcome more users from<br>
different backgrounds and skill levels, trying to get started in x3d.<br>
I suspect to get things adopted, its better to become a full member, and<br>
sit on various 'boards' where we can nurse our pet ideas through to final<br>
specs. I would do that process but I always seem to have my year booked.<br>
Maybe some day.<br>
-Doug Sanden<br>
<br>
On Mon, Jan 7, 2019 at 4:39 AM Albert Jan Wonnink <awonnink@hotmail.com><br>
wrote:<br>
<br>
> Hi Joseph,<br>
><br>
> Thank you for your reply. Just to be sure: the context I meant to discuss<br>
> is about having a convenient attribute in the declarative syntax, say<br>
> 'euler', to set the initial orientation of the transform, so anyone can use<br>
> either 'rotation' or 'euler'.<br>
><br>
> <transform euler="20 40 10" ><br>
><br>
> So I interpreted Vince's $yaw, $pitch and $roll to be just placeholders,<br>
> for manual substitution.<br>
><br>
> You are right using this with either radians or degrees would be equally<br>
> simple.<br>
><br>
> Regards,<br>
><br>
> Albert Jan<br>
><br>
><br>
><br>
><br>
><br>
> *From: *Joseph D Williams <joedwil@earthlink.net><br>
> *Sent: *Sunday, January 6, 2019 7:20 PM<br>
> *To: *Albert Jan Wonnink <awonnink@hotmail.com>; vmarchetti@kshell.com;<br>
> X3D-Public <x3d-public@web3d.org><br>
> *Subject: *Re: [x3d-public] Euler rotation<br>
><br>
><br>
><br>
> Hi Albert and All,<br>
><br>
> When you use euler (or Tait-Bryan) angles for a while you will find that<br>
> you get problems.<br>
><br>
> Actually there is plenty of writing about the details maybe even in the<br>
> x3d or hanim archives and widely on the web.<br>
><br>
><br>
><br>
> In addition, when you create or edit the things much then you will find it<br>
> is actually a lot easier to use quats or axis-angle radians. In general,<br>
> for degrees, maybe your editing system may offer as a learning tool if<br>
> radian is really an elementary block to learning, but really, never in the<br>
> user code due to misleading simplicity and what ?cha finally gonna tell ?em<br>
> when the gimbals lock?<br>
><br>
><br>
><br>
> - <Transform DEF="yaw-rotation" rotation="0 0 1 $yaw"><br>
> - <Transform DEF="pitch-rotation" rotation="0 1 0 $pitch"><br>
> - <Transform DEF="roll-rotation" rotation="1 0 0 $roll"><br>
><br>
><br>
><br>
> Besides the fact that a variable is not allowed there<br>
><br>
> (maybe use a prototype if you need a variable?)<br>
><br>
> I don't think your naming of yaw and pitch and roll is reasonable for x3d.<br>
><br>
><br>
><br>
> For default transform rotation 0 0 1 0, sit on it and face +z and find +y<br>
> is up and +x is left.<br>
><br>
> then fly the thing using pitch and yaw and roll.<br>
><br>
> The x3d axis-angle parameters are most likely pitch yaw roll then the<br>
> scale,<br>
><br>
> and I think the same order for quaternions, except where the 'scale' is<br>
> placed and the special limits for values.<br>
><br>
><br>
><br>
> Why not try the following:<br>
><br>
><br>
><br>
> DEF Pitch OrientationInterpolator {<br>
><br>
> key [ 0, 0.25 0.5, 0.75 1 ]<br>
><br>
> keyValue [ 0 0 1 0, 1 0 0 1.5, 0 0 1 0, -1 0 0 1.5, 0 0 1 0 ] }<br>
><br>
><br>
><br>
> DEF Yaw OrientationInterpolator { key [ 0, 0.25 0.5, 0.75 1 ]<br>
><br>
> keyValue [ 0 0 1 0, 0 1 0 1.5, 0 0 1 0, 0 -1 0 1.5, 0 0 1 0 ] }<br>
><br>
