[NeXus-committee] A very stupid question

[Herbert J. Bernstein]

Dear Eugen,

  More often the origin of the overall coordinate frame is in the sample,
not the detector, and even for the local coordinate frame of the detector
face, the origin is usually at one of the corners, not the beam center.
Which corner is another issue.  We still have cases where we have to guess
and just try all 4 corners until we discover which one had actually been
used.

  Regards,
    Herbert

On Fri, Jul 28, 2017 at 8:54 AM, Eugen Wintersberger <
eugen.wintersberger at desy.de> wrote:

> Hi folks,
>   I know this sounds rather stupid but: am I right if I assume that the
> beam center (the location where the
> primary beam hits the detector) is the origin of the detectors local
> coordinate frame?
>
> Background: I am actually cleaning up my DESY internal Nexus documents
> including use cases for
> NXtransformation and NXdetector (for different detector configurations)
> and while doing this I realized that I am not
> sure about the definition of the origin of the detector local coordinate
> frame.
> I already  have some nice results using NXtransformation for q-space
> conversion and maybe we could use
> these documents, once they are finished, as cookbooks for Nexus users.
>
> regards
>   Eugen
> --
> Dr. Eugen Wintersberger
>
> FS-EC
> DESY
> Notkestr. 85
> D-22607 Hamburg
> Germany
>
>
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