[x3d-public] Euler rotation

[Albert Jan Wonnink]

Thanks Vince, for your reply.

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).

The current system still makes it relatively difficult to manually apply an angle of the most used fractions of PI, doesn't it?

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.

Regards


Albert Jan Wonnink


________________________________
Van: vmarchetti at kshell.com <vmarchetti at kshell.com>
Verzonden: zondag 6 januari 2019 22:49
Aan: Albert Jan Wonnink; X3D-Public
Onderwerp: Re: [x3d-public] Euler rotation

There is no single node Euler angle alternative representation of a rotation transform defined in the current (v 3.3) X3D standard.

You can get an easier to edit representation of Euler angle rotation (specifically the Tait-Bryan angles, https://en.wikipedia.org/wiki/Euler_angles#Tait%E2%80%93Bryan_angles<https://en.wikipedia.org/wiki/Euler_angles#Tait-Bryan_angles>, commonly used for vehicle oriented
with respect to the horizon, by nesting 3 Transforms:

<Transform DEF="yaw-rotation" rotation="0 0 1 $yaw">
<Transform DEF="pitch-rotation" rotation="0 1 0 $pitch">
<Transform DEF="roll-rotation" rotation="1 0 0 $roll">
<!-- put vehicle model here -->
<Shape>...</Shape>
</Transform>
</Transform>
</Transform>

where for $yaw, $pitch, $roll you need to substitute the numerical value of the rotation angle in radians.


Vince Marchetti

On Jan 6, 2019, at 12:53 PM, Albert Jan Wonnink <awonnink at hotmail.com<mailto:awonnink at hotmail.com>> wrote:

Is there, or should there be, an Euler alternative for the transform 'rotation' property? This makes direct x3d code editing much easier.

Regards,


Albert Jan Wonnink
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