NXcylindrical_geometry¶
Status:
base class, extends NXobject
Description:
Geometry description for cylindrical shapes. This class can be used in place of
NXoff_geometrywhen an exact representation for cylinders is preferred. For example, for Helium-tube, neutron detectors. It can be used to describe the shape of any beamline component, including detectors. In the case of detectors it can be used to define the shape of a single pixel, or, if the pixel shapes are non-uniform, to describe the shape of the whole detector.
Symbols:
These symbols will be used below.
i: number of vertices required to define all cylinders in the shape
j: number of cylinders in the shape
k: number cylinders which are detectors
- Groups cited:
none
Structure:
@default: (optional) NX_CHAR
Declares which child group contains a path leading to a NXdata group.
It is recommended (as of NIAC2014) to use this attribute to help define the path to the default dataset to be plotted. See https://www.nexusformat.org/2014_How_to_find_default_data.html for a summary of the discussion.
vertices[i, 3]: (optional) NX_NUMBER {units=NX_LENGTH}
List of x,y,z coordinates for vertices. The origin of the coordinates is the position of the parent component, for example the NXdetector which the geometry describes. If the shape describes a single pixel for a detector with uniform pixel shape then the origin is the position of each pixel as described by the
x/y/z_pixel_offsetdatasets inNXdetector.cylinders[j, 3]: (optional) NX_INT
List of indices of vertices in the
verticesdataset to form each cylinder. Each cylinder is described by three vertices A, B, C. First vertex A lies on the cylinder axis and circular face, second point B on edge of the same face as A, and third point C at the other face and on axis.detector_number[k]: (optional) NX_INT
Maps cylinders in
cylinder, by index, with a detector id.
Hypertext Anchors¶
Table of hypertext anchors for all groups, fields, attributes, and links defined in this class.
documentation (reST source) anchor |
web page (HTML) anchor |
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