[Nexus] NXgeometry lacking documentation and others....

[Wintersberger, Eugen]

Hi, 
 I agree with Mark. NXaperture needs definitely some refurbishing. 
Besides the top, bottom, left, right positions I would suggest to
introduce something like 

x_gap
x_offset
y_gap
y_offset

where the x- and y-direction coincide with the Nexus coordinate frame
convention. The z-axis is given by the beam passing the aperture. 

regards
   Eugen

PS: if you do not mind I will use this convention for my Nexus files
right now to check whether or not this is convenient.  


On Tue, 2012-11-20 at 08:24 +0100, Mark Koennecke wrote:
> Hi,
> 
> On 11/19/2012 10:45 PM, Pete Jemian wrote:
> > Very likely the case then, that NXgeometry is overused.
> > Anyone want to take on the task of reviewing and offering revisions?
> >
> well, my suggestion would be a different one:
> - mark NXgeometry as deprecated in favour of the CIF scheme
> - Revise NXaperture to better cover the common usage case of a 
> rectangular slit with fields:
> 
>      * bottom, top, left, right being the actual motors driven
>      * width and height as derived values commonly asked for
>      * distance, x_ and y_translation to position  the whole beast
> - Consider an NXcylindrical_aperture with fields diameter and length to 
> cover photographic aperture
>    like round slits. Rather then  another class we could also have a 
> type filed in NXaperture which indicates the
>    type of slits.
> 
> I am aware that his needs proper discussion and may not be sortable 
> before a next meeting of the NIAC.
> Lets try the Telco next.
> 
> Regards,
> 
>            Mark
> 
> 
> > On 11/19/2012 10:17 AM, Ray Osborn wrote:
> >> This is now old history, but my vote would have been that we store 
> >> certain parameters in common use, according to their common usage 
> >> (with documentation), and keep NXgeometry only for cases where we are 
> >> physically describing the object as it would appear in a CAD drawing. 
> >> I am guessing that is not how it is used in a lot of the NXDL files.
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