[x3d-public] Typo in spec ?

[Joe D Williams]

> " SFVec4d's and MFVec4d's are represented as a 4-tuple (components
x, y, z, w) of double-precision floating point values ..."

Several places better descriptions like you suggest would help when 
relating to SAI interfaces and variables.
Thanks,
Joe


----- Original Message ----- 
From: "Roy Walmsley" <roy.walmsley at ntlworld.com>
To: "'Richard F. Puk'" <puk at igraphics.com>; "'Andreas Plesch'" 
<andreasplesch at gmail.com>
Cc: "'X3D Graphics public mailing list'" <x3d-public at web3d.org>
Sent: Tuesday, September 29, 2015 2:24 AM
Subject: Re: [x3d-public] Typo in spec ?


> Hi Andreas and Dick,
>
> I can see that it could be confusing referring to an SFVec4d as a 3D
> homogeneous vector. However, technically, this is the correct 
> description,
> the term 'homogeneous' implying the extra dimension to the standard 
> three
> dimensional vector. And the remainder of the paragraph points out 
> that "
> SFVec4d's and MFVec4d's are represented as a 4-tuple of 
> double-precision
> floating point values ...", thus clarifying the definition. The 
> final
> paragraph gives the default value with the 4-tuple.
>
> The text quoted above could be expanded to incorporate the 
> components, thus
> reading, " SFVec4d's and MFVec4d's are represented as a 4-tuple 
> (components
> x, y, z, w) of double-precision floating point values ...". The 
> danger in
> doing this is that it might imply a definition of the component 
> names. And
> it is inconsistent with  other definitions. So I am inclined not to 
> support
> such a change.
>
> Comments are welcomed. I just offered the idea for consensus 
> building.
>
> Regards,
>
> Roy
>
> -----Original Message-----
> From: x3d-public [mailto:x3d-public-bounces at web3d.org] On Behalf Of 
> Richard
> F. Puk
> Sent: 29 September 2015 05:16
> To: 'Andreas Plesch'; 'X3D Graphics public mailing list'
> Subject: Re: [x3d-public] Typo in spec ?
>
> Hi, Andreas --
>
> A 3D homogeneous vector consists of four components: x, y, z, w.
>
>  -- Dick
>
> /******************************************
> | Richard F. Puk, Ph.D., President
> | Intelligraphics Incorporated
> | 7644 Cortina Court
> | Carlsbad, CA  92009-8206
> | Tel: +1-760-753-9027  Mobile:  +1-760-809-9027
> | Email:  puk at igraphics.com
> \******************************************
>
>
>
>
> -----Original Message-----
> From: x3d-public [mailto:x3d-public-bounces at web3d.org] On Behalf Of 
> Andreas
> Plesch
> Sent: Monday, September 28, 2015 5:45 PM
> To: X3D Graphics public mailing list
> Subject: [x3d-public] Typo in spec ?
>
> http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/fieldsDef.
> html#SFVec4dAndMFVec4d
> has
> " The SFVec4d field or event specifies a three-dimensional (3D) 
> homogeneous
> vector."
> as a first sentence.
>
> Should this instead say " The SFVec4d field or event specifies a
> four-dimensional (4D) homogeneous vector." ?
>
> Andreas
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