[x3d-public] SFRotation default value spec. inconsistency

[Joe D Williams]

not zerp,  zero
-----Original Message-----
From: Extensible 3D (X3D) Graphics public discussion <x3d-public at web3d.org>
Sent: Feb 10, 2025 9:50 AM
To: Extensible 3D (X3D) Graphics public discussion <x3d-public at web3d.org>, X3D Graphics public mailing list <x3d-public at web3d.org>
Cc: Joe D Williams <joedwil at earthlink.net>, Andreas Plesch <andreasplesch at gmail.com>
Subject: Re: [x3d-public] SFRotation default value spec. inconsistency

I think the 0 0 1 0 should be used everywhere for default axis-angle. 
I thinkI see 'zerp' unit quaternions (as in gltf as 0 0 0 1  XYZW) 
Thanks,
Joe


-----Original Message-----
From: Extensible 3D (X3D) Graphics public discussion <x3d-public at web3d.org>
Sent: Feb 10, 2025 8:44 AM
To: X3D Graphics public mailing list <x3d-public at web3d.org>
Cc: Andreas Plesch <andreasplesch at gmail.com>
Subject: Re: [x3d-public] SFRotation default value spec. inconsistency

The JS SAI spec. at https://www.web3d.org/documents/specifications/19777-1/V3.3/Part1/functions.html#FieldServices
 
does not list functions for SFColorRGBA, only SFColor. There may be an earlier report. -Andreas


On Mon, Feb 10, 2025 at 11:31 AM Andreas Plesch <andreasplesch at gmail.com (mailto:andreasplesch at gmail.com)> wrote:
https://www.web3d.org/documents/specifications/19775-1/V4.0/Part01/fieldTypes.html#SFRotationAndMFRotation
 
specifies that (0 0 1 0) is the value of an uninitialized SFRotation given as (x y z a).
 
However, the JS SAI spec. in table 7.18 in https://www.web3d.org/documents/specifications/19777-1/V3.3/Part1/functions.html#SFRotationInstanceCreationFunction
 
effectively makes (0 1 0 0) the default value if no parameters are provided.
 
The inconsistency does not have much of an impact since both are 0 rotations but I believe (0 1 0 0) - a 0 rotation around y - may have been intended as the default.
 
-Andreas
 
-- 
Andreas Plesch
Waltham, MA 02453




 

-- 
Andreas Plesch
Waltham, MA 02453






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