><br>
><br>
> DEF Roll OrientationInterpolator {<br>
><br>
> key [ 0, 0.25 0.5, 0.75 1 ]<br>
><br>
> keyValue [ 0 0 1 0, 0 0 1 1.5, 0 0 1 0, 0 0 1 1.5, 0 0 1 0 ] }<br>
><br>
><br>
><br>
> Thanks and Best,<br>
><br>
> Joe<br>
><br>
><br>
><br>
> *From: *Albert Jan Wonnink <awonnink@hotmail.com><br>
> *Sent: *Sunday, January 6, 2019 2:25 PM<br>
> *To: *vmarchetti@kshell.com; X3D-Public <x3d-public@web3d.org><br>
> *Subject: *Re: [x3d-public] Euler rotation<br>
><br>
><br>
><br>
> Thanks Vince, for your reply.<br>
><br>
><br>
><br>
> As long as the angles and X3D code is generated by code one can of course<br>
> easily calculate the individual parameters for a quaternion. But during the<br>
> testing of our experimental Unity based browser, and preparing scenes for<br>
> that, I found it very easy to extend the transform specification with a<br>
> degree-based Euler attribute (Tait-Bryan would also have worked).<br>
><br>
><br>
><br>
> The current system still makes it relatively difficult to manually apply<br>
> an angle of the most used fractions of PI, doesn't it?<br>
><br>
><br>
><br>
> I guess this issue must have been discussed in one of the early days of<br>
> the X3D specification. But it seems to me a lost chance to make it more<br>
> convenient.<br>
><br>
><br>
><br>
> Regards<br>
><br>
><br>
><br>
><br>
><br>
> Albert Jan Wonnink<br>
><br>
><br>
><br>
><br>
><br>
> [image: cid:image002.png@01D4A5E3.FD08F950]<br>
><br>
> *Van:* vmarchetti@kshell.com <vmarchetti@kshell.com><br>
> *Verzonden:* zondag 6 januari 2019 22:49<br>
> *Aan:* Albert Jan Wonnink; X3D-Public<br>
> *Onderwerp:* Re: [x3d-public] Euler rotation<br>
><br>
><br>
><br>
> There is no single node Euler angle alternative representation of a<br>
> rotation transform defined in the current (v 3.3) X3D standard.<br>
><br>
><br>
><br>
> You can get an easier to edit representation of Euler angle rotation<br>
> (specifically the Tait-Bryan angles,<br>
> <a href="https://en.wikipedia.org/wiki/Euler_angles#Tait%E2%80%93Bryan_angles">
https://en.wikipedia.org/wiki/Euler_angles#Tait%E2%80%93Bryan_angles</a><br>
> <<a href="https://en.wikipedia.org/wiki/Euler_angles#Tait?Bryan_angles">https://en.wikipedia.org/wiki/Euler_angles#Tait?Bryan_angles</a>>, commonly<br>
> used for vehicle oriented<br>
><br>
> with respect to the horizon, by nesting 3 Transforms:<br>
><br>
><br>
><br>
> <Transform DEF="yaw-rotation" rotation="0 0 1 $yaw"><br>
><br>
> <Transform DEF="pitch-rotation" rotation="0 1 0 $pitch"><br>
><br>
> <Transform DEF="roll-rotation" rotation="1 0 0 $roll"><br>
><br>
> <!-- put vehicle model here --><br>
><br>
> <Shape>...</Shape><br>
><br>
> </Transform><br>
><br>
> </Transform><br>
><br>
> </Transform><br>
><br>
><br>
><br>
> where for $yaw, $pitch, $roll you need to substitute the numerical value<br>
> of the rotation angle in radians.<br>
><br>
><br>
><br>
><br>
><br>
> Vince Marchetti<br>
><br>
><br>
><br>
> On Jan 6, 2019, at 12:53 PM, Albert Jan Wonnink <awonnink@hotmail.com><br>
> wrote:<br>
><br>
><br>
><br>
> Is there, or should there be, an Euler alternative for the transform<br>
> 'rotation' property? This makes direct x3d code editing much easier.<br>
><br>
><br>
><br>
> Regards,<br>
><br>
><br>
><br>
><br>
><br>
> Albert Jan Wonnink<br>
><br>
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