[NeXus-committee] coordinate geometry. mcstas and vitesse for NeXus

[HAUSER, Nick]

Dear NeXus committee,

I can't find explicitly on the nexusformat.org site that mcstas geometry has
been adopted. 
There was the discussion http://www.nexusformat.org/Detector_Geometry and a
proposal, which has been adopted, but not documented. 

A 'mcstas-like' geometry is implicit in Nxdetector, Nxcollimator, Nxbeamstop
etc. They have x and y tags. 
The reason I think it is 'mcstas-like' is that it is relative to the
preceding component, and not global.

I propose that mcstas geometry is made explicit at
http://www.nexusformat.org/Design , including the SNS coordinate geometry
diagram. 
There exists an explanation in http://www.nexusformat.org/NXtranslation
under distances, which could be used. 

Regards,

Nick.


Nick Hauser
Bragg Institute, Building 82
Australian Nuclear Science and Technology Organisation 
PMB 1, Menai NSW 2234
AUSTRALIA

T +61 2 9717 9474 
F +61 2 9717 7799
M 0417 418 542
E nick.hauser at ansto.gov.au    
www.ansto.gov.au/ansto/bragg

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